Three Decades of Change in Demersal Fish and Water Quality in a Long Island Sound Embayment
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Estuaries are impacted by multiple anthropogenic stressors from eutrophication to climate change. Long-term observational datasets allow the determination of trends in estuarine indicators and the prediction of future conditions. Here, a dataset of water quality and demersal fish community composition in a Long Island Sound embayment (Norwalk Harbor, Connecticut) from 1987 to 2016 was examined. Mean water column water temperature increased, dissolved oxygen decreased, and salinity increased over the study period, with simultaneous changes in the demersal fish community. Fish abundance declined overall, with declines in CPUE observed across multiple species including the commercially important winter flounder (Pseudopleuronectes americanus). As fish can serve as effective indicators of estuarine health, these changes suggest a negative shift in the health of this Long Island Sound embayment. Climate change presents an increasing threat to estuaries and the ecosystem services they provide, especially when coupled with other anthropogenic stressors. Management actions are needed at multiple spatial scales, from local to global, to combat these threats to estuarine health.
KeywordsEstuaries Demersal fish Climate change Winter flounder Long Island Sound
The authors wish to thank Penny Howell, Norm Bloom, Sue Steadham, the Wilton High School Marine Biology Club, and the dozens of student and adult volunteers who participated in the collection and analysis of the fish and water quality data over the study period.
Funding was provided by Copps Island Oysters, Jeniam Foundation, Social Venture Partners of Connecticut, Hillard Bloom Shellfish, King Industries, Norwalk River Watershed Association, Newman’s Own Foundation, NRG—Devon, Soundsurfer Foundation, Trout Unlimited—Mianus Chapter, Long Island Sound Futures Fund, Elizabeth Raymond Ambler Trust Foundation, Adolph and Ruth Schnurmacher Foundation, Daphne Seybolt Culpeper Foundation, Fairfield County’s Community Foundation, New Canaan Community Foundation, Coastwise Boatworks, 11th Hour Racing Foundation, and Horizon Foundation, and the generosity of individual donors.
- Beck, M.W., K.L. Heck, K.W. Able, D.L. Childers, D.B. Eggleston, B.M. Gillanders, B. Halpern, C.G. Hays, K. Hoshino, T.J. Minello, R.J. Orth, P.F. Sheridan, and M.P. Weinstein. 2001. The identification, conservation, and management of estuarine and marine nurseries for fish and invertebrates. Bioscience 51 (8): 633.CrossRefGoogle Scholar
- Bigelow, H.B., and W.G. Schroeder. 1953. Fishes of the Gulf of Maine. Fishery Bulletin of the Fish and Wildlife Service 53: 577.Google Scholar
- Brett, J.R. 1970. Temperature: Fishes. In Marine ecology, ed. O. Kinne, vol. 1, 515–560. London: Wiley.Google Scholar
- City of Norwalk Water Pollution Control Authority. 2012. City of Norwalk Water Pollution Control Authority Meeting Minutes for April 16: 2012.Google Scholar
- Collins, M., R. Knutti, J. Arblaster, J.-L. Dufresne, T. Fichefet, P. Friedlingstein, X. Gao, W.J. Gutowski Jr., T. Johns, G. Krinner, M. Shongwe, C. Tebaldi, A.J. Weaver, and M. Wehner. 2013. Long-term climate change: Projections, commitments and irreversibility. In Climate change 2013: The physical science basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, ed. T.F. Stocker, D. Qin, G.K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex, and P.M. Midgley. Cambridge and New York: Cambridge University Press.Google Scholar
- Colwell, R.K. 2013. EstimateS: Statistical estimation of species richness and shared species from samples. Version 9. User’s Guide and application published at: http://purl.oclc.org/estimates.
- Connecticut Department of Agriculture. 2017. Connecticut shell fishing industry profile. http://www.ct.gov/doag/cwp/view.asp?a=1369&q=316994. Accessed May 9, 2017.
