Repeatability of locomotor performance and morphology-locomotor performance relationships

Conradsen, Cara, Walker, Jeffrey A., Perna, Catherine and McGuigan, Katrina (2016) Repeatability of locomotor performance and morphology-locomotor performance relationships. Journal of Experimental Biology, 219 18: 2888-2897. doi:10.1242/jeb.141259

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Author Conradsen, Cara
Walker, Jeffrey A.
Perna, Catherine
McGuigan, Katrina
Title Repeatability of locomotor performance and morphology-locomotor performance relationships
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 2016-09-21
Year available 2016
Sub-type Article (original research)
DOI 10.1242/jeb.141259
Open Access Status File (Publisher version)
Volume 219
Issue 18
Start page 2888
End page 2897
Total pages 10
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Language eng
Abstract There is good evidence that natural selection drives the evolution of locomotor performance, but the processes that generate the among-individual variation for selection to act on are relatively poorly understood. We measured prolonged swimming performance, U-crit, and morphology in a large cohort (n=461) of wild-type zebrafish (Danio rerio) at similar to 6 months and again at similar to 9 months. Using mixed-model analyses to estimate repeatability as the intraclass correlation coefficient, we determined that U-crit was significantly repeatable (r=0.55; 95% CI: 0.45-0.64). Performance differences between the sexes (males 12% faster than females) and changes with age (decreasing 0.07% per day) both contributed to variation in U-crit and, therefore, the repeatability estimate. Accounting for mean differences between sexes within the model decreased the estimate of U-crit repeatability to 21% below the naive estimate, while fitting age in the models increased the estimate to 14% above the naive estimate. Greater consideration of factors such as age and sex is therefore necessary for the interpretation of performance repeatability in wild populations. Body shape significantly predicted U-crit in both sexes in both assays, with the morphology-performance relationship significantly repeatable at the population level. However, morphology was more strongly predicative of performance in older fish, suggesting a change in the contribution of morphology relative to other factors such as physiology and behaviour. The morphology-performance relationship changed with age to a greater extent in males than females.
Formatted abstract
There is good evidence that natural selection drives the evolution of locomotor performance, but the processes that generate the among-individual variation for selection to act on are relatively poorly understood. We measured prolonged swimming performance, Ucrit, and morphology in a large cohort (n=461) of wild-type zebrafish (Danio rerio) at 6 months and again at 9 months. Using mixedmodel analyses to estimate repeatability as the intraclass correlation coefficient, we determined that Ucrit was significantly repeatable (r=0.55; 95% CI: 0.45-0.64). Performance differences between the sexes (males 12% faster than females) and changes with age (decreasing 0.07% per day) both contributed to variation in Ucrit and, therefore, the repeatability estimate. Accounting for mean differences between sexes within the model decreased the estimate of Ucrit repeatability to 21% below the naïve estimate, while fitting age in the models increased the estimate to 14% above the naïve estimate. Greater consideration of factors such as age and sex is therefore necessary for the interpretation of performance repeatability in wild populations. Body shape significantly predicted Ucrit in both sexes in both assays, with the morphology-performance relationship significantly repeatable at the population level. However, morphology was more strongly predicative of performance in older fish, suggesting a change in the contribution of morphology relative to other factors such as physiology and behaviour. The morphology-performance relationship changed with age to a greater extent in males than females.
Keyword Danio rerio
Mixed models
Ontogeny
Performance landscape
Prolonged swimming
Ucrit
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID FT110100724
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Biological Sciences Publications
 
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