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Journal article
Low repeatability of preferred body temperature in four species of Cordylid lizards: Temporal variation and implications for adaptive significance
Evolutionary ecology, v 21(1)
01 Jan 2007
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Abstract
Preferred body temperatures (T-sel) of ectotherms are important for ecological and evolutionary studies. In lizards, the measurement of T (sel) is controversial for several reasons, generally related to hypotheses addressing how T-sel may evolve in the wild. Although seldom explicitly tested, evolutionary hypotheses of adaptation to local climate require that T-sel meets the conditions of natural selection, which include repeatability, heritability and a link to fitness. Here, we investigated repeatability (tau, intra-class correlation coefficient) of T-sel at several time-scales using four Cordylid species from heterogeneous thermal habitats. Although there was significant inter-individual variation within days (P < 0.005 in most cases), there was no significant inter-individual variation when calculated across several days (P > 0.05). Repeatability was low in all species investigated (from 0 to 0.482) when compared against other estimates of repeatability of T-sel in the literature. Irrespective of how T-sel was calculated, it showed inconsistent and variable temporal effects across species. Furthermore, repeatability of T-sel did not change with acclimation to laboratory conditions. These data have implications for understanding the evolution of thermoregulation in these and other ectotherms.
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Details
- Title
- Low repeatability of preferred body temperature in four species of Cordylid lizards: Temporal variation and implications for adaptive significance
- Creators
- Susana Clusella-TrullasJohn S. Terblanche - Stellenbosch UniversityJohannes H. van Wyk - Stellenbosch UniversityJames R. Spotila - Drexel University
- Publication Details
- Evolutionary ecology, v 21(1)
- Publisher
- Springer Nature
- Number of pages
- 17
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:000243905200005
- Scopus ID
- 2-s2.0-33846638364
- Other Identifier
- 991019168528604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Ecology
- Evolutionary Biology
- Genetics & Heredity