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Raudsepp-Hearne, C., and G. D. Peterson. 2016. Scale and ecosystem services: how do observation, management, and analysis shift with scale—lessons from Québec. Ecology and Society 21(3):16.
http://dx.doi.org/10.5751/ES-08605-210316
Research, part of a special feature on Programme on Ecosystem Change and Society (PECS): Knowledge for Sustainable Stewardship of Social-ecological Systems

Scale and ecosystem services: how do observation, management, and analysis shift with scale—lessons from Québec

1McGill University, 2Stockholm Resilience Centre, Stockholm University

ABSTRACT

Ecosystem service assessment and management are shaped by the scale at which they are conducted; however, there has been little systematic investigation of the scales associated with ecosystem service processes, such as production, benefit distribution, and management. We examined how social-ecological spatial scale impacts ecosystem service assessment by comparing how ecosystem service distribution, trade-offs, and bundles shift across spatial scales. We used a case study in Québec, Canada, to analyze the scales of production, consumption, and management of 12 ecosystem services and to analyze how interactions among 7 of these ecosystem services change across 3 scales of observation (1, 9, and 75 km²). We found that ecosystem service patterns and interactions were relatively robust across scales of observation; however, we identified 4 different types of scale mismatches among ecosystem service production, consumption, and management. Based on this analysis, we have proposed 4 aspects of scale that ecosystem service assessments should consider.
Key words: covariance; ecosystem service bundles; Mont Saint-Hilaire; problem of fit; scaling; social-ecological; spatial; trade-offs

INTRODUCTION

The management of ecosystem services requires scale-appropriate information about the condition, dynamics, and use of multiple, and often interacting, ecosystem services. However, choosing the scale at which ecosystem services should be assessed is not evident. The issue of scale is complex in ecosystem service research and assessment because individual and bundles of ecosystem services are generated by a variety of social-ecological processes and structures, each with distinct spatial scales. The distribution of benefits and the management of ecosystem services also occur at particular scales. Interactions between some ecosystem services may be observable at some scales and not others, and information generated at particular scales may or may not be usable by managers acting at other scales.

Managers need to know at what scales ecosystem services are produced, used, or accessed to identify associated societal values and management incentives. Understanding the scales of these different processes is important in developing an effective management approach that takes into account the presence or absence of social-ecological feedbacks (Reyers et al. 2013). Ecosystem services are being assessed at many different spatial scales (Malinga et al. 2015), but how scale matters for ecosystem service assessment is poorly understood. Despite recognition of the importance of scale in ecosystem service research (MA 2003), very little is known about the scales associated with different ecosystem service processes, and there are few tools or approaches for making sense of scale in ecosystem service assessment and management (MA 2003, de Groot et al. 2010). Some researchers have suggested that information should be developed at the social scales where decision making occurs (Gitay et al. 2005), but decision making often occurs at multiple scales and may require more complex multiscale assessments (Scholes et al. 2013).

To produce clear and relevant information about ecosystem services, research and assessments must consider the scales of different ecosystem service processes and be aware of the implications of choosing a particular scale of observation and analysis. We address these issues by first introducing what we hypothesize to be important scale issues related to the assessment of ecosystem service processes in social-ecological systems. Second, we explore these issues in a case study system in southern Québec, Canada (Raudsepp-Hearne et al. 2010). To analyze how scale of observation affects the information that is gathered about interactions among ecosystem services, we quantify and map seven ecosystem services at three spatial scales and an additional five services at the largest scale. We also compare the characteristic scales of ecosystem service processes, i.e., production, benefit distribution, and management, to investigate management implications of whether they are aligned with each other. Finally, we propose four aspects of scale that ecosystem service assessments should consider.

Scale of ecosystem service processes versus scale of observation

Ecosystem services are produced by social-ecological systems that are managed and shaped by humans (Andersson et al. 2007, Reyers et al. 2013). Management and engineering to enhance some ecosystem services can lead to both positive and negative impacts on other ecosystem services (Bennett et al. 2009). An ecosystem service “bundle” is the set of ecosystem services that is produced in a particular area as a result of engineering, management, and ecosystem service interactions, and it represents the net ecosystem service benefits that are available to the population living there (Raudsepp-Hearne et al. 2010).

Ecosystem service patterns observed in assessments are influenced by the characteristic scales of the underlying processes and the scale of observation (Hein et al. 2006). For example, water quality is produced at the scale of a watershed (Cumming et al. 2006); however, a local manager might monitor water quality at a smaller scale. The scale of observation determines the relative fineness or coarseness of details and patterns that are observed in a system and therefore included in an analysis, which can have major implications for how a system is understood and managed (Lant et al. 2005, Martín-López et al. 2009).

