Saved in:
| Main Author: | |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad de Costa Rica
2007
|
| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=44955216 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- Distribución y condiciones ambientales asociadas al comportamiento del delfín bufeo (Tursiops truncatus) y el delfín manchado (Stenella attenuata) (Cetacea: Delphinidae) en el Golfo Dulce, Costa Rica Priscilla Cubero-Pardo Biología behavior cetaceans Costa Rica Tursiops truncatus Stenella attenuata Distribution and environmental conditions related to the behavior in the bottlenose dolphin(Tursiops truncatus) and the spotted dolphin (Stenella attenuata) (Cetacea: Delphinidae) in Golfo Dulce,Costa Rica. Habitat characteristics influencing behavior in animal species vary locally. The influence that a particularenvironmental characteristic can have on a species depends not only on other variables, but on morphological,physiological and social conditions of that species. in this study, developed from June 1996 to July 1997,i studied whether specific behaviors are related to particular distribution areas and environmental factors in thebottlenose (Tursiops truncatus) and the spotted dolphin (Stenella attenuata). The study area was covered alongoblicuous linear transects, and the behavior of single groups was observed from 15 min to 5 h. Environmentalfactors such as depth, temperature, salinity and distance from shore, among others, were considered. For thebottlenose dolphin, foraging/feeding activities showed exclusive coincidence with river mouths, coral reef andmangrove areas, while social and milling activities where seen close to feeding areas. Traveling occurred alongdifferent points parallel to the coast, with a low percentage of cases across the gulf (16.56 %), suggesting thatthe bottlenose rarely crosses from one side to the other. in the spotted dolphin, several behaviors were observedsimultaneously in the schools and it was not possible to associate areas with particular behaviors. The lack ofsignificant relationships among activities and particular environmental variables (ANOvA tests) is attributedto three aspects: (a) transitions among activities generally occurred into a low variable area, (b) dolphins oftentraveled along large areas without changing activities and (c) environmental conditions in Golfo Dulce arehomogeneous. in the two species the highest average in the number of individuals per group corresponded tothe category of active socializing, followed by traveling, passive socializing and feeding. in the case of thebottlenose dolphin, the smallest group size was associated with feeding activities (ANOvA, F= 2.624, p=0.037,n= 156, df= 4), while in the spotted dolphin the smallest group size corresponded to milling activities (ANOvA,F= 3.817, p=0.009, n=51, df= 4). Rev. Biol. Trop. 55 (2): 549-557. Epub 2007 June, 29. 2007 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955216 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.55