Literaturdatenbank
Literaturdatenbank |
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Bowen, B. W., Bass, A. L., Soares, L., & Toonen, R. J. (2005). Conservation implications of complex population structure: lessons from the loggerhead turtle (caretta caretta). Molecular Ecology, 14(8), 2389–2402.
Added by: Sarina Wunderlich (23 Dec 2008 13:29:50 UTC) Last edited by: Beate Pfau (01 Jan 2009 10:39:16 UTC) |
| Resource type: Journal Article DOI: 10.1111/j.1365-294X.2005.02598.x BibTeX citation key: Bowen2005c View all bibliographic details  |
Categories: General Keywords: Caretta, Caretta caretta, Cheloniidae, Genetik = genetics, Schildkröten = turtles + tortoises Creators: Bass, Bowen, Soares, Toonen Collection: Molecular Ecology |
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| Abstract |
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Complex population structure can result from either sex-biased gene flow or population overlap during migrations. Loggerhead turtles (Caretta caretta) have both traits, providing an instructive case history for wildlife management. Based on surveys of maternally inherited mtDNA, pelagic post-hatchlings show no population structure across the northern Atlantic (φST < 0.001, P = 0.919), subadults in coastal habitat show low structure among locations (φST = 0.01, P < 0.005), and nesting colonies along the southeastern coast of the United States have strong structure (φST = 0.42, P < 0.001). Thus the level of population structure increases through progressive life history stages. In contrast, a survey of biparentally inherited microsatellite DNA shows no significant population structure: RST < 0.001; FST = 0.002 (P > 0.05) across the same nesting colonies. These results indicate that loggerhead females home faithfully to their natal nesting colony, but males provide an avenue of gene flow between regional nesting colonies, probably via opportunistic mating in migratory corridors. As a result, all breeding populations in the southeastern United States have similar levels of microsatellite diversity (HE = 0.70–0.89), whereas mtDNA haplotype diversity varies dramatically (h = 0.00–0.66). Under a conventional interpretation of the nuclear DNA data, the entire southeastern United States would be regarded as a single management unit, yet the mtDNA data indicate multiple isolated populations. This complex population structure mandates a different management strategy at each life stage. Perturbations to pelagic juveniles will have a diffuse impact on Atlantic nesting colonies, mortality of subadults will have a more focused impact on nearby breeding populations, and disturbances to adults will have pinpoint impact on corresponding breeding populations. These findings demonstrate that surveys of multiple life stages are desirable to resolve management units in migratory marine species. KEYWORDS dispersal • homing behaviour • marine turtles • microsatellite DNA • migratory behaviour • mitochondrial DNA Added by: Sarina Wunderlich Last edited by: Beate Pfau |
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WIF
Added by: Sarina Wunderlich Last edited by: Beate Pfau |