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Researchers identified key volatile compounds in female coyote urine, with concentrations peaking during estrus. These compounds may play a role in coyote pheromonal communication.

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Area of Science:

  • Animal Behavior
  • Chemical Ecology
  • Mammalian Physiology

Background:

  • Urine composition in canids can provide insights into reproductive status.
  • Volatile organic compounds (VOCs) are crucial in animal communication, including pheromonal signaling.

Purpose of the Study:

  • To identify and quantify volatile compounds in female coyote urine.
  • To investigate temporal variations in these compounds, particularly in relation to the estrus cycle.

Main Methods:

  • Urine samples collected over two years during winter and spring.
  • Headspace analysis using Tenax GC trapping and Gas Chromatography-Mass Spectrometry (GC-MS).
  • Rapid sample processing (<1 hour) and mild conditions to preserve volatile compounds.

Main Results:

  • Identified 34 volatile compounds, including sulfur compounds, aldehydes, ketones, and hydrocarbons.
  • Methyl 3-methylbut-3-enyl sulfide was the principal constituent (>50% of total volatiles).
  • Concentrations of five compounds exhibited quasi-periodic variations with maxima during peak estrus.

Conclusions:

  • Several volatile compounds in female coyote urine show cyclical changes linked to estrus.
  • These compounds, including methyl 3-methylbut-3-enyl sulfide, may function as pheromones in coyote social and reproductive interactions.