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Evolution on islands: Dispersal, sp...

Howarth, Dianella Gwen.

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Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago./
作者:	Howarth, Dianella Gwen.
面頁冊數:	123 p.
附註:	Advisers: David A. Baum; Stephen R. Palumbi.
Contained By:	Dissertation Abstracts International63-04B.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3051188
ISBN:	0493657207

Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago.
Howarth, Dianella Gwen.

Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago. - 123 p.

Advisers: David A. Baum; Stephen R. Palumbi.

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

Examining the patterns of dispersal of plants to islands and their subsequent speciation helps to understand the diversity of island life. <italic>Scaevola </italic> (Goodeniaceae), which has dispersed throughout the Pacific Basin, radiating on many high island groups, provides an ideal system for studying these patterns. Data from the Internal Transcribed Spacer (ITS) shows that <italic> Scaevola</italic> (excluding <italic>Scaevola collaris</italic> and including <italic> Diaspasis filifolia</italic>) represents a monophyletic genus. The genus is Australian in origin with at least six separate dispersal events from Australia. Four of these dispersals resulted in single extra-Australian species. The remaining two were larger radiations that were each related to one of the widely dispersed strand species, <italic>S. taccada</italic> and <italic> S. plumieri</italic>. Remarkably, three of the six dispersals established species on the remote Hawaiian Archipelago. One of these dispersal events to the Hawaiian Islands, which resulted in eight endemic species, was examined further.

ISBN: 0493657207Subjects--Topical Terms:

1017825
Biology, Botany.

Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago.
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100 1 $a Howarth, Dianella Gwen. $3 1251315
245 1 0 $a Evolution on islands: Dispersal, speciation, and hybridization in Scaevola (Goodeniaceae) in the Hawaiian Archipelago.
300 $a 123 p.
500 $a Advisers: David A. Baum; Stephen R. Palumbi.
500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 1641.
502 $a Thesis (Ph.D.)--Harvard University, 2002.
520 $a Examining the patterns of dispersal of plants to islands and their subsequent speciation helps to understand the diversity of island life. <italic>Scaevola </italic> (Goodeniaceae), which has dispersed throughout the Pacific Basin, radiating on many high island groups, provides an ideal system for studying these patterns. Data from the Internal Transcribed Spacer (ITS) shows that <italic> Scaevola</italic> (excluding <italic>Scaevola collaris</italic> and including <italic> Diaspasis filifolia</italic>) represents a monophyletic genus. The genus is Australian in origin with at least six separate dispersal events from Australia. Four of these dispersals resulted in single extra-Australian species. The remaining two were larger radiations that were each related to one of the widely dispersed strand species, <italic>S. taccada</italic> and <italic> S. plumieri</italic>. Remarkably, three of the six dispersals established species on the remote Hawaiian Archipelago. One of these dispersal events to the Hawaiian Islands, which resulted in eight endemic species, was examined further.
520 $a Unfortunately, the phylogenetic history of closely related plant species has been difficult to infer because of a lack of well-characterized genes that show sufficient sequence variation. Large nuclear intron regions were therefore sought out, and primers were designed for introns in Nitrate Reductase (NIA) and LEAFY (LFY). These regions were compared to Glyceraldehyde 3-Phosphate Dehydrogenase (G3PDH) and ITS, to produce gene genealogies for the seven extant Hawaiian endemic diploid species. Multiple accessions from these four regions were sequenced from each of these <italic>Scaevola</italic> species. The sequences from all four loci were congruent across five of the seven species (excluding <italic> S. kilaueae</italic> and <italic>S. procera</italic>). When all four regions were combined the relationships among these five species were fully resolved even though they were only partially resolved by the individual gene regions. The alleles from <italic>S. procera</italic> and <italic>S. kilaueae</italic> were incongruent among loci. It was hypothesized that <italic>S. procera</italic> is the result of an ancestral homoploid hybridization event between <italic> S. gaudichaudii</italic> and <italic>S. mollis</italic> and that <italic> S. kilaueae</italic> may be the result of hybridization between <italic>S. coriacea</italic> and <italic>S. chamissoniana</italic> on the island of Hawaii. Additionally, a hybrid zone between <italic>S. gaudichaudiana</italic> and <italic> S. mollis</italic> appears to be more recent and may be compounded by the introduction of a generalist bee, <italic>Apis mellifera</italic>.
590 $a School code: 0084.
650 4 $a Biology, Botany. $3 1017825
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