Evaluation of the fecal steroid concentrations in Alouatta belzebul (Primates, Atelidae) in the National Forest of Tapirape-Aquiri in Pará, Brazil

J Med Primatol. 2013 Dec;42(6):325-32. doi: 10.1111/jmp.12061. Epub 2013 Aug 2.

Abstract

Background: The studies on fecal steroid metabolites published with free-living primates are limited mainly by the difficulty in obtaining samples.

Methods: A radioimmunoassay was used to measure the fecal steroid concentrations in Alouatta belzebul in the National Forest of Tapirape-Aquiri in Brazil.

Results and conclusions: Androgens were significantly higher for the adult males from the Area of Influence (AI-I group) when compared to those from the Control Area (CA group) (P < 0.05). Progestin and estrogen concentrations were higher in the females from the CA group than in those from the AI-I for both the adult females and females with offspring; however, P < 0.05 was only observed in the concentrations of fecal progestins from the adult females. The physiological differences between the AI-I and CA groups suggest that the cause was a sum of factors, such as an exposure to sound waves, feeding habits, daily activity patterns, and the habituation of the animals.

Keywords: howler monkey; radioimmunoassay; scan sampling method.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenal Cortex Hormones / analysis*
  • Alouatta*
  • Animals
  • Brazil
  • Feces / chemistry*
  • Female
  • Gonadal Steroid Hormones / analysis*
  • Male
  • Reference Values

Substances

  • Adrenal Cortex Hormones
  • Gonadal Steroid Hormones