Article
A Simplified Method for Monitoring Progestagens in African Elephants under Field Conditions
Methods in Ecology and Evolution
(2010)
Abstract
Summary
1. Hormone analyses are frequently used to support management of wildlife; however, current techniques are not very field-friendly. In situ hormone monitoring is often expensive, time consuming and logistically difficult. Thus, a new method for assessing ovarian cycle activity non-invasively in free-ranging African elephants was developed. 2. The technique involves handshaking faecal samples in common organic solvents, use of environmentally stable antibody-coated microtitre plates and assessment of progestagen concentrations based on a visual colour change.
3. Studies using ex situ African elephants determined that handshaking faeces in a solution of isopropyl alcohol was effective for extracting the faecal progestagens (efficiency >90%).
4. Antibody-coated plates were stable for up to 3 months under a range of temperatures (4 to >38 C) and the resulting faecal oestrous cycle progestagen profiles corresponded significantly to those of serum (r = 0Æ89, P < 0Æ01).
5. This field-friendly technique provided qualitative hormone data without the need for expensive equipment. Although developed for progestagen analyses in elephants, this approach should be adaptable to other steroids in a myriad of species. As such, it could facilitate how hormones are measured in species under field conditions and provide new tools for making sensible conservation management decisions.
Keywords
- enzyme immunoassay,
- faeces,
- hormone extraction,
- Loxodonta africana,
- noninvasive,
- progestagens
Disciplines
Publication Date
2010
DOI
doi: 10.1111/j.2041-210X.2009.00004.x
Publisher Statement
Originally published in Methods in Ecology and Evolution
http://onlinelibrary.wiley.com/doi/10.1111/j.2041-210X.2009.00004.x/full?wol1URL=/doi/10.1111/j.2041-210X.2009.00004.x/full®ionCode=US-KY&identityKey=2c18d302-413c-4840-ab48-3e742b676160
Citation Information
Freeman EW, Abbondanza FN, Meyer JM, Schulte BA, Brown JL. 2010. A simplified method for monitoring progestagens in African elephants under field conditions. Methods in Ecology and Evolution 1, 86-91.