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Anthony, A., J. Atwood, P. August, C. Byron, S. Cobb, C. Foster, C. Fry, A. Gold, K. Hagos, L. Heffner, D. Q. Kellogg, K. Lellis-Dibble, J. J. Opaluch, C. Oviatt, A. Pfeiffer-Herbert, N. Rohr, L. Smith, T. Smythe, J. Swift, and N. Vinhateiro. 2009. Coastal lagoons and climate change: ecological and social ramifications in U.S. Atlantic and Gulf coast ecosystems. Ecology and Society 14(1): 8. [online] URL: http://www.ecologyandsociety.org/vol14/iss1/art8/
Synthesis Coastal Lagoons and Climate Change: Ecological and Social Ramifications in U.S. Atlantic and Gulf Coast Ecosystems
1University of Rhode Island
Lagoons are highly productive coastal features that provide a range of natural services that society values. Their setting within the coastal landscape leaves them especially vulnerable to profound physical, ecological, and associated societal disturbance from global climate change. Expected shifts in physical and ecological characteristics range from changes in flushing regime, freshwater inputs, and water chemistry to complete inundation and loss and the concomitant loss of natural and human communities. Therefore, managing coastal lagoons in the context of global climate change is critical. Although management approaches will vary depending on local conditions and cultural norms, all management scenarios will need to be nimble and to make full use of the spectrum of values through which society views these unique ecosystems. We propose that this spectrum includes pragmatic, scholarly, aesthetic, and tacit categories of value. Pragmatic values such as fishery or tourism revenue are most easily quantified and are therefore more likely to be considered in management strategies. In contrast, tacit values such as a sense of place are more difficult to quantify and therefore more likely to be left out of explicit management justifications. However, tacit values are the most influential to stakeholder involvement because they both derive from and shape individual experiences and beliefs. Tacit values underpin all categories of social values that we describe and can be expected to have a strong influence over human behavior. The articulation and inclusion of the full spectrum of values, especially tacit values, will facilitate and support nimble adaptive management of coastal lagoon ecosystems in the context of global climate change.
Key words: climate change; coastal lagoons; ecosystems; social values
Coastal lagoons support a range of natural services that are highly valued by society (Gönenç and Wolflin 2005), including fisheries productivity, storm protection, tourism, and others. We review how global climate change (GCC) will affect the physical structure, ecological characteristics, and social values associated with lagoons, with special emphasis on the U.S. Atlantic and Gulf of Mexico coasts.
This review follows similar ecosystem-specific assessments of the impacts of climate change in marine and coastal environments such as those of tropical coral reefs (Hoegh-Guldberg et al. 2007), Amazonian forests (Malhi et al. 2008), and city ecosystems (Grimm et al. 2008). We summarize the key characteristics of lagoons in terms of their physical and ecological properties. We review the social values of lagoons and offer a nomenclature to frame discussion about these values. Although there is considerable literature on the physical and ecological dimensions of lagoons, there is much less literature focused on their economic and social values. Finally, we discuss how the physical, ecological, and social dimensions of lagoons are likely be impacted by GCC in the coming decades. Examples are presented from four geographically and culturally distinct lagoon ecosystems to illustrate the range of possible impacts of GCC.
Climate change is only one of many sources of disturbance to lagoon ecosystems, and these disturbances occur concurrently at multiple temporal and spatial scales. Whereas some climate change stressors manifest slowly over decades and on regional and continental spatial scales, local, site-specific stressors can occur rapidly and cause significant impacts to lagoons. Land-use change, freshwater withdrawal from ground and surface water sources, sedimentation, point and nonpoint water pollution, shoreline hardening, and overfishing are examples of anthropogenic stressors that can have profound and sudden impacts on coastal ecosystems (U.S. Environmental Protection Agency 2007, Khan 2007, Rodriguez et al. 2007, Bilkovic and Roggero 2008, Hollister et al. 2008a,b,). Interactions among the host of local stressors and GCC can also be important, but interactions are complex and highly site specific (e.g., Lloret et al. 2008). It is a major challenge for coastal researchers and managers to understand the interactions among these multiscale stressors (Vinebrooke et al. 2004). These important issues are beyond the scope of our review. Instead, we restricted our focus to examine long-term social and ecological effects of GCC-induced changes to lagoon ecosystems.
