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The adrenocortical response of greater sage grouse (Centrocercus urophasianus) to capture, ACTH injection, and confinement, as measured in fecal samples

Physiological and Biochemical Zoology

By:
, , , , and
DOI: 10.1086/596513

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Abstract

Investigators of wildlife populations often utilize demographic indicators to understand the relationship between habitat characteristics and population viability. Assessments of corticosterone may enable earlier detection of populations at risk of decline because physiological adjustments to habitat disturbance occur before reproductive diminutions. Noninvasive methods to accomplish these assesments are important in species of concern, such as the greater sage grouse (GRSG). Therefore, we validated a radioimmunoassay that measures immunoreactive corticosterone metabolites (ICM) in fecal samples and used it to characterize the adrenocortical response of 15 GRSG exposed to capture, intravenous injection of 50 IU/kg adrenocorticotrophic hormone (ACTH) or saline, and 22 h of confinement. Those animals injected with ACTH exhibited a more sustained (P = 0.0139) and less variable (P = 0.0012) response than those injected with saline, indicating different levels of adrenocortical activity. We also found that potential field-collection protocols of fecal samples did not alter ICM concentrations: samples held at 4??C for up to 16 h contained similar levels of ICM as those frozen (-20??C) immediately. This study demonstrates a multiphasic adrenocortical response that varied with the level of stimulation and indicates that the assay used to measure this phenomenon is applicable for studies of wild GRSG. ?? 2009 by The University of Chicago. All rights reserved.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The adrenocortical response of greater sage grouse (Centrocercus urophasianus) to capture, ACTH injection, and confinement, as measured in fecal samples
Series title:
Physiological and Biochemical Zoology
DOI:
10.1086/596513
Volume
82
Issue:
2
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Physiological and Biochemical Zoology
First page:
190
Last page:
201
Country:
United States
State:
Oregon
Other Geospatial:
Hart Mountain National Antelope Refuge
Online Only (Y/N):
N
Additional Online Files(Y/N):
N