Dealing with the Clandestine Nature of Wildlife-Trade Market Surveys. SHANNON M. BARBER-MEYER. 2010; Conservation Biology - Wiley InterScience

Dealing with the Clandestine Nature of Wildlife-Trade Market Surveys. SHANNON M. BARBER-MEYER. 2010; Conservation Biology - Wiley InterScience: "Illegal international trade in wildlife (excluding fisheries and timber) has been valued at more than US$20 billion. A more precise figure has not been determined in part because of the clandestine nature of the trade, and for this same reason even regional and local levels of wildlife trade are difficult to assess. The application of recent developments in wildlife field-survey methods (e.g., occupancy) now allows for a more-accurate estimation of wildlife trade occurrence, including its hidden components at a variety of scales (e.g., regional, local) and periods (e.g., single season, 1 year, multiple years)."