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Abundance estimation of Commerson’s dolphin in the eastern area of the Strait of Magallan-Chile RChHN
LESCRAUWAET,ANNE-CATHERINE; GIBBONS,JORGE; GUZMAN,LEONARDO; SCHIAVINI,ADRIAN.
Abundance of Commerson‘s dolphin, Cephalorhynchus commersonii (Lacépède 1804), in the eastern portion of the Strait of Magellan was estimated by means of aerial transects in autumn (June 1996). Using a helicopter at 100 m altitude and 129 km h-1, 58 sightings representing 98 animals (average group size Es = 1.7, SD = 0.13) along 818.6 km of linear transects were recorded. Data analysis with "Distance" software gave a density estimation of 0.34 ind km-2 (CV = 0.27) and a population size of 1,206 (95% CI 711-2,049 individuals). Commerson’s dolphin showed a habitat preference for the narrows, compared to open waters in the study area.
Tipo: Journal article Palavras-chave: Commerson’s dolphin; Cephalorhynchus commersonii; Strait of Magellan; Line transect sampling; Habitat preference.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300010
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Migratory round-trip of individually identified humpback whales at the Strait of Magellan: clues on transit times and phylopatry to destinations RChHN
CAPELLA,JUAN J; GIBBONS,JORGE; FLÓREZ-GONZÁLEZ,LILIÁN; LLANO,MARTHA; VALLADARES,CARLOS; SABAJ,VALERIA; VILINA,YERKO A.
Humpback whales undertake seasonal migration between productive high-latitude areas where they feed in summer and low-latitude tropical waters where mating and calving occur during winter. In the eastern south Pacific, the species breeds off Colombia and Ecuador, and feeds primarily in the western Antarctic Peninsula and in the waters of the Strait of Magellan (SM), recently described as a new feeding ground for humpback whales. Comparison of fluke photographs of 62 individuals from the SM obtained during the austral summer from 1999 to 2005 and 1,042 individuals from Colombia, provided conclusive matches for six individuals, with an overall interchange Índex of 0.093. Eight migratory trips between summer and winter grounds were registered for four whales...
Tipo: Journal article Palavras-chave: Colombia; Humpback whales; Migration; Photo-identification; Strait of Magellan.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400008
Registros recuperados: 2
Primeira ... 1 ... Última
 

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