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Silva, M. R. O., M. G. Pennino, and P. F. M. Lopes. 2019. Social-ecological trends: managing the vulnerability of coastal fishing communities. Ecology and Society 24(4):4.
https://doi.org/10.5751/ES-11185-240404
Research, part of a special feature on Managing local and global fisheries in the Anthropocene

Social-ecological trends: managing the vulnerability of coastal fishing communities

1Fishing Ecology, Management and Economics Group (FEME), Department of Ecology, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil, 2Statistical Modeling Ecology Group (SMEG), Departament d'Estadística i Investigació Operativa, Universitat de València, Valencia, Spain, 3Instituto Español de Oceanografia (IEO), Centro Oceanográfico de Vigo, Vigo, Pontevedra, Spain

ABSTRACT

The loss of biodiversity, including the collapse of fish stocks, affects the vulnerability of social-ecological systems (SESs) and threatens local livelihoods. Incorporating community-centered indicators and SES drivers and exposures of change into coastal management can help anticipate and mitigate human and/or coastal vulnerability. We have proposed a new index to measure the social-ecological vulnerability of coastal fishing communities (Index of Coastal Vulnerability [ICV]) based on species, ecosystem, and social indicators. The ICV varies from 0 (no vulnerability) to 1 (very high vulnerability) and is composed of 3 components: species vulnerability, i.e., fish biological traits; ecosystem vulnerability, i.e., environmental indicators of ecosystem health; and adaptive capacity, i.e., human ability to cope with changes. We tested the ICV of Brazil’s 17 coastal states. The average ICV for the Brazilian coast was 0.77, and variation was low among states. More than half of the coastal states revealed very high vulnerability (> 0.8). The ecosystem vulnerability values were worse than the adaptive capacity and species vulnerability values, and the North and Northeast regions were revealed to be vulnerable hot spots. Additionally, we investigated how the ICV related to specific anthropogenic risks, i.e., fish landing richness, fishery instability, market, coastal extension, and coastal population, and found that states with fewer species landings and higher coastal populations presented higher ICVs. At a time when human impacts are overtaking natural processes, understanding how these impacts lead to coastal vulnerability can help improve conservation policies. For this case study, we suggest both fisheries management measures and restoration of sensitive habitats to protect species and decrease vulnerability. The integrated evaluation developed here could be used as a baseline for coastal monitoring and conservation planning and be applied to coastal regions in which governments evaluate both social and biological aspects.
Key words: Anthropocene; coupled system; ecosystem services; human ecology; resource dependency

INTRODUCTION

Anthropogenic activities are pushing ecosystems beyond their ability to maintain processes and services that are fundamental to human societies (Ripple et al. 2017, Aswani et al. 2018). Intense consumption of natural resources has threatened and extinguished species and led to the current biodiversity crises (Corlett 2015), thus impacting the provision of ecosystem services (Cardinale et al. 2012). For instance, coral reefs have been rapidly degrading in response to anthropogenic drivers (Hughes et al. 2017), and top predators have become absent or threatened, both at sea and on land (McGill et al. 2015). The current situation of fisheries around the world indicates that the productive capacity of the fish stocks is reaching its limit (Food and Agriculture Organization of the United Nations [FAO] 2016).

Overfishing can cause fluctuations in fish catches (Pomeroy et al. 2016), reduce biodiversity, and affect the provision of marine services (Christensen et al. 2014), which directly threatens food, income, and livelihood security, especially in the developing world (FAO 2012). Depletion of fish stocks also has serious consequences on human livelihoods (Kleisner et al. 2013b, Teh and Sumaila 2013). The sustainability of vital ecosystem services that humans depend on for their livelihoods is crucial to maintaining balanced social-ecological systems (SESs). Although many groups of people in different social-ecological contexts can adapt reasonably well to an environmentally changing world, these adaptations do not necessarily imply better lives. People, such as artisanal fishers for example, who rely heavily on natural resources, have been burdened by multiple changes in the ecosystems, e.g., depletion of fish stocks, that vary according to their own social-ecological context (Berkes et al. 2000, Perry et al. 2010). By knowing how vulnerable a system is and the specific conditions that make it vulnerable, key actions can be developed to minimize the impacts of environmental changes and sustain ecosystem services and livelihoods.

Vulnerability can be defined as the state of susceptibility to damage from multiple stressors (Cinner et al. 2013), or as a condition of a system to cope and adapt to changes caused by these disturbances (Adger 2006, Intergovernmental Panel on Climate Change [IPCC] 2014). Social vulnerability, specifically, can be evaluated through indicators of the factors that influence a community’s ability to sustain itself against changes to the SES (Liu et al. 2007). In addition to environmental fluctuations, these communities are exposed to other changes, such as economic, social, demographic, and governance-related changes (Bennet et al. 2015, Khan and Cundill 2019). Governance, specifically, which is defined as a continuous process of negotiation on how to manage ecosystems, is considered to be a critical element to solving the problems identified in fisheries (Basurto et al. 2017, Bennett et al. 2019) and needs to be adaptable given that changes to SESs are inevitable (Bennett and Satterfield 2018). From an ethics perspective, coastal governance contributes to identifying blind spots that are overlooked in some fishing SESs, such as issues related to gender inequality, property rights, and social actors (Basurto et al. 2017).

