Temperature effects on blood gases in embryonic American alligators (Alligator mississippiensis).

Autor: Crossley DA 2nd; Department of Biological Sciences, University of North Texas, Denton, TX, USA. Electronic address: dane.crossley@unt.edu., Crossley JL; Department of Biological Sciences, University of North Texas, Denton, TX, USA., Conner JL; Department of Biological Sciences, University of North Texas, Denton, TX, USA., Smith B; Department of Biological Sciences, University of North Texas, Denton, TX, USA., Elsey R; Department of Wildlife and Fisheries, Grand Chenier Louisiana, USA., Nelson D; Department of Biological Sciences, University of North Texas, Denton, TX, USA., Wang T; Zoophysiology, Department of Biology, Aarhus University, Denmark.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [Comp Biochem Physiol A Mol Integr Physiol] 2024 Nov; Vol. 297, pp. 111733. Date of Electronic Publication: 2024 Aug 29.
DOI: 10.1016/j.cbpa.2024.111733
Abstrakt: Numerous studies report on the influence of temperature on blood gases in ectothermic vertebrates, but there is merely a cursory understanding of these effects in developing animals. Animals that develop in eggs are at the mercy of environmental temperature and are expected to lack the capacity to regulate gas exchange and may regulate blood gases by means of altered conductance for gas exchange. We, therefore, devised a series of studies to characterize the developmental changes in blood gases when embryonic alligators were exposed to 25, 30 and 35 °C. To determine how blood parameters were impacted by changes in embryonic temperature, blood was sampled from the chorioallantoic membrane artery. The blood in the chorioallantoic membrane artery is a mixture of oxygen-poor and oxygen-rich blood, which based on the embryonic vascular anatomy may reflect blood that perfuses the chemoreceptors of the developing animal. Our findings indicate that following a 48 h exposure to 25 °C or 35 °C, there was a positive relationship between CAM artery blood PO 2 , PCO 2 and glucose. However, blood pH suggests embryonic alligators lack an acute regulatory mechanism for adjusting blood pH.
Competing Interests: Declaration of competing interest The authors declare to have no known competing financial interests or personal relationships that could have appeared to influence the data in this manuscript.
(Copyright © 2024. Published by Elsevier Inc.)
Databáze: MEDLINE
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