*Zoology Department, School of General Studies, Australian National University, Canberra, A.C.T.
POPULATION ASPECTS OF DELAYED BIRTH IN THE QUOKKA (SETONIX BRACHYURUS)
Article first published online: 20 AUG 2009
1963 The Zoological Society of London
Proceedings of the Zoological Society of London
Volume 141, Issue 4, pages 783–789, December 1963
How to Cite
SHIELD, J. W. and WOOLLEY, P. (1963), POPULATION ASPECTS OF DELAYED BIRTH IN THE QUOKKA (SETONIX BRACHYURUS). Proceedings of the Zoological Society of London, 141: 783–789. doi: 10.1111/j.1469-7998.1963.tb01625.x
- Issue published online: 30 OCT 2009
- Article first published online: 20 AUG 2009
- Accepted 9th October, 1962
The ability of the Rottnest Island population of the quokka (Setonix brachyurus) to replace lost pouch young from stored blastocysts has been examined. It was found that, under experimental conditions, young were replaced throughout the breeding season. However, the age distribution of the young in the wild population provided evidence that there was no considerable replacement from stored blastocysts in the field. The maximum replacement under experimental conditions was 60 per cent at the beginning of the breeding season in February. The percentage of animals producing further young declined gradually after this until in August, when seasonal anoestrus commences, no young removed from the pouch were replaced from stored blastocysts. Factors which may affect the ability of the animals to produce young from stored blastocysts, and the decline in success throughout the breeding season are discussed.