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Ecology and conservation genetics of...

Hardcastle, Edith Lucille.

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Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands./
Author:	Hardcastle, Edith Lucille.
Description:	128 p.
Notes:	Director: Johnnie L. Gentry.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Biology, Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3122377
ISBN:	9780496697274

Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands.
Hardcastle, Edith Lucille.

Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands. - 128 p.

Director: Johnnie L. Gentry.

Thesis (Ph.D.)--University of Arkansas, 2003.

Delphinium newtonianum (Ranunculaceae) is a rare, endemic of the Interior Highlands region. The genetic diversity and genetic structure was determined for this species and ecological variables that directly influence the genetics were assessed. Five populations from the Ozarks and four from the Ouachita region were chosen to study these variables. Population size of D. newtonianum was estimated in 2001 and varies from less than 100 individuals to over 20,000. The large populations of this globally rare species may operate to maintain genetic diversity and the stability of the species. Potential pollinators visiting D. newtonianum were recorded during the peak period of bloom (June). Common visitors of D. newtonianum are ruby-throated hummingbirds (Archilochus colubris) and several species of bumblebee (Bombus sp.). An exclusion experiment determined the importance of pollinators to reproduction of D. newtonianum and the relative extent of outcrossing versus selfing. The low level of seed set in the experimental group (7%) indicates the species is primarily outcrossing. Genetic structure of D. newtonianum was assessed from five populations in the Ozark region and three from the Ouachitas. Genetic diversity in D. newtonianum is high but these results are consistent with other rare Delphinium species. Populations within the Ozark region do not show significant genetic structure due to high level of gene flow between populations. However, Ouachita populations have undergone genetic drift and the loss of genetic diversity relative to Ozark populations. In addition, all Ouachita populations are significantly differentiated from all other populations. A neighbor-joining tree based on genetic distance shows that Ouachita populations are more closely related to each other than any Ozark population. Delphinium newtonianum from the Ouachitas have had the time and space (100 km) necessary to develop significant differences from Ozark populations and have advanced along a separate evolutionary trajectory. Delphinium newtonianum consists of two separate evolutionary significant units (ESUs). If possible, genetic material from each region should not be mixed in order to conserve natural patterns of variation. In addition, management agencies should strive to conserve population in both regions in order to conserve the full range of genetic diversity in the species.

ISBN: 9780496697274Subjects--Topical Terms:

1017825
Biology, Botany.

Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands.
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100 1 $a Hardcastle, Edith Lucille. $3 1285614
245 1 0 $a Ecology and conservation genetics of Delphinium newtonianum (Moore's delphinium) Ranunculaceae, a rare endemic of the Interior Highlands.
300 $a 128 p.
500 $a Director: Johnnie L. Gentry.
500 $a Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0517.
502 $a Thesis (Ph.D.)--University of Arkansas, 2003.
520 $a Delphinium newtonianum (Ranunculaceae) is a rare, endemic of the Interior Highlands region. The genetic diversity and genetic structure was determined for this species and ecological variables that directly influence the genetics were assessed. Five populations from the Ozarks and four from the Ouachita region were chosen to study these variables. Population size of D. newtonianum was estimated in 2001 and varies from less than 100 individuals to over 20,000. The large populations of this globally rare species may operate to maintain genetic diversity and the stability of the species. Potential pollinators visiting D. newtonianum were recorded during the peak period of bloom (June). Common visitors of D. newtonianum are ruby-throated hummingbirds (Archilochus colubris) and several species of bumblebee (Bombus sp.). An exclusion experiment determined the importance of pollinators to reproduction of D. newtonianum and the relative extent of outcrossing versus selfing. The low level of seed set in the experimental group (7%) indicates the species is primarily outcrossing. Genetic structure of D. newtonianum was assessed from five populations in the Ozark region and three from the Ouachitas. Genetic diversity in D. newtonianum is high but these results are consistent with other rare Delphinium species. Populations within the Ozark region do not show significant genetic structure due to high level of gene flow between populations. However, Ouachita populations have undergone genetic drift and the loss of genetic diversity relative to Ozark populations. In addition, all Ouachita populations are significantly differentiated from all other populations. A neighbor-joining tree based on genetic distance shows that Ouachita populations are more closely related to each other than any Ozark population. Delphinium newtonianum from the Ouachitas have had the time and space (100 km) necessary to develop significant differences from Ozark populations and have advanced along a separate evolutionary trajectory. Delphinium newtonianum consists of two separate evolutionary significant units (ESUs). If possible, genetic material from each region should not be mixed in order to conserve natural patterns of variation. In addition, management agencies should strive to conserve population in both regions in order to conserve the full range of genetic diversity in the species.
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710 2 $a University of Arkansas. $3 1017562
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