Abundance estimation of Commersons dolphin in the eastern area of the Strait of Magallan-Chile
Abundance of Commersons 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 s...
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| Autores principales: | , , , |
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| Lenguaje: | English |
| Publicado: |
Sociedad de Biología de Chile
2000
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| Materias: | |
| Acceso en línea: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000300010 |
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| Sumario: | Abundance of Commersons 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). Commersons dolphin showed a habitat preference for the narrows, compared to open waters in the study area. |
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