Interannual environmental variability influences the annual and spatial overlap of tuna species during the larval stage
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AuthorsReglero, P. (Patricia); Ciannelli, L. (Lorenzo); Balbín, R. (Rosa); Álvarez-Berastegui, D. (Diego); Alemany, F. (Francisco)
The distribution of recently-hatched larvae suggests spatially segregated spawning habitats of three tuna species at the local scale in the Balearic Sea (NW Mediterranean). Whereas bluefin tuna shows environmental preferences for spawning, bullet tuna and albacore are driven mainly by geography, therefore less variable over time. As they develop, larval tuna can quickly become piscivorous. Previous analysis have indicated that predation rates during the larval stages has the potential to impact recruitment dynamics. In spite of the different attributes of their habitats, the three species of larval tuna can spatially overlap around the Balearic region. Thus it is important to understand the mechanisms that lead to increased spatial overlap among the three species and between young and older stages of the same species, in order to understand the mechanisms of recruitment dynamics. We develop an annual and spatial overlap metric and analyze how environmental heterogeneity influence tuna ...
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