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<p>In the tropics, where seasonality is primarily governed by rainfall patterns, transitions between the dry (summer) and wet (winter) seasons play a central role in regulating ecological processes and species interactions. This study investigated how these seasonal transitions influence Zygoptera (Odonata) assemblages in streams of the Adolpho Ducke Forest Reserve. Using standardized sampling methods, we compared assemblages between the winter (June 2023) and summer (March 2024) seasons. A total of 295 individuals were collected, representing 20 species across 12 genera. Species richness showed little variation between summer (12 species) and winter (13 species); however, notable differences in species composition were observed between seasons. We recorded four generalist species occurring throughout the year and five seasonal specialists, two associated with summer and three with winter. These results indicate that Amazonian seasonality promotes the reorganization of aquatic assemblages through species-specific responses to seasonal climatic variation, rather than through changes in overall species richness. Our findings emphasize the importance of incorporating seasonal dynamics into biodiversity assessments of tropical freshwater ecosystems and underscore the critical role of protected forest areas in understanding and conserving biodiversity baselines, which remain largely underexplored in tropical regions.</p>

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Seasonal variation of Zygoptera (Odonata) assemblages in preserved streams of Central Amazonia

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Myckey Gonçalves,
  • Neusa Hamada,
  • Everton Cruz da Silva,
  • Leandro Juen,
  • Leandro Schlemmer Brasil

摘要

In the tropics, where seasonality is primarily governed by rainfall patterns, transitions between the dry (summer) and wet (winter) seasons play a central role in regulating ecological processes and species interactions. This study investigated how these seasonal transitions influence Zygoptera (Odonata) assemblages in streams of the Adolpho Ducke Forest Reserve. Using standardized sampling methods, we compared assemblages between the winter (June 2023) and summer (March 2024) seasons. A total of 295 individuals were collected, representing 20 species across 12 genera. Species richness showed little variation between summer (12 species) and winter (13 species); however, notable differences in species composition were observed between seasons. We recorded four generalist species occurring throughout the year and five seasonal specialists, two associated with summer and three with winter. These results indicate that Amazonian seasonality promotes the reorganization of aquatic assemblages through species-specific responses to seasonal climatic variation, rather than through changes in overall species richness. Our findings emphasize the importance of incorporating seasonal dynamics into biodiversity assessments of tropical freshwater ecosystems and underscore the critical role of protected forest areas in understanding and conserving biodiversity baselines, which remain largely underexplored in tropical regions.