Browsing Brage IMR by Author "Petitgas, Pierre"
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Assessing natural mortality of anchovy from surveys' population and biomass estimates
Uriarte, A.; Ibaibarriaga, Leire; Abaunza, Pablo; Pawlosky, L.; Massé, Jacques; Petitgas, Pierre; Santos, M. B.; Skagen, Dankert W. (ICES CM documents;2010/C:12, Working paper, 2010)In ordinary catch at age models, natural mortality conditions and determines the catchabilities at age obtained for the surveys which tune the assessments. For the same reason, inferring the Natural mortality of a fish ... -
Relationships between population spatial occupation and population dynamics
Woillez, Mathieu; Petitgas, Pierre; Rivoirard, Jacques; Fernandes, Paul G.; ter Hoftstede, Remment; Korsbrekke, Knut; Orlowski, Andrzej; Spedicato, Maria-Teresa; Politou, Chrissi-Yianna (ICES CM documents;2006/O:05, Working paper, 2006)Population dynamics is commonly described non-spatially using parameters of population demography and vital traits. Population spatial organisation is therefore considered implicit and its importance in the population ... -
Understanding what controls the spatial distribution of fish populations using a multi-model approach
Planque, Benjamin; Loots, Christophe; Petitgas, Pierre; Lindstrøm, Ulf; Vaz, Sandrine (Journal article; Peer reviewed, 2010-12-09)Understanding and predicting the distribution of organisms in heterogeneous environments lies at the heart of ecology. The spatial distribution of fish populations observed in the wild results from the complex interactions ... -
What controls the spatial distribution of spawning anchovy in the Bay of Biscay? : a multi-model approach
Loots, Christophe; Planque, Benjamin; Vaz, Sandrine; Huret, Martin; Petitgas, Pierre; Koubbi, Philippe (ICES CM documents;2010/G:05, Working paper, 2010)Spawning is an important phase for short-lived species like anchovy (Engraulis encrasicolus) as it ensures the renewal of the population through the recruitment process. Data from the PELGAS (PELagiques GAScogne) surveys, ...