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Persistence of an isolated population of the temperate coral Plesiastrea versipora

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thesis
posted on 29.03.2022, 02:57 by Sheena N. Su
Successful establishment of new populations outside present geographical ranges requires the capacity for species to both disperse to and persist in isolated patches. By definition, dispersal to such patches is typically rare or sporadic, making individual-level growth and survival and self-recruitment key to population persistence. To better understand the demographic processes that lead to the long-term establishment of species in isolated patches, I studied a genetically isolated population of the reef coral Plesiastrea versipora in Sydney Harbour. I hypothesized that persistence of the population was due to either high levels of reproduction and self-recruitment or high levels of growth and survivorship that could buffer population decline. I used a size-based adaption of the Leslie matrix model to combine field-measured demographic rates and size structure data in order to quantify intrinsic population growth rate and sensitivities to changes in demographic contributions of different size classes. The results show that persistence of P. versipora population relies mostly on yearly survival, especially in larger more fecund colonies, and is less reliant on recruitment. The ‘persistent’ demographic strategy identified in this study may be key to establishing new sub-populations outside native ranges as well as maintaining existing populations during periods of environmental change, especially when dispersal is diminished or unpredictable.

History

Alternative Title

Population dynamics of Plesiastrea versipora.

Table of Contents

Introduction -- Methodology -- Results -- Discussion.

Notes

Bibliography: leaves 13-15 Theoretical thesis. Spine title: Population dynamics of Plesiastrea versipora.

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

2015

Principal Supervisor

Joshua Madin

Rights

Copyright Sheena N. Su 2014. Copyright disclaimer: http://mq.edu.au/library/copyright

Language

English

Jurisdiction

New South Wales

Extent

1 online resource (1 online resource (iii, 35 leaves)) illustrations (some colour)

Former Identifiers

mq:69739 http://hdl.handle.net/1959.14/1257294