Reproductive isolation between Pogonomyrmex rugosus and two lineages with genetic caste determination.

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Version: author
Serval ID
serval:BIB_B2E8FCF53DDB
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Reproductive isolation between Pogonomyrmex rugosus and two lineages with genetic caste determination.
Journal
Ecology
Author(s)
Cahan S.H., Julian G.E., Schwander T., Keller L.
ISSN
0012-9658
Publication state
Published
Issued date
2006
Peer-reviewed
Oui
Volume
87
Number
9
Pages
2160-2170
Language
english
Abstract
Hybrid speciation occurs when combination of two interspecific genomes results in individuals that are of high fitness but reproductively incompatible with the parental species. Although hybrid speciation is a relatively common source of new species in plants, it appears to be a much rarer occurrence in animal taxa. Here we report on reproductive isolation and range overlap between the rough harvester ant Pogonomyrmex rugosus and two lineages with hybrid genotypes (H 1 and H2). Both lineages obligately interbreed and produce genetically distinct queen and worker offspring, a phenomenon referred to as genetic caste determination (GCD). Diploid offspring produced by gametes of the same lineage develop only into queens, whereas diploid offspring derived from gametes of distinct lineages develop into workers. We investigated small-scale patterns of gene flow between the parent and the two H lineages by sampling along an 80-km transect between a pure P. rugosus population and a two-lineage population. Microsatellite and mitochondrial markers both indicated virtually no gene flow between the parent species and either lineage even at sites where parental and H-lineage colonies co-occurred. The geographic ranges of the parental species and the two-lineage population were essentially parapatric, with a surprisingly narrow band of overlap and evidence of spatial structuring even at microgeographic scales within the transition zone. This suggests that ecological competition with the parent species plays a significant role in determining the evolutionary persistence and current distribution of the hybrid lineages and the genetic caste system.
Keywords
Animals, Ants/genetics, Ants/physiology, Electron Transport Complex IV/genetics, Female, Gene Flow/genetics, Gene Frequency, Genetic Speciation, Genetics, Population, Genotype, Geography, Male, Microsatellite Repeats/genetics, Population Dynamics
Pubmed
Web of science
Create date
24/01/2008 18:39
Last modification date
20/08/2019 15:21
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