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Environmental variables affect the diversity of adult damselflies (Odonata: Zygoptera) in western Amazonia

  • Written by Joás Brito, Lenize Calvão, Erlane Cunha, Leandro Maioli, Mayla Barbirato, Samir Rolim, Leandro Juen
  • International Journal of Odonatology
  • volume: 24 (2021)
  • PDF
  • 108–121 pp.
  • Release date: 2021-07-07
  • doi: 10.23797/2159-6719_24_8

Keywords: dragonfly, aquatic insects, connectivity, stream ecology, habitat integrity

Article (Brito et al.)

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International Journal of Odonatology 24 (2021)

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Our study evaluated the effects of environmental variables on the assemblages of the suborder Zygoptera, and tested the hypothesis that environmental variables are more important determinants of the structure of these assemblages than limnological variables in streams. We sampled 17 streams in the Carajás National Forest and tested our hypothesis using a linear regression analysis, with the zygopteran species composition, richness, and abundance as the response variables. Our findings indicate that both limnological and physical variables influence, independently, the characteristics of the zygopteran assemblages. The riparian forest maintains the stability of the environment and provides dispersal corridors, along which the zygopterans can reach alternative, suitable environments. The small scale of this study also implies that the continuity of the vegetation is essential for the dispersal of the zygopterans among different landscapes. The high levels of abundance recorded in the better-preserved environments may reflect the maintenance of specific habitats and resource availability. Riparian forest is crucial to the ecological equilibrium of the stream systems, although further research at a broader spatial scale that focuses on a greater diversity of variables should provide more robust insights into the phenomenon.

Joás Brito

Graduate Program in Ecology, Federal University of Pará, Belém, Brazil

jotabio13@gmail.com

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Lenize Calvão

Laboratory of Ecology and Conservation, Federal University of Pará, Belém, Brazil

ORCID: 0000-0003-3428-8754

lenizecalvao@gmail.com

 

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Erlane Cunha

Laboratory of Ecology and Conservation, Federal University of Pará, Belém, Brazil

erlanejcunha@gmail.com

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Leandro Maioli

Vale S.A., North and South Sierras Environmental Management

leandro.maioli@vale.com

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Mayla Barbirato

Vale S.A., North and South Sierras Environmental Management

mayla.barbirato@vale.com

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Samir Rolim

Project Coordination, Amplo Engineering and Project Management Ltd.

sgrolim@gmail.com

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Leandro Juen

Laboratory of Ecology and Conservation, Federal University of Pará, Belém, Brazil

leandrojuen@gmail.com

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