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Geographically and environmentally driven spawning distributions of tuna species in the western Mediterranean Sea Öffentlichkeit Deposited

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https://ir.library.oregonstate.edu/concern/articles/05741x460

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Abstract
  • The spawning habitats of many large marine pelagic predators are poorly known. This lack of knowledge hampers conservation efforts that are aimed at identifying critical habitats for the spawning of these species. We hypothesized that phylogenetically related species show different adaptations and respond differently to environmental and geographical cues for when and where to spawn. We tested this hypothesis on a 5 yr data set (2001 to 2005) from the Balearic Islands region (Mediterranean Sea), targeting the early larval stage of 3 abundant species of tuna: bluefin tuna Thunnus thynnus, a large migratory oceanic species; albacore T. alalunga, a smaller species; and bullet tuna Auxis rochei, often found closer to coastal areas. The spatial distribution of spawning locations at the regional scale differed for the 3 tuna species. Bluefin tuna relied heavily on environmental signals, and therefore their spawning habitats can vary depending on the environment. In contrast, the spawning habitat of albacore and bullet tuna was driven mostly by geography and was less variable over contrasting environmental conditions. These regional adaptations for spawning habitats among the 3 tuna species may play a critical role in offspring survival and species interactions, and should be taken into account when establishing conservation practices.
  • Keywords: Spawning strategy, Spatial distribution, Large predators, Regional scale, Tuna, Spawning habitat, Mediterranean, Migratory strategy
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  • Reglero P, Ciannelli L, Alvarez-Berastegui D, Balbín R, López-Jurado JL, Alemany F (2012) Geographically and environmentally driven spawning distributions of tuna species in the western Mediterranean Sea. Marine Ecology Progress Series 463:273-284
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  • 463
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  • This study was funded by the Spanish Institute of Oceanography, the Spanish Ministry of Science (BA -LEARES, 2009-07944 MAR), and the ICTS-SOCIB (Bluefinproject). A research stay of L.C. was supported by a UIB scholarship and ICTS-SOCIB. L.C. acknowledges further support from NSF-CMG grant 0934961.
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