Physical characteristics of lagoons
A coastal lagoon is a “shallow coastal water body separated from the ocean by a barrier, connected at least intermittently to the ocean by one or more restricted inlets” (Kjerfve 1994; Fig. 1). For our purposes, we restricted our survey to lagoons separated from the ocean by a depositional land barrier, excluding coral reef lagoons. With a geographic range stretching from the arctic to the tropics (Nichols and Boon 1994), coastal lagoons are typically found along low-lying coastlines that have a tidal range of < 4 m (Martin and Dominguez 1994). Lagoons constitute 13% of coastal regions globally, range in area from < 0.01 km² to > 10,000 km², and are typically < 5 m deep (Bird 1994, Kjerfve 1994).
Coastal lagoons are formed and maintained through sediment transport processes. Sediment carried by rivers, waves, currents, wind, and tides (Nichols and Boon 1994) accumulates in river and tidal deltas, on marshes and flats where submerged aquatic vegetation slows currents, and on washover fans. The process of sedimentation can eventually fill in lagoons (Nichols and Boon 1994). Lagoon barriers are constantly eroded by waves and wind, requiring continuous sediment deposition to maintain them (Bird 1994).
Water quantity and quality in a lagoon is influenced by the rate at which the lagoon loses or gains water from evaporation, precipitation, groundwater input, surface runoff, and exchange with the ocean (Allen et al. 1981). Lagoon–ocean exchange is driven by tides and wave action (Zimmerman 1981) and is often the largest component of lagoon water balance (Smith 1994). Heat is also lost and gained through exchange with the atmosphere, sediment, and ocean (Smith 1994).
The flushing rate, i.e., the rate at which water enters, circulates through, and exits the lagoon, is a fundamental physical property and controls the retention time of waterborne constituents. Lagoons tend to have low flushing rates because of restricted exchange with the ocean, contributing to high primary productivity and potentially high pollutant concentrations (Spaulding 1994). Determinants of the flushing rate include the size and shape of the lagoon, the level of connectivity with the ocean, tidal range, and freshwater flow (Phleger 1981).
Ecological characteristics of lagoons
Coastal lagoons are highly productive ecosystems. They contribute to the overall productivity of coastal waters by supporting a variety of habitats, including salt marshes, seagrasses, and mangroves. They also provide essential habitat for many fish and shellfish species. For example, seagrass beds are a common feature of soft-substrate lagoons on the Atlantic coast. Where seagrass beds occur, Zostera marina (eelgrass) is the most dominant species from Maine to the Carolinas, whereas Thalassia testudinalinum (turtle grass) is the most dominant species south of the Carolinas (Bertness 2007). Such beds play an important role in influencing the shape and stability of the shoreline, regulating dissolved oxygen (Nixon and Oviatt 1972), and filtering suspended matter (Bertness 2007). They can enhance the biodiversity of a lagoon by providing a physical refuge from predation and also serve as nursery and feeding habitats for a variety of organisms (Heck and Thoman 1984, Harris et al. 2004). On the Atlantic coast, salt marshes are one of the most prevalent habitats in lagoons (Bertness 2007) and are one of the most productive natural vascular plant communities in the world (Whittaker 1975).
Because of their relatively low flushing rates, coastal lagoons are favorable habitats for primary producers (phytoplankton and aquatic plants). Nutrients are transported to lagoons from surface water and groundwater flows and through exchange with the ocean. Because nutrient availability often limits primary productivity, coastal lagoons can foster high rates of primary production, thereby supporting high rates of secondary production compared to other aquatic ecosystems (Nixon 1982, 1995). However, primary production that exceeds the demands of consumers can lead to eutrophication (Valiela et al. 1992). Eutrophication is characterized by excessive phytoplankton and macroalgal blooms and subsequent hypoxia, reduced light penetration (McGlathery 2001, Anderson et al. 2002), stress and die-offs of marine organisms, loss of seagrass beds, changes in food web interactions and community structure, and loss of biodiversity (National Research Council 2000).
Social value characteristics of lagoons
Lagoons and their associated ecosystems are highly valued by society. However, the concept of value has different meanings in different disciplines. Among philosophers, there is debate over whether natural systems possess an intrinsic value of their own that lies outside human determination (Taylor 1986, Rolston 1994, Williams 1994). These are complex philosophical issues that cannot be resolved here; we therefore focus only on manifestations of social values of lagoons.
