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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

LESCRAUWAET, ANNE-CATHERINE; GIBBONS, JORGE; GUZMAN, LEONARDO  and  SCHIAVINI, ADRIAN. Abundance estimation of Commerson’s dolphin in the eastern area of the Strait of Magallan-Chile. Rev. chil. hist. nat. [online]. 2000, vol.73, n.3, pp.473-478. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2000000300010.

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.

Keywords : Commerson’s dolphin; Cephalorhynchus commersonii; Strait of Magellan; Line transect sampling; habitat preference.

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