Many coastal marine systems and their associated SESs still retain outstanding biological features, but changes are expected to increase their vulnerability, as the Anthropocene continues to unfold (Steffen et al. 2011). In an SES, more exposed groups, such as those made more vulnerable because of their gender, age, class, and/or ethnicity usually feel these changes first (O’Brien et al. 2010). This is true even for groups, such as women, whose contribution to collective action in fisheries is crucial (Di Ciommo and Schiavetti 2012, Alonso-Población and Siar 2018) but who are still subjected to high levels of discrimination (Harper et al. 2013, Siar and Kalikoski 2016). To date, most of the social vulnerability research has focused on the effects of climate change (Dolan and Walker 2004, Cinner et al. 2013). However, vulnerability driven by other factors, such as overfishing, population growth, market fluctuations that impact seafood prices, fisheries technology, infrastructure developments, and governance and policies, should not be disregarded (Bennett et al. 2017).

Given the diverse methods by which fish are caught and the different governance regimes (World Wildlife Fund [WWF] 2016), coastal communities in Brazil serve as an important case study. Although the country has one of the largest coastlines in the world and a huge Exclusive Economic Zone, fish production has declined over the last decades, and some estimates suggest that there are few, if any, unexploited fishing resources that could endure additional harvest (Ruffino and Abdallah 2016). Moreover, the Brazilian coastline has undergone multiple environmental and socioeconomic changes over the last 50 years, which have negatively impacted both fish stocks and local livelihoods (Prates et al. 2012, Reis et al. 2016). Lack of effective governance to promote sustainable fishing in a changing world is an important part of this failure to preserve fish stocks and protect local livelihoods and is possibly the main threat to the Brazilian marine systems (Dias-Neto and Dias 2015, Ruffino and Abdallah 2016).

The need to evaluate the relationships between the social and ecological dimensions of human vulnerability is now urgent (Cinner et al. 2013, Daw et al. 2016) if healthier governance regimes are to be established. It is especially important to consider that changes to SESs occur at different scales and speeds and thus produce different outcomes from one community to the next (IPCC 2014, Bennett et al. 2016). Therefore, it is crucial to understand who and where the vulnerable people and species are, how to reduce their vulnerability, and where the economic consequences of vulnerable fisheries systems will be felt the most.

We used an innovative and integrative approach to explore social-ecological vulnerabilities driven by multiple interacting socioeconomic and ecological changes along the Brazilian coast in fishery-dependent communities. Adopting the perspective that humans and the natural environment constantly interact (Liu et al. 2007, Aswani et al. 2018), we constructed an index of coastal vulnerability that is composed of biological and social-related variables and that considers the interactions between the system, pressures, and threats. We first identified which aspects are important to determining coastal vulnerability and then related the index to ecological, demographic, geographic, and socioeconomic indicators. Second, we investigated two hypotheses to explain the vulnerability of coastal communities: (1) whether lower fish richness in landings and stability of fishing resources were associated with high coastal vulnerability; and (2) whether regions with larger coastal extensions, greater populations, and higher market indexes tend to be more vulnerable. Social-ecological approaches to assessing coastal vulnerabilities can identify where to focus attention to mitigate the anthropogenic impacts and improve the sustainability measures of marine resources to avoid further collapses. As part of the test of our index, we also generated an index that ranked the vulnerability of all the Brazilian states. This additional result could encourage policy makers to improve their state’s index by implementing public and environmental initiatives directed toward conservation and meeting regional needs. Gaining new insights into marine SESs using interdisciplinary modeling approaches will better prepare us to manage marine resources in the Anthropocene.

MATERIAL AND METHODS

A brief review of vulnerability assessments

Marine SESs face different types of stressors at different scales and speeds, such as climatic, socio-cultural, economic, and governance (Millenium Ecosystem Assessment 2005, Bennett et al. 2016). Understanding the systems’ vulnerabilities is an important step to design means for the SESs to deal with such stressors. However, vulnerability is neither easily defined nor measured (Comte et al. 2019). We specifically adopted the definition that vulnerability corresponds to how natural resources, resource users, and the governance systems are linked and respond to changes (Berkes and Folke 1998, Gunderson 2010).

Consideration of different perspectives, scales, indicators, and the interactions between ecological and human dimensions is crucial to capturing changes in the SES. For this reason, we envisioned the SES to be a single and coupled system where social and ecological components interact closely (Marshall et al. 2013, López-Angarita et al. 2014). Additionally, to date most approaches to dealing with coastal vulnerability have considered the ongoing and expected impacts of climate change (Beck 2014, Lee et al. 2018) and overlooked other harmful structural and systemic factors driving vulnerability (Hinkel 2011, Tschakert et al. 2013). To partially avoid this shortcoming, we used overfishing as a crucial environmental factor that is both affected by and affects the environment, food security, and livelihoods and is capable of triggering regime shifts in SESs. We also used various easy-to-collect indicators that encompass assorted social-ecological variables, such as biophysical, social, economic, and governance-related ones, for rapid vulnerability assessments. This is different from most approaches that use a large and/or oversimplified range of indicators (Aswani et al. 2019, Comte et al. 2019).

Finally, given that one of the objectives of conducting vulnerability assessments is to inform policy and decision makers, especially because vulnerability is context specific (O’Brien et al. 2007), we adopted a local-level approach (Hinkel 2011). At the local level, the chances of having enough data on the ecology of species and on the synergism of interactions between humans and the environment are also higher, and, therefore, there is less room for misrepresentation of the system’s vulnerability (Tschakert et al. 2013, Khan and Cundill 2019). Our intention is to determine how to most effectively support and enable local and regional efforts to conserve coastal areas and sustainably manage the provision of fisheries ecosystem services. To emphasize the novelty of the proposed approach, we reviewed and compared the existent vulnerability approaches to ours (Table 1).