Scales of production, consumption, and management of ecosystem services

Ecosystem services are produced by land uses and their geographic patterns, ecological structures and functions, biodiversity, management practices, and complex interactions between ecological and social dynamics (Fisher et al. 2009, Reyers et al. 2013, Bennett et al. 2015). Determining the scale of ecosystem service production thus entails identifying the scale of all system components that contribute to ecosystem service production (Fisher et al. 2009).

The consumption of ecosystem service benefits occurs at multiple scales. By consumption, we mean the distribution of benefits associated with ecosystem services, which can be consumed, made use of, or simply enjoyed. We use the term “consumption” as shorthand to capture multiple uses and enjoyment of nature’s benefits, including both material and nonmaterial benefits. For example, farmers are the primary beneficiaries of crop production from which they gain their livelihoods, but the crops may also benefit people who sell or eat them or enjoy associated cultural practices. Understanding the scale of consumption is key to managing ecosystem services effectively, for example by developing scale-appropriate management incentives. The identification of scales of consumption also allows the identification of potential conflicts in environmental management, in particular between local stakeholders and stakeholders at other scales. Access to ecosystem services is moderated by how land and natural resources are managed (see next paragraph) and has scale-related repercussions for consumption patterns (Reyers et al. 2013).

Societies manage ecosystem services using rules and actions to alter the production or access to ecosystem services. We distinguish landscape engineering and controlling access to ecosystem services as two important types of ecosystem service management, each of which is associated with management rules and actions. Ecosystem service management may be nonexistent, e.g., for many regulating ecosystem services; may occur directly at the level of the site, e.g., a farmer or urban family altering ground cover; or may occur at larger scales, e.g., provincial or national laws regulating harvests or pollution (Chapin et al. 2006). Identifying the scale at which ecosystem services are managed is an important part of deciding on the scale of ecosystem service assessment because assessing ecosystem services at scales of institutions facilitates the uptake of information generated (Lant et al. 2005). However, management institutions may not always exist at the most appropriate scale (Turner and Daily 2008).

Scale mismatches

The scales of production, consumption, and management of ecosystem services do not necessarily align. Scale mismatches occur when the scale of environmental variation and the scale of the social organization responsible for use or management of ecosystem services are not aligned, causing a lack of feedback between social and ecological processes and potential inefficiencies, conflicts, or oversights in ecosystem service management (Cumming et al. 2006, 2013). The production of ecosystem services may not match the scales at which individuals or institutions manage ecosystem services, or the scale at which people benefit from the services.

There are several types of scale mismatches that could cause management problems. Management issues can arise when the scale of ecosystem service production is the same, greater than, or less than the scale of consumption, or when trade-offs among ecosystem services occur across scales (Fig. 1). When the scales of ecosystem service production and consumption do not match, the result may be a lack of management incentives or inadequate signals for ecosystem service management. Knowing more about the scales at which multiple, interacting ecosystem services are produced and consumed could help managers to avoid these situations.

Scales of observation in ecosystem service assessment

Observing the pattern of an ecosystem service on a map is helpful for developing effective and efficient management strategies for that service. When the processes described in the previous section are included in an ecosystem service assessment, the patterns they exhibit may vary depending on the scale of observation of the assessment. For example, previous work has found many ecosystem services to be highly clustered on landscapes, as opposed to evenly distributed, suggesting that observed patterns of ecosystem services will change significantly from one scale to the next (Turner and Daily 2008).

Additionally, single-scale observation may capture, miss, or distort ecosystem service interactions. Identifying trade-offs that exist among ecosystem services at different scales has been identified as critical to the sustainable management of ecosystem services (Carpenter et al. 2009, Bennett et al. 2015). For example, enhancing food production services at one site may produce trade-offs with water quality at larger scales that will only be observed if the assessment incorporates those scales.

There is little systematic knowledge about how ecosystem services interact and how these interactions vary across scales. Few studies have analyzed multiple ecosystem services across a landscape, and still fewer have examined how their covariance changes across scales (however, see Holland et al. 2011). We can identify ecosystem service interactions when multiple ecosystem services are correlated across space, either positively or negatively (Chan et al. 2006, Egoh et al. 2008, Holland et al. 2011), or through the identification of ecosystem service bundles (Raudsepp-Hearne et al. 2010, Turner et al. 2014, Queiroz et al. 2015, Yang et al. 2015). Interactions can arise from the following: a biophysical connection between services, such as when phosphorus accumulation in soils leads to loss of water quality in nearby rivers or lakes; because of social compatibilities or incompatibilities, for example the isolation of concentrated pork production from tourism and recreation areas; or through shared impacts from different drivers of change, such as when reduced seasonal rainfall impacts crop production, animal habitat, and water quality (Bennett et al. 2009, Reyers et al. 2013).

