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80’s population-specific compositions of two related anadromous shad species during the oceanic phase determined by microchemistry of archived otoliths ArchiMer
Nachón, David José; Bareille, Gilles; Drouineau, Hilaire; Tabouret, Helene; Taverny, Catherine; Boisneau, Catherine; Berail, Sylvain; Pécheyran, Christophe; Claverie, Fanny; Daverat, Françoise.
The specific stock composition and dispersion of anadromous fish species aggregations in the marine environment are poorly known, while they can play a major role in the metapopulation dynamics. Otolith microchemistry has proven to be a powerful tool to address natal origins of anadromous fish. We used archived otolith microchemistry to investigate the population-specific composition of European shads (Alosa alosa and Alosa fallax) subadults in the ocean during the 80’s. The allocation of natal origin was addressed relying on contemporary water and juveniles signatures within a Bayesian model. A great discrimination of natal origin was obtained at the Biscay Gulf scale. However, the discrimination of 80’s natal origin for the southern rivers with similar...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00504/61562/65487.pdf
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Unsupervised Bayesian reconstruction of individual life histories from otolith signatures: case study of Sr : Ca transects of European eel (Anguilla anguilla) otoliths ArchiMer
Fablet, Ronan; Daverat, Françoise; De Pontual, Helene.
The reconstruction of individual life histories from chemical otolith measures is stated as an unsupervised signal-processing issue embedded in a Bayesian framework. This computational methodology was applied to a set of 192 European eel (Anguilla anguilla) otoliths. It provided a robust and unsupervised analysis of the individual chronologies of habitat use (either river, estuary, or coastal) from Sr:Ca measures acquired along an otolith growth axis. Links between Sr:Ca values and habitat, age, and season and the likelihood of the transitions from one habitat type to another were modelled. Major movement characteristics such as age at transition between habitats and time spent in each habitat were estimated. As a straightforward output, an unsupervised...
Tipo: Text Palavras-chave: Otolith microchemistry; Hidden Markov models; Gaussian mixture models; Bayesian labeling; Fish otoliths; Individual life histories.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2533.pdf
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