A continuous model of biomass size spectra governed by predation and the effects of fishing on them

Type Article
Date 2004
Language English
Author(s) Benoit Eric2, Rochet Marie-Joelle1
Affiliation(s) 1 : IFREMER, Lab MAERHA, F-44311 Nantes 03, France.
2 : Univ Rochelle, Math Lab, F-17042 La Rochelle, France.
Source Journal of Theoretical Biology (0022-5193) (Elsevier), 2004 , Vol. 226 , N. 1 , P. 9-21
DOI 10.1016/S0022-5193(03)00290-X
WOS© Times Cited 115
Keyword(s) Predation, Mortality, Growth, Biomass size spectrum, Allometry
Abstract A new time-dependent continuous model of biomass size spectra is developed. In this model, predation is the single process governing the energy flow in the ecosystem, as it causes both growth and mortality. The ratio of predator to prey is assumed to be distributed: predators may feed on a range of prey sizes. Under these assumptions, it is shown that linear size spectra are stationary solutions of the model. Exploited fish communities are simulated by adding fishing mortality to the model: it is found that realistic fishing should affect the curvature and stability of the size spectrum rather than its slope.
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