Thinking of fish population discrimination: population average phenotype vs. population phenotypes
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AuthorsVasconcelos, J.(Joana); Jurado-Ruzafa, A. (Alba); Otero-Ferrer, J.L. (José Luis); Lombarte, A. (Antoni); Riera, R. (Rodrigo); Tuset, V.M. (Víctor Manuel)
Keywordsotolith contour analysis
medium pelagic fish
North and Central East Atlantic
The genetic polymorphism and phenotypic variation are key in ecology and evolution. The morphological variability of the contour of fish otoliths has been extensively used for the delimitation of stocks. These studies are conventionally based on average phenotype using elliptic Fourier analysis and lineal discriminant analysis as classifier. Considering new analytical options, such as the wavelet transformand non-parametric algorithms, we here analyzed the otolith shape of Trachurus picturatus (blue jack mackerel) from mainland Portugal, Madeira, and the Canaries. We explore the phenotypic variation throughout a latitudinal gradient, establish a hypothesis to explain this variability based on the reaction norms, and determine how the use of average phenotype and/or morphotypes influences in the delimitation of stocks. Four morphotypes were identified in all regions, with an increase of phenotypes in warmer waters. The findings demonstrated that stocks were clearly separated ...
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