The Distribution of Juvenile Fishes in Maryland Coastal Bays in Relation to Environmental Factors: a Multivariate Analysis

Murphy, Robert F. and Secor, David H. (2005) The Distribution of Juvenile Fishes in Maryland Coastal Bays in Relation to Environmental Factors: a Multivariate Analysis. Solomons, MD, University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory, (Technical Series, 494-05)

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Abstract

Fish assemblage structure of Maryland's coastal lagoon complex was analyzed for spatial and seasonal patterns for the period 1991-2000. Data was made available by Maryland Department of Natural Resources from their MD Coastal Bays Finfish Survey. Dominant species from separate trawl and wiw surveys included blue crab Callinectes sapidus (erroneously included here as a "fish" due to its dominance and commercial importance), bay anchovy Anchoa mitchilli, spot Leiostomous xanthurus, silver perch Bairdiella ehrysoura, and Atlantic menhaden Brevwrtia tyrannus. Ninety-four fish species were identified in the two surveys, a diversity substantially higher than other survey records for Middle Atlantic Bight estuarine and lagoon systems (richness=26 to 78 species). Total species richness for the trawl survey was highest in Chincoteague and lowest in Assawoman and Sinepuxent. On the other hand, mean richness per tow (-area) and related Shannon Weiner Diversity Index were significantly higher in the northern two bays (Assawoman and Isle of Wight Bays) than in the two southern bays (Chincoteague or Sinepuxent Bays). For the seine survey, effort-adjusted diversity indices were significantly lower for Chincoteague Bay than for the other three bays. Higher relative abundances were observed in the northern bays than in the southern bays. The trawl survey exhibited the lowest catch-per-site in Sinepuxent Bay and the highest in Assawoman Bay. The seine survey had the lowest catch-per-site in Chincoteague Bay while the other three embayments were of similar magnitude. There was clear seasonality in assemblage structure with peak abundance and diversity in the summer compared to other seasons. Blue crabs in particular showed a c. 2-fold decline in relative abundance from early summer to fall, which is likely attributable to harvest removals (i.e., an exploitation rate of c. 50%). Seagrass coverage, although increasing over the course of the 10 year survey, did not have obvious effects on species diversity and abundance across or within the embayments, although it did have positive associations with two important species: bay anchovy and summer flounder Pavalich thys dentatus. Atlantic menhaden were most dominant in Assawoman Bay, which could be related to higher primary production typically observed in this Bay in comparison to the other three. (PDF contains 99 pages)

Item Type: Monograph or Serial Issue
Title: The Distribution of Juvenile Fishes in Maryland Coastal Bays in Relation to Environmental Factors: a Multivariate Analysis
Personal Creator/Author:
CreatorsEmail
Murphy, Robert F.
Secor, David H.
Series Name: Technical Series
Number: 494-05
Date: 2005
Publisher: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Place of Publication: Solomons, MD
Funders: Maryland Sea Grant, Maryland Coastal Bays Program
Issuing Agency: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Additional Information: UMCES-CBL-05-092
Uncontrolled Keywords: Juvenile fish; Maryland; Coastal Bays; Environmental factors; Multivariate analysis;
Subjects: Ecology
Fisheries
Environment
Item ID: 3039
Depositing User: Kathleen Heil
Date Deposited: 29 Mar 2010 22:07
Last Modified: 29 Sep 2011 18:00
URI: http://aquaticcommons.org/id/eprint/3039

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