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VIMS Articles

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Spatiotemporal Trends And Drivers Of Fish Condition In Chesapeake Bay, Robert J. Latour, James Gartland, Christopher F. Bonzek Sep 2017

Spatiotemporal Trends And Drivers Of Fish Condition In Chesapeake Bay, Robert J. Latour, James Gartland, Christopher F. Bonzek

VIMS Articles

Measures of condition in fishes are often used to assess the general well-being of fish populations since condition reflects the biotic and abiotic factors experienced by individuals over moderate time scales. Fish condition can also be used as an indicator of ecosystem suitability in the context of ecosystem-based management. From an ecosystem perspective, evaluation of fish condition is best described over multiple spatiotemporal scales and in a multi-species context. This study analyzed 14 yr (2002-2015) of fisheries-independent trawl survey data to evaluate trends in condition for 16 demersal fishes inhabiting Chesapeake Bay, the largest estuary in the USA. Seasonal and ...


Dimensions Of Biodiversity In Chesapeake Bay Demersal Fishes: Patterns And Drivers Through Space And Time, Jonathan S. Lefcheck, Andre Buchheister, Katie May Laumann, Mark A. Stratton, Kathryn L. Sobocinski, Soloman Chak, Todd R. Clardy, Pamela L. Reynolds, Robert J. Latour, Emmett J. Duffy Jan 2014

Dimensions Of Biodiversity In Chesapeake Bay Demersal Fishes: Patterns And Drivers Through Space And Time, Jonathan S. Lefcheck, Andre Buchheister, Katie May Laumann, Mark A. Stratton, Kathryn L. Sobocinski, Soloman Chak, Todd R. Clardy, Pamela L. Reynolds, Robert J. Latour, Emmett J. Duffy

VIMS Articles

Biodiversity has typically been described in terms of species richness and composition, but theory and growing empirical evidence indicate that the diversity of functional traits, the breadth of evolutionary relationships, and the equitability with which individuals or biomass are distributed among species better characterize patterns and processes within ecosystems. Yet, the advantages of including such data come at the expense of measuring traits, sequencing genes, and counting or weighing individuals, and it remains unclear whether this greater resolution yields substantial benefits in describing diversity. We summarized a decade of high-resolution trawl data from a bimonthly trawl survey to investigate spatial ...


Patterns And Drivers Of The Demersal Fish Community Of Chesapeake Bay, Andre Buchheister, Christopher F. Bonzek, James Gartland, Robert J. Latour Jan 2013

Patterns And Drivers Of The Demersal Fish Community Of Chesapeake Bay, Andre Buchheister, Christopher F. Bonzek, James Gartland, Robert J. Latour

VIMS Articles

Large-scale research on the environmental, biological, and anthropogenic drivers of fish distributions, abundances, and community structure can identify patterns and trends within systems, provide mechanistic insight into ecosystem functioning, and contribute to ecosystembased fisheries management. This study synthesized 10 yr of extensive fisheries-independent bottom trawl data (2002 to 2011) to evaluate drivers of demersal fish community structure in Chesapeake Bay, the largest estuary in the United States. Changes in community composition were assessed using constrained correspondence analysis. Also, aggregate community metrics (species richness, Simpson diversity, and catch-per-unit-effort [CPUE] of species groups) were modeled using generalized additive models. Five species (Atlantic ...


Estimation Of Bottom Trawl Catch Efficiency For Two Demersal Fishes, The Atlantic Croaker And White Perch, In Chesapeake Bay, Joel C. Hoffman, Chris F. Bonzek, Robert J. Latour Jan 2009

Estimation Of Bottom Trawl Catch Efficiency For Two Demersal Fishes, The Atlantic Croaker And White Perch, In Chesapeake Bay, Joel C. Hoffman, Chris F. Bonzek, Robert J. Latour

VIMS Articles

The use of fisheries-independent trawl survey data to estimate fish abundance in shallow coastal systems can present challenges for producing reliable population estimates. We used hydroacoustic and trawl data to estimate the catch efficiency of a demersal trawl that is presently used in surveys to support stock assessments in Chesapeake Bay, USA. Specifically, we determined the efficiency of catching Atlantic croakers Micropogonias undulatus and white perch Morone americana, two of the most common species captured in the trawl survey. Monotypic hauls (>90% by abundance) from 2003 to 2004 were used to estimate catch efficiency, defined as the ratio of the ...