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Butterfly population counts using transect surveys may be unreliable due to varying individual detectability. Monitoring programs should include detectability measures for accurate abundance and trend assessments.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Entomology

Background:

  • Butterfly monitoring often uses transect counts (Pollard walks) to estimate species abundance and population trends.
  • The accuracy of these counts is influenced by both true population size and the statistical ability to quantify it.
  • Individual butterfly detectability can vary significantly across space and time, potentially compromising the reliability of index counts.

Purpose of the Study:

  • To compare the accuracy of capture-mark-recapture (absolute abundance) and count-index (relative abundance) methods for monitoring butterfly populations.
  • To investigate the impact of intraspecific variability in detectability on the reliability of standard monitoring techniques.
  • To assess how species ecology, behavior, and habitat type influence the accuracy of count-based abundance estimates.

Main Methods:

  • Conducted a comparative study using capture-mark-recapture and count-index methods.
  • Monitored three butterfly species: Maculinea nausithous, Iolana iolas (Lycaenidae), and Minois dryas (Satyridae).
  • Surveyed populations across diverse habitat types to account for environmental variations.

Main Results:

  • Demonstrated that intraspecific variability in individual detectability is common under standard monitoring conditions.
  • Found that the reliability of count-based indices for estimating population abundance is questionable.
  • Highlighted that the accuracy of count-based methods is significantly influenced by species-specific traits and habitat characteristics.

Conclusions:

  • Standard count-based butterfly monitoring methods may not accurately reflect true population sizes and trends due to variable detectability.
  • Incorporating detectability measures into monitoring programs is crucial for reliable abundance and trend assessments.
  • The choice of monitoring method and analytical approach should be tailored to the specific butterfly species, its behavior, and the surveyed habitat.