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Reproductive isolation and the evolu...

Zigler, Kirk Steven.

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Reproductive isolation and the evolution of bindin in sea urchins.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Reproductive isolation and the evolution of bindin in sea urchins./
作者:	Zigler, Kirk Steven.
面頁冊數:	129 p.
附註:	Advisers: Clifford W. Cunningham; David R. McClay.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Biology, Genetics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063213
ISBN:	049381969X

Reproductive isolation and the evolution of bindin in sea urchins.
Zigler, Kirk Steven.

Reproductive isolation and the evolution of bindin in sea urchins. - 129 p.

Advisers: Clifford W. Cunningham; David R. McClay.

Thesis (Ph.D.)--Duke University, 2002.

Explaining how reproductive isolation evolves between marine species is of crucial importance in understanding speciation in the sea. The availability of detailed information on phylogeography, on temporal and gametic isolation, and on alpha taxonomy makes sea urchins (echinoids) good subjects for the study of marine speciation. Sea urchins are broadcast spawners with external fertilization. Reproductive isolation between species could result from distinct spawning times or from species-specific gamete interactions. Congeneric sympatric sea urchins often have overlapping annual or monthly spawning periods. In such cases, reproductive isolation between closely related sea urchins is, at least in part, the product of gametic incompatibility. The sperm protein bindin plays a central role in sperm-egg attachment and fusion in sea urchins. Changes in this locus can thus cause gametic incompatibility and convert populations into different species. Previous studies sequenced bindin in two orders of sea urchins. We report sequences of mature bindin from four new orders, including the distantly related sand dollars, heart urchins and pencil urchins. The six orders in which bindin is now known indicate that bindin was present in the common ancestor of all extant sea urchins more than 250 million years ago.

ISBN: 049381969XSubjects--Topical Terms:

1017730
Biology, Genetics.

Reproductive isolation and the evolution of bindin in sea urchins.
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245 1 0 $a Reproductive isolation and the evolution of bindin in sea urchins.
300 $a 129 p.
500 $a Advisers: Clifford W. Cunningham; David R. McClay.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4082.
502 $a Thesis (Ph.D.)--Duke University, 2002.
520 $a Explaining how reproductive isolation evolves between marine species is of crucial importance in understanding speciation in the sea. The availability of detailed information on phylogeography, on temporal and gametic isolation, and on alpha taxonomy makes sea urchins (echinoids) good subjects for the study of marine speciation. Sea urchins are broadcast spawners with external fertilization. Reproductive isolation between species could result from distinct spawning times or from species-specific gamete interactions. Congeneric sympatric sea urchins often have overlapping annual or monthly spawning periods. In such cases, reproductive isolation between closely related sea urchins is, at least in part, the product of gametic incompatibility. The sperm protein bindin plays a central role in sperm-egg attachment and fusion in sea urchins. Changes in this locus can thus cause gametic incompatibility and convert populations into different species. Previous studies sequenced bindin in two orders of sea urchins. We report sequences of mature bindin from four new orders, including the distantly related sand dollars, heart urchins and pencil urchins. The six orders in which bindin is now known indicate that bindin was present in the common ancestor of all extant sea urchins more than 250 million years ago.
520 $a Patterns of bindin evolution differed among three genera that had been studied previously. In <italic>Echinometra</italic> and <italic>Strongylocentrotus </italic>, both of which contain sympatric species, there is evidence for positive selection on bindin. In <italic>Arbacia</italic>, whose extant species are all allopatric, there is no evidence of positive selection. We extended these studies by examining patterns of bindin evolution in three genera of echinoids, two with predominantly allopatric species (<italic>Tripneustes </italic> and <italic>Lytechinus</italic>), and one with sympatric species (<italic>Heliocidaris</italic>). Bindin of <italic>Tripneustes</italic> and <italic> Lytechinus</italic>, like that of <italic>Arbacia</italic>, shows no evidence of diversifying selection. In <italic>Heliocidaris</italic>, we identified a burst of adaptive evolution along a single lineage. Thus, for six genera of echinoids, mode of bindin evolution is correlated with whether the species in a genus are allopatric or sympatric. These six studies highlight the variable patterns of selection that a single gamete recognition protein can experience in different lineages, and caution against generalizations about the evolution of gamete recognition proteins.
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