We analyze three aspects of ecosystem service distributions that are relevant to their assessment and management and that may vary with the scale of observation (Fig. 2). These include (1) individual ecosystem service patterns, (2) pairwise ecosystem service interactions, and (3) ecosystem service bundles.

METHODS

Study site

The study site is centered on the Mont Saint-Hilaire United Nations Educational, Scientific, and Cultural Organization Man and Biosphere Reserve (MABR), which covers 15 municipalities in southern Québec (∼700 km²). These 15 municipalities are embedded within a larger study site consisting of 2 adjacent watersheds (Richelieu and Yamaska watersheds) that cover 137 municipalities (∼7288 km²; Fig. 3). The area surrounding Mont Saint-Hilaire is primarily agricultural (∼60% of land), with pockets of urban settlements (∼20% of land) and green spaces (∼16% of land; Cumming et al. 2006). Information on ecosystem services from the larger study area is included in the scale analyses of ecosystem services, but we focus on management implications for the MABR. The MABR differs from the larger study site in that it is closer to an urban area, includes an important protected area, and does not include large tracts of forested, hilly land that are found at the far east of the larger study area.

This region is typical of many peri-urban agricultural landscapes around the world with increasingly industrialized farms and growth in residential development and tourism (Statistics Canada 2004). Ecosystem services that are important in the region include those associated with agricultural practices, urban and peri-urban living, tourism, and recreation. A selection of ecosystem services that are most relevant to the people living within this system was chosen to include in our analysis (see Raudsepp-Hearne et al. 2010), also attempting to capture a roughly equal number of ecosystem services from provisioning, cultural, and regulating categories (Table 1).

Ecosystem service quantification at multiple scales

In the 15 municipalities of the Mont Saint-Hilaire MABR, we quantified 7 ecosystem services at 3 spatial scales (Table 1). The scales compared include 1 km² (n = 587), 9 km² (n = 81), and municipalities (∼74 km², n = 15). We refer to the 1-km² spatial scale as the “smallest” spatial scale and the municipal spatial scale as the “largest” spatial scale. The smallest scale was chosen to represent the field or site scale, where individual management of the land is occurring. The middle scale was chosen to approximate a neighborhood or local landscape. The municipal scale was included because it is the scale at which many formal landscape management decisions are made. Very small scales, e.g., variation within a site, were not included, because these scales require resource-intensive fieldwork to sample and thus are not generally included in landscape-scale assessments. In the remaining 122 municipalities within the Richelieu and Yamaska watersheds, data were unavailable at the smaller scales, but 12 ecosystem services were quantified at the municipal scale. This allowed us to qualitatively analyze more types of ecosystem services in terms of their production, consumption, and management.

Detailed methods on how each ecosystem service was quantified at each scale are found in Appendix 1. We constructed grids in ArcGIS to sample data at the 2 smaller spatial scales. At the 1 × 1 km scale, we included only grid cells that were completely within the boundaries of the study area, whereas at the 3 × 3 km scale, grid cells with at least 50% of their area within the boundaries of the study area were included, and ecosystem service values were adjusted for area. At the largest (municipal) scale, we calculated the area of each municipality using boundaries from the 2001 Canadian census. A value for each service was calculated for each municipality and normalized for area. Ecosystem services at all scales were quantified using data for 2001 or as close as possible to this date. All data were transformed so that the maximum value of each ecosystem service in the landscape was set at 1. Final data were imported into an ArcGIS database for data analysis.

Analysis

Scales of ecosystem service production, consumption, and management

We assessed the scales associated with the production, consumption, and management of the 12 ecosystem services using hierarchies of scale (Wu 1999). We assigned the production, consumption, and management of each ecosystem service to the following hierarchical categories: site, e.g., field to farm (approximately <1 km²); local, e.g., neighborhood to municipality (>1 km² to 100 km²); regional, e.g., tourism region or watershed (>100 km² to 1000 km²); and global.

We identified scales of production by considering all the system components known to contribute to the production of that service, i.e., the ecosystem service production unit (as per Fisher et al. 2009). Evidence for ecosystem service production scales came from scientific literature and local sources of information on infrastructure and management (evidence is presented in Appendix 2).

