Signatures of seaway closures and founder dispersal in the phylogeny of a circumglobally distributed seahorse lineage

Teske, P.R. and Hamilton, H. and Matthee, C.A. and Barker, N.P. (2007) Signatures of seaway closures and founder dispersal in the phylogeny of a circumglobally distributed seahorse lineage. BMC Evolutionary Biology, 7 . p. 138. ISSN 1471-2148

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The importance of vicariance events on the establishment of phylogeographic patterns in the marine environment is well documented, and generally accepted as an important cause of cladogenesis. Founder dispersal (i.e. long-distance dispersal followed by founder effect speciation) is also frequently invoked as a cause of genetic divergence among lineages, but its role has long been challenged by vicariance biogeographers. Founder dispersal is likely to be common in species that colonize remote habitats by means of rafting (e.g. seahorses), as long-distance dispersal events are likely to be rare and subsequent additional recruitment from the source habitat is unlikely. In the present study, the relative importance of vicariance and founder dispersal as causes of cladogenesis in a circumglobally distributed seahorse lineage was investigated using molecular dating. A phylogeny was reconstructed using sequence data from mitochondrial and nuclear markers, and the well-documented closure of the Central American seaway was used as a primary calibration point to test whether other bifurcations in the phylogeny could also have been the result of vicariance events. The feasibility of three other vicariance events was explored: a) the closure of the Indonesian Seaway, resulting in sister lineages associated with the Indian Ocean and West Pacific, respectively; b) the closure of the Tethyan Seaway, resulting in sister lineages associated with the Indo-Pacific and Atlantic Ocean, respectively, and c) continental break-up during the Mesozoic followed by spreading of the Atlantic Ocean, resulting in pairs of lineages with amphi-Atlantic distribution patterns.

Item Type:Article
Uncontrolled Keywords:calibration; cladogenesis; fish; genetic distance; Indian Ocean; nonhuman; nucleotide sequence; phylogeny; sea; seahorse; teleost; unindexed sequence; vicariance; amino acid sequence; animal; founder effect; genetic marker; genetics; molecular evolution; sequence alignment; Smegmamorpha; species differentiation; statistical model; Hippocampinae; Teleostei; cytochrome b; ribosomal protein S7; ribosome protein; RNA 16S; Base Sequence; Cytochromes b; Genetic Markers; Genetic Speciation; Likelihood Functions; Ribosomal Proteins; Cytochrome-B gene; molecular phylogeny; invasion resistance; Mitochondrial-DNA; fishes Teleostei; Indo-Pacific; reef fishes; biological invasions; ecosytem functions; Indonesian seaway; Atlantic Ocean; Indian Ocean
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
Q Science > Q Science (General)
G Geography. Anthropology. Recreation > GC Oceanography
Divisions:Faculty > Faculty of Science > Botany
ID Code:1664
Deposited On:07 May 2010 08:32
Last Modified:06 Jan 2012 16:21
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