- Deegan, L.A., J.E. Hughes, and R.A. Rountree. 2000. Salt marsh ecosystem support of marine transient species. In Concepts and controversies in tidal marsh ecology, ed. M.P. Weinstein and D.A. Kreeger, 333–365. Dordrecht: Springer Netherlands.Google Scholar
- Kocian, M., A. Fletcher, G. Schundler, D. Batker, A. Schwartz, and T. Briceno. 2015. The trillion dollar asset: The economic value of the Long Island Sound Basin. Tacoma, WA: Earth Economics.Google Scholar
- Levitus, S., J.I. Antonov, T.P. Boyer, O.K. Baranova, H.E. Garcia, R.A. Locarnini, A.V. Mishonov, J.R. Reagan, D. Seidov, E.S. Yarosh, and M.M. Zweng. 2012. World ocean heat content and thermosteric sea level change (0–2000 m), 1955–2010. Geophysical Research Letters 39: L10603.CrossRefGoogle Scholar
- Melillo, J.M., T.C. Richmond, and G.W. Yohe, ed. 2014. Climate change impacts in the United States: The Third National Climate Assessment. U.S. Global Change Research Program.Google Scholar
- Millstone Environmental Laboratory. 2017. Status and Trends: LISS Environmental Indicators. 2017. http://longislandsoundstudy.net/indicator/water-temperature/. Accessed July 17, 2017.
- Murdy, E.O., R.S. Birdsong, and J.A. Musick. 1997. Fishes of Chesapeake Bay. Washington, DC: Smithsonian Institution Press.Google Scholar
- Northeast Fisheries Science Center. 2017. Operational assessment of 19 northeast Groundfish stocks, updated through 2016. doi: 10.7289/V5/RD-NEFSC-17-17.Google Scholar
- Norwalk Water Pollution Control Authority. 2013. Phase I Wastewater Treatment Upgrade – CSO/Wet Weather.Google Scholar
- Pearcy, W.G. 1962. Ecology of an estuarine population of winter flounder, Pseudopleuronectes americanus (Walbaum). Parts I-IV. Bulletin of the Bingham Oceanographic Collection 18: 5–78.Google Scholar
- Pershing, A.J., M.A. Alexander, C.M. Hernandez, L.A. Kerr, A. Le Bris, K.E. Mills, J.A. Nye, N.R. Record, H.A. Scannell, J.D. Scott, G.D. Sherwood, and A.C. Thomas. 2015. Slow adaptation in the face of rapid warming leads to collapse of the Gulf of Maine cod fishery. Science 350: 809–LP-812.CrossRefGoogle Scholar
- Poloczanska, E.S., C.J. Brown, W.J. Sydeman, W. Kiessling, D.S. Schoeman, P.J. Moore, K. Brander, J.F. Bruno, L.B. Buckley, M.T. Burrows, C.M. Duarte, B.S. Halpern, J. Holding, C.V. Kappel, M.I. O’Connor, J.M. Pandolfi, C. Parmesan, F. Schwing, S.A. Thompson, and A.J. Richardson. 2013. Global imprint of climate change on marine life. Nature Climate Change 3 (10): 919–925.CrossRefGoogle Scholar
- Rhein, M., S.R. Rintoul, S. Aoki, E. Campos, D. Chambers, R.A. Feely, S. Gulev, G.C. Johnson, S.A. Josey, A. Kostianoy, C. Mauritzen, D. Roemmich, L.D. Talley, and F. Wang. 2013. Observations: Ocean. In Climate change 2013: The physical science basis. Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change, ed. T.F. Stocker, D. Qin, G.K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex, and P.M. Midgley. Cambridge and New York: Cambridge University Press.Google Scholar
- SAS Institute Inc. 2016. JMP software version 12. Cary, NC: SAS Institute Inc..Google Scholar
- Thomas, A.C., A.J. Pershing, K.D. Friedland, J.A. Nye, K.E. Mills, M.A. Alexander, N.R. Record, R. Weatherbee, and M.E. Henderson. 2017. Seasonal trends and phenology shifts in sea surface temperature on the North American northeastern continental shelf. Elementa Science of the Anthropocene 5.Google Scholar
- U.S. Census Bureau. 2010. Census of population and housing and data file from geography division based on the TIGER/Geographic Identification Code Scheme (TIGER/GICS) computer file. United States Census.Google Scholar