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The relationship between instream habitat characteristics, emergent insects, and riparian bird communities.

机译：河内栖息地特征，昆虫出没和河岸鸟类群落之间的关系。

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摘要

Streams and riparian areas can be intricately connected via physical and biotic interactions that influence habitat conditions and supply resource subsidies between these ecosystems. Streambed characteristics such as the size of substrate particles influence the composition and the abundance of emergent aquatic insects, which can be an important resource for riparian breeding birds. We predict fine sediment abundance in small headwater streams directly affects the composition and number of emergent insects while it may indirectly affect riparian bird assemblages. Streams with abundant fine sediments that embed larger substrates should have lower emergence of large insects such as Ephemeroptera, Plecoptera and Trichoptera. Streams with lower emergent insect abundance are predicted to support fewer breeding birds and may lack certain bird species that specialize on aquatic insects. This study examined relationships between streambed characteristics, and emergent insects (composition, abundance and biomass), and riparian breeding birds (abundance and richness) along headwater streams of the Otter River Watershed. The stream bed habitats of seven stream reaches were characterized using longitudinal surveys. Malaise traps were deployed to sample emergent aquatic insects. Riparian breeding birds were surveyed using fixed-radius point-counts. Streams differed within a wide range of fine sediment abundances. Total emergent aquatic insect abundance increased as coverage by instream substrates increased in diameter, while bird community was unresponsive to insect or stream features. Knowledge of stream and riparian relationships is important for understanding of food webs in these ecosystems, and it is useful for riparian forest conservation and improving land-use management to reduce sediment pollution in these systems.
机译：溪流和河岸地区可以通过物理和生物相互作用而错综复杂地相互联系，这会影响栖息地条件并为这些生态系统之间提供资源补贴。河床特征（例如底物颗粒的大小）会影响水生昆虫的组成和数量，这可能是河岸繁殖鸟类的重要资源。我们预测细小的源头河水中的细沙含量会直接影响出苗昆虫的组成和数量，而可能会间接影响河岸鸟类的聚集。内含较大基质的细小沉积物流应较少出现大型昆虫，如E翅目，鞘翅目和毛鳞翅目。预计出苗率较低的溪流将支持较少的繁殖鸟类，并且可能缺少某些专门从事水生昆虫的鸟类。这项研究检查了沿奥特河流域上游源头的河床特征与新兴昆虫（组成，丰度和生物量）与河岸繁殖鸟类（丰度和丰富度）之间的关系。使用纵向调查对七个河段的河床生境进行了描述。恶意诱捕器被部署用于对紧急水生昆虫进行采样。使用固定半径点数对河岸种鸟进行了调查。溪流在很大范围的细沙中差异很大。随着河床底物的覆盖直径的增加，总的涌现水生昆虫的丰度增加，而鸟类群落对昆虫或河流特征没有反应。对河流和河岸关系的了解对于理解这些生态系统中的食物网非常重要，对于河岸森林保护和改善土地利用管理以减少这些系统中的沉积物污染非常有用。

著录项

  • 作者

    Forgette, Kyle D.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Biology Entomology.;Biology Limnology.
  • 学位 M.S.
  • 年度 2011
  • 页码 63 p.
  • 总页数 63
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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