The Physiological Basis of Geographic Variation in Rates of Embryonic Development within a Widespread Lizard Species

dc.contributor.author Du, Wei-Guo
dc.contributor.author Warner, Daniel
dc.contributor.author Langkilde, Tracy
dc.contributor.author Robbins, Travis
dc.contributor.author Shine, Richard
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date 2018-07-24T17:00:58.000
dc.date.accessioned 2020-06-30T02:17:49Z
dc.date.available 2020-06-30T02:17:49Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2010
dc.date.issued 2010-10-01
dc.description.abstract <p>The duration of embryonic development (e.g., egg incubation period) is a critical life‐history variable because it affects both the amount of time that an embryo is exposed to conditions within the nest and the seasonal timing of hatching. Variation in incubation periods among oviparous reptiles might result from variation in either the amount of embryogenesis completed before laying or the subsequent developmental rates of embryos. Selection on incubation duration could change either of those traits. We examined embryonic development of fence lizards (<em>Sceloporus undulatus</em>) from three populations (Indiana, Mississippi, and Florida) that occur at different latitudes and therefore experience different temperatures and season lengths. These data reveal countergradient variation: at identical temperatures in the laboratory, incubation periods were shorter for lizards from cooler areas. This variation was not related to stage at oviposition; eggs of all populations were laid at similar developmental stages. Instead, embryonic development proceeded more rapidly in cooler‐climate populations, compensating for the delayed development caused by lower incubation temperatures in the field. The accelerated development appears to occur via an increase in heart mass (and, thus, stroke volume) in one population and an increase in heart rate in the other. Hence, superficially similar adaptations of embryonic developmental rate to local conditions may be generated by dissimilar proximate mechanisms.</p>
dc.description.comments <p>This article is published as Du, Wei-Guo, Daniel A. Warner, Tracy Langkilde, Travis Robbins, and Richard Shine. "The physiological basis of geographic variation in rates of embryonic development within a widespread lizard species." <em>The American Naturalist</em> 176, no. 4 (2010): 522-528. doi: <a href="https://doi.org/10.1086/656270">10.1086/656270</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/eeob_ag_pubs/286/
dc.identifier.articleid 1293
dc.identifier.contextkey 12532118
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_ag_pubs/286
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23163
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_ag_pubs/286/2010_JanzenStudent_PhysiologicalBasis.pdf|||Fri Jan 14 23:11:41 UTC 2022
dc.source.uri 10.1086/656270
dc.subject.disciplines Animal Sciences
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Population Biology
dc.subject.keywords countergradient variation
dc.subject.keywords incubation period
dc.subject.keywords heart rate
dc.subject.keywords heart size
dc.subject.keywords metabolic rate
dc.subject.keywords Sceloporus undulatus
dc.title The Physiological Basis of Geographic Variation in Rates of Embryonic Development within a Widespread Lizard Species
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 6fa4d3a0-d4c9-4940-945f-9e5923aed691
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