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Physical Sciences and Mathematics Commons™
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Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Coupling Planktonic Ecosystem And Fisheries Food Web Models For A Pelagic Ecosystem: Description And Validation For The Subarctic Pacific, Kelly A. Kearney, Charles Stock, Kerim Aydin, Jorge L. Sarmiento
Coupling Planktonic Ecosystem And Fisheries Food Web Models For A Pelagic Ecosystem: Description And Validation For The Subarctic Pacific, Kelly A. Kearney, Charles Stock, Kerim Aydin, Jorge L. Sarmiento
United States Department of Commerce: Staff Publications
We provide a modeling framework that fully couples a one-dimensional physical mixed layer model, a biogeochemical model, and an upper trophic level fisheries model. For validation purposes, the model has been parameterized for the pelagic Eastern Pacific Subarctic Gyre ecosystem. This paper presents a thorough description of the model itself, as well as an ensemble-based parameterization process that allows the model to incorporate the high level of uncertainty associated with many upper trophic level predator-prey processes. Through a series of model architecture experiments, we demonstrate that the use of a consistent functional response for all predator-prey interactions, as well as …
Estimating The Carrying Capacity Of French Frigate Shoals For The Endangered Hawaiian Monk Seal Using Ecopath With Ecosim, Frank A. Parrish, Evan A. Howell, George A. Antonelis, Sara J. Iverson, Charles L. Littnan, James D. Parrish, Jeffrey J. Polovina
Estimating The Carrying Capacity Of French Frigate Shoals For The Endangered Hawaiian Monk Seal Using Ecopath With Ecosim, Frank A. Parrish, Evan A. Howell, George A. Antonelis, Sara J. Iverson, Charles L. Littnan, James D. Parrish, Jeffrey J. Polovina
United States Department of Commerce: Staff Publications
The carrying capacity of the French Frigate Shoals (FFS) region for the endangered Hawaiian monk seal was appraised using an updated version of the original FFS Ecopath model (Polovina 1984). Model parameters were updated using recent literature, and data from surveys of the seal population and its bottom-associated prey. Together they produced a static mass balance model for 1998 when the prey surveys began. The Ecopath-estimated monk seal biomass was 0.0045 t/km2, which was in close agreement with the biomass calculated from monk seal field beach counts (0.0046 t/km2). Model simulations through time were done in …
Lake Michigan Lower Food Web: Long-Term Observations And Dreissena Impact, G. Fahnenstiel, T. Nalepa, S. Pothoven, H. Carrick, D. Scavia
Lake Michigan Lower Food Web: Long-Term Observations And Dreissena Impact, G. Fahnenstiel, T. Nalepa, S. Pothoven, H. Carrick, D. Scavia
United States Department of Commerce: Staff Publications
Lake Michigan has a long history of non-indigenous introductions that have caused significant ecological change. Here we present a summary of eight papers that document recent changes and the current state of the lower food web of southern Lake Michigan after the establishment of large dreissenid populations. Results are based on long-term data sets collected by federal and academic research and monitoring programs that place recent changes into a historic context. Dramatic and significant changes in the lower food web, such as the loss of the spring diatom bloom, large declines in phytoplankton productivity, and a decline of Mysis populations, …