Pelagic habitat and offspring survival in the eastern stock of Atlantic bluefin tuna
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AuthorsReglero, P. (Patricia); Balbín, R. (Rosa); Abascal, F.J. (Francisco Javier); Medina, A.; Álvarez-Berastegui, D. (Diego); Rasmuson, L.; Mourre, B.; Saber-Rodríguez, S. (Sámar); Ortega-García, A. (Aurelio); Blanco, E. (Edurne); de-la-Gándara, F. (Fernando); Alemany, F. (Francisco) (13) |; Ingram, W.; Hidalgo, M. (Manuel)
In this manuscript, we test how an understanding of geographical variation in larval fitness in relation to temperature and habitat use could be a useful method to improve our understanding of recruitment and develop better indices of annual recruitment. On the basis of the assumption that growth and survival of tuna larvae are influenced by temperature, we have developed a potential larval survival index for Atlantic bluefin tuna (Thunnus thynnus) by combining empirical data from egg and larval rearing experiments with temperature data from hydrodynamic models. The experiments were designed to test the full range of temperature variability that bluefin larvae would experience in the field and provide a mechanistic understanding of the processes driving egg and larval survival. We then developed a biological model using the temperature-related growth expressions and a size-dependent survival function for the larvae. The biological model was applied to a time-series of spatially explicit ...
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