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Does testis weight decline towards the Subarctic?: a case study on the common frog, Rana temporaria
Ungern.
Uppsala University.
Ungern.
Lund University.ORCID iD: 0000-0002-1732-0372
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2005 (English)In: Die Naturwissenschaften, ISSN 0028-1042, E-ISSN 1432-1904, Vol. 92, no 4, 188-192 p.Article in journal (Refereed) Published
Abstract [en]

Interpopulation comparisons of variation in resource availability and in allocation patterns along altitudinal and latitudinal gradients allow insights into the mechanisms shaping the life history of animals. Patterns of between-population differences in female life history traits have been studied intensively across a wide range of taxa, but similar investigations in males have remained scarce. To study if testis weight-a measure of reproductive investment-varies on a geographical scale in anurans, we focussed on the variation in relative testis weight (RelTW) and asymmetry in 22 populations of the common frog Rana temporaria along a 1,600-km latitudinal transect across the Scandinavian peninsula. We found that RelTW decreased towards the north. Body mass and body length both had independent positive effects on testes mass. We found evidence for directional asymmetry (DA) in testis weight with the right testis being larger than the left. The level of DA in testis weight was not related to latitude, but both body mass and testes mass had independent positive effects on asymmetry. We discuss the northwards decrease in RelTW in terms of a decreased reproductive investment as a possible consequence of harsher environmental conditions, and perhaps also, weaker sexual selection in the north than in the south.

Place, publisher, year, edition, pages
2005. Vol. 92, no 4, 188-192 p.
National Category
Zoology Evolutionary Biology Ecology
Identifiers
URN: urn:nbn:se:hkr:diva-12472DOI: 10.1007/s00114-005-0607-3ISI: 000228729700008PubMedID: 15765211OAI: oai:DiVA.org:hkr-12472DiVA: diva2:735598
Available from: 2014-07-29 Created: 2014-07-29 Last updated: 2017-03-08Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
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