Because manifestations of social values differ greatly, we organize them into four general categories: pragmatic, scholarly, inspirational, and tacit (Fig. 2). We use the term “social values” to represent a synthesis of these categories. The placement of a manifestation of value within one category does not preclude its effect on or migration into another category. For example, although the economic engine of tourism might manifest itself as a pragmatic form of social value, the appeal of a tourist destination depends on its power to attract individuals, which in turn depends upon inspirational and tacit manifestations of social value such as dramatic scenery, pleasant swimming beaches, or shops selling mementos that capture the highlights of the tourist experience. Thus, the spectrum of four categories is intended to be a practical device for discussing specific manifestations of social value in relation to coastal lagoons.
Pragmatic values are the most tangible manifestations of value and are commonly referred to as “use” values in the policy, management, and economic literature (Cicin-Sain and Knecht 1998). These values reflect the commercial, recreational, and tourism uses of lagoons. Pragmatic values also include ecosystem services that indirectly support human uses. For example, salt marshes provide nursery habitat for juvenile fish that support commercial fisheries and also protect developed shorelines by reducing the impact of severe storms.
Scholarly values are embodied in activities that seek to extend our knowledge about lagoon systems and include scientific inquiry and historical study. Scholarly manifestations often contribute to pragmatic values. For example, a better understanding of lagoons can improve management, potentially increasing commercial fisheries’ catch and tourism revenues. Society also values knowledge for its own sake (Hume 1999). Thus, basic research on ecological, historical, or geological dimensions of lagoon systems provides scholarly value.
Inspirational values are ascribed to creatively productive activities that include photography and landscape painting, as well as settings for films, literature, songs, and other artistic expressions. These artistic creations encompass both personal aesthetic response to natural systems (tacit values) and profit from the sale of resulting artworks (pragmatic value).
Tacit values (Naukkarinen 1998) refer generally to unspoken values and include the enjoyment of scenery, the sounds of waves and shorebirds, and other sensory landscape features. Tacit values also encompass less tangible perceptions such as having a sense of place. In addition, society may ascribe economic existence value (e.g., Krutilla 1967) to an ecosystem irrespective of whether society uses it in any manner (Fig. 3).
Some manifestations of value are more easily quantified than others (National Research Council 2005), increasing the chance of their being considered and weighted more heavily in coastal management. Tacit values present the biggest challenge to quantification because they are implicit and difficult to articulate and therefore are often missing from data sets or surveys. However, they frequently manifest themselves indirectly through market transactions or other economic indicators. Small seaside cottages on stilts, for example, sit alongside lagoons or barrier islands and command million dollar price tags. Such prices reflect the powerful effect of tacit values on coastal waterfront property. The strength of tacit values is clearly evident when people choose to live in areas of high environmental risk such as low-lying coastal landscapes to benefit from aesthetic amenities or the cultural sense of place that these landscapes provide (Couzin 2008).
Inspirational values often yield a quantifiable product with high market value such as a painting, book, or film, or a popular cultural festival. Each example begins with inspirational value, but the end result can be estimated through pragmatic and scholarly means (such as tourism or cinematic criticism), thereby demonstrating the migration of inspirational values into the scholarly and pragmatic.
Social scientists have developed both qualitative and quantitative tools for incorporating all categories of value into management actions. For example, one qualitative approach developed by social scientists is the charrette, which includes unstructured discussions in public meetings (Berke et al. 2006). Quantitative means of measuring value, by contrast, include the revealed preference approaches developed by economists (Freeman 2003). Although it is beyond the scope of our review to discuss these and other methods in detail, we briefly summarize some methods in Table 1, with additional details provided in Appendix 1. Despite this array of tools, the central challenge remains for coastal managers to incorporate the full spectrum of values, even those that are difficult to quantify.
Sea level, temperature, precipitation, and storminess are expected to change significantly with GCC and to impact coastal lagoons directly (Table 2). Indirect impacts such as ocean acidification are important, but there is great uncertainty regarding potential effects on coastal and marine ecosystems (Royal Society 2005); we therefore focus on direct impacts in our review. Although both precipitation and storminess can be severe during certain weather events (e.g., hurricanes, nor’easters), we treat them as separate aspects of climate because they influence lagoons in different ways. Here, we summarize the current state of knowledge regarding these climate change variables and describe how they will likely affect the physical structure, ecological properties, and social values associated with lagoons.
