INVESTIGADORES
DANS silvana Laura
artículos
Título:
Diving for food: a switch of foraging strategy of dusky dolphins in Argentina
Autor/es:
DEGRATI, MARIANA; DANS, SILVANA LAURA; GARAFFO, GRISELDA VALERIA; CRESPO, ENRIQUE ALBERTO
Revista:
JOURNAL OF ETHOLOGY
Editorial:
SPRINGER TOKYO
Referencias:
Lugar: Tokyo; Año: 2012 vol. 30 p. 361 - 367
ISSN:
0289-0771
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.