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Mouse lemur (Microcebus) species div...

Heckman, Kellie L.

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Mouse lemur (Microcebus) species diversity: A multilocus perspective.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mouse lemur (Microcebus) species diversity: A multilocus perspective./
作者:	Heckman, Kellie L.
面頁冊數:	137 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3001.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biology, Zoology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3177728
ISBN:	9780542173172

Mouse lemur (Microcebus) species diversity: A multilocus perspective.
Heckman, Kellie L.

Mouse lemur (Microcebus) species diversity: A multilocus perspective. - 137 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3001.

Thesis (Ph.D.)--Northwestern University, 2005.

The taxonomy of the genus Microcebus has been revised multiple times in the last decade. Current estimates report a total of eight species that are found primarily in western Madagascar. Previously, phylogenetic relationships were derived using mitochondrial evidence, confirming species under the criteria set by the Phylogenetic Species Concept as monophyletic clades. However, as gene trees are estimates of the species tree, studies should include multiple genetic markers. Also, mitochondrial loci reach reciprocal monophyly four times faster than nuclear markers; the pattern of monophyly limits further examination of the historical demographical processes that lead to speciation events as ancestral polymorphisms are absent. In this dissertation, these limitations were confronted and relationships are evaluated using multiple nuclear markers using a combination of phylogenetic, coalescent and population genetic methods. First, the phylogenetic relationships were estimated using nuclear markers individually and combined. There were multiple patterns found in the nuclear trees that were incongruent with the previously published mitochondrial tree. These include the unresolved relationship of M. ravelobensis , a discordant position of M. tavaratra, and polyphyletic relationship of M. myoxinus, M. rufus, and M. berthae. The second study examined the divergence of sister species M. murinus and M. griseorufus. As M. murinus is widespread along the entire western coast of Madagascar and M. griseorufus is found in relatively small localized region, I tested the hypothesis that griseorufus was derived from murinus by peripatric speciation. It was determined that these species do not show a pattern of diversity that is consistent with peripatric speciation, but that murinus is becoming increasingly structured, possibly as a consequence of habitat fragmentation. The last study further examines the taxonomic status of M. myoxinus, M. rufus, and M. berthae, as they do not form monophyletic groups when using nuclear evidence. I concluded that these three groups are species given that M. myoxinus has genetic diversity that is discordant with the other two species, indicating that these three taxa have been evolving under a separate set of parameters for an extended period of time. In total, studies of speciation are greatly improved when below species diversity is considered.

ISBN: 9780542173172Subjects--Topical Terms:

1018632
Biology, Zoology.

Mouse lemur (Microcebus) species diversity: A multilocus perspective.
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