We identified the scale of consumption for primary and secondary beneficiaries of each ecosystem service based on personal communications with local people and published information about the system. For example, farmers indicated that phosphorus retention in soil benefited them individually at the field scale and benefited people more generally at the landscape scale through protection of water quality (justification for each assignment is presented in Appendix 3).

To identify the scale of management of each service, we identified the managers in the region who both directly engineer the landscape to manage ecosystem services and regulate access to ecosystem services. For each of these categories we listed managers according to whether they performed actions directly on the landscape or whether they developed rules or policies. We identified the scale of management for each ecosystem service based on information from municipal and provincial government reports and websites (the principal managers in the region and examples of management actions and policies are presented in Appendix 4). Finally, we compared the scales of all of the previously mentioned processes, looking for scale alignment or mismatches.

Spatial patterns of ecosystem services across scales

We mapped individual ecosystem services in ArcGIS at the three spatial scales to visualize and compare their spatial patterns. We calculated spatial autocorrelation of ecosystem services at each scale using Moran’s I with queen contiguity using the R statistical software package sp (Moran 1950, Bivand et al. 2013, R Core Team 2014).

Ecosystem service trade-offs, synergies, and bundles across scales

To identify potential trade-offs and synergies among ecosystem services, we performed a correlation analysis among all 12 ecosystem services at the largest spatial scale (municipalities) and among all 7 ecosystem services at the smaller spatial scales (3 × 3 km and 1 × 1 km grids). At the largest scale, correlation analysis was performed with all municipalities in the larger study region (n = 137). Correlation analyses were conducted using the Pearson parametric correlation test in R. We then compared the number, direction, and strength of correlations among the 7 ecosystem services at each spatial scale to identify differences in service interactions across scales. Correlations among the additional 5 ecosystem services were analyzed only at the largest scale.

We identified distinct types of ecosystem service bundles at each scale using k-means clustering. We used three clusters, rather than the six found across the larger region (Raudsepp-Hearne et al. 2010) because of the lower number of ecosystem services and the reduced landscape diversity in the focal region. We compared the patterns between the three bundles detected at each scale. We also compared the bundles detected at the municipal scale to those found in an analysis of a larger landscape and a more diverse set of ecosystem services (Raudsepp-Hearne et al. 2010). The former comparisons indicate how the bundles change with scale, whereas the later analysis shows how the bundles vary with the ecosystem services that are included or the number of municipalities analyzed. Figures were created using the R packages maptools (Bivand and Lewin-Koh 2013) and RColorBrewer (Neuwirth 2011), and cluster analysis was conducted using the packages vegan (Oksanen et al. 2013) and fpc (Hennig 2013).

RESULTS

Scales of ecosystem service production, consumption, and management

Most of the ecosystem services in our study are produced either at the scale of a site or at the local scale. The exceptions are drinking water quality, which is produced at the scale of a watershed, and nature appreciation and deer hunting, which both rely on larger landscapes at the regional scale for species viability. Appendix 5 synthesizes all the results from the assignation of scales of production, benefit distribution, and management.

Most ecosystem service beneficiaries in the study area are consuming benefits at the site or local scales. “Local benefits” generally signifies the scale of the neighborhood landscape up to the scale of the municipality. Two regulating ecosystem services, soil retention of phosphorus and soil organic matter, benefit people primarily on-site, in other words on farmers’ fields. However, soil retention of phosphorus also benefits people at the watershed level through the contribution of this service to maintenance of water quality. The third regulating service, carbon sequestration, is unique in our study as the only ecosystem service that benefits people at the global scale. Consumption or demand for most services extends to the regional scale.

All but three ecosystem services are managed directly through landscape engineering. Deer hunting, nature appreciation, and carbon sequestration, as they are defined and measured by us, are the only ecosystem services that are not enhanced purposefully through engineering at any scale. Although carbon sequestration is also not managed through rules or policies, or actions regulating access to the service, some management of these types is occurring for deer hunting and nature appreciation. For example, access to deer hunting is managed at the site scale through private property protection and at the regional scale through government policies and laws that prescribe licensing rules, quotas, and hunting seasons. Access to nature appreciation is managed through the building and maintenance of trails and by provincial laws that regulate conversion of protected areas. Several ecosystem services are not subject to rules regulating either landscape engineering or access. In particular, carbon sequestration and soil organic matter are not managed formally through any regulations, although soil organic matter is managed at the site level through landscape engineering.

