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Adaptation and Differentiation in In...

McGoey, Brechann.

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Adaptation and Differentiation in Introduced Plant Species.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Adaptation and Differentiation in Introduced Plant Species./
Author:	McGoey, Brechann.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	137 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
Contained By:	Dissertations Abstracts International80-10B.
Subject:	Evolution and Development. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10980076
ISBN:	9781392015636

Adaptation and Differentiation in Introduced Plant Species.
McGoey, Brechann.

Adaptation and Differentiation in Introduced Plant Species. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 137 p.

Source: Dissertations Abstracts International, Volume: 80-10, Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2019.

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

Introduced species offer an opportunity to study evolutionary responses in colonizing populations. My dissertation explores local adaptation in two introduced plants, Arabidopsis thaliana and Ambrosia artemisiifolia. North American Arabidopsis populations have a clinal pattern in flowering time, with populations closer to the coast flowering later than those further inland. To test the source of this differentiation, my coauthors and I grew 50 lines from 25 North American populations in a chamber and simulated winter conditions. We found support for the hypothesis that winter precipitation is the selective force driving differentiation among introduced A. thaliana populations. Adaptation can be critical in the ability of a colonizing species to persist and spread. Assessing the adaptive capacity of a population is difficult, and cannot be extrapolated from invasion history or molecular genetic metrics. To estimate the adaptive capacity of A. artemisiifolia populations, I needed to perform controlled crosses. To this end, I developed a system for isolating plants in individual chambers. I then performed crosses for 50 sires with 3 dams each for three native and three invasive populations. This allowed me to isolate estimates of additive genetic variance and generate G matrices for each population. I found that introduced populations did not have a lower ability to respond to selection than native populations. To explore phenotypic divergence in A. artemisiifolia populations, I grew up seeds from 18 introduced and 20 native populations in a common garden. I found parallel clines in flowering time and size. I compared this quantitative differentiation with neutral genetic diversity in 20000+ SNPs. I concluded that the parallel patterns of differentiation seen in native and introduced ragweed are likely the results of local adaptation, and not neutral processes. My thesis integrates multiple approaches and study organisms to investigate the patterns and processes of contemporary adaptation in non-native plants.

ISBN: 9781392015636Subjects--Topical Terms:

3422373
Evolution and Development.

Adaptation and Differentiation in Introduced Plant Species.
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300 $a 137 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-10, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Stinchcombe, John R.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Introduced species offer an opportunity to study evolutionary responses in colonizing populations. My dissertation explores local adaptation in two introduced plants, Arabidopsis thaliana and Ambrosia artemisiifolia. North American Arabidopsis populations have a clinal pattern in flowering time, with populations closer to the coast flowering later than those further inland. To test the source of this differentiation, my coauthors and I grew 50 lines from 25 North American populations in a chamber and simulated winter conditions. We found support for the hypothesis that winter precipitation is the selective force driving differentiation among introduced A. thaliana populations. Adaptation can be critical in the ability of a colonizing species to persist and spread. Assessing the adaptive capacity of a population is difficult, and cannot be extrapolated from invasion history or molecular genetic metrics. To estimate the adaptive capacity of A. artemisiifolia populations, I needed to perform controlled crosses. To this end, I developed a system for isolating plants in individual chambers. I then performed crosses for 50 sires with 3 dams each for three native and three invasive populations. This allowed me to isolate estimates of additive genetic variance and generate G matrices for each population. I found that introduced populations did not have a lower ability to respond to selection than native populations. To explore phenotypic divergence in A. artemisiifolia populations, I grew up seeds from 18 introduced and 20 native populations in a common garden. I found parallel clines in flowering time and size. I compared this quantitative differentiation with neutral genetic diversity in 20000+ SNPs. I concluded that the parallel patterns of differentiation seen in native and introduced ragweed are likely the results of local adaptation, and not neutral processes. My thesis integrates multiple approaches and study organisms to investigate the patterns and processes of contemporary adaptation in non-native plants.
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