Monitoring Butterfly Abundance: Beyond Pollard Walks

  title={Monitoring Butterfly Abundance: Beyond Pollard Walks},
  author={J{\'e}r{\^o}me Pellet and Jason T. Bried and David Parietti and Antoine Gander and Patrick O. Heer and Daniel Cherix and Rapha{\"e}l Arlettaz},
  booktitle={PloS one},
Most butterfly monitoring protocols rely on counts along transects (Pollard walks) to generate species abundance indices and track population trends. It is still too often ignored that a population count results from two processes: the biological process (true abundance) and the statistical process (our ability to properly quantify abundance). Because individual detectability tends to vary in space (e.g., among sites) and time (e.g., among years), it remains unclear whether index counts truly… CONTINUE READING
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