Individuals and municipalities jointly manage the rest of the ecosystem services through actions and rules related to landscape engineering and access to services, with input from local and regional governing bodies and nongovernmental organizations (NGOs). For example, forest recreation is engineered through underbrush clearing at the site scale, and through trail building and maintenance by nature NGOs at the local scale. Municipalities, the regional government, and NGOs develop policies on what types of engineering are allowed in protected forests. Landowners limit access to private forests at the site scale, and the municipal and regional governments regulate access to protected forests through policy and law.

All engineering actions to enhance ecosystem services occur at the site scale and sometimes also at the local scale, in the cases of drinking water, tourism, and forest recreation. Actions regulating access to ecosystem services generally occur at site and local scales, and at the regional scale in the case of tourism, where governments promote tourism to enhance access to this service. Rules and regulations governing landscape engineering and access to services exist at both local and regional scales, according to government jurisdictions. NGOs can alter landscapes directly, for example by cleaning shorelines, but mostly try to influence how ecosystem services are managed at municipal and regional levels.

Comparing scales of ecosystem service processes

Several ecosystem services are produced, consumed, and managed at the same scale and could be called scale aligned, e.g., soil organic matter (see Fig. 4). In other cases, there are potential scale mismatches, where ecosystem services are produced at one scale, but the benefits accrue to people at a different scale, e.g., carbon sequestration. Figure 5 presents a summary of comparisons of ecosystem service production, consumption, and management, as well as ecosystem service interactions across scales.

Spatial patterns of ecosystem services across scales

All ecosystem services were significantly clustered in space at all scales, as opposed to uniformly distributed on the landscape (P < 0.01), except for tourism at the municipal scale and pork at the intermediate scale (P > 0.05). Ecosystem service patterns showed some trends in spatial clustering across scales. Four out of 7 ecosystem services, i.e., crops, pork, maple syrup, and forest recreation, became less clustered when moving from observations at the smallest to the intermediate scale but were most clustered at the largest scale. Deer hunting became steadily more clustered on the landscape as the scale of observation increased. In contrast, tourism became less clustered as the scale of observation increased and was randomly dispersed at the largest scale. Only nature appreciation was most clustered at the intermediate scale.

Ecosystem service patterns changed in visibly different ways as they were mapped across the three scales (Fig. 6). Crop production and forest recreation changed evenly across scales, and the extreme clustering of other ecosystem services was even more obvious on maps than it appeared through the spatial autocorrelation analyses. Pork production occupied only a few cells on the landscape at the smallest scale of observation, but this high degree of clustering was smoothed out at larger scales. The scaling behavior of other services, such as deer hunting and nature appreciation, was between these extremes. From most even distribution to least were crop production, forest recreation, deer hunting, maple syrup production, nature appreciation, tourism, and pork production.

Ecosystem service trade-offs, synergies, and bundles across scales

Correlation analysis of 7 ecosystem services across 3 scales revealed similar patterns of positive and negative correlations at all scales (Fig. 7A, B, Appendix 6). However, there were more pairwise correlations among the 7 services at the 2 smaller scales than at the largest scale: 15 significant correlations at the 2 smaller scales versus 10 significant correlations at the largest scale (P < 0.05). Although 5 correlations were observed at both smaller scales that were not observed at the largest scale (Fig. 7C), the only interaction that was detected at the largest scale and not at smaller scales was the trade-off between pork production and nature appreciation.

At all scales, crop production was negatively correlated with all other services except pork production, significantly in all cases but 1. Crop and pork production were positively correlated at all scales (P < 0.05). Four correlations became steadily stronger as the scale of observation increased (Fig. 7A), whereas in all other cases the strength of correlations increased across the first 2 scales and then decreased at the largest scale (Fig. 7B).

Ecosystem service bundles were fairly robust across the two smaller scales and corresponded to an agriculture bundle, a multifunctional agricultural bundle with maple syrup and forest services, and an urban bundle with low levels of assessed services (Fig. 8). At the largest scale of observation, the bundling of the services was quite different, with several different mixes of agricultural dominance. However, the dominance of agricultural and forest-based services persisted.

In our comparison of the study area with the larger region (Fig. 8B), scale was kept constant, but bundles were impacted by changes in the number of ecosystem services and the number of municipalities analyzed. Changes in the number of ecosystem services included had minimal impact on the bundles identified, but bundles detected in the smaller study area were quite different from those detected across the entire region.

