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<p>Birds are key indicators of environmental health, providing critical insight into habitat quality through changes in abundance and community structure. This study examined avian assemblages in two wetlands within the Lake Tana sub-basin: Yiganda, a relatively undisturbed site, and Chimba, which is subject to significant anthropogenic disturbance. Using a systematic random sampling approach, we conducted bird counts during both dry and wet seasons. A total of 6,432 individuals representing 95 species were recorded across both wetlands. Seasonal shifts in bird abundance differed between sites: Yiganda showed a smaller decline in abundance and diversity from the dry to wet season, suggesting greater ecological stability. In contrast, Chimba exhibited more pronounced seasonal fluctuations. Notably, significant differences in bird diversity were found between the two wetlands during the wet season, but not during the dry season. These findings underscore the importance of conserving minimally disturbed wetlands and highlight the potential for restoring degraded habitats such as Chimba to enhance regional avian biodiversity.</p>

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Disturbed vs non-disturbed wetlands: a case of bird assemblages around Lake Tana in East Africa

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月3日

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  • Amare Gibru,
  • Michał Polakowski,
  • Łukasz Jankowiak

摘要

Birds are key indicators of environmental health, providing critical insight into habitat quality through changes in abundance and community structure. This study examined avian assemblages in two wetlands within the Lake Tana sub-basin: Yiganda, a relatively undisturbed site, and Chimba, which is subject to significant anthropogenic disturbance. Using a systematic random sampling approach, we conducted bird counts during both dry and wet seasons. A total of 6,432 individuals representing 95 species were recorded across both wetlands. Seasonal shifts in bird abundance differed between sites: Yiganda showed a smaller decline in abundance and diversity from the dry to wet season, suggesting greater ecological stability. In contrast, Chimba exhibited more pronounced seasonal fluctuations. Notably, significant differences in bird diversity were found between the two wetlands during the wet season, but not during the dry season. These findings underscore the importance of conserving minimally disturbed wetlands and highlight the potential for restoring degraded habitats such as Chimba to enhance regional avian biodiversity.