Cory’s shearwater by-catch in the Mediterranean Spanish commercial longline fishery: implications for management

Báez, José C.; García-Barcelona, Salvador; Mendoza, Manuel; Urbina, José M. Ortiz de; Real, Raimundo; Macías, David

doi:10.1007/s10531-014-0625-6

Cited by 21 publications

(24 citation statements)

References 49 publications

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“…Nevertheless, this result agrees with previous studies carried out in the western Mediterranean, which found an increase in the probability of birds attending longliners and/or greater incidental catches during non-working days of the trawlers (García- Barcelona et al 2010, Laneri et al 2010, Báez et al 2014, Soriano-Redondo et al 2016. Trawler discards have a great influence on foraging behaviour of scavenging species (Bartumeus et al 2010, Cama et al 2013, Bécares et al 2015, so the absence of trawler activity can induce birds to search for alternative food resources, such as bait used by longline vessels.…”

Section: Discussionsupporting

confidence: 92%

“…In Scopoli's shearwater, it includes both the prelaying and incubation periods. These results coincide with those by Laneri et al (2010), but differ from other studies carried out in the western Mediterranean, which found greater catches of Scopoli's shearwaters during the chick-rearing and fledging periods (October; Belda & Sánchez 2001, García-Barcelona et al 2010, Báez et al 2014). These differences might be related to small to medium-scale geographical differences between these groups of studies, matching different spatiotemporal distribution patterns of the shearwaters, and highlight the relevance of applying a local approach to management.…”

Section: Discussionsupporting

confidence: 68%

“…In general, previous studies found an increase in the incidental mortality with the number of hooks deployed per set (Delord et al 2010, Báez et al 2014), but its influence may differ among species (Dietrich et al 2009). Nonetheless, other studies did not assess its effect, as they considered the number of hooks set as a simple measure of the fishing effort (Belda & Sánchez 2001, Trebilco et al 2010.…”

Section: Discussionmentioning

confidence: 88%

“…To assess its influence on seabird attraction to longliners, trawling activity was also considered, as previous studies found an important effect on seabird catches (Laneri et al 2010, Báez et al 2014, SorianoRedondo et al 2016. Consecutive settings with the same fishing gear characteristics were grouped to avoid pseudoreplication.…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Seabirds and demersal longliners in the northwestern Mediterranean: factors driving their interactions and bycatch rates

Cortés¹,

Arcos²,

González‐Solís³

2017

Mar. Ecol. Prog. Ser.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Seabirds and demersal longliners in the northwestern Mediterranean: factors driving their interactions and bycatch rates

Cortés¹,

Arcos²,

González‐Solís³

2017

Mar. Ecol. Prog. Ser.

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“…The Scopoli's Shearwater is endemic to the Mediterranean where it occurs over the entire Basin, and its population in this region was tentatively estimated in earlier studies at 57,000-76,000 breeding pairs (Zotier et al 1999;Sultana and Borg 2006). The Scopoli's Shearwater is threatened to a large extent by fishery bycatch (Belda and Sánchez 2001;Cooper et al 2003;Dimech et al 2009;Igual et al 2009;García-Barcelona et al 2010;Laneri et al 2010;Karris et al 2013;Báez et al 2014), introduced predators (Igual et al 2009;Ruffino et al 2009;Capizzi et al 2010), urban light-induced mortality (Baccetti et al 2005;Raine et al 2007) and adult-, chick-and egg-harvesting (Zotier et al 1992;Massa 2006;Sultana and Borg 2006;N. Baccetti personal communication).…”

Section: Introductionmentioning

confidence: 99%

Reassessment of the size of the Scopoli’s Shearwater population at its main breeding site resulted in a tenfold increase: implications for the species conservation

Rau

Bourgeois²,

Thévenet³

et al. 2015

J Ornithol

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Scopoli's Shearwater (Calonectris diomedea) is a Procellariiform endemic to the Mediterranean Basin which is considered to be vulnerable in Europe due to recent local declines and its susceptibility to both marine and terrestrial threats. In the 1970s-1980s, its population size was estimated at 57,000-76,000 breeding pairs throughout the Mediterranean Basin, with the largest colony, estimated at 15,000-25,000 pairs, found on Zembra Island, Tunisia.The objectives of our study were to re-estimate the size of the breeding population on Zembra Island, to reassess the global population size of the species, and to analyse the implications of these findings on status and conservation of this species in the Mediterranean. Using distance sampling, we estimated the Zembra breeding population to be 141,780 pairs (95 % confidence interval 113,720-176,750 pairs).

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Sex‐specific foraging behavior in response to fishing activities in a threatened seabird

García-Tarrasón

Bécares

Bateman

et al. 2015

Ecology and Evolution

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Some seabird species have learnt to efficiently exploit fishing discards from trawling activities. However, a discard ban has been proposed as necessary in Europe to ensure the sustainability of the seas. It is of crucial importance for the management and conservation purposes to study the potential consequences of a discard ban on the foraging ecology of threatened seabirds. We assessed the influence of fishing activities on the feeding habits of 22 male and 15 female Audouin's gulls (Larus audouinii) from the Ebro Delta (Mediterranean Sea) during the breeding period using GPS loggers together with Stable Isotope Analysis (SIA), which provided new insights into their foraging behavior and trophic ecology, respectively. GPS data revealed different sex-specific foraging patterns between workdays and weekends. Females were highly consistent in that they foraged at sea throughout the week even though discarding stops at weekends. In contrast, males switched from foraging at sea during the week (when discards are produced) to an increased use of rice field habitats at weekends (when fishermen do not work). This sex-specific foraging behavior could be related to specific nutritional requirements associated with previous egg production, an energetically demanding period for females. However, on a broader time scale integrated by the SIA, both sexes showed a high degree of individual specialization in their trophic ecology. The need to obtain detailed information on the dependence and response of seabirds to fishing activities is crucial in conservation sciences. In this regard, sex-specific foraging behavior in relation to fisheries has been overlooked, despite the ecological and conservation implications. For instance, this situation may lead to sex differentiation in bycatch mortality in longlines when trawlers do not operate. Moreover, any new fisheries policy will need to be implemented gradually to facilitate the adaptation of a specialized species to a discard ban scenario.

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Cory’s shearwater by-catch in the Mediterranean Spanish commercial longline fishery: implications for management

Cited by 21 publications

References 49 publications

Seabirds and demersal longliners in the northwestern Mediterranean: factors driving their interactions and bycatch rates

Seabirds and demersal longliners in the northwestern Mediterranean: factors driving their interactions and bycatch rates

Reassessment of the size of the Scopoli’s Shearwater population at its main breeding site resulted in a tenfold increase: implications for the species conservation

Sex‐specific foraging behavior in response to fishing activities in a threatened seabird

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