Facultative geophagy at natural licks in an Australian marsupial

Best, Emily C., Joseph, Julia and Goldizen, Anne W. (2013) Facultative geophagy at natural licks in an Australian marsupial. Journal of Mammalogy, 94 6: 1237-1247. doi:10.1644/13-MAMM-A-054.1

Author Best, Emily C.
Joseph, Julia
Goldizen, Anne W.
Title Facultative geophagy at natural licks in an Australian marsupial
Journal name Journal of Mammalogy   Check publisher's open access policy
ISSN 0022-2372
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1644/13-MAMM-A-054.1
Open Access Status Not yet assessed
Volume 94
Issue 6
Start page 1237
End page 1247
Total pages 11
Place of publication Provo, UT United States
Publisher American Society of Mammalogists
Language eng
Subject 1103 Clinical Sciences
1105 Dentistry
1311 Genetics
2303 Ecology
2309 Nature and Landscape Conservation
Abstract For many herbivorous mammal species across the world, geophagy, the consumption of soil, is an important method for obtaining minerals, especially sodium. However, this behavior has not been recorded in marsupials. The eastern grey kangaroo (Macropus giganteus), an intensively studied macropod species, is known to use physiological and micromorphological adaptations to conserve sodium. We present results of another adaptation, the use of natural licks, by this species and 3 other macropod species at Sundown National Park, Australia. Natural licks had significantly higher levels of sodium, magnesium, and sulfur than surrounding soils. We examined patterns of lick use by kangaroos to test 3 possible proximate causes of geophagy: whether lick use was affected by dietary mineral content, life-history stage, and thermoregulation. The number of kangaroos visiting the licks increased with temperature and mean cloud cover, varied among months, and was marginally significantly influenced by dietary mineral content. Visit durations to one lick increased with temperature and were influenced by month and life-history stage; females with high lactation demand and large males spent the most time at the lick. The proportion of time spent in geophagy when at a focal lick varied with month and reproductive state. Therefore geophagy is not restricted to eutherian mammals, and kangaroos, like many eutherian species, appear to adjust this behavior in response to their mineral demand. Geophagy in kangaroos is facultative, rather than obligative, and has not been detected in other intensively studied populations. In areas of Australia with low levels of sodium, high temperatures, and suitable lick sites, geophagy may play a key role in marsupial ecology.
Keyword Eastern Grey Kangaroo (Macropus giganteus)
Macropus giganteus
Mineral homeostasis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
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