La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Trends in Abundance Indices of Fishes in Maryland's Coastal Bays During 1972-2009
Auteurs :	Jennifer Pincin, Auteur ; Michael J. Wilberg, Auteur ; Lora Harris, Auteur ; Angel Willey, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (37(4) JUL 2014)
Article en page(s) :	791-800
Résumé :	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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