Ichthyoplankton community in the Columbia River plume off Oregon: effects of fluctuating oceanographic conditions

Parnel, Maria M. and Emmett, Robert L. and Brodeur, Richard D. (2008) Ichthyoplankton community in the Columbia River plume off Oregon: effects of fluctuating oceanographic conditions. Fishery Bulletin, 106(2), pp. 161-173.

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Abstract

Ichthyoplankton samples were collected at approximately 2-week intervals, primarily during spring and summer 1999−2004, from two stations located 20 and 30 km from shore near the Columbia River, Oregon. Northern anchovy (Engraulis mordax) was the most abundant species collected, and was the primary species associated with summer upwelling conditions, but it showed significant interannual and seasonal fluctuations in abundance and occurrence. Other abundant taxa included sanddabs (Citharichthys spp.), English sole (Parophrys vetulus), and blacksmelts (Bathylagidae). Two-way cluster analysis revealed strong species associations based primarily on season (before or after the spring transition date). Ichthyoplankton abundances were compared to biological and environmental data, and egg and larvae abundances were found to be most correlated with sea surface temperature. The Pacific Decadal Oscillation changed sign (from negative to positive) in late 2002 and indicated overall warmer conditions in the North Pacific Ocean. Climate change is expected to alter ocean upwelling, temperatures, and Columbia River flows, and consequently fish eggs and larvae distributions and survival. Long-term research is needed to identify how ichthyoplankton and fish recruitment are affected by regional and largescale oceanographic proces

Item Type: Article
Title: Ichthyoplankton community in the Columbia River plume off Oregon: effects of fluctuating oceanographic conditions
Personal Creator/Author:
CreatorsEmail
Parnel, Maria M.
Emmett, Robert L.
Brodeur, Richard D.
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 2
Page Range: pp. 161-173
Date: 2008
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8849
Depositing User: Patti M. Marraro
Date Deposited: 13 Jun 2012 21:59
Last Modified: 14 Jun 2012 17:14
Related URLs:
URI: http://aquaticcommons.org/id/eprint/8849

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