The magnitude, rate, and effects of relative sea level increase will vary regionally because of differences in subsidence (resulting from sediment loading, groundwater withdrawal, or oil extraction), tectonic uplift, isostatic rebound, and the compaction of muddy soils. Reconstructed sea level increase estimates using tidal gauge data from 1870 to 2004 indicate that the historical average (± 95% confidence limits) rate of sea level increase was 1.7 ± 0.3 mm/yr, with significant acceleration measured at 0.013 ± 0.006 mm/yr (Church and White 2006). Satellite observations, however, show that since 1993, the sea level has been increasing at a rate of approximately 3 mm/yr, which is significantly higher than the average over the previous half-century (Cazenave and Nerem 2004). Global sea level increase in the 20th century measured approximately 170 mm (Bindoff et al. 2007) and is expected to increase exponentially in the 21st century as air temperatures continue to increase (Rahmstorf 2007). By 2050, the sea level is expected to have risen approximately 60–330 mm (Union of Concerned Scientists 2006), and by 2100, is expected to have risen by 50–1400 mm above the 1990 level (Rahmstorf 2007), with the potential to increase > 5000 mm within the next millennium (Overpeck et al. 2006).
Accelerated sea level increase is a particular threat to low-lying, shallow-gradient coastal ecosystems. Most barrier-lagoon systems respond naturally to sea level increase by migrating landward along undeveloped shorelines with gentle slopes (Hayes 2005); the retreating shore face profile can remain essentially unchanged as the shoreline retreats landward and upward in response to moderate sea level increases (Bruun 1962). However, with accelerated sea level increase, landward retreat of barriers may not be rapid enough to prevent inundation (Zhang et al. 2004). Hardened shorelines on developed coastlines impede this natural migration and increase the vulnerability of coastal structures to inundation and storm damage (Titus 1998).
As lagoon barriers retreat landward, accelerated sea level increase will lead to steeper and narrower barrier profiles, shortening the length of existing inlets (Bird 1994) and increasing the rate of exchange with the ocean. This will likely increase the barriers’ vulnerability to breaching and the lagoons’ flushing rates (Zimmerman 1981). As lagoons are inundated by seawater, salinity will increase, possibly altering the species composition (Bird 1993, Mackenzie et al. 2007). If a lagoon barrier persists, a sea level increase will also reduce light penetration to submerged aquatic vegetation, reducing the photosynthetic potential of these primary producers and changing the nutrient dynamics such that lagoons may be more susceptible to eutrophication (Lloret et al. 2008).
In the last 100 yr, global air temperature has increased by 0.76 °C and is expected to increase by an additional 1.1–6.4 °C by 2100 (Intergovernmental Panel on Climate Change 2007). Temperature increases will vary regionally and will be modulated by natural climate variation (e.g., Smith et al. 2007, Keenlyside et al. 2008). The greatest warming is expected to occur at high latitudes in winter (Intergovernmental Panel on Climate Change 2007, Serreze et al. 2007).
Changes in air temperature strongly influence the water temperature of slow-moving, shallow water bodies such as coastal lagoons (Turner 2003). The temperature of the world’s oceans has increased, on average, by 0.3 °C (Intergovernmental Panel on Climate Change 2007) and is likely to continue to increase through the next century. Because air temperatures increase more quickly over land than over oceans, coastal water temperatures are also likely to increase more rapidly (Harley et al. 2006). For example, in Narragansett Bay, Rhode Island (median depth 6.4 m; Boothroyd and August 2008), the annual average surface water temperature has increased by 1.1 °C in the past 50 yr (Nixon et al. 2003). This rate of increase is approximately four times greater than that of the ocean. Although we are not aware of published, long-term data for water temperature in coastal lagoons, the shallow nature and low flushing rates of coastal lagoons indicate that water temperatures in lagoons will increase even more rapidly than water temperatures in open estuaries.
Water temperature in turn influences dissolved oxygen concentrations, as well as the physiology of lagoon organisms, species’ ranges, and patterns of migration (Woodward 1987, Turner 2003). Many marine species live near their threshold of thermal tolerance (Tomanek and Somero 1999), at which even small changes in temperature can have large impacts on their viability. In addition, these ecosystems are more susceptible to increases in the colonization of invasive species that may thrive in warmer waters (Stachowicz et al. 2002). As lagoon temperatures increase, dissolved oxygen concentrations are likely to decrease (Bopp et al. 2002, Joos et al. 2003), especially as seasonal stratification of the water column isolates oxygen-depleted deeper waters from oxygen-rich surface waters (Bopp et al. 2002, Joos et al. 2003). Reduced dissolved oxygen adversely affects aerobic biota, with benthic communities expected to be the most severely stressed. In lagoons with high flushing rates, the influx of ocean water will interrupt stratification, causing the water column to mix. In restricted lagoons with low flushing rates and high nutrient inputs, temperature increases will increase the probability and severity of hypoxic events (D’Avanzo and Kremer 1994). Chronic hypoxia in coastal waters has been linked to long-term changes in benthic community structure characterized by a persistent shift in species composition to more hypoxia-tolerant species and an overall decrease in species diversity (Conley et al. 2007).
