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title Cockle population dynamics: recruitment predicts adult biomass, not the inverse
authors Magalhaes, L; Freitas, R; de Montaudouin, X
author full name Magalhaes, L.; Freitas, R.; de Montaudouin, X.
title Cockle population dynamics: recruitment predicts adult biomass, not the inverse
nationality internacional
language English
document type Article
abstract Bivalves are an essential component of marine ecosystems, playing an important role in community maintenance. The abundance of an exploited bivalve population depends on the balance between inputs (reproduction/recruitment and growth) and outputs (mortality and fishery removals). Reproduction and subsequent successful recruitment are crucial for population sustainability. In the present study, the reciprocal relationship between recruitment (operationally defined as retention on a 1-mm sieve) and adult stock size was studied using a 17-year database (1997-2014) on an unexploited Cerastoderma edule population in a national nature reserve in Arcachon Bay, France. Results showed that cockle recruitment in a temperate climate with mild winters is rather unrelated to temperature in the previous months, but depends on recruitment timing. When temperature reached 14 degrees C in May, stimulating early recruitment, recruit density was high (500-1000 ind m(-2)), and the resulting cohort had a relatively long lifespan (>1 year) with high associated secondary production. Conversely, when temperature reached 14 degrees C in June, recruitment occurred later (June), recruit density was lower (0-500 ind m(-2)), and the cohort had a shorter lifespan (<4 months) with a consequent low secondary production. Adult spawner biomass was not positively correlated with recruitment, and the spawner biomass at the time of recruitment did not negatively affect recruitment. More than previous studies, the present study showed that factors driving cockle recruitment success are highly site-dependent, temperatures at the site being only one component.
author address [Magalhaes, L.; Freitas, R.] Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal; [Magalhaes, L.; Freitas, R.] Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal; [Magalhaes, L.; de Montaudouin, X.] Univ Bordeaux, EPOC, UMR CNRS 5805, 2 Rue Pr Jolyet, F-33120 Arcachon, France
reprint address Magalhaes, L (reprint author), Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal.; Magalhaes, L (reprint author), Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal.; Magalhaes, L (reprint author), Univ Bordeaux, EPOC, UMR CNRS 5805, 2 Rue Pr Jolyet, F-33120 Arcachon, France.
e-mail address luisa.magalhaes@ua.pt
funding agency and grant number Portuguese Foundation for Science and Technology (FCT-Fundacao para a Ciencia e Tecnologia) [PD/BD/52570/2014, SFRH/BPD/92258/2013]
funding text Many thanks to the staff of the Natural Reserve of Banc d'Arguin (SEPANSO) and to the INSU for logistic help (sailors and Planula 4 ship). Authors are grateful to the students who contributed to this long-term survey, among them I. Kisielewski, C. Desclaux, H. Blanchet, N. Lavesque, A. Palvadeau, M. C. Sajus, H. Raigne, G. Lassalle, I. Paul-Pont, C. Dang, M. Gam, S. Dubois, L. Lanceleur, T. Do, C. Binias, H. Guyard. The authors are indebted to anonymous reviewers for pertinent suggestions and improvement of the manuscript and also to Anthony Moreira for correcting the English. The first author benefited from a PhD grant (ref.: PD/BD/52570/2014) and the second author a postdoc grant (ref.: SFRH/BPD/92258/2013), both awarded by the Portuguese Foundation for Science and Technology (FCT-Fundacao para a Ciencia e Tecnologia).
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cited reference count 46
publisher city HEIDELBERG
issn 0025-3162
29-character source abbreviation MAR BIOL
iso source abbreviation Mar. Biol.
publication date JAN
year published 2016
volume 163
issue 1
article number 16
digital object identifier (doi) 10.1007/s00227-015-2809-3
page count 10
web of science category Marine & Freshwater Biology
subject category Marine & Freshwater Biology
document delivery number DC5EH
unique article identifier WOS:000369243700019
link http://dx.doi.org/10.1007/s00227-015-2809-3