Measuring coastal vulnerability

The proposed index, the Index of Coastal Vulnerability (ICV), focuses on the characteristics of fishers, communities, fishing sectors, governance, and ecosystems to estimate their susceptibility to harm (loss or decreased fisheries) at the local level (Fig. 1). This is the level where impacts are mostly felt; therefore, it is the most suited to carry out vulnerability assessments (Hinkel 2011).

We assessed vulnerability by breaking it into three attributes known to affect it: exposure, sensitivity, and adaptive capacity (Adger 2006, Cinner et al. 2013). The combination of exposure and sensitivity represents the potential harm from a given environmental change, and adaptive capacity is determined by the ability to cope with this change through learning (Adger 2006, Bennett et al. 2016). Based on these concepts and the equation proposed by Adger (2006), which includes these three attributes, we created a new equation that simplified the theory behind them. Additionally, we selected our variables by considering both vulnerability and harm indicator concepts: the first one indicates the possibility of being harmed, and the others evaluate the current or future states (good or bad) of a system (Hinkel 2011; Fig. 1).

Given that the ICV was focused on the sustainable provision of fisheries ecosystem services, the vulnerability assessment encompassed three components of SESs: species vulnerability (SP), ecosystem vulnerability (ECO), and adaptive capacity of coastal communities (AC). Each component was formed by different indicators and variables (to be described in the next section) that varied from 0 to 4 (AC component), 0 to 8 (SP component), and 0 to 5 (ECO component). An equal weighting approach was used to weigh components as it was assumed that each component is equally important to coastal vulnerability.

However, given that our decisions in the process of weighting the indicators could be unclear, we ran a sensitivity analysis to improve transparency in the construction of the composite index and to check the robustness of our findings. In addition to the equal weight approach, we tested three other weighting schemes to check how each component contributed to estimating the index values. To do so, we calculated the index by emphasizing one dimension at a time and assigning a 1/2 to the emphasized component and 1/4 to the other two. For example, in the first test, the AC component receives a 1/2 weight, whereas SP and ECO would receive a 1/4 weight each. In the next round, a different component would receive a 1/2 weight and so on. Although each of these weighting approaches affected the index values, the final ranking of coastal states was very similar across them (Appendix 1). Furthermore, from a social-ecological perspective, social and ecological parts of a system are equally important, thus further supporting the adopted equal weighting approach. Finally, the weighting approach we used has been applied in other composite indexes in environmental contexts (Swanson et al. 2009, Moreno-Sánchez and Maldonado 2013).

To build the ICV, all variables were turned into quantitative data, and each component was normalized to vary from 0 to 1. We considered the median of each component to calculate the ICV value. A higher AC implies lower vulnerability; therefore, the lower the index value, the lower the system’s vulnerability. The final value of the ICV was determined as follows:

Equation 1(1)

We calculated the ICV for each state along the Brazilian coastline (N = 17; Fig. 2). The ICV value varied from 0 to 2 points, i.e., the sum of maximum scores for SP and ECO components. However, we also rescaled the final values to range from 0 to 1. The total points were then assigned to a qualitative scale with 5 levels, ranging from least vulnerable (very low) to most vulnerable (very high), and each state was categorized according to its final index value (the categories were arbitrarily defined): very low (0 to 0.20), low (0.21 to 0.40), moderate (0.41 to 0.60), high (0.61 to 0.80), and very high (0.81 to 1.00). To better examine the results, we created sensitivity maps from these categories for each component and for the final value of the coastal vulnerability index: AC (green sale), SP (orange scale), ECO (blue scale), and ICV (red scale).

Thus, the index was designed by combining information from different sources with feasible and low-cost variables. Moreover, the index is easily replicable by nonexperts and provides a quick and general overview of large geographic areas without exhaustive and expensive data collection, thus enabling policy makers to better anticipate future regime shifts.

Assessing adaptive capacity

Adaptive capacity (AC), which is defined by the ability of households to anticipate and respond to changes and to minimize, cope with, and recover from the consequences of such changes (McClanahan et al. 2008), was included in the equation as it contributes to decreasing vulnerability (Béné et al. 2016). It can be estimated by social and human capital, ability to learn, and governance aspects of a given society (Adger 2003, Lebel et al. 2006). Social capital, e.g., social cohesion, specifically, contributes to decreasing vulnerability because it can create an appropriate social environment to sustain the changes and unlock the capacities of communities to adapt to changes (Adger 2003, Béné et al. 2016). Human capital, such as livelihood resources or human conditions, is an important contributor to community resilience (McClanahan et al. 2008). The ability to learn refers to how communities can learn from environmental disturbances and social-environmental actions that occur in their area (Marshall and Marshall 2007). Social or environmental changes may teach people how to behave when facing future disturbances; hence, communities that can learn from such changes tend to be more resilient. Governance, e.g., structures and processes used by societies to share power and collective actions, can be expressed through norms of interaction, which shape the contexts in which human groups challenge decisions and determine access to resources (Lebel et al. 2006). Good governance regimes have attributes that can improve the fit between knowledge, action, and social-ecological contexts, thereby allowing societies to better respond to changes (Lebel et al. 2006).