The timing (phenology) of lagoon processes will also be affected by temperature increases. For example, changes in air temperature have affected the timing and route of migrating birds that traditionally stop over at coastal lagoons (Gatter 1992). Developmental and reproductive timing in shellfish as evidenced by early gonad maturation and spawning in bay scallops is associated with higher water temperatures (Sastry 1963). Changes in plankton phenology have also been observed, with zooplankton becoming active earlier in the year following relatively warm winters (Edwards and Richardson 2004). Increased grazing of phytoplankton by zooplankton has been observed and may partially explain declines in phytoplankton abundance associated with warmer temperatures (Oviatt 2004). Warmer temperatures are also thought to contribute to observed declines in seagrass abundance (Blintz et al. 2003).
There is general agreement that there will be changes in precipitation intensity, timing, volume, and form (snow or rain) because of GCC (Meehl et al. 2007). Estimates of the magnitude and timing of changes in precipitation patterns along the U.S. Atlantic and Gulf coasts are variable, reflecting the high level of uncertainty associated with these predictions (Graham et al. 2007). Although predictions agree that there will be an increase in extreme rainfall events and drought–flood cycles (Scavia et al. 2002, Committee on Environment and Natural Resources 2008), disagreement persists regarding the direction of expected changes in other components of the water cycle such as stream flow (timing and volume), evapotranspiration, soil moisture, and groundwater storage resulting from complex interactions between and among factors such as air temperature and seasonal timing of precipitation events.
Regional changes in precipitation patterns can have important effects on the physical and ecological characteristics of coastal lagoons through the alteration of freshwater inputs and associated changes in salinity and dissolved oxygen concentrations (Milly et al. 2005). Intense precipitation events would increase short-term freshwater inputs (Paerl et al. 2006) while locally decreasing salinity (Michener et al. 1997). Conversely, lower precipitation would reduce freshwater inputs and potentially result in higher salinity (Valiela 1995). Salinity would also be affected by changes in flushing rate, which may counteract the changes in freshwater inputs. Increased freshwater inputs can also contribute to the stratification of deeper lagoons (Justic et al. 1996), increasing the risk of hypoxia in bottom waters (Bopp et al. 2002, Joos et al. 2003). The expected increase in the variability and intensity of precipitation events is therefore expected to produce increased variability, both spatially and temporally, in salinity and dissolved oxygen concentrations in coastal lagoons.
Other effects of increased surface water inputs include the increased delivery of sediment and nutrients to lagoons (Orpin et al. 1999). Increased nutrient inputs may accelerate the eutrophication of lagoons, especially those with low flushing rates (McComb 1995, Wazniak et al. 2007). As with sea level increases, increased turbidity will reduce light penetration and the photosynthetic activity of submerged aquatic vegetation, compounding the risk of eutrophication as nutrient dynamics are further altered (Lloret et al. 2008). In addition, reduced light penetration can inhibit the feeding ability of visual predators (Howick and O’Brien 1983, Fiksen et al. 2002, Horppila et al. 2004).
Storms affect lagoons through overwash events and by erosion from wind and waves. There is disagreement among predictions concerning the extent and magnitude of changes in storminess with GCC. Evidence of an increase in intense tropical cyclone activity in the North Atlantic over the past 40 yr (Meehl et al. 2007, Trenberth et al. 2007) supports predictions that the frequency (Holland and Webster 2007, Mann et al. 2007) and intensity (Emanuel 2005, Webster et al. 2005) of extreme weather events have been increasing and will continue to increase with warmer global temperatures. However, these predictions have been challenged by suggestions that the apparent trend in increasing storm frequency is an artifact of improved monitoring (Landsea 2007) and by predictions that increased vertical wind shear could dampen the effects of increasing hurricane intensity (Vecchi and Soden 2007). Meehl et al. (2007) suggest that a warmer climate will increase the overall intensity of tropical cyclones and, whereas the number of storms is expected to decrease globally by the end of the 21st century, the number of storms in the North Atlantic could increase by as much as 34% during this period (Oouchi et al. 2006).
