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OAS accession Detail for 0243116
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| accessions_id: | 0243116 | archive |
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| Title: | NOAA RESTORE Science Program: ecosystem modeling to improve fisheries management in the Gulf of Mexico: model inputs and outputs for the US Gulf-wide model, 1980-01-01 to 2016-12-31 (NCEI Accession 0243116) |
| Abstract: | This dataset is a collection of files containing the necessary inputs to, and relevant outputs from, the U.S. Gulf-wide ecosystem model, developed using the Ecopath with Ecosim (EwE) modeling software package. The spatial extent of the model is 25°-30.5° N and -81° to -97.3° W and hindcast simulations were run in Ecosim from 1980 (the Ecopath snapshot year) to 2016 at a monthly timestep. Input parameters for Ecopath include biomass, consumption, mortality, diet, landings, and discards for 78 functional groups included in the model. Each input or output parameter type is included as its own csv file with informative names. |
| Date received: | 20211102 |
| Start date: | 19800101 |
| End date: | 20161231 |
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| West boundary: | -97.3 |
| East boundary: | -80.9 |
| North boundary: | 30.5 |
| South boundary: | 24.9 |
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| Submitting institution: | US DOC; NOAA; NOS; National Centers for Coastal Ocean Science |
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| Supplementary information: | Submission Package ID: 0LWCP8 Methods: To model the US Gulf-wide ecosystem (out to about 400 meters), we used the EwE software (Christensen and Walters 2004). The EwE software suite is composed of three main components: Ecopath, Ecosim and Ecospace. Ecopath is the “mass-balanced” static version that provides a snapshot of the system. Ecosim is the time dynamic simulation module that allows for predicting ecosystem and species changes over time. And lastly, Ecospace is the spatial component that predicts the distribution of biomass and catches of each functional group over a two-dimensional spatial grid at a monthly time step. The software is freely available at www.ecopath.org along with complete documentation of the model. The first version of the US Gulf-wide EwE model was developed at the Southeast Fisheries Science Center to evaluate the ecosystem dynamics within the Gulf of Mexico, with particular emphasis on indirect effects of fishing (e.g., bycatch) and a comprehensive evaluation of predator-prey dynamics (Sagarese et al. 2016; 2017). The diet matrix input into the US Gulf-wide Ecopath model was based on a meta-analysis conducted on nearly 600 references (Sagarese et al. 2016). While previous Gulf of Mexico ecosystem models were available for different spatial zones of the Gulf of Mexico (e.g., Geers et al. 2016; Chagaris et al. 2015), this model was built with a focus on socioeconomically important federally and internationally managed species on a Gulf-wide scale, matching the spatial extent of U.S. management. In the current version, we updated the Gulf-wide Ecopath model from Sagarese et al. (2017) by parameterizing the model to reflect 1980 conditions, splitting functional groups, refining fishing fleets, and incorporating more age structure for species such as Gulf menhaden and red snapper (Berenshtein et al. 2021). Once the Gulf-wide Ecopath model achieved mass balance, we compiled and fit the Ecosim predictions to time-series of biomass and catches obtained primarily from SEDAR stock assessments or monitoring surveys. The current version of the US Gulf-wide EwE model includes 16 fishing fleets and 78 functional groups, and was calibrated to reference time series on abundance, catch, fishing mortality, and fishing effort from 1980 to 2016. The primary objective of the current US Gulf-wide EwE model is to evaluate top-down (fishing and predation) processes in the Gulf of Mexico with a focus on Gulf menhaden. We used the US Gulf-wide Ecosim model calibrated for the years 1980-2016 to produce time- and age- explicit natural mortality estimates for five age classes of Gulf menhaden (Brevoortia patronus). These results were implemented in a sensitivity run during the most recent Gulf menhaden stock assessment update, which showed model outcomes and stock status similar to the base-run. Future analyses will include evaluating tradeoffs between menhaden harvest and predator biomass. |
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| Metadata version: | 3 |
| Keydate: | 2021-11-10 16:00:24+00 |
| Editdate: | 2021-11-29 19:16:21+00 |