Cross-shelf and seasonal variation in larval fish assemblages on the southeast United States continental shelf off the coast of Georgia

Marancik, Katrin E. and Clough, Lisa M. and Hare, Jonathan A. (2005) Cross-shelf and seasonal variation in larval fish assemblages on the southeast United States continental shelf off the coast of Georgia. Fishery Bulletin, 103(1), pp. 108-129.

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Abstract

Seasonal and cross-shelf patterns were investigated in larval fish assemblages on the continental shelf off the coast of Georgia. The influence of environmental factors on larval distributions also was examined, and larval transport processes on the shelf were considered. Ichthyoplankton and environmental data were collected approximately every other month from spring 2000 to winter 2002. Ten stations were repeatedly sampled along a 110-km cross-shelf transect, including four stations in the vicinity of Gray’s Reef National Marine Sanctuary. Correspondence analysis (CA) on untransformed community data identified two seasonal (warm weather [spring, summer, and fall] and winter) and three cross-shelf larval assemblages (inner-, mid-, and outer-shelf ). Five environmental factors (temperature, salinity, density, depth of the water column, and stratification) were related to larval cross-shelf distribution. Specifically, increased water column stratification was associated with the outer-shelf assemblage in spring, summer, and fall. The inner shelf assemblage was associated with generally lower temperatures and lower salinities in the spring and summer and higher salinities in the winter. The three cross-shelf regions indicated by the three assemblages coincided with the location of three primary water masses on the shelf. However, taxa occurring together within an assemblage were transported to different parts of the shelf; thus, transport across the continental shelf off the coast of Georgia cannot be explained solely by twodimensional physical factors.

Item Type: Article
Title: Cross-shelf and seasonal variation in larval fish assemblages on the southeast United States continental shelf off the coast of Georgia
Personal Creator/Author:
CreatorsEmail
Marancik, Katrin E.
Clough, Lisa M.
Hare, Jonathan A.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 103
Number: 1
Page Range: pp. 108-129
Date: 2005
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 9645
Depositing User: Patti M. Marraro
Date Deposited: 13 Aug 2012 16:10
Last Modified: 13 Aug 2012 16:11
URI: http://aquaticcommons.org/id/eprint/9645

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