Abstract
Maryland’s coastal bays provide habitat for juveniles of many commercially and recreationally important species of shellfish and finfish. Since 1972, the Maryland Department of Natural Resources has conducted the Maryland Coastal Bays Trawl and Seine Survey to monitor the populations of key species. The survey has undergone substantial spatial and methodological changes affecting the interpretation of simple indices of abundance. We developed generalized linear models to standardize the indices of abundance of five commonly caught fish species: Atlantic menhaden Brevoortia tyrannus, weakfish Cynoscion regalis, spot Leiostomus xanthurus, bay anchovy Anchoa mitchilli, and summer flounder Paralichthys dentatus. Density declined significantly since 1972 for menhaden, bay anchovy, and spot in at least one region within the coastal bays. The northern bays had significantly higher densities than the southern bays for all species. Changes in abundance indices of the five species examined were not related to sea grass coverage, temperature, salinity, nitrogen-to-phosphorus ratios, and other habitat variables but were likely a result of stock-wide recruitment processes.
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Acknowledgments
We thank C. Kennedy, S. Doctor, and M. Luisi from Maryland DNR for their help with survey information, as well as T. Miller for reviewing early versions of the manuscript. Thanks are extended to the National Park Service, Water Resources Division, for support for L. Harris, with the funds administered by the North Atlantic Coast Cooperative Ecosystem Studies Unit at the University of Rhode Island. Data collected by the Assateague Island National Seashore (NPS) were provided by B. Sturgis. J.P. was supported by a Chesapeake Biological Laboratory Graduate Education Committee fellowship. This is contribution number 4829 of the University of Maryland Center for Environmental Science.
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Communicated by Wim J. Kimmerer
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Pincin, J., Wilberg, M.J., Harris, L. et al. Trends in Abundance Indices of Fishes in Maryland’s Coastal Bays During 1972–2009. Estuaries and Coasts 37, 791–800 (2014). https://doi.org/10.1007/s12237-013-9735-8
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DOI: https://doi.org/10.1007/s12237-013-9735-8