KOPS - The Institutional Repository of the University of Konstanz

Deep genetic divergences among Indo-Pacific populations of the coral reef sponge Leucetta chagosensis (Leucettidae) : founder effects, vicariance, or both?

Deep genetic divergences among Indo-Pacific populations of the coral reef sponge Leucetta chagosensis (Leucettidae) : founder effects, vicariance, or both?

Cite This

Files in this item

Checksum: MD5:41162a753414453ae662b30296620c5b

WÖRHEIDE, Gert, Laura S. EPP, Luciana MACIS, 2008. Deep genetic divergences among Indo-Pacific populations of the coral reef sponge Leucetta chagosensis (Leucettidae) : founder effects, vicariance, or both?. In: BMC Evolutionary Biology. 8, 24. eISSN 1471-2148. Available under: doi: 10.1186/1471-2148-8-24

@article{Worheide2008-01-26genet-45270, title={Deep genetic divergences among Indo-Pacific populations of the coral reef sponge Leucetta chagosensis (Leucettidae) : founder effects, vicariance, or both?}, year={2008}, doi={10.1186/1471-2148-8-24}, volume={8}, journal={BMC Evolutionary Biology}, author={Wörheide, Gert and Epp, Laura S. and Macis, Luciana}, note={Article Number: 24} }

2019-03-01T09:58:29Z Wörheide, Gert Epp, Laura S. Macis, Luciana eng 2008-01-26 terms-of-use Background<br />An increasing number of studies demonstrate that genetic differentiation and speciation in the sea occur over much smaller spatial scales than previously appreciated given the wide distribution range of many morphologically defined coral reef invertebrate species and the presumed dispersal-enhancing qualities of ocean currents. However, knowledge about the processes that lead to population divergence and speciation is often lacking despite being essential for the understanding, conservation, and management of marine biodiversity. Sponges, a highly diverse, ecologically and economically important reef-invertebrate taxon, exhibit spatial trends in the Indo-West Pacific that are not universally reflected in other marine phyla. So far, however, processes generating those unexpected patterns are not understood.<br /><br />Results<br />We unraveled the phylogeographic structure of the widespread Indo-Pacific coral reef sponge Leucetta chagosensis across its known geographic range using two nuclear markers: the rDNA internal transcribed spacers (ITS 1&2) and a fragment of the 28S gene, as well as the second intron of the ATP synthetase beta subunit-gene (ATPSb-iII). This enabled the detection of several deeply divergent clades congruent over both loci, one containing specimens from the Indian Ocean (Red Sea and Maldives), another one from the Philippines, and two other large and substructured NW Pacific and SW Pacific clades with an area of overlap in the Great Barrier Reef/Coral Sea. Reciprocally monophyletic populations were observed from the Philippines, Red Sea, Maldives, Japan, Samoa, and Polynesia, demonstrating longstanding isolation. Populations along the South Equatorial Current in the south-western Pacific showed isolation-by-distance effects. Overall, the results pointed towards stepping-stone dispersal with some putative long-distance exchange, consistent with expectations from low dispersal capabilities.<br /><br />Conclusion<br />We argue that both founder and vicariance events during the late Pliocene and Pleistocene were responsible to varying degrees for generating the deep phylogeographic structure. This structure was perpetuated largely as a result of the life history of L. chagosensis, resulting in high levels of regional isolation. Reciprocally monophyletic populations constitute putative sibling (cryptic) species, while population para- and polyphyly may indicate incipient speciation processes. The genetic diversity and biodiversity of tropical Indo-Pacific sponges appears to be substantially underestimated since the high level of genetic divergence is not necessarily manifested at the morphological level. Wörheide, Gert Deep genetic divergences among Indo-Pacific populations of the coral reef sponge Leucetta chagosensis (Leucettidae) : founder effects, vicariance, or both? 2019-03-01T09:58:29Z Macis, Luciana Epp, Laura S.

Downloads since Mar 1, 2019 (Information about access statistics)

Woerheide_2-kifmcl76dnmw0.pdf 38

This item appears in the following Collection(s)

Search KOPS


Browse

My Account