نتایج جستجو برای: trophic evaluation
تعداد نتایج: 839178 فیلتر نتایج به سال:
There is increasing recognition of the importance of dietary pathways in determining metal body burdens in marine organisms. With a simple kinetic model that requires information about the ingestion rate of an animal and the assimilation efficiency (AE) and efflux rate constant (ke) of a metal following dietary exposure, it is possible to quantitatively predict the trophic transfer and biomagni...
We quantify the trophic positions of subtropical open-ocean zooplankton species using amino acid–specific (AA) stable nitrogen isotopic compositions. We model animal trophic position by computing trophic 15N enrichment of glutamic acid relative to phenylalanine, and find that trophic position for primary copepod consumers (Oithona spp., Neocalanus robustior) and secondary copepod consumers (Ple...
We used stable isotope analysis (SIA) and conventional techniques of diet assessment to determine marine trophic relationships in the Gulf of the Farallones, California, with an emphasis on marine birds. Stable-carbon (SW) and nitrogen (WN) isotopes were obtained from 98 tissue samples of 16 species representing primary and secondary consumers in 1993-1994. The valies of iYT ranged from -2O.i%;...
A parallel, spatially explicit landscape fish population model (ALFISH) was presented here, which is a part of the Across Tropic Level System Simulation (ATLSS) project for freshwater wetlands of the Everglades and Big Cypress Swamp. ALFISH models the impacts of different water management strategies in the South Florida region on the fresh water fish population, which in turn provides the infor...
We analyzed stable isotopes of carbon and nitrogen to investigate the trophic structure of the subtidal food web around the Mingan Islands, northern Gulf of St. Lawrence, eastern Canada. All benthic consumers were enriched in 13C (mean δ13C of –17.1% ) compared to particulate organic matter (POM: –23.3% ). Nitrogen stable isotope ratios ranged from 6% to 14% and the organisms studied fell into ...
Ocean warming can modify the ecophysiology and distribution of marine organisms, and relationships between species, with nonlinear interactions between ecosystem components potentially resulting in trophic amplification. Trophic amplification (or attenuation) describe the propagation of a hydroclimatic signal up the food web, causing magnification (or depression) of biomass values along one or ...
In this paper we show results from numerical simulations carried out with a complex biogeochemical fluxes model coupled with a one-dimensional high-resolution hydrodynamical model and implemented at three different locations of the northern Adriatic shelf. One location is directly affected bythe Po River influence, one has more open-sea characteristics and one is located in the Gulf of Trieste ...
OF DISSERTATION MOLECULAR AND CELLULAR CHARACTERIZATION OF THE DOPAMINE NEURON STIMULATING PEPTIDES Parkinson’s disease, the second most common neurodegenerative disease, is characterized by the loss of dopaminergic neurons within the substantia nigra. Currently, the treatments available for PD are symptomatic treatments that do not stop the progression of the disease. Trophic molecules, such a...
This dissertation, written by Diana Churchill, and entitled Investigating Trophic Interactions of Deep-Sea Animals (Sharks, Teleosts, and Mobile Scavengers) in the Gulf of Mexico Using Stable Isotope Analysis, having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this dissertation and recommend that it be approved. iii DEDICATION To my ...
The Deepwater Horizon oil spill in the Gulf of Mexico in 2010 resulted in record amounts of oil and dispersants that potentially could be circulated far from the spill origin. Research was conducted to examine the possibility of transfer of oil compounds into the marine foodchain. Specifically, the pathway of oil uptake by menhaden in the Gulf of Mexico, a fish that migrates to waters off the c...
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