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Does testis weight decline towards the Subarctic? A case study on the common frog, Rana temporaria

Hettyey, A; Laurila, A; Herczeg, G; Jönsson, Ingemar LU ; Kovacs, T and Merila, H (2005) In Naturwissenschaften 92(4). p.188-192
Abstract
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 - ameasure 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... (More)
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 - ameasure 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Naturwissenschaften
volume
92
issue
4
pages
188 - 192
publisher
Springer
external identifiers
  • wos:000228729700008
  • pmid:15765211
  • scopus:18744373905
ISSN
1432-1904
DOI
10.1007/s00114-005-0607-3
language
English
LU publication?
yes
id
58473a46-bde5-4a2a-87e8-f64516167e9d (old id 244288)
date added to LUP
2007-08-08 15:41:03
date last changed
2017-10-29 04:23:35
@article{58473a46-bde5-4a2a-87e8-f64516167e9d,
  abstract     = {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 - ameasure 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.},
  author       = {Hettyey, A and Laurila, A and Herczeg, G and Jönsson, Ingemar and Kovacs, T and Merila, H},
  issn         = {1432-1904},
  language     = {eng},
  number       = {4},
  pages        = {188--192},
  publisher    = {Springer},
  series       = {Naturwissenschaften},
  title        = {Does testis weight decline towards the Subarctic? A case study on the common frog, Rana temporaria},
  url          = {http://dx.doi.org/10.1007/s00114-005-0607-3},
  volume       = {92},
  year         = {2005},
}