Although it is important to recognize that coastal populations are not homogeneous (Khan et al. 2018), and that existing groups, e.g., minority groups and different social classes, are not equally vulnerable when faced with changes (Cinner et al. 2015), we do not have this type of social data to analyze how equity and justice influence the distribution of impacts. For instance, the inclusion of women in fisheries and fisheries governance can reduce their vulnerability and improve their livelihoods (Alonso-Población and Siar 2018). Knowing this could improve actions to deal with uneven vulnerability. However, studies examining gender inequalities in fisheries remain incipient in Brazil.

The specific measures of adaptive capacity we used were the human development index, a proxy for social and human capital; educational attainment, a proxy for ability to learn; presence of an environmental council with solid environmental laws and investment in environmental actions, a proxy for governance; and presence of social and fishery organizations, a proxy for social capital, to assess the ability of human groups to cope with changes and sustain resource users and local institutions (Table 2).

Assessing species vulnerability

The species vulnerability (SP) dimension includes biological and ecological information on the fish stocks used by artisanal and industrial sectors in the coastal region. For each state, we used landing data and selected the 10 target species with the most recorded landings (in weight) considering both the industrial and artisanal sectors together. In 4 states, the species targeted exclusively by the artisanal sector comprised the bulk of the 10 most abundantly landed species (Fig. 2). We collected biological information on these fish using the information already provided by FishBase: resilience, vulnerability, price category, threat category, trophic level, and distribution range (Froese and Pauly 2017). We also considered the fishing pressure, whether species were caught by 1 or 2 sectors, and the status of the fish stocks (Appendix 2). We did not consider the size or mobility of the fleet. We used the average scores for the 10 fish in each of the indicators that form the species vulnerability component. These indicators represent a proxy for biodiversity security because they capture fish species exposure, ecological vulnerability, and distribution aspects (Table 2).

Assessing ecosystem vulnerability

Communities, such as coastal communities, that depend directly on natural resources, are highly vulnerable to the effects of mismanagement, climate change, overfishing, and environmental degradation, which can negatively impact social-ecological vulnerability (Metcalf et al. 2015). We estimated some environmental indicators of marine ecosystems that can influence fisheries. Ecological studies predict that biological impoverishment will increase in the future, which will eventually threaten fisheries (Cardinale et al. 2012) and affect ecosystem health (Béné et al. 2017). Moreover, ecosystem health is a growing concern, especially around densely populated coastal areas where hot spots have been identified (Heileman 2009). We used estimates of primary productivity, level of marine protection, coastal pollution, climate exposure, and the percentage of conservation priority areas as input indicators to determine ecosystem vulnerability (ECO; Table 2).

Coastal social-ecological systems in Brazil

To test the ICV, we considered the SESs of fishing communities located along the coast of Brazil, an area covering 8500 km along the western Atlantic, together with their marine environment, including their fishing area in the exclusive economic zone (3.5 million km²). The regional level adopted was based on the political state scope needed to help implement coastal management policies in the future. Brazil has 17 coastal states distributed across 4 regions: North, Northeast, Southeast, and South. For most of them (11), the state capital is located near the coast.

We also discuss the data in terms of the marine ecoregions they represent, following the ecoregion definition of Spalding et al. (2007). Specifically, these 17 states are distributed over 5 marine ecoregions: Amazonia; Northeastern Brazil, including Fernando de Noronha/Atoll das Rocas/Sao Pedro and Sao Paulo Islands; Eastern Brazil, including Trindade and Martin Vaz Islands; Southeastern Brazil; and Rio Grande (Fig. 2).

The Brazilian coast encompasses a vast diversity of ecosystems, including mangroves, coral and rocky reefs, lagoons, and estuaries (Prates et al. 2012). These ecosystems provide a variety of marine resources and benefits that play an important role in the Brazilian economy (Elfes et al. 2014), such as those resulting from coastal and oceanic fisheries.

The Northeast region is the quantitatively most important as it produces more than 36% of total catches in the country, and this total is mainly because of artisanal fishing (WWF 2016). The South region is the second most productive, followed by the Southeast and North regions (WWF 2016). The industrial fishing sector is present mainly in the South and Southeast states (Dias-Neto and Dias 2015). Considering the most recent and reliable estimates of fish production per state in Brazil, the states of Santa Catarina (South), Pará (North), Bahia (Northeast), Rio de Janeiro (Southeast), Maranhão (Northeast), São Paulo (Southeast), Rio Grande do Norte (Northeast), and Ceará (Northeast) are the most productive (Dias-Neto and Dias 2015). The total fishing fleet is roughly 65,400 vessels and is formed mostly by small boats, e.g., rowboats, sailboats, or small motorized boats, used mainly by the artisanal fishers in the Northeast region (Dias-Neto and Dias 2015). The industrial and artisanal fishing sector catches increased from an estimated average of 190,000 t/yr in the early 1950s to about 840,000 t/yr in the late 2000s (Freire et al. 2014, 2015). Such an increase has put most Brazilian marine fish stocks under intense exploitation or in a situation of overfishing (Ruffino and Abdallah 2016, WWF 2016).

