Veinticinco años (1986-2011) de monitorización de varamientos de mamíferos marinos en el litoral de Doñana (Huelva, SO España)

Gutiérrez‐Expósito, Carlos; Rivilla, Juan Carlos; Alís, Sonia; Máñez, Manuel; Barrios-Garrido, Héctor; Jiménez, Francisco Justo; Cobo, María Dolores

doi:10.7325/galemys.2012.n09

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Information about the current presence of fin whales in the Gulf of Cadiz is scarce. Between 1986 and 2011, only 7 fin whales out of 303 (2%) stranded cetaceans were recorded on a 60 km Spanish beach of the Gulf of Cadiz at about 6.5°W longitude (Gutiérrez-Expósito et al 2012). Further west, 30 nautical miles offshore south Portugal (around 7.5 to 8°W), a spring survey found 0.5 encounters of the species per 100 km in waters from about 200 to 750 m depth, mainly in April (Vilela et al 2016).…”

Section: Author Copymentioning

confidence: 99%

Contemporary migration of fin whales through the Strait of Gibraltar

Gauffier¹,

Verborgh²,

Giménez³

et al. 2018

Mar. Ecol. Prog. Ser.

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Fin whales Balaenoptera physalus used to be abundant in the Strait of Gibraltar and nearby Atlantic areas until their rapid collapse due to intense whaling at the beginning of the 20 th century. Recent studies seem to indicate that some fin whales, believed to belong to the North East North Atlantic (NENA) stock, now use the area to travel between the Atlantic Ocean and the Mediterranean Sea. In this study, we analyzed 15 yr of direct observations combining vessel and land-based surveys with photo-identification to characterize the migration of fin whales through the Strait. These combined observations provide a temporal and spatial analysis of the whales' movement patterns and behavioral activity. Our main findings suggest a migration of a small community of fin whales through the Strait of Gibraltar, with remarkable seasonal directionality. All whales travelled towards the Atlantic Ocean between May and October, and 69% towards the Mediterranean Sea between November and April. Observations of young whales exiting the Mediterranean Sea mainly between May and July suggest that at least part of this community is likely to calve in the basin. Due to the special sensitivity of the species to ship strikes and underwater noise, and the intense maritime traffic in the Strait of Gibraltar, we urge Spain and Morocco to cooperate through the International Maritime Organization (IMO) to ensure a safe crossing of these whales by the effective implementation and year-round extension of the existing recommendation of a seasonal vessel speed reduction to 13 knots.

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Section: Author Copymentioning

confidence: 99%

Contemporary migration of fin whales through the Strait of Gibraltar

Gauffier¹,

Verborgh²,

Giménez³

et al. 2018

Mar. Ecol. Prog. Ser.

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“…The current estimate of the total population for the eastern North Atlantic is about 35,000 individuals, a figure considered to represent about 70% of the original population size (Buckland et al 1992a, b;North Atlantic Marine Mammal Commission 2005;IWC 2009). Nevertheless, recovery appears to have been spatially heterogeneous and the current distribution differs from that occurring at the beginning of the whaling operations: areas where the fin whale was originally very abundant, like the Gibraltar strait (Tønnessen andJohnssen 1982, Aguilar 2013) or the Faroe Islands (North Atlantic Marine Mammal Commission 2000), are now apparently devoid of this species (North Atlantic Marine Mammal Commission 2004, Clapham et al 2008, Guti errez-Exp osito et al 2012, while in other areas where whales were caught in comparable numbers, abundance has recovered rapidly Jover 1989, Buckland et al 1992b). Such heterogeneous demographic trajectories suggest a complex structure in subpopulations.…”

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confidence: 99%

Stable isotope analysis and fin whale subpopulation structure in the eastern North Atlantic

Vighi

Borrell

Aguilar

2015

Marine Mammal Science

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The North Atlantic fin whale was subject to heavy exploitation in the past and, despite partial recovery, it is still considered endangered. Recent research has questioned its currently accepted subpopulation structure and migratory movements, challenging management and conservation efforts. Here we contribute to this discussion by presenting results of stable isotope analysis of fin whale bones and krill samples collected from fin whale stomachs from two exploited areas, west Iceland and northwest Spain, and comparing these results with North Atlantic isoscapes. In krill, d15 N values were highly variable and no significant differences in d C values in bone were higher than in krill, due to trophic enrichment, and were not significantly different between areas. Both krill and bone results were slightly inconsistent with the local isoscapes, maybe due to seasonal variations in local productivity and in krill diet and, in the case of bone, to its capability to integrate long-term isotopic values, derived from food consumed in distant areas. Conversely, d18 O values, which reflect the basal signal of sea water, were consistent with isoscapes and significantly higher in whales from northwestern Spain, possibly indicating migration to breeding grounds located at lower latitudes.

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“…The fin whale population of the Gulf of Cádiz was subject to a severe process of exploitation early in the twentieth century that decimated and very likely extirpated the local population. [10][11][12] Consistent with this, all sighting surveys and stranding records [13] in the last decades show that the species is currently very scarce in the region. The argument of Castellote et al (2014) [3] that repeated recording of fin whales in the area indicates high abundance of fin whales is weak.…”

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confidence: 56%