Growth and behavioural development of the fawn-footed mosaic-tailed rat (Melomys cervinipes)
Misha K. Rowell
A B C and Tasmin L. Rymer A B
A College of Science and Engineering, James Cook University, PO Box 6811, Cairns, Qld 4870, Australia.
B Centre for Tropical Environmental and Sustainability Sciences, James Cook University, PO Box 6811, Cairns, Qld 4870, Australia.
C Corresponding author. Email: misha.rowell@my.jcu.edu.au
Australian Mammalogy 43(3) 330-334 https://doi.org/10.1071/AM20037
Submitted: 4 May 2020 Accepted: 28 September 2020 Published: 14 October 2020
Abstract
The fawn-footed mosaic-tailed rat (Melomys cervinipes) is a common Australian rainforest rodent; however, little is known about the growth or behavioural development of individuals of this species. We raised mosaic-tailed rats in captivity to assess the growth and behavioural development of pups from birth until weaning. Pups developed quickly compared with some other Australian species, and there were no significant differences in growth between males and females, except for anogenital distance. The auditory meatus was open by Postnatal Day 5, and eyes were fully opened by Postnatal Day 9. All behaviours, including righting, locomotion, negative geotaxis, climbing and grip reflex, were fully developed by Postnatal Day 6. These results suggest that mosaic-tailed rats are semiprecocial in their physical and behavioural development compared with some native Australian rodent species that are found in arid environments. As females produce few, relatively well-developed young, the population has a low intrinsic rate of natural increase. This may, however, be offset by mosaic-tailed rats producing more litters per year. Understanding the biology of mosaic-tailed rats in general could provide insights into how rarer precocial species might struggle to increase in population size under increasing disturbances.
Keywords: Australian rodent, behavioural development, fawn-footed mosaic-tailed rat, growth, Melomys cervinipes, ontogeny, precocial.
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