In general, fishing is carried out using gill nets, bottom trawling, fish and crustacean bottom traps, longlines, and hook and lines. Artisanal fisheries target reef and coastal fish, e.g., groupers and snappers, such as species from the genera Epinephelus and Lutjanus; whereas industrial fisheries target small and large pelagics, e.g., sardines and albacores, such as species from the genera Sardinella and Thunnus (Dias-Neto and Dias 2015, Freire et al. 2014, 2015). It is estimated that fisheries in Brazil employ more than 1 million fishers, with 41% represented by women (Ministério da Pesca e Aquicultura 2013), although these data are controversial because of low credibility. The majority of fishers (84%) are concentrated in the North and Northeast regions, led by Pará (24%), Maranhão (17%), and Bahia (12%; Ministério da Pesca e Aquicultura 2013). If we include everyone along the fishing value chain, the number of people involved in the fishing sector can reach up to 3.5 million people (Dias-Neto and Dias 2015). Moreover, there are 2081 registered fishery associations in the country (Lopez 2018).

Pollution, overfishing, and socioeconomic changes, e.g., urbanization and tourism, are the main drivers of changes to coastal SESs in Brazil (Ministério do Meio Ambiente [MMA] 2011). In general, Brazilian fisheries management is inadequate and incapable of promoting sustainability for fishing SESs (Dias-Neto 2010, WWF 2016). Some initiatives, such as comanagement, have been helping decrease pressure on these systems (Kalikoski et al. 2009). However, lack of regulations, enforcement, and engagement of fishers to maintain fisheries in the long term creates a gap of information and increases exploitation rates and the risk of species extinction. Furthermore, the increased degradation and environmental changes to marine ecosystems have affected their ability to provide marine ecosystem services.

Data sources

We assessed fish stock characteristics, e.g., stock status and species biological traits; ecosystem indicators, e.g., biotic and abiotic variables; and social aspects, e.g., socioeconomic, demographic, and governance factors, in the 17 coastal states (Table 2). The information used to build all indicators was extracted from the most recent data sets available online: the Brazilian Institute of Geography and Statistics (IBGE; http://www.ibge.gov.br), the Institute for Applied Economic Research (IPEA; http://mapaosc.ipea.gov.br), the Brazilian Ministry of the Environment (MMA; http://mma.gov.br), Oracle data set (Bio-ORACLE; http://www.bio-oracle.org/), and FishBase (http://fishbase.org).

Industrial and artisanal fisheries landing data were extracted from the Sea Around Us database, which is a temporal series that spans from 1950 to 2010 (Freire et al. 2015). Abiotic variables, e.g., sea surface temperature, salinity, and chlorophyll-a, were extracted from the Bio-ORACLE database, comprising data from 2005 to 2010 (http://www.bio-oracle.org,; Tyberghein et al. 2012, Assis et al. 2018). Fish species information was extracted for 2017 from the FishBase database (Froese and Pauly 2017). Social aspects were extracted from the demographic census data set from 2010 (IBGE 2011) and from the latest update of the civil society organizations registered by the government in 2015 (IPEA 2017). Information about marine protected areas (MPAs) was aggregated using national data published by the Brazilian government in 2012 (Prates et al. 2012).

Data analyses

We used a Bayesian generalized linear model (BGLM) to analyze the influence of five independent variables on the states’ ICV (dependent variable), namely, fish landing richness, fisheries instability indicator, market indicator, coastal extension, and coastal population. Richness was calculated for the period 2001 to 2010 because the data used for the construction of the ICV were from this period. The fisheries instability indicator refers to the tendency of fisheries provision to either remain stable in the face of some perturbation or rapidly return to preperturbation levels (Appendix 3). Per capita fish consumption (kilograms per inhabitant per year) and urban access (linear distance between landing port and state capital) were combined to form a market indicator that attempts to capture fisheries market demand in the coastal states (Appendix 4). To account for the possibility that coastal extension could intensify the degree of anthropogenic changes and economic development and lead to increasing pressure on local ecosystems, we used the coastal extension of each state, measured in kilometers. We examined whether coastal population was affecting ICV because previous studies have suggested that this is an important predictor of fish assemblage structure in rocky shores (Teixeira-Neves et al. 2015) and that population growth and urban expansion are important threats to biodiversity because of increasing exploitation rates (McGill et al. 2015). We used the most recent information regarding coastal population as a percentage of total state population (IBGE 2011). All predictor variables were extracted from the landing data set and IBGE reports.

The final model was selected using a forward stepwise procedure from the starting model. To compare the goodness of fit between each model, two different measures were computed: the Watanabe-Akaike information criterion (WAIC) and the deviance information criterion (DIC). WAIC is a fully Bayesian measure that is better suited than the Akaike information criterion because it uses the entire posterior distribution to make inferences about the parameters and, therefore, provides more precise estimates (Watanabe 2010). DIC is the most popular measure to compare and select the best Bayesian model by a sensitivity analysis performance (Spiegelhalter et al. 2002). Only the final model will be considered and discussed, although the others will be shown as well. The analyses were carried out with the R-INLA package (Rue et al. 2009) of R software (R Core Team 2017) to perform the BGLM.

RESULTS

Index of coastal vulnerability

The average ICV for the Brazilian coast was 0.77, which, according to the proposed qualitative scale (high category ranges from 0.61 to 0.80), is considered high vulnerability. The ICV ranged from 0.33 to 1, with the state of Ceará (ICV = 1) being the most vulnerable and Alagoas (ICV = 0.33) the least vulnerable. Both states are located in the Northeastern ecoregion. Most states in the Northeastern and Eastern ecoregions presented higher scores than the Brazilian average, as did the states of Santa Catarina, in the Southeastern ecoregion, and Amapá, in the Amazonia ecoregion (Table 3, Fig. 3).

