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| DATE | 2016-10-04 |
| FROM | Ruben Safir
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| SUBJECT | Subject: [Learn] another paper on this topic to dig through
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From learn-bounces-at-nylxs.com Tue Oct 4 20:02:28 2016
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Subject: [Learn] another paper on this topic to dig through
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https://open.library.ubc.ca/cIRcle/collections/ubctheses/24/items/1.0073727
another paper on this topic to dig through
The Phylogeny and Evolution of Two
Ancient Lineages of Aquatic Plants
by
William James Donaldson Iles
B.Sc., The University of Toronto, 2005
A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF
THE REQUIREMENTS FOR THE DEGREE OF
DOCTOR OF PHILOSOPHY
in
The Faculty of Graduate Studies
(Botany)
THE UNIVERSITY OF BRITISH COLUMBIA
(Vancouver)
May 2013
c
William James Donaldson Iles 2013
Abstract
In my thesis I aim to improve our phylogenetic and evolutionary knowledge
of two ancient and distantly related groups of aquatic owering plants, Hy-
datellaceae and Alismatales. While the phylogeny of monocots has received
fairly intense scrutiny for two decades, some parts of its diversi cation have
been less frequently investigated. One such lineage is the order Alismatales,
which de nes one of the deepest splits in monocot evolution. Many fami-
lies of Alismatales are aquatic or semi-aquatic, and they have been impli-
cated in historical discussions of monocot origins. I evaluate inter-familial
relationships in the order, considering a suite of 17 plastid genes for 31 Al-
ismatales taxa for all 13 recognized families. This study improves on our
understanding of, and con dence in, higher-order Alismatales relationships.
I also uncovered convergent gene loss of plastid-encoded subunits for the
NADH dehydrogenase complex. I then expand monocot coverage outside
Alismatales by including unpublished and newly sequenced data for other
orders. This large-scale sample facilitated a re-evaluation of monocot phy-
logeny and molecular dating, the latter using 25 fossil constraints. Previ-
ously included in the monocot order Poales, Hydatellaceae are a small family
of ephemeral aquatics relatively recently found to be the sister group of wa-
ter lilies (Cabombaceae and Nymphaeaceae). I present the rst molecular
phylogeny of the family and evaluate aspects of the family's morphological
evolution. I show how sexual system shifts are associated with shifts in other
reproductive traits. I also infer a temporal scale for Hydatellaceae diversi -
cation using a two-step Bayesian approach. I use the resulting dated tree to
address biogeographic patterns and aspects of niche evolution. I show that
its \Gondwanan" distribution is the result of long-distance dispersal and
not continental rifting, and demonstrate strong phylogenetic niche conser-
ii
vatism in the family. These studies expand our understanding of evolution
in Hydatellaceae, and provide a substantial update to our understanding of
Alismatales (and more generally monocot) phylogeny and divergence times.
~~~~~~~~~~~~~~~~~~~~
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