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The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams.

Salvarrey AV, Kotzian CB, Spies MR, Braun B - J. Insect Sci. (2014)

Bottom Line: A total of 42 families and 129 taxa were found, with predominance of environmentally tolerant taxa.However, changes in anthropic variables were not affected by these geological differences and therefore did not correlate with patterns of spatial distribution in macroinvertebrate communities.Richness as a whole tended to be higher in 3(rd) to 4(th) order set of segments, but this trend was a result of local anthropic environmental disturbances.

View Article: PubMed Central - PubMed

Affiliation: Programa de Pós-Graduação em Biodiversidade Animal, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria. Faixa de Camobi km 9, 97105-900, Santa Maria, RS, Brazil modrizralok@hotmail.com.

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Ordination diagram non-metric multidimensional scaling of the river segments sampled (Vacacaí-Mirim, Ibicuí-Mirim, and Tororaipí) of 1st, 2nd, 3rd, and 4th orders and B) of the microbasins sampled (VMR = Vacacaí-Mirim, IMR = Ibicuí-Mirim, and TRR = Tororaipí), in August 2008 (VMR) and August 2009 (IMR, TRR), Rio Grande do Sul, Brazil. High quality figures are available online.
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f03_01: Ordination diagram non-metric multidimensional scaling of the river segments sampled (Vacacaí-Mirim, Ibicuí-Mirim, and Tororaipí) of 1st, 2nd, 3rd, and 4th orders and B) of the microbasins sampled (VMR = Vacacaí-Mirim, IMR = Ibicuí-Mirim, and TRR = Tororaipí), in August 2008 (VMR) and August 2009 (IMR, TRR), Rio Grande do Sul, Brazil. High quality figures are available online.

Mentions: The non-metric multidimensional scaling ordination depicted the same result as the rarefaction method, confirming a trend toward segregation among macroinvertebrate communities of the low orders from the higher ones (Figure 3). The ANOSIM test presented no significant result for both approaches (microbasins: R = 0, p = 0.42; order: R = 0.295, p = 0.14).


The influence of natural and anthropic environmental variables on the structure and spatial distribution along longitudinal gradient of macroinvertebrate communities in southern Brazilian streams.

Salvarrey AV, Kotzian CB, Spies MR, Braun B - J. Insect Sci. (2014)

Ordination diagram non-metric multidimensional scaling of the river segments sampled (Vacacaí-Mirim, Ibicuí-Mirim, and Tororaipí) of 1st, 2nd, 3rd, and 4th orders and B) of the microbasins sampled (VMR = Vacacaí-Mirim, IMR = Ibicuí-Mirim, and TRR = Tororaipí), in August 2008 (VMR) and August 2009 (IMR, TRR), Rio Grande do Sul, Brazil. High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4199531&req=5

f03_01: Ordination diagram non-metric multidimensional scaling of the river segments sampled (Vacacaí-Mirim, Ibicuí-Mirim, and Tororaipí) of 1st, 2nd, 3rd, and 4th orders and B) of the microbasins sampled (VMR = Vacacaí-Mirim, IMR = Ibicuí-Mirim, and TRR = Tororaipí), in August 2008 (VMR) and August 2009 (IMR, TRR), Rio Grande do Sul, Brazil. High quality figures are available online.
Mentions: The non-metric multidimensional scaling ordination depicted the same result as the rarefaction method, confirming a trend toward segregation among macroinvertebrate communities of the low orders from the higher ones (Figure 3). The ANOSIM test presented no significant result for both approaches (microbasins: R = 0, p = 0.42; order: R = 0.295, p = 0.14).

Bottom Line: A total of 42 families and 129 taxa were found, with predominance of environmentally tolerant taxa.However, changes in anthropic variables were not affected by these geological differences and therefore did not correlate with patterns of spatial distribution in macroinvertebrate communities.Richness as a whole tended to be higher in 3(rd) to 4(th) order set of segments, but this trend was a result of local anthropic environmental disturbances.

View Article: PubMed Central - PubMed

Affiliation: Programa de Pós-Graduação em Biodiversidade Animal, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria. Faixa de Camobi km 9, 97105-900, Santa Maria, RS, Brazil modrizralok@hotmail.com.

Show MeSH
Related in: MedlinePlus