The consequences of sea level increase become acute during storm events because sea level increase and storms interact to erode barriers and produce high storm surges, rapidly redistributing barrier sediment (Fenster and Dolan 1993). During periods of high storm surge, water moves rapidly over the barrier in a process called overwash, which delivers sediment eroded from the front of the barrier onto the back barrier flat and into the lagoon (Wilby et al. 1939, Leatherman 1981). Increased storm intensity will likely cause more frequent breaches of barrier islands (Morton and Sallenger 2003), which in turn will increase the rate of exchange with the ocean and consequently the flushing rate and salinity of lagoons (Bird 1994, Smith 1994).
The combined effects of increased temperature, sea level, and storminess and the variability in weather patterns will likely stress human communities that value the presence of particular lagoons. Lagoons are valued for many reasons: as ecosystems that support an abundance of species on which livelihoods depend (pragmatic), as sites of historical tradition (scholarly), as incentive for creative pursuits (inspirational), and as a source of a sense of place (tacit).
When faced with GCC stressors, society may take actions to reduce impacts. However, these actions may also have unintended consequences, creating a feedback cycle that can have long-term negative consequences. For example, people have historically reacted to coastal erosion by hardening shorelines with sea walls or riprap. Hardened shorelines may protect coastal structures in the short term, but they can exacerbate erosion elsewhere by reducing sources of sand to replenish shorelines downcoast.
To explore how particular social structures and physical and ecological characteristics are likely to be impacted by GCC in the coming decades, we examined four specific lagoon systems on the Atlantic and Gulf coasts: the Gulf Coast of Louisiana, the salt ponds of Rhode Island, the Outer Banks and Lowcountry of the Carolinas, and Jamaica Bay, New York (Fig. 4). Table 3 provides a brief summary of the socio-geographic settings of the four lagoon systems, as well as key GCC factors and some likely ecosystem impacts. These lagoons were selected to cover a broad geographic range and include systems with distinct human development patterns and a variety of social values.
Gulf Coast of Louisiana
Coastal Louisiana is a vast rural complex of lagoons, bayous, canals, channels, and small embayments that are particularly vulnerable to sea level increase (Burkett et al. 2003). These coastal lands are disappearing at a rate of up to 100 km²/yr because of the combined effects of sea level increase, hurricanes, subsidence, and erosion (United States Geological Survey National Wetlands Research Center, LaCoast: http://www.lacoast.gov). Without abatement, an additional 3200 km² of wetlands are predicted to be inundated by 2040, advancing the Louisiana shoreline inland by as much as 53 km in some areas. These losses are caused in part by human actions in response to flooding threats, including increased channelization of the Mississippi River with levees, which has controlled flooding, but has also cut off sediment supply to delta wetlands and has diverted sediments to deep waters off the continental shelf. This has exacerbated the effects of sea level increase with significant negative impacts on barrier islands and wetlands (Dean 2006).
Coastal Louisiana’s lagoons and wetlands are spawning, nursery, and fishing grounds for many important fisheries. For example, shrimp landings in Louisiana constitute roughly 30% of the ex-vessel value of the national shrimp catch (National Marine Fisheries Service annual commercial landing statistics: http://www.st.nmfs.noaa.gov/st1/commercial/landings/annual_landings.html). Sea level increase will intensify the loss of critical salt marsh habitat (Mendelssohn and McKee 1988, Wilsey et al. 1992, Ogburn and Alber 2006). Flooding from sea level increase will increase salinity and may stress juvenile shrimp that mature in low-salinity estuarine waters (Gunter 1961). The shrimp fishery has significant pragmatic value in this region and is also a unique way of life that embodies inspirational and tacit values.
Louisiana’s Barataria Bay (Fig. 4) sustains rich biodiversity by providing not only important habitat for waterfowl, shrimp, and finfish, but also serving as homeland to several cultures, creating a unique sociological phenomenon in which highly diverse communities (Houma, Cajun, Creole, African-American, Vietnamese, and Canary Island Spaniards) share a single ecosystem (Gomez 1998, Tidwell 2003, Gramling and Hagelman 2005). These cultures share a high degree of poverty or economic uncertainty, leaving them more vulnerable to the effects of GCC (Rosenzweig et al. 2007).
Moreover, the inundation of Louisiana’s coastal lagoons increases the vulnerability of New Orleans to flooding, risking the loss of one of the world’s iconic cities and the living culture that produced jazz, one of America’s indigenous art forms (Gushee 1994). With the loss of these coastal lagoons, a powerful experience of place is also lost, existing only in nostalgic representations preserved in artworks such as those of Colette Pope Heldner (Fig. 5A) and John James Audubon or the writings of James Lee Burke.
