Natal dispersal in great bustards: the effect of sex, local population size and spatial isolation

The Journal of Animal Ecology
Carlos A MartínBeatriz Martín

Abstract

1. We investigated the causes of natal dispersal in four Spanish areas where 35 breeding groups of the polygynous great bustard Otis tarda were monitored intensively. A total of 392 juveniles were radio-tracked between 1991 and 2006 by ground and via aeroplane to avoid potential biases derived from the non-detection of long-distance dispersers. 2. We explored 10 explanatory variables that were related to individual phenotypic features, habitat and conspecific traits in terms of group size and breeding performance, and spatial distribution of available breeding groups. Probability of group change and natal dispersal distances were investigated separately through multifactorial analyses. 3. Natal dispersal occurred in 47.8% of the birds and median natal dispersal distance of dispersers was 18.1 km (range 4.97-178.42 km). Sex largely determined the dispersal probability, with 75.6% of males being dispersers and 80.0% of females being philopatric, in contrast to the general pattern of female-biased dispersal found in most avian species. 4. Both the frequency of natal dispersal and dispersal distances were affected by the spatial distribution of breeding groups. More isolated groups showed a higher proportion of philopatric individu...Continue Reading

References

Jan 19, 2002·Proceedings. Biological Sciences·Carlos A MartínDietmar Lieckfeldt
Dec 24, 2002·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Thomas J Valone, Jennifer J Templeton
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Citations

Dec 2, 2008·The Journal of Animal Ecology·Britta A DawideitKatrin Böhning-Gaese
Jan 28, 2010·The Journal of Animal Ecology·María del Mar DelgadoVilis O Nams
Mar 7, 2018·Ecology·Elise R MortonMadan K Oli
Jun 20, 2018·The Journal of Heredity·Aimee Elizabeth KesslerChristopher Irwin Smith

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