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<p>Dragonflies, including both true dragonflies (<i>Anisoptera</i>) and damselflies (<i>Zygoptera</i>), are sensitive bioindicators of wetland ecosystem health, and thus a useful taxon for monitoring these threatened habitats. Extensive monitoring programs are essential to assess current and future wetland conditions and to implement effective conservation strategies. Dragonflies respond to changes in wetland environmental conditions and habitat integrity by changes in their abundance and diversity. Therefore it is of vital importance to apply standard monitoring methods which guarantee, as far as possible, reliable data on abundances and diversity. However, the extent to which community assemblages of Odonata change throughout the day is still poorly understood. We examined the temporal trends in the abundance and species richness of adult dragonflies across five ponds in the northwestern part of the region Lombardy, Italy. We also compared the abundance trends of the four most common species throughout the day. Our findings showed that between 13:00 and 17:00 the highest abundance and species richness was observed, while surveys conducted outside this time frame resulted in significantly lower values. To ensure data comparability, sampling methods must be standardized in both space and time and optimized to maximize species detectability.</p>

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What is the best time of the day to monitor Odonata? An investigation into changes in the abundance and species richness of dragonflies in ponds in northern Italy

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Marco Cazzola,
  • Leonardo Viliani,
  • Sönke Hardersen

摘要

Dragonflies, including both true dragonflies (Anisoptera) and damselflies (Zygoptera), are sensitive bioindicators of wetland ecosystem health, and thus a useful taxon for monitoring these threatened habitats. Extensive monitoring programs are essential to assess current and future wetland conditions and to implement effective conservation strategies. Dragonflies respond to changes in wetland environmental conditions and habitat integrity by changes in their abundance and diversity. Therefore it is of vital importance to apply standard monitoring methods which guarantee, as far as possible, reliable data on abundances and diversity. However, the extent to which community assemblages of Odonata change throughout the day is still poorly understood. We examined the temporal trends in the abundance and species richness of adult dragonflies across five ponds in the northwestern part of the region Lombardy, Italy. We also compared the abundance trends of the four most common species throughout the day. Our findings showed that between 13:00 and 17:00 the highest abundance and species richness was observed, while surveys conducted outside this time frame resulted in significantly lower values. To ensure data comparability, sampling methods must be standardized in both space and time and optimized to maximize species detectability.