Salt ponds of Rhode Island
The string of lagoons along the south shore of Rhode Island are known locally as salt ponds and figure prominently in a complex landscape of highly developed residential areas, commercial waterfronts, agricultural areas, and uninhabited protected refuges (Fig. 3). These lagoons have historically played an important role in Native American culture, and contemporary human uses include commercial and recreational fishing, boating, birding, surfing, and photography (Fig. 4). Local communities depend upon the fishing industry, and these lagoons provide habitat for a variety of commercially important shellfish and finfish.
Rhode Island’s salt ponds are currently under heavy pressure from residential development. Past construction of stabilized breachways dramatically altered the salinity in many of these lagoons, shifting the lagoon community from brackish species (alewives, smelt, oysters) to species that thrive in more saline conditions (e.g., quahogs, winter flounder; Lee 1980) and are viewed as pragmatically valuable to local communities. Sea level increase will likely increase the lagoons’ salinity through breaching of barriers, promoting another shift in species composition. Temperature increases and reduced water clarity will be detrimental to eelgrass beds and will impede restoration efforts to increase the areal extent of these submerged aquatic vegetation habitats (Short and Neckles 1999). Storminess and sea level increase are of particular concern because hard-edged coastal development (i.e., permanent structures) restricts the migration of barrier and headland shorelines (Lee 1980). Pragmatic values will be impacted through property loss (Donnelly and Bertness 2001) as shorelines continue to shift because of sea level increase and increased storm intensity. Impacts are compounded because real estate on lagoons is some of the most expensive property in these coastal communities. The means for the continued survival of the salt ponds is limited by attempts to protect structures through the hardening of lagoon shorelines, yet another example of feedback between social and ecological systems. The potential loss of Rhode Island’s salt ponds also threatens the sense of place that inspires significant artistic enterprise, e.g., landscape painting (John Lutes), cartooning (Don Bosquet), and literature (Spartina by John Casey 1989), as well as birding and the seasonal pilgrimage of tourists to beaches along barriers.
Outer Banks and Lowcountry of the Carolinas
The Carolina Outer Banks are barrier spits that separate a large estuarine system, including Pamlico Sound, the largest Atlantic coastal lagoon, from the Atlantic Ocean (Bailey 1999; Fig. 4). The Carolina Lowcountry consists of a series of lagoons and waterways that extend along the South Carolina coast. Both systems provide habitat for migratory birds, halophilic grasses, finfish, and shellfish (Frankenberg 1997). The Outer Banks and Lowcountry are a transitional cultural setting in which the wealthy compete for coastal land with poorer communities of longstanding historical importance. Islands off the South Carolina coast have been home to generations of African Americans in a unique sea-island culture known as the Gullah in South Carolina and Geechee in Georgia. Gullah-populated islands, including Edisto Island, Coosaw Island, St. Helena Island, and Daufuskie Island, served as the inspiration for the fictional Yamacraw Island in Pat Conroy’s (1972) The Water is Wide. The Gullah culture inspired Julia Peterkin’s (1928) Pulitzer Prize winning novel Scarlet Sister Mary and the paintings of John W. Jones (Fig. 5B). These works exemplify scholarly and inspirational values (Halfacre et al. 2007).
Sea level increase threatens the low-elevation barriers in this region and will change the hydrology and salinity of the lagoons. The catchment area draining into this lagoon system is relatively large compared to the area of the lagoons (Dame et al. 2000), intensifying the effect of increased precipitation. Nutrients carried with higher freshwater flows increase the likelihood of eutrophication (Rogers and McCarty 2000), affecting not only pragmatic values associated with fisheries and real estate, but also inspirational and tacit values. These coastal lagoons, including traditional Gullah lands, are threatened by residential and commercial development, which will in turn be threatened by inundation from hurricanes and sea level increase. Residents of low socioeconomic status may not have the capacity to evacuate flood-prone areas during extreme storm events, as was the case with many New Orleans communities during Hurricane Katrina in 2005 (Chakraborty et al. 2005, Lie 2006). Under current climate change projections, the delicate balance between local cultural groups and their lagoon landscapes will be severely disrupted, with the potential for permanent displacement of a singular indigenous culture and language unique to the Gullah (Jarrett and Lucas 2002). A GCC-induced diaspora will diminish the related scholarly, inspirational, and tacit values of these lagoons. In addition, pragmatic and scholarly values are at risk from erosion, sea level increase, hurricanes, and storm surge that threaten significant archaeological sites and other historic landmarks such as the Cape Hatteras lighthouse (Watts 1975, Babits 2002). Contrary to the traditional strategy of responding to coastal erosion by hardening shorelines, protection of the Cape Hatteras lighthouse was achieved through relocation in 1999 (National Research Council 1988, North Carolina State University 1997).
