Environmental acidification is not associated with altered plasma corticosterone levels in the stream-side salamander, Desmognathus ochrophaeus
Autor: | Sarah K. Woodley, Lauren F. Ricciardella, Peter Freeman |
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Rok vydání: | 2013 |
Předmět: |
Amphibian
endocrine system medicine.medical_specialty Hypothalamo-Hypophyseal System Pituitary-Adrenal System Urodela Environment chemistry.chemical_compound Endocrinology Rivers Corticosterone biology.animal Internal medicine polycyclic compounds medicine Endocrine system Animals Glucocorticoid hormones biology Desmognathus ochrophaeus Hydrogen-Ion Concentration biology.organism_classification chemistry Salamander Animal Science and Zoology Plasma corticosterone Acids hormones hormone substitutes and hormone antagonists Hormone |
Zdroj: | General and comparative endocrinology. 201 |
ISSN: | 1095-6840 |
Popis: | As environments become increasingly altered due to anthropogenic factors, interest is growing in how endocrine systems respond to pollution and environmental degradation. Glucocorticoid hormones (GCs) are a type of stress hormones that are released upon activation of the hypothalamic–pituitary–adrenal axis and have widespread effects throughout the body. We tested the hypothesis that exposure to environmental acidification is associated with altered levels of plasma GCs in adult, stream-side Allegheny Mountain dusky salamanders (Desmognathus ochrophaeus). We compared plasma corticosterone (CORT) in salamanders living in 9 streams that differed in pH. Although capture and handling induced a robust increase in plasma CORT in all populations of salamanders, we discerned no significant effect of environmental pH on baseline CORT or handling-induced CORT levels. In a laboratory study, low pH decreased salamander locomotory activity compared to acid-neutral controls, but there was no effect of pH on plasma CORT. Decreased locomotory activity is a common amphibian response to stress, indicating that low pH has adverse effects on Allegheny Mountain dusky salamanders. Overall, we conclude that the effects of environmental pH on salamander behavior and other potential responses are not mediated by changes in plasma CORT levels. We discuss alternative explanations for our results and describe difficulties involved in searching for relationships between plasma GCs and environmental degradation. |
Databáze: | OpenAIRE |
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