Publication Date

2024

Document Type

Book

Description

For over 30 years, rapid amphibian species decline and extinction has been a global phenomenon; more than 70% of the world’s amphibian species are now declining. A major cause of amphibian decline is reproductive failure, which can be due to endocrine-disrupting chemicals and subsequent hormonal and/or sex organ abnormalities. This study aims to understand the effects of varying hormone concentrations on the testicular physiology of male wood frogs (Rana sylvatica). To do so, this research examined testicular histology slides of R. sylvatica (n = 104) males collected from suburban and rural vernal ponds in southern Connecticut. Various testicular structures were quantified as a proxy for reproductive preparedness and output. These results were then compared to the frog’s corresponding testosterone and estradiol concentrations. By understanding the fundamental relationship between reproductive physiology and reproductive success, we will gain the knowledge needed to ensure that amphibian populations can thrive despite human impacts.

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Effect of Hormone Concentrations on Wood Frog (Rana sylvatica) Testicular Physiology

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