The average value for adaptive capacity was 0.74 and ranged from 0.50 to 0.88. More than half of the states (53%) presented scores below the national average. The state of Pernambuco had the lowest score (AC = 0.50), and the states of Rio de Janeiro (AC = 0.88) and Rio Grande do Sul (AC = 0.88) had the highest adaptive capacities. For the species vulnerability component, the country average was 0.57 and ranged from 0.40 to 0.63 among states. The vulnerability of fish species was highest in the state of Ceará (SP = 0.63) and lowest in Paraná (SP = 0.40). Finally, the ecosystem component revealed that the state of Bahia (ECO = 0.99) was more vulnerable than the others. The country average for this component was 0.90 and ranged from 0.60 to 0.99 (Table 3, Fig. 4).

In general, the species vulnerability component was classified as moderate, the adaptive capacity component as high vulnerability, and the ecosystem vulnerability was considered very high in almost all coastal states (N = 14; Table 3). The coastal vulnerability index and the 3 vulnerability components revealed little variation among the 5 ecoregions. However, in general, the Amazonia and Northeastern ecoregions were more vulnerable. Almost half of the states presented ICV values classified as very high and above the national average values (0.77 out of 1).

Aspects defining coastal vulnerability in Brazil

The final BGLM, based on the lowest WAIC, included fish landing richness and coastal population as relevant variables to explain coastal state ICVs (Table 4). There was a 79% probability that states with lower numbers of species in their landings were more vulnerable (Fig. 5A), and a probability of 94% that a higher coastal population indicates higher coastal vulnerability (Fig. 5B). Stability in fish provision, the market indicator, and the extension of coastal states did not affect a state’s vulnerability.

DISCUSSION

Notwithstanding the importance of the ecosystem services provided by coastal regions, increasing evidence indicates that coastal ecosystems have been deeply altered, thus reducing their productivity and resilience (Jackson et al. 2001, Ojea et al. 2017). Such effects have intensified conflicts over resources (Prestrelo and Vianna 2016), thereby affecting social-ecological vulnerability in coastal areas. The vulnerability index we created sought to develop an integrative approach that embraces different perspectives of the fisheries system. Given the difficulty and complexity in operationalizing vulnerability (Bennett et al. 2016, Comte et al. 2019), the ICV holistic approach helps untangle the root of anthropic stressors in coastal areas, given that centralized solutions to climate change seem insufficient. At the local level, the ICV facilitates assessments and comparative analyses of community vulnerability. Additionally, it enables a robust assessment of fisheries vulnerability and identifies locations where supplementary analyses should be conducted to better plan priorities for investment along the coast. By relating the ICV to external variables, it is also possible to identify the main drivers of poor vulnerability performance in a given region. For example, in the Brazilian case study we explored, the number of species presented in fish landings and the size of coastal populations were strongly related to coastal vulnerability. Our case study also highlighted how adaptive capacity alone, without investments in performance of how we exploit ecosystems services, is not enough to assure lower levels of SES vulnerability.

Considering the assessed components of the ICV, ecosystem vulnerability performed the worst, whereas climate exposure, primary productivity, and coastal protection presented high scores (above 0.9 points, the very high vulnerability category) and must be considered by managers (Appendix 5). Based on the climate scenarios that point toward a warmer future in Brazil, coastal ecosystems are expected to suffer thermal stress above their adaptative capacity (Soares et al. 2014, Bernardino et al. 2015). Thus, to prevent and minimize climate-induced damages to fishing SESs, ecosystem responses to global climate changes need to be taken seriously by improving the adaptive capacity and resilience of coastal communities to deal with future scenarios. Moreover, unsurprisingly, primary productivity and coastal protection performed badly. Fishery nursery areas, e.g., coral reefs and mangroves, in Brazil have been affected by many human threats, such as coastal development, pollution, deforestation, and, again, climate change (Prates et al. 2012). Some predictions have suggested that 40% of Brazilian reefs are at a high risk of declining in the very short term (Rodríguez-Ramírez et al. 2008). Estuarine environments, which support relevant ecological functions, are considered to be the most threatened coastal ecosystems in the Brazilian marine ecoregions (Bernardino et al. 2015, Sunday et al. 2015).

Although the Northeastern and Eastern ecoregions present moderate coastal habitat modification when compared with the other regions that have been severely modified (Heileman 2009), we have identified these to be the most vulnerable coastal areas. This is in accordance with a global study that analyzed species richness, endemism, and higher taxonomic uniqueness and concluded that the Northeastern ecoregion is vulnerable and should be included as a priority ecoregion for conservation purposes (Olson and Dinerstein 2002). For instance, the state of Rio Grande do Norte, which was identified to be the third most vulnerable state, showed the largest coastal degradation with about 56% of the mangrove area converted into shrimp farms (Prates et al. 2012). This state has also been affected by the high mobility of the industrial fleet from Ceará (Freire and Pauly 2010), the northeastern state in the worst situation.

