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Biol Bull 154: 348-359. (April 1978)
© 1978 Marine Biological Laboratory
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OCCURRENCE AND GROUP ORGANIZATION OF ATLANTIC BOTTLENOSE PORPOISES (TURSIOPS TRUNCATUS) IN AN ARGENTINE BAY

BERND WÜRSIG 1

1 Program for Neurobiology and Behavior, State University of New York, Stony Brook, New York 11794

1. During a 21-month study, individuals of Tursiops truncatus in Golfo San José, Argentina, exhibited a four month occurrence cycle, but showed no seasonal migration.

2. Subgroups numbering 8 to 22 animals included a small core unit of individuals which were consistently found together. Other animals appeared and disappeared in these subgroups on different days in a highly fluid manner which paralleled the open society of African chimpanzees, Pan troglodytes.

3. Some adults showed weak and changing surfacing associations with other adults. Calves consistently surfaced together with a particular adult, except during apparent play or investigative behavior, when calves left adults for brief periods. The mean dive time per animal was 21.8 seconds.

4. Six of seven calves were born in late summer. This calving peak coincided with the highest water temperatures of the year.






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Copyright © 1978 by the Marine Biological Laboratory.