Literaturdatenbank
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Davy, C. M., Paterson, J. E., & Leifso, A. E. (2014). When righting is wrong: Performance measures require rank repeatability for estimates of individual fitness. Animal Behavior, 93, 15–23.
Added by: Sarina Wunderlich (06 Jul 2014 16:10:39 UTC) |
| Resource type: Journal Article DOI: http://dx.doi.org/10.1016/j.anbehav.2014.04.013 BibTeX citation key: Davy2014a View all bibliographic details  |
Categories: General Keywords: Homopus signatus, Physiologie - physiology, Schildkröten - turtles + tortoises, Testudinidae, Verhalten - ethology, Zeitigung - incubation Creators: Davy, Leifso, Paterson Collection: Animal Behavior |
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| Abstract |
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Highlights Rank repeatability is an underappreciated requirement of fitness proxies. Righting time in turtles does not meet the requirement of rank repeatability. Individuals and species respond differently to multiple trials of righting time. Variation among trials is high enough to affect the outcome of hypothesis testing. Rank repeatability is critical for any behaviour used to estimate relative fitness or performance. Fitness proxies such as performance measures are used to quantify relative fitness in systems where direct measurements are unobtainable. To provide meaningful results at the individual level, fitness proxies must demonstrate not only repeatability, as measured by high intraclass correlation coefficients, but also rank repeatability. Here we illustrate the importance of rank repeatability in fitness proxies using a commonly employed example: righting time in hatchling turtles. Our results show that individual righting time varies strongly among trials and is not replicable enough to provide repeatable rankings of individuals or clutches. To illustrate the potential implications of this finding, we use our data to test the predication that larger turtles have faster righting times, using three consecutive trials of righting time. The resulting conclusions vary substantially among trials. Thus, we conclude that righting time does not meet the criterion of rank repeatability required for estimates of relative individual fitness, performance or phenotypic quality. Researchers employing similar proxies should assess the rank repeatability of a proxy before applying it to questions of relative individual fitness. If a measure shows satisfactory repeatability, the final test for a fitness proxy is to demonstrate a correlation with actual fitness, ideally in the organism's natural habitat. Keywords Apalone spinifera; Emydoidea (Emys) blandingii; fitness proxy; freshwater turtle; individual repeatability; performance measure; rank correlation; rank repeatability; righting time; righting response
Added by: Sarina Wunderlich |