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Spatial ecology of an apex predator, the perentie, in arid Australia

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posted on 2022-10-20, 01:09 authored by Kari Franziska Soennichsen

Animals are thought to use space non-randomly in relation to key resources that may change over time. Understanding these movements and the space use of wide-ranging species is particularly challenging. I studied the spatial ecology of Australia’s largest lizard, the perentie (Varanus giganteus), in the southwest Northern Territory of Australia using radio telemetry. I asked how home range size varies intraspecifically and examined the effect of individual (sex, mass and snout-vent-length) and environmental factors (month, season, mean temperature, rainfall) on the temporal movement patterns in 25 perenties over a 25-month period using minimum convex polygon and kernel density home range estimates. The perenties were highly mobile with home ranges among the largest recorded for terrestrial ectotherms. Male perenties had significantly larger home ranges and travelled longer daily distances compared to females. Home ranges for both sexes frequently overlapped spatially and were consistent across multiple years. Minimum temperature was a significant predictor for monthly variation in daily distances travelled, underscoring the importance of temperature for perentie movement. This study provides novel insight into the ecology of the perentie, an apex reptilian predator. Its extensive space use challenges our perception of the energetics and movement patterns of large predatory reptiles. 

History

Table of Contents

Background -- Methods -- Results -- Discussion -- References -- Supplementary material

Notes

A thesis submitted in partial fulfilment of the requirements for the degree of Master of Research

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

Thesis (MRes), Macquarie University, Department of Biological Sciences, 2021

Department, Centre or School

Department of Biological Sciences

Year of Award

2021

Principal Supervisor

Martin Whiting

Additional Supervisor 1

Simon Clulow

Additional Supervisor 2

J. Sean Doody

Rights

Copyright: The Author Copyright disclaimer: https://www.mq.edu.au/copyright-disclaimer

Language

English

Extent

61 pages

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