English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/46225
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Fish biomass in the world ocean: a century of decline

AutorChristensen, Villy; Piroddi, Chiara ; Coll, Marta ; Steenbeek, Jeroen ; Buszowski, Joe; Daniel, Pauly
Fecha de publicación2011
EditorUniversity of British Columbia Press
CitaciónWorking paper Series (2011)
SerieWorking paper
#2011-06
ResumenWill there be fish in the ocean in 2050? To address this question, we made a data‐rich global assessment of how fish biomass has changed over the last hundred years. We built on more than 200 ecosystem models representing marine ecosystems throughout the world covering the period from 1880 to 2007, and all constructed based on the same approach. We used spatial modeling to distribute biomasses based on habitat preferences, ecology, and feeding conditions. We extracted over 68,000 estimates of fish biomass (for predatory and prey fishes, separately) distributed over time and space, and used multiple regression to predict biomass distributions. The regressions were highly significant and predict that the biomass of predatory fish in the world oceans has declined by two‐thirds over the last hundred years. This decline is accelerating, with 54% having taken place in the last 40 years. We also found that the biomass of prey fish has more than doubled over the last hundred years, likely as a consequence of predation release. Jointly, these findings allow us to predict that there will be fish in the ocean in 2050, but they will be mainly of small prey fish. Our study also addresses the controversy whether ‘fishing down the food web’ is a phenomenon actually occurring in nature or a sampling artifact due to catches not representing relative abundances in ecosystems. Our study strongly indicates that the impact of fisheries has caused fishing down the food web of ecosystem resources at the global level.
Descripción20 pages, 6 figures, 4 tables.
Versión del editorhttp://www.fisheries.ubc.ca/publications/working-papers
URIhttp://hdl.handle.net/10261/46225
Aparece en las colecciones: (ICM) Informes y documentos de trabajo
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
3098.pdf1,09 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.