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| Format: | Artículo científico |
| Language: | en |
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Pontificia Universidad Católica de Valparaíso
2007
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| Online Access: | https://www.redalyc.org/articulo.oa?id=45635202 |
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Table of Contents:
- Environmental factors governing the distribution of the bottlenose (Tursiops truncatus) and the spotted dolphin (Stenella attenuata) in Golfo Dulce, South Pacific, off Costa Rica Priscilla Cubero-Pardo Ciencias de la Tierra cetaceans Costa Rica spotted dolphin bottlenose dolphin environmental factors This study, conducted from June 1996 to July 1997, was directed at determining the abiotic environmentalfactors governing the distribution of the bottlenose dolphin (Tursiops truncatus) and the pan-tropical spotted dolphin(Stenella attenuata) in Golfo Dulce. The spotted dolphin was associated with significantly deeper zones (t-test = -9.761;p < 0.001, n = 202) and with higher salinity (t-test = -3.538; p = 0.001; n = 202) than the bottlenose dolphin. The combinationof environmental variables in the distribution areas of each species in Golfo Dulce was different, both spatially (F= 9.724, df = 12; p < 0.001) and seasonally (F = 9.735; df = 12; p < 0.001). Of all the environmental variables considered,Multiple Discriminant Analysis showed depth to be the main factor differenciating the distribution areas of the two species.The relationship between group size in each species, depth, and the location of their distribution areas in relation to theshore were analyzed and evidence regarding these aspects and variations in foraging strategies and prey composition wasproposed to explain the differences found in their spatial distributions. Seasonal variations in salinity in the distributionareas and their inverse relationship with the time of the year were analyzed in relation to their possible combined effectson prey composition during different seasons in order to explain the seasonal variations in distribution patterns. 2007 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45635202 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.35