Static versus dynamic model for forecasting salmon pre-fishery abundance of the River Bush: a Bayesian comparison

Prévost, Étienne; Crozier, W. W.; Schön, Pieter-Jan

doi:10.1016/j.fishres.2005.01.002

Cited by 1 publication

(1 citation statement)

References 27 publications

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“…Being anadromous and phylopatric, the migration of juveniles seaward, and later up‐river returns of adults, offers a unique opportunity for observing and assessing each generation both before and after fishery‐induced mortality (Potter et al . ; Prévost, Crozier & Schön ).…”

Section: Introductionmentioning

confidence: 99%

Modelling the interactive effects of selective fishing and environmental change on Atlantic salmon demogenetics

Piou

Taylor

Papaïx

et al. 2015

Journal of Applied Ecology

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1. Changes in life-history traits have been observed in many fish species over past decades. This led to the 'fisheries-induced evolution' hypothesis proposing that fisheries may be causing genetic changes to populations through selective harvesting. Another hypothesis, which is not mutually exclusive, is that observed changes are due to phenotypic plasticity in response to environmental changes. 2. Using an individual-based demogenetic model, we investigate the relative importance of selective fishing and environmental change scenarios on the Atlantic salmon Salmo salar. 3. In simulation experiments, results show that poor oceanic growth conditions resulting from environmental change drove mainly phenotypic responses, such as a shift towards a multiple-sea-winter life history accompanied by a decline in population size. These changes were attributable to the longer time needed to reach maturation and the resulting increase in cumulative mortality during the oceanic phase. 4. Increased selective fishing against multiple-sea-winter fish mainly induced an evolutionary effect in the form of a lower maturation threshold in females, increasing the proportion of one sea-winter fish. The maturation threshold of males was not modified by selective fishing due to their earlier reproduction and return after a single winter at sea, thereby avoiding most of the selective effects of fishing. 5. Policy implications. The results suggest that given the present configuration of traditional fisheries, fishing is likely to worsen the effects of oceanic environmental change. Management strategies avoiding targeting multiple-sea-winter fish may need to be considered in order to ensure the populations' resilience to poor oceanic conditions for growth. (Résumé d'auteur

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Section: Introductionmentioning

confidence: 99%