DISCUSSION

Effectively managing ecosystem services requires understanding the characteristic scales at which ecosystem services are produced, interact, and are consumed. The scales at which ecosystem services are observed or monitored fundamentally shape this understanding. Subsequently, we discuss how observation shapes ecosystem service mapping, trade-offs, and bundles and how different scales of production, consumption, and management can produce scale mismatches. We conclude with recommendations for how to better incorporate scale in the assessment and management of multiple ecosystem services.

Scale of observation

Our analysis demonstrates that scale of observation has substantial impact on our understanding of how ecosystem services occur on a landscape, less of an impact on patterns of correlations seen among ecosystem services, and a substantial impact on the identification of bundles of ecosystem services. In the case of some individual ecosystem services, e.g., crop production and forest recreation, patterns changed evenly across scales. For other ecosystem services, the pattern observed at the smallest scale was entirely hidden at the largest scale, e.g., pork production and nature appreciation.

Scale of observation has less influence on patterns observed for ecosystem services associated with extensive land covers and for any regulating ecosystem services that are produced at larger scales. Choosing a scale of analysis has more of an effect on patterns observed for cultural ecosystem services and provisioning ecosystem services not associated with extensive land covers, e.g., berries or wild fish, because these types of ecosystem services are characterized by presence/absence information and may be entirely absent in many parts of a landscape. The spatial heterogeneity of the production of such ecosystem services is not visible at larger scales of observation (BDTQ 2005). Differences among scales of observation are particularly pronounced for ecosystem services that are spatially clustered in small portions of the landscape, such as deer hunting. Assessing the spatial clustering of an ecosystem service at a fine scale, for example using Moran’s I, can be used to estimate which ecosystem services will be most misrepresented by observation at larger spatial scales (Moran 1950).

In our analysis, most relationships among ecosystem services are robust across scales. Changes in scale of observation did not greatly affect the number, strength, and type of correlation detected. This result is good news for trade-off analysis and management because data on ecosystem services are often scarce and scientists generally have to make do with whatever scale of data is available. Data availability restricted our analyses at the smaller scales to the MABR study site, a subset of the larger study region. Because the MABR comprised only 15 municipalities, interactions among ecosystem services at the largest scale were compared across the larger region (137 municipalities). We tested whether the same ecosystem service interactions could be observed if we only included the 15 municipalities within the MABR, or the 47 municipalities within the watershed holding the MABR. In both cases, 2 ecosystem service interactions remained the same, but many other interactions were no longer observed.

Analyses of ecosystem service bundles require careful consideration of what observation scale is appropriate because patterns of ecosystem service bundles were sensitive to changes in scale of observation. Within our study area, bundles were similar at the 2 finer resolutions, but they were quite different at the largest scale (municipalities; Fig. 8A). This implies that bundles can be somewhat robust to changes in scale of observation, but large changes may result in the reconfiguration of bundles. This is not surprising because what ecosystem services are present and how evenly they are spread across a landscape will influence the bundles that emerge. Ecosystem services that are heterogeneously distributed across a landscape are more likely to influence bundling in a larger study area if they are present in multiple areas, which is more likely at a larger scale of observation. For example, nature appreciation and deer hunting occur within very few of the 1-km grid cells but are found in many municipalities, the largest scale of observation. Consequently, the bundles identified at finer scales are less multifunctional and more specialized than the bundles produced by the landscapes within municipalities; that is, many of the units at smaller scales do not contain any amount of certain ecosystem services, but some level of each service can be found at the municipal scale. Evenly distributed ecosystem services may influence bundling at all scales, e.g., forest cover or crop production.

Determining whether data sets at particular scales are adequate for capturing ecosystem service patterns will depend on the goals and purpose of an ecosystem assessment. For example, comparing the impact of farm management changes on ecosystem service production will require different types of information than a comparison of ecosystem services in municipalities across a region. Our results showed that factors that changed the identified patterns among ecosystem services include the following: the number of units across which ecosystem services were compared; the size of these units and how these units were defined, i.e., whether units were defined using an arbitrary 1 × 1 km grid or using an integrated social-ecological border; and the heterogeneity among these units.

Consequently, detecting patterns among ecosystem services requires considering what type of units will represent an appropriate spatial grain for ecosystem service assessment and how many of those units are required to detect patterns among ecosystem services and units. Collecting and analyzing ecosystem service data within units that represent an entity in which multiple ecosystem service decisions are integrated, such as a watershed or municipality, is likely to provide results that are more meaningful for decision makers than units that are defined arbitrarily, such as Cartesian grid cells (Turner et al. 2014). Detecting patterns among ecosystem services and identifying bundles of ecosystem services depend on the intensity of the pattern relative to the variation among ecosystem services and units. Ecosystem service assessments should consider that observations from more units will be required to clearly define ecosystem service patterns when there is little variation among units (Queiroz et al. 2015, Meacham et al. 2016), but fewer observations are required when there is more variation among units (Yang et al. 2015).

