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Publication
Thinking of fish population discrimination: population average phenotype vs. population phenotypes
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Advisor(s)
Abstract(s)
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 transform and 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 with classification rates over 90%. The use of morphotypes,
revealed seasonal variations in their frequencies and per region. The presence of shared
phenotypes in different proportions among fishing grounds may open new management
approaches in migratory species. These results show the importance of the phenotypic
diversity in fisheries management.
Description
Keywords
Otolith contour analysis Wavelets Medium pelagic fish Stocks North and Central East Atlantic . Faculdade de Ciências da Vida
Citation
Vasconcelos, J., Jurado-Ruzafa, A., Otero-Ferrer, J. L., Lombarte, A., Riera, R., & Tuset, V. M. (2021). Thinking of fish population discrimination: population average phenotype vs. population phenotypes. Frontiers in Marine Science, 1489. https://doi.org/10.3389/fmars.2021.740296
Publisher
Frontiers Media