Diet of the eastern chestnut mouse (Pseudomys gracilicaudatus). I Composition, diversity and individual variation
In: Wildlife research, Band 21, Heft 4, S. 401
ISSN: 1448-5494, 1035-3712
Little is known about the biology and ecology of the eastern chestnut mouse (Pseudomys
gracilicaudatus), let alone the details of its diet. In this paper, we examined the dietary
composition, diversity and variation among individuals of this species in a coastal heathland of
New South Wales, by means of microscopic examination of its faecal pellets. From 200 faecal
samples, P. gracilicaudatus was found to consume considerable amounts of fungi (20% overall)
and insects (over 10% on average). Seed was the most abundant food in its diet from August
to February, accounting for 39%, with stem contributing 28% of the diet. Stem was dominant
at other times, accounting for 34%, with seed contributing 24%. Although cohort-dependent
foraging strategies have been reported in many small mammals, age-dependent foraging only
occurred in autumn; sex-dependent foraging was not observed in P. gracilicaudatus. Analysis of
dietary diversity (H') and among-individual variation (CVp,) showed that there were significant
variations in the diet of P. gracilicaudatus in different seasons and successional stages. Negative
association between H' and CVp, for seasons and vegetation succession suggested that individuals
of P. gracilicaudatus consumed a range of food items, producing maximum dietary diversity.
These results indicate that P. gracilicaudatus is a generalist herbivore, opportunistic in foraging
and less specialised in food selection than any other Pseudomys species reported so far.