Jamaica Bay, New York
Jamaica Bay is a coastal lagoon located in one of the most densely developed urban settings in the United States (Fig. 4) and represents the largest natural open space in New York City. As part of the Gateway National Recreation Area (U.S. National Park Service), Jamaica Bay hosts > 6 million visitors annually (Hoffman 2006) and provides habitat for > 300 species of migratory and resident birds (Brown et al. 2001), as well as spawning grounds for horseshoe crabs (Botton et al. 2006). The lagoon provides urban residents direct access to a relatively undeveloped natural world and is a living classroom for schoolchildren involved in National Park Service sponsored curricula that link classroom science activities with natural ecosystems.
The salt marshes of Jamaica Bay that provide prime habitat have been receding at an accelerating pace (Hartig et al. 2002). Although activities such as channel dredging and heavy boat traffic have likely contributed to short-term marsh loss, encroaching sea level increase and increased storminess present long-term hazards to Jamaica Bay’s lagoon system (Gornitz et al. 2002). As GCC impacts unfold, urban residents could lose the tacit benefits of this contrasting land and lagoonscape and the calming effects of ambient natural sights, sounds, and textures (Foster 1998).
GCC-induced physical and ecological changes to coastal lagoons will force both natural and human communities to adapt. Natural communities may respond in a variety of ways: shifts in community composition and diversity, susceptibility to eutrophication and disease, and localized loss of some native species. However, the ability of natural communities to adapt successfully to changing conditions will be influenced by human actions. For example, proactive protection of undeveloped land surrounding coastal lagoons gives natural communities a better chance for survival through habitat migration, whereas continued shoreline development impedes ecosystem adaptation by limiting salt marsh migration. The former acknowledges and attempts to sustain the complex interaction between human and natural systems, whereas the latter leaves society vulnerable to the loss of the full spectrum of values associated with lagoon ecosystems.
Human communities will necessarily respond to immediate threats and may also plan for anticipated impacts. In the face of these potential impacts, the effective management of coastal lagoons requires an understanding of the social, physical, and ecological processes that collectively influence how lagoons are affected by GCC. Social values such as the desire to preserve a seaside community and its associated way of life may drive responses that produce feedback in lagoon ecosystems. This feedback may be counterproductive for both natural and human communities. Attention to the full spectrum of social values is more likely to prompt the consideration of the widest range of ramifications of any course of action or inaction.
However, management strategies, even those that are ecosystem based, currently do not incorporate quantification of the full spectrum of social values. Because pragmatic values are the easiest to quantify and appear to be more absolute and persuasive than other values, they are weighed most heavily in management decisions. By contrast, tacit values are much more difficult to quantify and are often overlooked in coastal management decisions. Ironically, tacit values are the most influential to stakeholders because they both derive from and shape individual experiences and beliefs. They also underpin the full spectrum of social values and can be expected to have strong influence over human behavior. Furthermore, the consideration of tacit values promotes civic engagement in coastal management decision making because these values intersect with the interests and needs of all concerned, regardless of their social, political, or economic influence (Millennium Ecosystem Assessment 2005).
Tools that articulate and quantify tacit values are needed to provide a more balanced data set to coastal managers. The development and interpretation of such tools is dependent upon an interdisciplinary approach that incorporates knowledge both in and beyond the science community (Leslie and McLeod 2007). Fragile coastal lagoons and the societies that depend on them present particularly complex challenges because they are on the frontline facing the most immediate effects of climate change. An appeal to tacit values, which are fundamental to the human experience, may better engage society as managers strive to develop and implement mitigation or adaptation strategies.
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ACKNOWLEDGMENTSThis research was sponsored by NSF IGERT grant # 0504103 to the University of Rhode Island Coastal Institute. We are grateful to John King, Scott Nixon, Stephen Olsen, Charles Roman, Barry Sullivan, Virginia Lee, Erika Lentz, Barry Costa-Pierce, James Boyd, and Janet Freedman for their help and advice in developing this paper. Our use of the painting of the “Gullah Fisherman" by John W. Jones (author and artist of Confederate Currency: The Color of Money, Images of Slavery in Confederate and Southern States Currency) is used with permission. We thank Nate Dibble for preparing the illustration of a coastal lagoon.
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