Experimental assessment of the effects of environmental factors and longitudinal position on alpha and beta diversities of aquatic insects in a neotropical stream
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Data
2012-04-26
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Resumo
We evaluated the effect of environmental factors on the abundance and genera richness of aquatic
insects colonizing artificial substrates. We also assessed the relative effects of environmental factors on
assemblage variation (beta diversity), and contrasted its magnitude with the variation associated with
the spatial position of reaches in a Neotropical stream. Homogeneous and heterogeneous bricks were
installed in seven stream reaches and removed after 60d. Substrate type and organic matter showed
significant effects on abundance. For observed richness, substrate type was the only important variable.
For rarefied richness, no explanatory variable was important. A NMDS ordination of bricks revealed
the effect of spatial position and substrate type. A partial Redundancy Analysis (pRDA) indicated that
the environmental matrix explained 12.44% of the total variation, while reach position explained 7.41%.
We conclude that at local scale (reaches 430–920 m apart), environmental factors, especially substrate
heterogeneity, were important in determining the alpha and beta diversities of the insect assemblage in
the stream.
Descrição
v. 97,n. 2, p. 157-167, mai., 2012.
Palavras-chave
Substrate heterogeneity, Partial redundancy analysis, Ephemeroptera, Plecoptera, Trichoptera
Citação
HEPP, Luiz U.; LANDEIRO, Victor L.; MELO, Adriano S. Experimental assessment of the effects of environmental factors and longitudinal position on alpha and beta diversities of aquatic insects in a neotropical stream. International Review of Hydrobiology, v. 97,n. 2, p. 157-167, May 2012. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/iroh.201111405/epdf>.