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Temporal and Biogeographical History...

Zaborsky, John G.

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Temporal and Biogeographical History of the Sesame Family (Pedaliaceae) with a Focus on the Succulent Genera Uncarina and Sesamothamnus.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Temporal and Biogeographical History of the Sesame Family (Pedaliaceae) with a Focus on the Succulent Genera Uncarina and Sesamothamnus./
Author:	Zaborsky, John G.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	129 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
Contained By:	Dissertation Abstracts International79-12B(E).
Subject:	Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10928236
ISBN:	9780438269811

Temporal and Biogeographical History of the Sesame Family (Pedaliaceae) with a Focus on the Succulent Genera Uncarina and Sesamothamnus.
Zaborsky, John G.

Temporal and Biogeographical History of the Sesame Family (Pedaliaceae) with a Focus on the Succulent Genera Uncarina and Sesamothamnus. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 129 p.

Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2018.

The sesame family (Pedaliaceae) is a species-poor (~70 spp. in 14 genera), largely herbaceous family that is primarily distributed across drier regions of Africa with outliers in India, Madagascar, and Australasia. Our research investigates this little-studied and taxonomically complex family in a temporal and biogeographical context. Building on the work of previous authors, we provide a date for the origin of the family using fossil priors of its closest relatives. We show that the Pedaliaceae are a relatively young family, with a crown age of 33.4my. Our dated phylogeny shows that diversification in the family occurred during, and was most likely driven by, the worldwide increase in arid climates during the Miocene Epoch. We analyze the family in a biogeographical context using BioGeoBEARS and show that the family has a southern African origin, as has been long hypothesized. Most of its species are confined to Africa, but we show that there have been range expansions into India, Madagascar, and Australasia as well as into northern Africa. These expansions all occurred during the Miocene as well. We narrow the scope of our research onto the two woody, succulent genera Uncarina and Sesamothamnus . Uncarina, endemic to Madagascar, is one of the most diverse genera in the family and is distributed across the drier regions of the island. We use Next Generation sequencing to elucidate relationships within the genus and show that there is strong discordance between nDNA and cpDNA datasets. While morphological characters help link the clades in both datasets, geography has the strongest signal with clear southern and northern groups being recovered. Within Sesamothamnus, we use Next Generation sequencing methods to better understand and date its origin and diversification. We use these dates to place it in the context of the African Arid Corridor distributional pattern, one shared among many unrelated plants that occupy arid areas in the north and south. Our research adds more evidence that the Miocene aridity played a large role in shaping arid region floras.

ISBN: 9780438269811Subjects--Topical Terms:

516217
Botany.

Temporal and Biogeographical History of the Sesame Family (Pedaliaceae) with a Focus on the Succulent Genera Uncarina and Sesamothamnus.
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520 $a The sesame family (Pedaliaceae) is a species-poor (~70 spp. in 14 genera), largely herbaceous family that is primarily distributed across drier regions of Africa with outliers in India, Madagascar, and Australasia. Our research investigates this little-studied and taxonomically complex family in a temporal and biogeographical context. Building on the work of previous authors, we provide a date for the origin of the family using fossil priors of its closest relatives. We show that the Pedaliaceae are a relatively young family, with a crown age of 33.4my. Our dated phylogeny shows that diversification in the family occurred during, and was most likely driven by, the worldwide increase in arid climates during the Miocene Epoch. We analyze the family in a biogeographical context using BioGeoBEARS and show that the family has a southern African origin, as has been long hypothesized. Most of its species are confined to Africa, but we show that there have been range expansions into India, Madagascar, and Australasia as well as into northern Africa. These expansions all occurred during the Miocene as well. We narrow the scope of our research onto the two woody, succulent genera Uncarina and Sesamothamnus . Uncarina, endemic to Madagascar, is one of the most diverse genera in the family and is distributed across the drier regions of the island. We use Next Generation sequencing to elucidate relationships within the genus and show that there is strong discordance between nDNA and cpDNA datasets. While morphological characters help link the clades in both datasets, geography has the strongest signal with clear southern and northern groups being recovered. Within Sesamothamnus, we use Next Generation sequencing methods to better understand and date its origin and diversification. We use these dates to place it in the context of the African Arid Corridor distributional pattern, one shared among many unrelated plants that occupy arid areas in the north and south. Our research adds more evidence that the Miocene aridity played a large role in shaping arid region floras.
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