Despite the increased effectiveness of Brazilian MPAs (Araújo and Bernard 2016), lack of protection, institutional support, and unsatisfactory management continue to be reported in coastal areas (Maretti 2001, Schiavetti et al. 2013, Santos and Schiavetti 2014). Additionally, MPAs still fail to protect critical nursery areas (Ervin et al. 2010, Nagelkerken et al. 2015), a factor widely aggravated by the biased distribution of MPAs across Brazilian ecoregions (Magris et al. 2013). Only part of the Northeastern marine ecoregion has some sort of no-take protection, and the distant islands of São Pedro and São Paulo lack protection entirely (Magris et al. 2013). Notwithstanding the proposed governmental initiatives to establish and monitor MPAs, which includes analyzing new priority areas along the coast (Prates et al. 2012), no concrete action has been taken.

On the other hand, adaptive capacity performed better than the other ICV components, which was mainly attributed to the fact that more than 50% of coastal municipalities have social and fisheries organizations. Communities that are more socially organized are considered less vulnerable because organization decreases the transaction costs for collective actions (Cinner et al. 2009). However, of the total 820,000 civil society organizations distributed throughout Brazil, there are only 2081 registered with the government that are associated with developing and advocating for the rights and interests of fishermen and fisherwomen (Lopez 2018). Despite the overall presence of social organizations, the low participation of people in local decision making has been widely recognized in coastal areas, including in Brazil (Lopes et al. 2011, Silva and Lopes 2015). Nevertheless, the existence of environmental laws, environmental councils, and some financial investment in environmental programs may nudge the political willingness toward supporting the protection of coastal areas. However, it is important to highlight that we considered only some aspects of human and social capital (e.g., educational attainment and presence of social organizations). Other adaptive capacity indicators, such as collective action, ability to organize, livelihood resources, and human conditions, should be considered in future studies whenever this information is available to refine the index.

Different fishers’ groups from coastal communities can respond differently when facing ecosystem changes (Cinner et al. 2015, Silva and Lopes 2015). A clear role for people and the equitable sharing of costs and benefits is needed in vulnerability assessments (Tschakert et al. 2013). For instance, gender inequality has gained increasing attention in environmental management initiatives over the last decades (Agarwal 2010, Kleiber et al. 2017). Within small-scale fisheries, the recent female empowerment movement has promoted good examples of collective action and adaptation (Alonso-Población and Siar 2018, de la Torre-Castro 2019). Furthermore, given that over the last 10 years the Brazilian fishing policy (National Policy of Sustainable Development of the Aquaculture and Fisheries, Federal Law No. 11.959/2009; Federative Republic of Brazil 2009) has considered the production and repair of fishing gear and boats and fish processing to be fisheries activities, the percentage of fisherwomen has increased (Dias-Neto and Dias 2015). Still, the lack of social data on gender inequalities remains. Considering the social and gender inequalities in fisheries, any work toward decreasing them should have direct consequences on female livelihoods and female engagement in fisheries management and, thereby, reduce vulnerability and negative effects on the SESs (Biswas 2017). Although we do not have social data to analyze uneven vulnerabilities, we recognize this to be a fundamental contributing factor to achieving sustainable and equitable goals in marine conservation.

Similar to the other components of the ICV, the results of species vulnerability revealed regional differences. Although most species were found to have low threat levels (moderate vulnerability), the Northeastern and Eastern ecoregions included the most vulnerable states, mostly because of their elevated artisanal and industrial fishing pressures. Some species, e.g., Cynoscion acoupa, Lutjanus purpureus, Micropogonias furnieri, Mugil liza, Sardinella brasiliensis, Thunnus albacares, and Scomberomorus cavalla, are targeted by both sectors, whereas others have limited distribution ranges, e.g., Anchoviella spp., Cynoscion spp., Diapterus rhombeus, Haemulon plumierii, Lutjanus spp., Macrodon spp., M. furnieri, Opisthonema oglinum, S. brasiliensis, and Sparisoma spp. (Appendix 6). Distribution range, specifically, is one of the most important predictors of extinction risk among terrestrial and aquatic mammals (Davidson et al. 2009, 2012), amphibians, reptiles (Veron et al. 2016), and fish (Sunday et al. 2015). In the ocean, range shifts have been faster than in terrestrial ecosystems (Pinsky et al. 2013), and species with lower latitudinal ranges are more vulnerable because they become less able to find spots that fit their thermal preferences (Sunday et al. 2015). Some fish are also shifting to deeper waters or higher latitudes in response to climate change, e.g., because of increased seawater temperature, prey distribution, and so on (Perry et al. 2005). These changes in distribution patterns are likely to have tremendous impacts on fisheries and, consequently, result in alterations in community interactions. Thus, because local impacts could cause biodiversity loss of marine ecosystems on a global scale (Hawkins et al. 2000), it is crucial to consider the high vulnerability of restricted-range species in future coastal management to avoid even higher risks of extinction.

Although the ecosystem services approach has been largely incorporated into current societal discourse, anthropogenic influence on biodiversity loss will eventually threaten these services, especially through species extinctions caused by excessive fishing, pollution, habitat destruction, and other anthropogenic drivers (Cardinale et al. 2012, Bennett et al. 2016). Our findings agree with the Anthropocene concept applied to the fields of ecology and conservation, which refers to the epoch in which human impacts started to overtake natural processes (Gibbard and Walker 2014). Specifically, we observed that the lower the fish landing richness and the higher the coastal population, the higher the vulnerability of the state. This was an expected relationship because the typical models of human development in Brazil and in most places are based on the intensification of human exploitation of nearby coastal resources and increased coastal pollution, which affect coastal environments (Teixeira-Neves and Neves 2015, Hughes et al. 2017). Changing such models is a task that is overdue to be accepted, internalized, and performed by managers and policy makers, as we run out of time to maintain society’s minimum livelihood standards.

