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Science 24 August 1979:
Vol. 205. no. 4408, pp. 831 - 833
DOI: 10.1126/science.205.4408.831
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Articles

Nest Guard Replacement in the Antarctic Fish Harpagifer bispinis: Possible Altruistic Behavior

ROBERT A. DANIELS 1

1 Department of Wildlife and Fisheries Biology, University of California, Davis 95616

Nesting biology of the Antarctic plunder fish, Harpagifer bispinis (Schneider), was examined at Arthur Harbor, Antarctic Peninsula, during the austral winter, 1975. Females prepare nest sites, spawn, and guard the eggs for 4 to 5 months, the longest guarded incubation period reported for any fish species. If this guard is removed, it is soon replaced by a conspecific, usually male. If the second guard is removed, a third replaces it. Guards are essential to ensure nest survival. Selfish or parental acts or acts of kinship or reciprocity do not adequately explain guard replacement. The act may be altruistic.

Submitted on June 6, 1978
Revised on May 9, 1979


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Science. ISSN 0036-8075 (print), 1095-9203 (online)