Title
The basis of reproductive seasonality in **Mastomys** rats (Rodentia: Muridae)The basis of reproductive seasonality in **Mastomys** rats (Rodentia: Muridae)
Author
Faculty/Department
Faculty of Sciences. Biology
Research group
Evolutionary ecology group (EVECO)
Department of Biology
Publication type
article
Publication
Aberdeen,
Subject
Chemistry
Biology
Source (journal)
Journal of tropical ecology. - Aberdeen
Volume/pages
10(1994):1, p. 55-66
ISSN
0266-4674
ISI
A1994NB41500004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Reproduction of the African murid genus Mastomys, multimammate rats, is seasonal, starting after the rains and extending well into the dry season. During a two-year study in Tanzania, we tested three hypotheses to investigate the proximal causes of this seasonality. Food availability was no limiting factor since food supply could not induce continuous breeding. Temperature was always high and thus not a restrictive climatic factor. Diet was probably always sufficiently varied and protein-rich to allow reproduction. This contradicts earlier hypotheses that consider Mastomys as an opportunistic breeder in which reproduction is seasonally limited by poor conditions; environmental predictors were believed not to be involved since the animals live in an unpredictably unstable environment. However, although the occurrence of rain may be unpredictable, it is highly predictable that heavy rainfall will be followed by good conditions. Laboratory experiments show that sprouting grass has a stimulatory effect on reproduction, suggesting that breeding is triggered by new vegetation.
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