The decline of a large yellow-footed rock-wallaby (Petrogale xanthopus) colony following a pulse of resource abundance

Sharp, Andy and McCallum, Hamish (2010) The decline of a large yellow-footed rock-wallaby (Petrogale xanthopus) colony following a pulse of resource abundance. Australian Mammalogy, 32 2: 99-107. doi:10.1071/AM08113


Author Sharp, Andy
McCallum, Hamish
Title The decline of a large yellow-footed rock-wallaby (Petrogale xanthopus) colony following a pulse of resource abundance
Journal name Australian Mammalogy   Check publisher's open access policy
ISSN 0310-0049
1836-7402
Publication date 2010
Year available 2010
Sub-type Article (original research)
DOI 10.1071/AM08113
Open Access Status
Volume 32
Issue 2
Start page 99
End page 107
Total pages 9
Place of publication Collingwood, VIC Australia
Publisher C S I R O Publishing
Collection year 2011
Language eng
Subject 1103 Clinical Sciences
1105 Dentistry
Abstract The dynamics of a yellow-footed rock-wallaby (Petrogale xanthopus) colony in central-western Queensland were monitored between spring 1991 and winter 1994. The two years immediately before the study witnessed well above average rainfall, while average rainfall was recorded during the period of the study. Both trapping and standardised visual survey data were modelled using the Jolly-Seber-Cormack (JSC) mark-recapture estimator and the Minta-Mangel (MM) mark-resight estimator. The JSC population estimates were considerably lower than those derived from the MM estimator, indicating that the trapping program sampled only a portion of the total population. Nevertheless, a strong degree of correlation existed between both estimators, suggesting that the dynamics of the trappable subpopulation mirrored those of the total population. The colony declined markedly in size throughout the study (103 to 48 individuals, winter 1992 to winter 1994, JSC estimates; 175 to 116 individuals, summer 1993 to winter 1994, MM estimates). No significant correlations (P>0.05) were found between seasonal and/or biannual exponential rates of population increase (r) and environmental variables. Nevertheless, a strong positive correlation was observed between biannual r and short-term rainfall (r=0.90) and pasture conditions (r=0.85-0.93), suggesting that the colony was influenced to some extent by fluctuations in available resources. Annual r was calculated at -0.29 (1992-93) and 0.49 (1993-94). The marked reduction in colony size suggested that it was declining towards its average carrying capacity, following a strong pulse of recruitment linked to the above-average rainfalls of 1990.
Keyword Exponential rate of population increase
Jolly Seber Cormack population estimator
Mark recapture
mark-resight
Minta Mangel population estimator
population dynamics
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
Versions
Version Filter Type
Citation counts: Scopus Citation Count Cited 6 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Wed, 27 Nov 2013, 14:09:59 EST by System User on behalf of School of Integrative Systems