Data from: Seasonality determines patterns of growth and age structure over a geographic gradient in an ectothermic vertebrate ...

• Main Authors: Merilä, Juha, Hjernquist, Mårten B., Söderman, Fredrik, Jönsson, K. Ingemar, Herczeg, Gábor, Laurila, Anssi
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: Rana temporaria; age; latitudinal gradients; skeletochronology; Scandinavia; Tive; Northern Finland
• Online Access: https://dx.doi.org/10.5061/dryad.qz612jmbk; https://datadryad.org/stash/dataset/doi:10.5061/dryad.qz612jmbk

Environmental variation connected with sea- sonality is likely to affect the evolution of life-history strategies in ectotherms, but there is no consensus as to how important life-history traits like body size are influ- enced by environmental variation along seasonal gradients. We compared adult body size, skeletal growth, mean age, age at first reproduction and longevity among 11 common frog (Rana temporaria) populations sampled along a 1,600-km-long latitudinal gradient across Scandinavia. Mean age, age at first reproduction and longevity increased linearly with decreasing growth season length. Lifetime activity (i.e. the estimated number of active days during life-time) was highest at mid-latitudes and females had on average more active days throughout their lives than males. Variation in body size was due to differences in lifetime activity among populations—individuals (especially females) were largest where they had the longest cumula- tive activity period—as well as to differences between populations ... : Field collected data on adult common frogs from 11 locations along a 1600 km latitudinal gradient from southern Sweden to northern Finland. Ages of collected individuals were estimated with skeletochronological methods in laboratory. Available are also e.g. body sizes (snout-vent lenghts) and weighs of the individuals. ...