Abstract
There is growing evidence across taxa for a mortality-growth rate tradeoff, however the extent to which individuals experience selection both for and against growing faster in the wild can be difficult to assess. We used otoliths to assess growth rates in the wild for Xiphophorus multilineatus, a species of swordtail fish with genetically influenced male alternative reproductive tactics. The ARTs are thought to be maintained due to a trade-off between a higher probability of reaching sexual maturity (smaller sneaker males) and maturing later as a large male with higher mating success (larger courter males). We show that the early juvenile growth rates of the subadult courter males were faster as compared to the other juveniles, potentially suggesting selection for growing faster to increase the probability of reaching sexual maturity. However, variance in the early juvenile growth rates of adult courter males was reduced (truncating high values) as compared to the subadult courter males and overall growth rates were faster in the subadult courter males than the adult courter males. These results support a cost of growing faster as juveniles: reduced longevity as an adult. We also detected a negative relationship between the early growth rates of females and their age, further supporting a longevity cost to growing faster. While both male ARTs are likely to experience stabilizing selection on growth rates, the differences between the morphs in how they optimize this tradeoff in relation to overall fitness (courters optimize growing faster to increase probability of reaching sexual maturity, sneakers optimize longevity as adults) has the potential to lead to disruptive selection between the ARTs on growth rates. We show that the data collected here is consistent with the “growth-mortality optimization” hypothesis and highlight some of the challenges that stabilizing selection presents for examining adaptive variation of growth rates in a natural environment.
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Acknowledgements
We thank Lisa Bono for advice on assessing the otoliths, and Neil Metcalfe for comments on a previous version of the manuscript. This research was supported by a STINT grant from Sweden (Grant No. IG2012-5089) (PI Jessica K. Abbott), PURF grant from Ohio University (Grant No. 2017-2018) (to M. Luke Weinstein) and a PACE grant (Grant No. MM6185116) (to Molly R. Morris). Oscar Rios-Cardenas was supported by a Sabbatical scholarship from the CONACYT during the writing of this paper. Fish were collected in Mexico under the permit Pesca de Fomento No. DGOPA 23857.031215.12071, and all work was approved by the Ohio University Animal Care and Ethics committee (IACUC 12-L-042).
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Weinstein, M., Liotta, M.N., Solitt, A. et al. Selection on growth rates via a trade-off between survival to sexual maturity and longevity in the swordtail fish Xiphophorus multilineatus. Evol Ecol 33, 549–566 (2019). https://doi.org/10.1007/s10682-019-09989-w
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DOI: https://doi.org/10.1007/s10682-019-09989-w