Data/hora: 16/06/2024 16:33:06

Provedor de dados: 	5	
País: 	France	
Título: 	Recruitment variability and environment: issues related to stock assessments of Atlantic tunas	
Autores: 	Fromentin, Jean-marc; Restrepo, Victor.	
Data: 	2001	
Ano: 	2001	
Resumo: 	Variations in recruitment and year-class strength of fish populations is a well known feature which can be related to three main factors: 1) human activity, mainly through overexploitation of the spawning stock, but also through pollution of the spawning and nursery areas; 2) biological processes, such as predation, cannibalism and competition and 3) environmental events. Life history traits of Atlantic tuna make the probability of a stable recruitment much higher for tropical tuna than temperate ones, but the latter are more adapted to the risks of recruitment failures than the former. As noise in the recruitment can lead to pseudo-cyclic variations in SSB and yields, trends in stock size and catches are also more likely in temperate Atlantic tuna. All these stochastic processes, however, make difficult (and in some cases impossible) the choice of a pertinent deterministic stock -recruit relationship, such as the Ricker or Beverton and Holt models. A way forward is to move to a stock-recruitment relationship that would integrate environmental influence; a step which should be tempered by careful think ing about the physical, biological, physiological and behavioral processes affecting Atlantic tuna.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00194/30562/28983.pdf	
Editor: 	ICCAT	
Relação: 	http://archimer.ifremer.fr/doc/00194/30562/	
Formato: 	application/pdf	
Fonte: 	Collective Volume of Scientific Papers (1021-5212) (ICCAT), 2001 , Vol. 52 , N. 5 , P. 1780-1792	
Fonte: 	ICCAT