IUCN/SSC Cat Specialist Group Library

IUCN / SSC Cat Specialist Group - Digital Cat Library

View printer friendly
Pettorelli, N.; Durant, S.M.
Family effects on early survival and variance in long-term reproductive success of female cheetahs
2007 Journal of Animal Ecology (76): 908-914
While it is generally accepted that the survival of offspring within families may be correlated, the extent of correlation has been largely untested. Furthermore, the impact of such correlation on the estimated variance in females' reproductive success has rarely been quantified. Here we use an exceptional data set from a long-term study of individually recognized cheetahs from the Serengeti National Park in Tanzania to formally quantify family effects in carnivores. We show (i) that cubs from the same litter exhibit more similar fates than unrelated cubs when it comes to first-year survival; and (ii) that the observed variance of the longterm reproductive success of females is twice the variance expected under the assumption of complete independence of fates between cubs. We suggest that family effects are likely to be widespread in vertebrates with average litter sizes > 1, and could have important consequences for population dynamics and population viability analyses.
	PDF files are only accessible to Friends of the Cat Group. Joining Friends of the Cat Group gives you unlimited access and downloads in the Cat SG Library for one year, and allows you to receive our newsletter Cat News (2 regular issues per year plus special issues). More information how to join here