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Testing spatial heterogeneity with stock assessment models ArchiMer
Jardim, Ernesto; Eero, Margit; Silva, Alexandra; Ulrich, Clara; Pawlowski, Lionel; Holmes, Steven J.; Ibaibarriaga, Leire; De Oliveir, Jose A. A. A.; Riveiro, Isabel; Alzorriz, Nekane; Citores, Leire; Scott, Finlay; Uriarte, Andres; Carrera, Pablo; Duhamel, Erwan; Mosqueira, Iago.
This paper describes a methodology that combines meta-population theory and stock assessment models to gain insights about spatial heterogeneity of the meta-population in an operational time frame. The methodology was tested with stochastic simulations for different degrees of connectivity between sub-populations and applied to two case studies, North Sea cod (Gadus morua) and Northeast Atlantic sardine (Sardina pilchardus). Considering that the biological components of a population can be partitioned into discrete spatial units, we extended this idea into a property of additivity of sub-population abundances. If the additivity results hold true for putative sub-populations, then assessment results based on sub-populations will provide information to...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00422/53385/54236.pdf
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Adult-mediated connectivity and spatial population structure of sardine in the Bay of Biscay and Iberian coast ArchiMer
Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire; Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe; Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres.
This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000 to 2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and...
Tipo: Text Palavras-chave: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00465/57661/59856.pdf
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