Measuring dispersal in a metapopulation using stable isotope enrichment: high rates of sex-biased dispersal between patches in a mayfly metapopulation

被引:49
作者
Caudill, CC
机构
[1] Georgia Inst Technol, Sch Biol, Atlanta, GA 30332 USA
[2] Cornell Univ, Dept Entomol, Ithaca, NY 14853 USA
[3] Rocky Mt Biol Labs, Crested Butte, CO 81224 USA
关键词
D O I
10.1034/j.1600-0706.2003.12467.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Dispersal affects a wide array of ecological and evolutionary processes, but has been difficult to estimate empirically. A (15)Nitrogen stable isotope enrichment technique was used to passively mark all developing Callibaetis ferrugineus hageni (Eaton) mayfly larvae in a beaver pond that had previously been shown to be a patch in a source-sink metapopulation. After enrichment during the larval stages, dispersal among ponds by adult females was demonstrated by the presence of unmarked females ovipositing in the labeled pond, and marked females in an unlabeled pond. Observed frequencies of marked females suggested incomplete mixing between ponds. In contrast, males rarely dispersed from their natal pond, which was consistent with the unusual mating system in this species - adult Callibaetis are short-lived, do not feed, and females are sexually receptive immediately after emerging from the larval habitat. The frequent dispersal demonstrated using the stable isotope technique was a critical component of the source-sink dynamic observed in this metapopulation, and further use of this technique will provide insights into patterns of dispersal in spatially structured habitats.
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页码:624 / 630
页数:7
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