Negotiation of parental care when the stakes are high: experimental handicapping of one partner during incubation leads to short-term generosity
Article first published online: 10 SEP 2009
© 2009 The Author. Journal compilation © 2009 British Ecological Society
Journal of Animal Ecology
Volume 79, Issue 1, pages 63–70, January 2010
How to Cite
Wiebe, K. L. (2010), Negotiation of parental care when the stakes are high: experimental handicapping of one partner during incubation leads to short-term generosity. Journal of Animal Ecology, 79: 63–70. doi: 10.1111/j.1365-2656.2009.01614.x
- Issue published online: 11 DEC 2009
- Article first published online: 10 SEP 2009
- Received 2 March 2009; accepted 17 August 2009 Handling Editor: Jonathan Wright
- biparental care;
- game theory;
- sexual conflict;
1. Most game theoretical models of biparental care predict that a reduction in care by one partner should not be fully compensated by increased work of its mate but this may not be true for incubating birds because a reduction in care could cause the entire brood to fail.
2. I performed the first handicapping experiment of both males and females during incubation, by placing small lead weights on the tails of male and female northern flickers Colaptes auratus, a woodpecker in which males do most of the incubation.
3. Females responded to the acute stressor (handling and handicapping) by tending to abandon more readily than males and staying away from the nest longer in the first incubation bout. Among pairs that persisted, both males and females compensated fully for a handicapped partner, keeping the eggs covered nearly 100% of the time.
4. Partners did not retaliate by forcing their handicapped mate to sit on the eggs with a long incubation bout length subsequent to having a long bout length themselves. Instead, during the 24 h immediately after handicapping, males behaved generously by relieving handicapped females early.
5. Such generosity was probably not energetically sustainable as these male partners took on less incubation in the 72 h following handicapping compared to female partners of handicapped males. Males and females are probably generous in the short-term because of the high cost of nest failure during incubation but maintaining increased work loads in the longer term is probably limited by body condition and abandonment thresholds consistent with game theory models.