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Evolution and ecology of two iconic Australian clades: the Meliphagidae (birds) and the Hakeinae (plants)

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posted on 28.03.2022, 22:56 by Eliot T. Miller
The first theme of this dissertation explores the evolution of two iconic groups of species through Australian climate space: the Meliphagidae, or honeyeaters, which are primarily nectar-feeding birds, and the Hakeinae, a section of the plant family Proteaceae. Both groups are inferred to have had their origins in Gondwanan rainforests that were widespread across Australia 45 million years ago and then diversified into more arid environments as the continent’s climate became more arid. Accordingly, dry environments are inhabited by closely related (phylogenetically clustered) sets of species, although, in contrast to the honeyeaters, Hakeinae communities are characterized by more localized diversification. The impressive and rapid Hakeinae diversification may have been driven by specialization onto a variety of highly weathered, nutrient-poor soil types on the ancient Australian landmass. The second theme of this dissertation reviews a variety of methods to assess the phylogenetic structure of communities, such as local assemblages of honeyeaters and Hakeinae. Many published methods were found to be redundant, and some of the truly unique approaches do not measure what they purport to. Accordingly, only a small subset of phylogenetic community structure methods have merit. In the third theme of the dissertation, observations on foraging by 74 of 75 Australian honeyeater species are used to explore patterns of community assembly. Australian honeyeater communities reflect both stochastic and deterministic processes. Co-occurring species exhibit substantial overlap in foraging niche space, in contrast to assembly theory based on competition, which predicts minimal similarity among co-occurring species. At the same time, species tend to occupy characteristic portions of niche space and available niche space is smaller in the arid regions of the continent. Within this smaller available niche space, arid-zone species tend to be more widely separated in niche space than species in more mesic environments.

History

Alternative Title

Evolution and ecology of Meliphagidae and Hakeinae

Table of Contents

1. Introduction and scope of thesis -- 2. Niche conservatism constrains assemblages -- 3. Phylogenetic community structure methods -- 4. Hakeinae: in and out of the rainforest -- 5. Does competition matter? -- 6. General discussion.

Notes

"A dissertation submitted to the Higher Degree Research Office at Macquarie University in partial fulfillment of the requirements for the degree Doctor of Philosophy in the lab of Mark Westoby Department of Biological Sciences February, 2015" Includes bibliographical references Thesis by publication. Thesis produced within a cotutelle arrangement between Macquarie University and University of Missouri, St. Louis.

Awarding Institution

Macquarie University

Degree Type

Thesis PhD

Degree

PhD, Macquarie University, Faculty of Science and Engineering, Department of Biological Sciences

Department, Centre or School

Department of Biological Sciences

Year of Award

2015

Principal Supervisor

Mark Westoby

Additional Supervisor 1

Robert Ricklefs

Rights

Copyright Eliot T. Miller 2015. Copyright disclaimer: http://www.copyright.mq.edu.au

Language

English

Jurisdiction

Australia

Extent

1 online resource (297 pages) colour illustrations, colour maps

Former Identifiers

mq:44201 http://hdl.handle.net/1959.14/1067195