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Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding whooping cranes (Grus americana)

May 2, 2016

Reproductive success of endangered whooping cranes (Grus americana) maintained ex situ is poor. As part of an effort to identify potential causes of poor reproductive success in a captive colony, we used non-invasive endocrine monitoring to assess gonadal and adrenal steroids of bird pairs with various reproductive outcomes and evaluated the relationships of hormones and behaviors to reproductive performance. Overall, reproductively successful (i.e., egg laying) females had significantly higher mean estrogen levels but lower mean progestogen concentrations than did unsuccessful females. Other hormones, including glucocorticoids and androgens, were not significantly different between successful and unsuccessful individuals. Observations of specific behaviors such as unison calling, marching, and the number of copulation attempts, along with overall time spent performing reproductive behaviors, were significantly higher in successful pairs. Our findings indicate that overall reproductive performance of whooping crane pairs is linked to female gonadal hormone excretion and reproductive behaviors, but not to altered adrenal hormone production.

Citation Information

Publication Year 2016
Title Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding whooping cranes (<i>Grus americana</i>)
DOI 10.1016/j.ygcen.2016.04.009
Authors Megan E Brown, Sarah J. Converse, Jane N. Chandler, Charles Shafer, Janine L Brown, Carol L Keefer, Nucharin Songsasen
Publication Type Article
Publication Subtype Journal Article
Series Title General and Comparative Endocrinology
Series Number
Index ID 70170760
Record Source USGS Publications Warehouse
USGS Organization Patuxent Wildlife Research Center

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