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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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Evidence for male dispersal along the coasts but no migration in pelagic waters in dusky dolphins (Lagenorhynchus obscurus) Cassens, I.; Van Waerebeek, K.; Best, P.B.; Tzika, A.; Van Helden, A.L.; Crespo, E.A.; Milinkovitch, M.C. (2005). Evidence for male dispersal along the coasts but no migration in pelagic waters in dusky dolphins (Lagenorhynchus obscurus). Mol. Ecol. 14(1): 107-121. http://dx.doi.org/10.1111/j.1365-294X.2004.02407.x In: Molecular Ecology. Blackwell: Oxford. ISSN 0962-1083; e-ISSN 1365-294X, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 114323 [ download pdf ]

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Trefwoorden

Acids > Organic compounds > Organic acids > Nucleic acids > DNA Aquatic organisms > Marine organisms > Aquatic mammals > Marine mammals Argentina Behaviour > Migrations Biogeny > Phylogeny Bioselection > Genetic drift Environments > Aquatic environment > Pelagic environment New Zealand Peru Population characteristics > Population structure > Sex ratio South Africa Cetacea [WoRMS]; Lagenorhynchus obscurus (Gray, 1828) [WoRMS] ISE, Peruvian Exclusive Economic Zone [Marine Regions]; PSE, New Zealand [Marine Regions]; PSW, Argentina [Marine Regions]; PSW, South African Exclusive Economic Zone [Marine Regions] Marien/Kust

Author keywords

Cetacea; mtDNA; microsatellites; phylogeography; male-biased gene flow;bottleneck; ancient polymorphism

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Auteurs		Top
Cassens, I. Van Waerebeek, K., meer Best, P.B. Tzika, A.	Van Helden, A.L. Crespo, E.A. Milinkovitch, M.C., meer

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Abstract

Using nine nuclear species-specific microsatellite loci and two mitochondrial gene fragments cytochrome b and control region), we investigated the processes that have shaped the geographical distribution of genetic diversity exhibited by contemporary dusky dolphin (Lagenorhynchus obscurus) populations. A total of 221 individuals from four locations (Peru, Argentina, southern Africa, and New Zealand) were assayed, covering most of the species’ distribution range. Although our analyses identify a general demographic decline in the Peruvian dusky dolphin stock (recently affected by high natural and humaninduced mortality levels), comparison between the different molecular markers hint at an ancient bottleneck that predates recent El Niño oscillations and human exploitation. Moreover, we find evidence of a difference in dispersal behaviour of dusky dolphins along the South American coast and across the Atlantic. While data in Peruvian and Argentine waters are best explained by male-specific gene flow between these two populations, our analyses suggest that dusky dolphins from Argentina and southern Africa recently separated from an ancestral Atlantic population and, since then, diverged without considerable gene flow. The inclusion of a few New Zealand samples further confirms the low levels of genetic differentiation among most dusky dolphin populations. Only the Peruvian dusky dolphin stock is highly differentiated, especially at mitochondrial loci, suggesting that major fluctuations in its population size have led to an increased rate of genetic drift.

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