Regime Shift in an Exploited Fish Community Related to Natural Climate Oscillations

Regime Shift in an Exploited Fish Community Related to Natural Climate Oscillations

Identifying the various drivers of marine ecosystem regime shifts and disentangling their respective influence are critical tasks for understanding biodiversity dynamics and properly managing exploited living resources such as marine fish communities. Unfortunately, the mechanisms and forcing factors underlying regime shifts in marine fish communities are still largely unknown although climate ...

Stabilization of an Exploited Fish Population

Abstract. The purpose of the paper is to design a fishing strategy in order to regulate an exploited fish population. To this end, we use a stagestructured model of a harvested fish population that has been derived in [5]. We give a formula for the fishing effort as a feedback control that allows to stabilize the system. travail réalisé avec la contribution financière du CNCPRST (Maroc) et du C...

Evolutionary regime shifts in age and size at maturation of exploited fish stocks.

Worldwide declines of fish stocks raise concerns about deleterious consequences of harvesting for stock abundances and individual life histories, and call for appropriate recovery strategies. Fishes in exploited stocks mature earlier at either larger or smaller sizes due to both genetic and plastic responses. The latter occur commonly when reduced competition for food leads to faster growth. Us...

The influence of climate regime shift on ENSO

Observations indicated that for the El Niño/Southern Oscillation (ENSO) there have been eastward displacements of the zonal wind stress anomalies and surface heat flux (short wave heat flux and latent heat flux) anomalies during El Niño episodes in the 1981-1995 regime relative to the earlier regime of 1961-1975 (without corresponding displacements during La Niña episodes). Our numerical experi...

Are exploited fish populations stable?