Literaturdatenbank
Literaturdatenbank |
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Du, W.-G., Zhao, B., & Shine, R. (2010). Embryos in the fast lane: high-temperature heart rates of turtles decline after hatching. PLoS ONE, 5(3), e9557.
Added by: Sarina Wunderlich (30 Jun 2012 22:00:50 UTC) |
| Resource type: Journal Article DOI: 10.1371/journal.pone.0009557 BibTeX citation key: Du2010a View all bibliographic details  |
Categories: General Keywords: Chrysemys, Chrysemys picta, Emydidae, Graptemys, Graptemys geographica, Graptemys pseudogeographica, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Du, Shine, Zhao Collection: PLoS ONE |
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| Abstract |
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In ectotherms such as turtles, the relationship between cardiovascular function and temperature may be subject to different selective pressures in different life-history stages. Because embryos benefit by developing as rapidly as possible, and can “afford” to expend energy to do so (because they have access to the yolk for nutrition), they benefit from rapid heart (and thus, developmental) rates. In contrast, hatchlings do not have a guaranteed food supply, and maximal growth rates may not enhance fitness—and so, we might expect a lower heart rate, especially at high temperatures where metabolic costs are greatest. Our data on two species of emydid turtles, Chrysemys picta, and Graptemys pseudogeographica kohnii, support these predictions. Heart rates of embryos and hatchlings were similar at low temperatures, but heart rates at higher temperatures were much greater before than after hatching.
Added by: Sarina Wunderlich |