Mismatch between ectotherm thermal preferenda and optima for swimming: a test of the evolutionary pace hypothesis

0441385 - ÚBO 2016 RIV US eng J - Journal Article
Gvoždík, Lumír
Mismatch between ectotherm thermal preferenda and optima for swimming: a test of the evolutionary pace hypothesis.
Evolutionary Biology. Roč. 42, č. 2 (2015), s. 137-145. ISSN 0071-3260. E-ISSN 1934-2845
R&D Projects: GA ČR GAP506/10/2170
Institutional support: RVO:68081766
Keywords : Amphibia * Coadaptation * Evolutionary rates * Newts * Preferred body temperatures * Thermal performance curves * Thermal sensitivity
Subject RIV: EG - Zoology
Impact factor: 2.267, year: 2015

A continuing issue in evolutionary thermal biology is the mismatch between preferred body temperatures (Tpref) and optimal temperatures (Topt) for whole-animal performance. Using phylogenetic comparative analyses, I examined the hypothesis that a difference in the rates at which Tpref and Topt evolve causes the mismatch in a lineage of European newts. In a laboratory thermal gradient, newts maintained body temperatures that were on average 8°C below Topt for maximum swimming velocity. The lower boundary of the Tpref range evolved faster than the mean Tpref, the upper boundary of the Tpref range, and Topt. The strong evolutionary co-variation between mean Tpref and its boundaries prevented the shift of mean Tpref away from Topt. This suggests that the variation in evolutionary rates has a limited potential to modify the disparity between thermal optima and preferenda.
Permanent Link: http://hdl.handle.net/11104/0244395