Ecosystem service scale mismatches

We identified four types of management and production/consumption scale mismatches in our case study landscape. These include the following: consumption > production, production > consumption, management ≠ production, and trade-off mismatch (Fig. 9).

Consumption > production mismatch

When an ecosystem service is produced at a scale smaller than the scale of consumption or use, there is no incentive for people at the smaller scale to manage that service. We observed two ecosystem services in the study area that exhibit this mismatch. In the clearest example, carbon sequestration benefits are consumed globally, even though it is at the level of the site that actions can be taken to influence carbon sequestration (Statistics Canada 2004). This mismatch could be eliminated by connecting the global consumption of carbon sequestration to local management via incentives to manage locally for carbon sequestration such as carbon markets, government subsidies (Wu 1999), or restrictions on activities that reduce sequestration.

Production > consumption mismatch

When the scale of production is greater than the scale of consumption, there is a potential for a “tragedy of the commons” outcome. The widely used typology of relationships between ecosystem service production and benefits proposed by Fisher et al. (2009) does not identify this type of relationship; however, it occurs with six ecosystem services in our study system (see Fig. 5). For example, deer hunting is produced at the landscape to regional scale, but humans kill deer at specific sites. Individually, hunters have little incentive to manage deer populations at larger scales as long as they can continue to have hunting success. Cottages, forest recreation, and tourism may also exhibit this mismatch because they depend on the beauty, cultural character, and general appeal of the surrounding landscape. In these cases, the potential for conflict between producers and consumers is high, and there is a need for cross-scale cooperation and management. Because the production of ecosystem services is often unclear or poorly understood, education, social learning, and experimentation will often be needed to enable cross-scale cooperation (Folke et al. 2005, Carpenter et al. 2009, Cumming et al. 2013).

Management ≠ production mismatch

Management mismatches arise because the scale of management does not match the scale at which an ecosystem service is produced. Problems may develop when land managers at smaller or larger scales do not manage land in a way that supports the production of an ecosystem service. For example, water quality is produced at the watershed scale, but there is no effective body governing water quality at that scale in the study region. Actors and rules functioning at other scales may not be able to coordinate themselves to manage the service to produce desired outcomes.

A trade-off mismatch

Trade-off mismatches occur when there are trade-offs between services that are managed at different scales. This category is identified by combining observation scale with analyses of ecosystem service interactions. When ecosystem service production and consumption occur at the same scale, incentives are aligned for effective management, and signals from production provide direct feedback to those who are benefiting from and usually managing those services. However, trade-off mismatches can arise if there are trade-offs between a service being produced and other services that benefit people at different scales. In the study system, farmers have adequate incentives to manage the soil retention of phosphorus in their fields. Phosphorus is a costly input, and farmers are not allowed to increase phosphorus levels in their field above a critical threshold. However, soil retention of phosphorus, which is produced at the site scale, was observed to have trade-offs with water quality, which is produced at the watershed scale. In this case, cross-scale management is needed to reduce this trade-off. Watershed management organizations exist in the study region; however, these organizations are not effectively coordinating water management strategies across scales (Rathwell and Peterson 2012).

Our analytical combination of the concepts of scale mismatch and ecosystem service production and consumption yields some novel insights. Although the consumption > production mismatch is identified in the widely used typology of relationships between ecosystem service production and benefits proposed by Fisher et al. (2009), the production > consumption mismatch is missing from their typology. Similarly, the scale mismatch concept (Cumming et al. 2006) has been applied to scale mismatches between ecological and social processes, but trade-off mismatches that can arise from the mix of scales of production and management among multiple ecosystem services had not been identified. We propose using these additional types of mismatches to evaluate and improve existing or proposed approaches to the management of multiple ecosystem services.

General implications for ecosystem service assessment

To facilitate the relevance and implementation of ecosystem service assessment results by managers, a general principle has emerged to assess ecosystem services at the scale of political or management boundaries (Gitay et al. 2005, Raudsepp-Hearne et al. 2010). Assessment results need to fit the needs of decision makers, but they also need to capture social-ecological complexities. Based on this cross-scale case study, we propose four ways that considerations of scale could be used to improve ecosystem service assessments.

