Do common frogs (Rana temporaria) follow Bergmann’s rule?
2005 (English)In: Evolutionary Ecology Research, ISSN 1522-0613, Vol. 7, no 5, 717-731 p.Article in journal (Refereed) Published
Questions: Does intraspecific extension of Bergmanns rule – larger size within a species incooler areas – hold true for ectotherms in general, and for the common frog (Rana temporaria)in particular? What is the relative importance of genetic and environmental factors (i.e. directenvironmental induction) in determining latitudinal patterns of body size variation in commonfrogs?Methods: We tested for a positive association between mean body size and latitude incommon frogs (Rana temporaria) across a 1600 km long latitudinal gradient in Scandinaviaboth for wild-collected adults and laboratory-reared metamorphs.Results: In adults, the mean body size increased from south to mid-latitudes, and declinedthereafter. This occurred despite the fact that the mean age of adult frogs increased withincreasing latitude, and age and body size were positively correlated. The latitudinal pattern ofbody size variation in metamorphs reared in a common garden experiment was similar to thatobserved among wild-caught adults.Conclusions: The results suggest that the concave pattern of body size variation across thelatitudinal cline may be at least partly genetically determined, and that although there isconsiderable geographic variation in mean body size of R. temporaria, this variation does notconform with Bergmann’s rule.
Place, publisher, year, edition, pages
2005. Vol. 7, no 5, 717-731 p.
age, amphibians, body size, cline, growth, latitude, temperature
IdentifiersURN: urn:nbn:se:uu:diva-90160OAI: oai:DiVA.org:uu-90160DiVA: diva2:162411