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Article << Previous     |         Contents Vol 41(2)

Are life-history strategies of Norway rats (Rattus norvegicus) and house mice (Mus musculus) dependent on environmental characteristics?

M. V. Vadell A B, I. E. Gómez Villafañe A B and R. Cavia A B C

A Laboratorio de Ecología de Poblaciones, Departamento, de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, PB II, 4to piso, (C1428EHA) Nuñez, Ciudad Autónoma de Buenos Aires, Argentina.
B Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), UBA-CONICET, Ciudad Universitaria, PB II, 4to piso, (C1428EHA) Nuñez, Ciudad Autónoma de Buenos Aires, Argentina.
C Corresponding author. Email: rcavia@ege.fcen.uba.ar

Wildlife Research 41(2) 172-184 http://dx.doi.org/10.1071/WR14005
Submitted: 8 January 2014  Accepted: 3 July 2014   Published: 4 August 2014

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Context: Life-history theory attempts to explain the way in which an organism is adapted to its environment as well as explaining the differences in life-history strategies among and within species.

Aims: The aim of this paper was to compare life-history traits of the Norway rat and the house mouse living in different habitats and geographic regions so as to find patterns related to environmental characteristics on the basis of published ecological studies conducted before 2011.

Methods: The environments where rodent populations lived were characterised according to climate type, occurrence of freezing temperatures and frost, degree of anthropisation and trapping location. Four demographic characteristics were analysed. A canonical correspondence analysis was performed to explain the effects of environmental variables on the demographic characteristics of rodents. Information was gathered from 35 articles published between 1945 and 2010.

Key results: Most populations of both species showed differences in abundance throughout the year, but no defined pattern was common among populations. The pregnancy rate of Norway rat was highest during spring and autumn in urban environments, during spring and winter in rural environments and during summer in sylvan habitats. House mouse populations were most frequently reported to experience high pregnancy rates during summer. Contrary to urban and rural populations, in sylvan environments the occurrence of a reproductive break was the most commonly reported pattern for both species. Litter size of Norway rat depended on the degree of anthropisation and the occurrence of freezing temperatures and frost. Litter size was greater in rural environments and in areas without freezing temperatures and frost. House mouse did not show differences in litter size resulting from any of the environmental characteristics analysed.

Conclusions: Both species are able to modify their reproductive strategies according to environmental characteristics, especially according to the degree of anthropisation of the environment. In sylvan areas, where animals are more exposed to seasonal changes in weather conditions, changes in reproductive investment are more evident.

Implications: Regarding the implications for rodent control, the best time to apply control measures could be winter in sylvan and urban environments. In rural environments, the best time for conducting control efforts is less clear, although cold seasons seem also to be the best.

Additional keywords: abundance, demography, life-history traits, reproduction.


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