First, the scale of both social and ecological processes should be considered in designing ecosystem service assessments. We propose that in addition to using social-ecological units of analysis, ecosystem service analyses should begin with a quick exploration of the scales at which each ecosystem service of interest is produced, consumed, and managed (see Methods for how to do this). To connect the production of services to their use, scientists need a social-ecological lens to identify how the services are being consumed and managed. Choice of scale should take ecosystem service consumption and management into account, and not just the ecological dynamics of ecosystem services. The scale of ecosystem service consumption can often be identified by looking at ecosystem service management because management tends to occur where there is a demand for the services or a need to manage trade-offs among services. Although such an approach will often not identify all ecosystem service consumption, it provides an effective start to such an assessment.

Second, scale mismatches occur frequently and should be a focus of assessment. Mismatches can be identified informally by comparing what is already known about the scales of ecosystem service processes in a study area and supplemented where necessary with research and consultation. Our typology of scale mismatches can be used to screen ecosystem services. Identifying scale mismatches can focus an assessment on issues or places for intervention in a system, for example areas where management incentives or feedbacks are lacking, or where conflicts are occurring among stakeholders at different scales. Addressing scale mismatches can be difficult, but in at least some cases, solutions to scale mismatches are simple, such as monitoring programs or better communication between producers and managers.

Third, ecosystem services scale differently. Our results suggest that ecosystem services whose production is more evenly distributed will behave more consistently across scales, and those with patchier distributions are more likely to require greater attention when choosing an assessment scale. Some ecosystem services are tightly associated with land cover, for example crop production and forest recreation. Land covers that are extensive tend to change evenly across scales because local configuration does not influence scaling (Turner 2010). Cultural and provisioning ecosystem services that are not associated with extensive land covers, e.g., wild berries, recreation, or hunting, are types of ecosystem services that will likely have unpredictable and very patchy distributions on the landscape. Ecosystem services that are dependent on people’s access to the particular landscape elements, e.g., recreation, hunting, or wild food collection, may also occur in patchy distributions that may not be observed at larger scales. For example, different forms of nature appreciation are possible in areas with unique ecological features but are restricted to areas that are accessible to the public. Mapping is the easiest and most effective way of identifying any ecosystem services with very heterogeneous distributions, but as more ecosystem services are assessed, it will become easier to know what type of ecosystem service distribution to expect in a particular place. If ecosystem services are extremely clustered or sparsely distributed, analysis at some scales will not capture their true patterns. The most appropriate scale for mapping those ecosystem services on the landscape should therefore be decided based on the questions being asked and the type of detail and analysis required.

Fourth, how patterns of multiple ecosystem services change across scales is related to the amount of social-ecological heterogeneity of the landscape. Ecosystem service bundles are clustered across space because similar sets of services are produced in similar landscapes or in particular areas on a landscape. Social institutions, geographic features, and economic dynamics interact to produce different types of social-ecological systems, where different types of ecosystem service bundles can be found. It is only within this social-ecological understanding of the diversity and heterogeneity within a landscape that bundle analysis results can be interpreted. For example, ecosystem services in our study landscape are shaped by distance from Montréal, the river network geography, and the development of cultural centers for recreation, art, and sport. Understanding these social-ecological interactions can help define useful scales of analysis by identifying scales that capture variation in these structures and feedback processes.

CONCLUSION

We present a novel analysis of how the scale of observation in ecosystem service assessment matters. We analyzed patterns of ecosystem services at multiple scales and show that although there is consistency in trade-offs and synergies across scales, changes in the scale of observation of services alters the bundles of ecosystem services that are identified in a landscape. We identified novel potential scale mismatches on the landscape and suggest that these typologies could be used to guide and evaluate other ecosystem service assessments.

As ecosystem services become more entrenched in policy responses to environmental degradation, it is clear that scientists need to provide more precise and relevant information on which to build appropriate policy responses. Understanding at what scale ecosystem services are produced, managed, consumed, and accessed is essential for designing ecosystem service monitoring and management strategies that are effective, accurate, and fair.

RESPONSES TO THIS ARTICLE

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ACKNOWLEDGMENTS

This work was supported by a scholarship from the Natural Sciences and Engineering Research Council of Canada (C. Raudsepp-Hearne) and a Canada Research Chair (G. D. Peterson). We thank the subject editor and the anonymous reviewers for their useful comments, and we are grateful to Toby Harper-Merrett for his constructive feedback and edits.

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Address of Correspondent:
Ciara Raudsepp-Hearne
4867 Henri-Julien
Montréal, Québec H2T 2E2
Canada
ciara.rh@gmail.com
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