Strong top-down control in Southern California kelp forest ecosystems

Benjamin S. Halpern, Karl Cottenie, Bernardo R. Broitman

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

92 Citas (Scopus)

Resumen

Global-scale changes in anthropogenic nutrient input into marine ecosystems via terrestrial runoff, coupled with widespread predator removal via fishing, have created greater urgency for understanding the relative role of top-down versus bottom-up control of food web dynamics. Yet recent large-scale studies of community regulation in marine ecosystems have shown dramatically different results that leave this issue largely unresolved. We combined a multiyear, large-scale data set of species abundances for 46 species in kelp forests from the California Channel Islands with satellite-derived primary production and found that top-down control explains 7- to 10-fold more of the variance in abundance of bottom and mid-trophic levels than does bottom-up control. This top-down control was propagated via a variety of species-level direct and indirect responses to predator abundance. Management of top-down influences such as fishing may be more important in coastal marine ecosystems, particularly in kelp forest systems, than is commonly thought.

Idioma originalInglés
Páginas (desde-hasta)1230-1232
Número de páginas3
PublicaciónScience
Volumen312
N.º5777
DOI
EstadoPublicada - 26 may. 2006

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