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Estimación de abundancia de tunina overa en el sector oriental del Estrecho de Magallanes, Chile = Abundance estimation of Commerson’s dolphin in the eastern area of the Strait of Magallan-Chile
Lescrauwaet, A.-K.; Gibbons, J.; Guzman, L.; Schiavini, A. (2000). Estimación de abundancia de tunina overa en el sector oriental del Estrecho de Magallanes, Chile = Abundance estimation of Commerson’s dolphin in the eastern area of the Strait of Magallan-Chile. Rev. Chil. Hist. Nat. 73: 473-478
In: Revista Chilena de Historia Natural. La Universidad de Chile: Santiago. ISSN 0716-078X; e-ISSN 0717-6317, more
Peer reviewed article  
Available in  Authors 
Keywords
    Cephalorhynchus commersonii (Lacépède, 1804) [WoRMS]
    PSW, Chile, Magellan Straits [Marine Regions]
    Marine/Coastal
Authors  Top 
  • Lescrauwaet, A.-K., more
  • Gibbons, J.
  • Guzman, L.
  • Schiavini, A.
Abstract
    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.
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