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Full-Text Articles in Aquaculture and Fisheries

Isotopic Incorporation Rates And Discrimination Factors In Mantis Shrimp Crustaceans., Maya Devries, Carlos Del Rio, Tate Tunstall, Todd Dawson Apr 2015

Isotopic Incorporation Rates And Discrimination Factors In Mantis Shrimp Crustaceans., Maya Devries, Carlos Del Rio, Tate Tunstall, Todd Dawson

Faculty Publications, Biological Sciences

Stable isotope analysis has provided insights into the trophic ecology of a wide diversity of animals. Knowledge about isotopic incorporation rates and isotopic discrimination between the consumer and its diet for different tissue types is essential for interpreting stable isotope data, but these parameters remain understudied in many animal taxa and particularly in aquatic invertebrates. We performed a 292-day diet shift experiment on 92 individuals of the predatory mantis shrimp, Neogonodactylus bredini, to quantify carbon and nitrogen incorporation rates and isotope discrimination factors in muscle and hemolymph tissues. Average isotopic discrimination factors between mantis shrimp muscle and the new diet ...


The Relationship Between Ocean-Climate Indices And Diet Of Rhinoceros Auklets (Cerorhinca Monocerata) , Christine Anderson Jan 2013

The Relationship Between Ocean-Climate Indices And Diet Of Rhinoceros Auklets (Cerorhinca Monocerata) , Christine Anderson

Summer Research

Marine system productivity varies as a result of changing ocean-climate indices and cascade through trophic levels, impacting marine mammals and birds. Rhinoceros Auklets (Cerorhinca monocerata) are nesting seabirds in the North Pacific and can indicate variation in marine conditions via diet composition. I will analyze the relationship of Rhinoceros Auklet diets and ocean-climate indices by comparing diet composition and diversity on two islands in differing marine systems. I will also use oceanographic indices to evaluate any correlations between ocean-climate effects and diet variability in populations, providing insights into what physical forcing mechanisms may affect diet, and ultimately reproductive performance, of ...


Assessment Of River Herring And Striped Bass In The Connecticut River: Abundance, Population Structure, And Predator/Prey Interactions, Justin P. Davis, Eric T. Schultz, Jason Vokoun Jan 2009

Assessment Of River Herring And Striped Bass In The Connecticut River: Abundance, Population Structure, And Predator/Prey Interactions, Justin P. Davis, Eric T. Schultz, Jason Vokoun

EEB Articles

Populations of anadromous alewife Alosa pseudoharengus and blueback herring A. aestivalis, collectively referred to as river herring, have declined in the Connecticut River. An explanatory hypothesis for these declines is that predation pressures have increased as a result of recent increases in abundance of sympatric striped bass Morone saxatilis. We sampled river herring and striped bass from the stretch of the Connecticut River between Wethersfield, CT and Holyoke, MA during the vernal migration seasons of 2005-2008. The objectives of the sampling program were to assess abundance, temporal/spatial distribution, and population structure of both river herring and striped bass, as ...