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| Hinke, Jefferson T; Pacific Fisheries Environmental Laboratory and Joint Institute for Marine and At; jhinke@pfeg.noaa.gov; Kaplan, Isaac C; Center for Limnology, University of Wisconsin; ickaplan@wisc.edu; Aydin, Kerim; Alaska Fisheries Science Center; Kerim.Aydin@noaa.gov; Watters, George M; Pacific Fisheries Environmental Laboratory; gwatters@pfeg.noaa.gov; Olson, Robert J; Inter-American Tropical Tuna Commission; rolson@iattc.org; Kitchell, James F. K.; Center for Limnology, University of Wisconsin; kitchell@mhub.limnology.wisc.edu. |
| We use food-web models to develop visualizations to compare and evaluate the interactions of tuna fisheries with their supporting food webs in the eastern tropical Pacific (ETP) and the central north Pacific (CNP) Oceans. In the ETP and CNP models, individual fisheries use slightly different food webs that are defined by the assemblage of targeted tuna species. Distinct energy pathways are required to support different tuna species and, consequently, the specific fisheries that target different tuna assemblages. These simulations suggest that catches of tunas, sharks, and billfishes have lowered the biomass of the upper trophic levels in both systems, whereas increases in intermediate and lower trophic level animals have accompanied the decline of top... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Ecosystem modeling; Food webs; Longline fishing; Purse-seine fishing; Tunas; Trophic levels; Pacific Ocean. |
| Ano: 2004 |
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