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Biotic interactions affecting the reproductive success of Antarctic beech (Nothofagus moorei)

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posted on 28.03.2022, 11:14 authored by Amy Leigh Smart
Nothofagus moorei (Antarctic Beech) is the dominant canopy tree of many remaining fragments of cool temperate rainforests of northern NSW and south-eastern Queensland. Despite being an iconic species there is a paucity of information (especially quantitative data) concerning life history stages and processes that together determine reproductive success. In this thesis I made significant advances towards closing this knowledge gap. First, pre-dispersal fruit/seed predation by birds and insects was quantified, revealing a decreasing amount of predation later in the masting season - in accordance with the "predator starvation/satiation" hypothesis. Second, the proportion of juveniles that were derived from seed or vegetative regeneration was quantified, both for N. moorei and co-occurring tree species. While there was a higher abundance of seedlings, juveniles of vegetative origin exhibited superior relative height. Third, I quantified the influence of soil-litter disturbing vertebrates on juvenile tree success. While, overall, survivorship and growth were higher in the presence of soil disturbing vertebrates, Antarctic Beech juveniles exhibited enhanced survival when protected from physical disturbance. These findings provide a greater understanding of the mechanisms underpinning stand dynamics and canopy renewal of Antarctic Beech and co-occurring tree species in an ecologically unique vegetation type under increasing threat from climate change.

History

Table of Contents

1. Introduction -- 2. Pre-dispersal seed predation on Mothofagus Moorei -- 3. Regeneration modes of cool temperature rainforest trees -- 4. The effect of vertebrate exclusion on rainforest juveniles -- 5. Discussion.

Notes

Theoretical thesis. Bibliography: pages 59-64

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

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

Department, Centre or School

Department of Biological Sciences

Year of Award

2019

Principal Supervisor

Ian Wright

Rights

Copyright Amy Smart 2019 Copyright disclaimer: http://mq.edu.au/library/copyright

Language

English

Extent

1 online resource (75 pages) illustrations

Former Identifiers

mq:72069 http://hdl.handle.net/1959.14/1281071