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Systematics of North American Astereae.

Szubryt, Marisa Blake.

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Systematics of North American Astereae.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Systematics of North American Astereae./
作者:	Szubryt, Marisa Blake.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	146 p.
附註:	Source: Masters Abstracts International, Volume: 82-04.
Contained By:	Masters Abstracts International82-04.
標題:	Biology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28022557
ISBN:	9798678161307

Systematics of North American Astereae.
Szubryt, Marisa Blake.

Systematics of North American Astereae. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 146 p.

Source: Masters Abstracts International, Volume: 82-04.

Thesis (M.S.)--Southern Illinois University at Carbondale, 2020.

This item must not be sold to any third party vendors.

The North American Astereae clade (Asteraceae: Astereae) represents an ecologically important lineage whose species frequently comprise early to mid-successional ecosystems primarily throughout the United States. In the eastern U.S., most species are perennial suffrutescent herbs whereas many in the western U.S. are shrubs or subshrubs, particularly in the Solidagininae s.l. The delimitation of this subtribe, however, has remained unclear as molecular phylogenetics have not resolved whether the Solidagininae s.s. and another clade, the Gutierrezia lineage, collectively form the Solidagininae s.l. To evaluate the relationships among and within these lineages, high-throughput sequencing was employed across the North American Astereae. High throughput sequencing was also used to clarify relationships of one taxonomically contentious genus within the Gutierrezia lineage, Euthamia. Additional Euthamia specimens were amplified via polymerase chain reactions for sequencing two loci to increase phylogenetic sampling within the genus. Subsequent species delimitations based on molecular phylogenetics and morphological evaluations from literature were used to model species distributions through ecological niche modeling. Niche comparisons via the R package 'Humboldt' further assessed whether the most closely related species differed considerably in their environmental niche occupation. These collectively outlined the distributions of all nine Euthamia species and indicated that hypothetical sister taxa have diverged environmentally for both allopatric and sympatric species.

ISBN: 9798678161307Subjects--Topical Terms:

522710
Biology.
Subjects--Index Terms:

Astereae

Systematics of North American Astereae.
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520 $a The North American Astereae clade (Asteraceae: Astereae) represents an ecologically important lineage whose species frequently comprise early to mid-successional ecosystems primarily throughout the United States. In the eastern U.S., most species are perennial suffrutescent herbs whereas many in the western U.S. are shrubs or subshrubs, particularly in the Solidagininae s.l. The delimitation of this subtribe, however, has remained unclear as molecular phylogenetics have not resolved whether the Solidagininae s.s. and another clade, the Gutierrezia lineage, collectively form the Solidagininae s.l. To evaluate the relationships among and within these lineages, high-throughput sequencing was employed across the North American Astereae. High throughput sequencing was also used to clarify relationships of one taxonomically contentious genus within the Gutierrezia lineage, Euthamia. Additional Euthamia specimens were amplified via polymerase chain reactions for sequencing two loci to increase phylogenetic sampling within the genus. Subsequent species delimitations based on molecular phylogenetics and morphological evaluations from literature were used to model species distributions through ecological niche modeling. Niche comparisons via the R package 'Humboldt' further assessed whether the most closely related species differed considerably in their environmental niche occupation. These collectively outlined the distributions of all nine Euthamia species and indicated that hypothetical sister taxa have diverged environmentally for both allopatric and sympatric species.
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