Environmental influence on yolk steroids in American alligators (Alligator mississippiensis)

Biology of Reproduction
H J HamlinLouis J Guillette

Abstract

The egg yolk serves as a significant source of maternally derived steroids that are available to the embryo during early development. Altered deposition of yolk steroids can change the developmental trajectory of the embryo and have long lasting or permanent consequences. Alligators from contaminated environments have shown significant reproductive and developmental dysfunction, and it is unclear if altered deposition of yolk steroids could be a contributing factor. Alligator eggs were collected from Lake Woodruff (a reference lake), Lake Apopka (a site of known agricultural contamination), and the Merritt Island National Wildlife Refuge (MINWR) (home of the Kennedy Space Center and a site of heavy metal contamination). The yolks of eggs at embryonic stages 12 (prior to sex determination) and 24 (post-sex determination) were evaluated for concentrations of progesterone, 17-beta estradiol, and testosterone. Yolk concentrations of progesterone were significantly lower at embryonic stage 12 in eggs from Lake Apopka and MINWR when compared to eggs from Lake Woodruff. Yolk concentrations of 17-beta estradiol were significantly lower at embryonic stage 12 in eggs from MINWR when compared to the other two sites. Reductions in yolk 17-...Continue Reading

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Citations

Feb 25, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Laura M ParsleySusan M Jones
May 21, 2011·Respiratory Physiology & Neurobiology·Warren W Burggren, Kelly S Reyna
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Dec 14, 2019·Ecotoxicology and Environmental Safety·Frances M NilsenTracey B Schock
May 12, 2019·Environment International·Frances M NilsenTracey B Schock

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Software Mentioned

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