Experimental evidence that age-specific reproductive success is independent of environmental effects

• Published in: Proceedings of the Royal Society. B, Biological sciences Vol. 266; no. 1427; pp. 1489 - 1493
• Main Authors: Daunt, F., Wanless, S., Harris, M. P., Monaghan, P.
• Format: Journal Article
• Language: English
• Published: The Royal Society 22.07.1999
• Subjects: Age; Age groups; Aviculture; Breeding; Breeding seasons; Chicks; Eggs; Hatching; Incubation; Parental Age; Phalacrocorax aristotelis; Reproductive Success; Shag; Timing Of Breeding
• ISSN: 0962-8452; 1471-2954
• DOI: 10.1098/rspb.1999.0805

An age-specific improvement in reproductive performance has been reported in many iteroparous breeders. However, whether this is a consequence of intrinsic differences in competence amongst age classes or extrinsic differences in the environment they experience is unclear since the timing of breeding within a season generally also differs with age. To disentangle these effects, we experimentally manipulated the timing of breeding in shags, Phalacrocorax aristotelis. Old and young individuals thus reared their chicks at the same time both early and late in the breeding season. When breeding in the same environmental conditions, old pairs performed consistently better than young pairs. These data clearly demonstrate that the age-related differences in reproductive performance are not a result of environmental effects, but rather a consequence of intrinsic differences in brood rearing capacity.