Hatching synchrony and survival in early life in the painted turtle, Chrysemys picta

dc.contributor.author Colbert, Paul
dc.date 2019-07-10T02:31:47.000
dc.date.accessioned 2020-06-30T08:12:02Z
dc.date.available 2020-06-30T08:12:02Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2006
dc.date.issued 2006-01-01
dc.description.abstract <p>Synchrony in the timing of births is thought to have evolved as a general predator avoidance strategy. In turtles, synchronous hatching promotes synchronous emergence from the nest and may limit predation by swamping and confusing predators or simply dilute the per capita risk of predation. However, synchronization of hatching in natural nests is complicated by the occurrence of thermal gradients, which promote developmental asynchrony. In the first chapter of the thesis, I examined the potential for hatching synchrony in Chrysemys picta, a species in which the drive to hatch synchronously should be absent because neonates remain in the nest throughout the winter. I also assessed the mechanism by which synchrony occurs and explored potential trade-offs between synchronous hatching and performance. Although hatching synchrony did not occur, underdeveloped embryos attempted to catch-up to more advanced sibs via a mechanism consistent with shortening the incubation period. In addition, a trade-off between hatching synchronously and performance was evident. In the second chapter, I experimentally assessed the influence of accelerated hatching on hatching success, winter survival, and survival during terrestrial migration from the nest. I also examined the effects of incubation temperature on hatching success, and offspring sex and body size (carapace length and hatchling mass) on survival and migration time. Early-hatching individuals did not suffer fitness costs relative to their sibs at any stage considered in this study. Incubation treatment had a significant effect on migration time, but in the opposite direction that we predicted. Incubation temperature did not affect hatching success, and offspring sex did not affect survival when all treatment groups were considered. Incubation treatments significantly influenced offspring body size, which was negatively correlated with migration time, but had no effect on survival during terrestrial migration. Lack of a fitness cost associated with hatching synchrony is consistent with a single, predator avoidance origin for this trait and retention in C. picta via phylogenetic inertia.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/18972/
dc.identifier.articleid 19972
dc.identifier.contextkey 14540969
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/18972
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/72930
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/18972/Colbert_ISU_2006_C65.pdf|||Fri Jan 14 21:48:14 UTC 2022
dc.subject.keywords Ecology and Evolutionary Biology
dc.title Hatching synchrony and survival in early life in the painted turtle, Chrysemys picta
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
thesis.degree.discipline Ecology and Evolutionary Biology
thesis.degree.level thesis
thesis.degree.name Master of Science
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