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Journal of Heredity Advance Access published online on December 7, 2006
Journal of Heredity, doi:10.1093/jhered/esl045
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Fine-Scale Genetic Structure and Fire-Created Habitat Patchiness in the Australian Allodapine Bee, Exoneura nigrescens (Hymenoptera: Apidae)

Adam Stow, Letitia Silberbauer, Andrew J. Beattie, and David A. Briscoe

From the School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

Address correspondence to Dr. A. Stow at the address above, or e-mail: astow{at}bio.mq.edu.au.

Fire promotes an abundance of nest sites for the stem nesting bee Exoneura nigrescens, which remain viable for approximately 10 years. The finite duration of nesting substrate and localized fire events suggest that migration should minimize genetic structure among suitable habitat patches. Exoneura nigrescens was sampled from 7 localities with a known fire history in southwestern Victoria, Australia. Individual bees were genotyped at 8 microsatellite loci and genic and genotypic analyses applied to examine genetic structure among burn patch localities, within burn patches, and within colonies. Despite relatively short-term availability of nesting substrates, remarkably fine-scale genetic structure was observed both among burn patches and within burn patches. The spatial distribution of relatedness shows a strong pattern of isolation-by-distance at geographic distances to 35 km, suggesting that genetic partitioning among burn patches is, at least in part, a result of dispersal ability. Genetic structure within burn patches includes colonies consisting of close kin with genic partitioning among nests. Relatedness structure within colonies suggests that polygamy, multiple breeding pairs, and a lack of inbreeding typifies the mating system.


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