MANAGEMENT IMPLICATIONS FOR COASTAL VULNERABILITY IN BRAZIL

The national score of 0.77 (out of 1) suggests that overall vulnerability is high, despite the high levels of adaptive capacity identified. Because of the low variation among ecoregions and/or states, our findings suggest that the entire Brazilian coast has been widely compromised, making marine biodiversity conservation an urgent need. Some states, such as Ceará, clearly perform worse than others and require immediate attention.

In general, fishing communities in Brazil are culturally diverse, but characterized by the same precarious socioeconomic conditions and governability problems. This scenario can be smoothed by investments in coastal management to maintain long-term marine fisheries sustainability. Furthermore, to decrease the vulnerability of coastal habitats, we recommend enhancing fisheries management by monitoring coastal areas, restoring vulnerable habitats (mangroves, estuaries, and coral reefs), increasing actions to improve adaptive capacity, and expanding MPAs and comanagement approaches.

The low variation among marine ecoregions does not mean that the index is not effective at capturing changes over time, but rather that Brazilian coastal states share many similarities and have been affected by the same social and ecological problems. We suggest that this index be applied to other coastal systems for further evaluations and comparisons.

BLIND SPOTS

The ICV index helps determine the vulnerability of coastal communities in a straightforward way by synthesizing a complex system into a unique number that enables comparison of different areas. However, some gaps should be filled by further research to refine the index. For instance, fleet dynamics, such as size, and fleet mobility were not considered but could bring important information about fisheries dynamics and their impacts on the coast. Despite the fact that catch data is the most basic data needed to manage fish stocks, some countries, such as Brazil, do not have a history of fisheries statistics, thereby making it difficult to accurately define stocks in need of protection and measure coastal vulnerability accordingly. Additionally, even though our study supports the usefulness of the index for analysis on a local scale, some calibration would help its application in other coastal areas. In specific community-level scenarios, different variables may be required to form each indicator and component to track the context information of a given coastal area. Future research is also needed to identify better surrogates for social inequalities, to develop more appropriate objectives to represent minority social groups (e.g., fisherwomen), and to identify the processes that threaten them.

Even though the adaptive capacity component only has a few indicators, because of the data-poor situation in Brazil, when compared with the other components, the sensitivity analysis supported the robustness of the index. Still, whenever possible, additional measures of adaptive capacity should be used, such as those relating to diversity and occupation flexibility, e.g., livelihood characteristics and willingness to change; access to assets, e.g., cultural memory and natural capital; learning and knowledge, e.g., ability to learn and environmental perception; and governance and institutions, e.g., gender relations and levels of trust and cooperation (Adger 2006, Whitney et al. 2017).

However, the index was tested in a marine hot spot country, where coastal areas are undergoing negative changes faster than in other marine areas worldwide (Pecl et al. 2014). These marine hot spots are natural laboratories for social-ecological changes. They are also priority areas for research as they provide valuable case studies to help identify adaptation strategies that can be adopted in other coastal communities facing threats caused by a rapidly changing world (Pecl et al. 2014). Unfortunately, the index, whether applied to Brazil or elsewhere, is limited by the availability of reliable variables at different scales, making it difficult to have a more complete and expert-based process in the selection of variables. Despite these limitations, the ICV used robust Bayesian methods to analyze qualitative and quantitative data from social-ecological fishery systems, an important new contribution to coastal fishery management in developing countries.

CONCLUSIONS

We are likely living in a catastrophic geologic era that demands new ways of thinking about human-nature relations. Our study helps us consider vulnerability in a new light, i.e., with a focus on communities and their individuals and experiences. At this level, it is possible to identify multiple interacting drivers of change and exposure to vulnerabilities and propose locally feasible solutions to improve the sustainability of human-coastal relationships. Among the most important advantages of the new index are its low cost to generate powerful results and its flexibility to adjust to other social-ecological contexts depending on data availability. However, it is important to highlight that, when applying the ICV to other contexts, it is necessary to adapt it to the local social-ecological reality by considering the available variables without compromising the robustness of the index, for example, by attributing enough and meaningful variables to each component.

Our findings are consistent with the literature on small-scale fisheries in the Anthropocene that shows the risks derived from the rapid increase in population density in coastal areas. By pointing out weaker spots in the coastal system, the index helps provide some of the baseline necessary to manage fisheries in a holistic way with the goal of maintaining social-ecological benefits. Finally, there is growing scientific evidence about coastal vulnerabilities worldwide, and excuses about lack of knowledge will not be accepted in the future. It is past time we shed some light on the complex relationships in SES systems in the global south.

RESPONSES TO THIS ARTICLE

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ACKNOWLEDGMENTS

We acknowledge Lucyanno Fernandes for his great assistance in the spatial analysis using GIS. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. M. R. O. Silva thanks FAPERN for a doctorate grant. P. F. M. Lopes thanks CNPq for a productivity grant.

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Address of Correspondent:
Monalisa R. O. Silva
Departamento de Ecologia
Campus Universitário, Lagoa Nova
Natal, RN 5907890
Brazil
moninharodrigues@yahoo.com.br
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