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Title: Relative abundance and distribution of fisheries influence risk of seabird bycatch
Author: Soriano Redondo, Andrea
Cortés, Verónica
Reyes-González, José Manuel
Guallar, Santi
Bécares, Juan
Rodríguez, Beneharo
Arcos Pros, José Manuel
González-Solís, Jacob
Keywords: Ocells marins
Ecologia marina
Indústria pesquera
Sea birds
Marine ecology
Issue Date: 23-Nov-2016
Publisher: Nature Publishing Group
Abstract: Fisheries provide an abundant and predictable food source for many pelagic seabirds through discards, but also pose a major threat to them through bycatch, threatening their populations worldwide. The reform of the European Common Fisheries Policy (CFP), which intends to ban discards through the landing obligation of all catches, may force seabirds to seek alternative food sources, such as baited hooks from longlines, increasing bycatch rates. To test this hypothesis we performed a combined analysis of seabird-fishery interactions using as a model Scopoli's shearwaters Calonectris diomedea in the Mediterranean. Tracking data showed that the probability of shearwaters attending longliners increased exponentially with a decreasing density of trawlers. On-board observations and mortality events corroborated this result: the probability of birds attending longliners increased 4% per each trawler leaving the longliner proximity and bird mortality increased tenfold when trawlers were not operating. Therefore, the implementation of the landing obligation in EU waters will likely cause a substantial increase in bycatch rates in longliners, at least in the short-term, due to birds switching from trawlers to longliners. Thus the implementation of the landing obligation must be carefully monitored and counterbalanced with an urgent implementation of bycatch mitigation measures in the longline fleet.
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It is part of: Scientific Reports, 2016, vol. 6, p. 37373
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ISSN: 2045-2322
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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