Artículo
Diving for food: A switch of foraging strategy of dusky dolphins in Argentina
Fecha de publicación:
09/2012
Editorial:
Springer Tokyo
Revista:
Journal of Ethology
ISSN:
0289-0771
e-ISSN:
1439-5444
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
During winter, dusky dolphins (Lagenorhynchus obscurus) were observed in coordinated diving apparently in a feeding activity, contrasting with the surface feeding observed during summer. The aim of this work consisted in analyzing the diving activity as an alternative foraging strategy in Argentine dusky dolphins, based on sequential analysis. The study area was Golfo Nuevo, located in Northern Patagonia, Argentina. Random transects were surveyed by a research boat from 2001 to 2007. During behavioral sampling, group members were observed continuously and the predominant activity was recorded at 2-min intervals. Six predominant activities were identified. Each 2-min interval was classified according to the activity at the previous interval (preceding activity), the activity at the interval (following activity), and the season (cold or warm). Z scores were calculated and then used to construct sequence diagrams. An association between diving and milling behavior was observed. This could be another foraging tactics different to the surface foraging sequences and this could be related with the distribution or abundance of preys.
Palabras clave:
Behavioral Sequences
,
Diving
,
Dusky Dolphins
,
Foraging Strategy
,
Patagonia
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Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Citación
Degrati, Mariana; Dans, Silvana Laura; Garaffo, Griselda Valeria; Crespo, Enrique Alberto; Diving for food: A switch of foraging strategy of dusky dolphins in Argentina; Springer Tokyo; Journal of Ethology; 30; 3; 9-2012; 361-367
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