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Failure to respond to food resource decline has catastrophic consequences for koalas in a high-density population in southern Australia_CQU.pdf (6.59 MB)
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Failure to respond to food resource decline has catastrophic consequences for koalas in a high-density population in southern Australia

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journal contribution
posted on 2023-03-06, 23:53 authored by Desley A Whisson, Victoria Dixon, Megan L Taylor, Alistair Melzer
Understanding the ability of koalas to respond to changes in their environment is critical for conservation of the species and their habitat. We monitored the behavioural response of koalas to declining food resources in manna gum (Eucalyptus viminalis) woodland at Cape Otway, Victoria, Australia, from September 2011 to November 2013. Over this period, koala population density increased from 10.1 to 18.4 koalas.ha-1. As a result of the high browsing pressure of this population, manna gum canopy condition declined with 71.4% manna gum being completely or highly defoliated in September 2013. Despite declining food resources, radio collared koalas (N = 30) exhibited high fidelity to small ranges (0.4-1.2 ha). When trees became severely defoliated in September 2013, koalas moved relatively short distances from their former ranges (mean predicted change in range centroid = 144 m) and remained in areas of 0.9 to 1.0 ha. This was despite the high connectivity of most manna gum woodland, and close proximity of the study site (< 3 km) to the contiguous mixed forest of the Great Otway National Park. Limited movement had catastrophic consequences for koalas with 71% (15/21) of radio collared koalas dying from starvation or being euthanased due to their poor condition between September and November 2013.

History

Volume

11

Issue

1

Start Page

1

End Page

12

Number of Pages

12

eISSN

1932-6203

ISSN

1932-6203

Location

United States

Publisher

Public Library of Science

Publisher License

CC BY

Additional Rights

CC BY 4.0

Language

eng

Peer Reviewed

  • Yes

Open Access

  • Yes

Acceptance Date

2015-11-17

External Author Affiliations

Deakin University

Era Eligible

  • Yes

Medium

Electronic-eCollection

Journal

PLoS ONE

Article Number

e0144348