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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/19162

Title: Morphometric and demographic differences between tropical and temperate Norway rats (Rattus norvegicus).
Other Titles: J. Mammal.
Authors: Porter, Fleur H.
Costa, Federico
Rodrigues, Gorete
Farias, Helena
Cunha, Marcelo
Glass, Gregory E., et al.
Keywords: Bergmann’s rule;Invasive species;Norway rat;Rodent control;Urban ecology
Issue Date: 2015
Publisher: American Society of Mammalogists
Abstract: Rattus norvegicus Norway rat)is one of the most abundant and geographically widespread mammals. Ecological studies focusing on urban Norway rat populations are restricted to temperate regions, and data describing populations from tropical cities are lacking. We compared the morphometrics and demographic characteristics of rats captured in urban low-income settlements in Salvador, Brazil, to a season, environmental area of capture, and sex-matched sample from Baltimore, Maryland. Norway rats of both sexes were significantly smaller in Salvador, although the threshold mass marking sexual maturity was equivalent for both cities. Pregnancy rates were comparable (~50%); however, juveniles were commonly trapped in Salvador (20%) while they were rarely trapped in Baltimore during winter months (2%). These findings suggest that tropical and temperate rats differ with respect to body metrics, while size at sexual maturity is similar. Further studies conducted over different seasons are required before any firm conclusions are reached; however, this study provides preliminary support for Bergmann’s rule that species at higher absolute latitude are larger than the same species sampled at lower latitudes.
URI: http://repositorio.ufba.br/ri/handle/ri/19162
ISSN: 1545-1542
Appears in Collections:Artigos Publicados em Periódicos Estrangeiros (ISC)

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