Acta Limnologica Brasiliensia
http://www.alb.periodikos.com.br/article/doi/10.1590/S2179-975X3219
Acta Limnologica Brasiliensia
Original Article

Alpha and beta diversities of Trichoptera (Insecta) assemblages in natural and rural subtropical streams

Diversidade alfa e beta de assembleias de Trichoptera (Insecta) em riachos subtropicais naturais e rurais

Mayara Breda; Rozane Maria Restello; Ricardo Giovenardi; Alex Pinheiro Vizzotto; Briseidy Soares; Luiz Ubiratan Hepp

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Abstract

Abstract:: Aim: The aim of this study was to determine the diversity of Trichoptera in subtropical streams and the effects of environmental variables and geographical position on alpha and beta diversity in natural and rural streams.

Methods: We collected Trichoptera with a Surber sampler in 12 small order subtropical streams (six streams with apparent absence of anthropic disturbance and six streams with rural activity in their drainage areas) and measured limnological variables. We evaluated the effects of environmental variability and geographical distance on the dissimilarity of the assemblage and calculated the contribution of alpha and beta diversity for each stream.

Results: We collected a total of 1,264 Trichoptera larvae distributed in 17 genera and 11 families. The genera Phylloicus and Smicridea were found in almost all streams. We observed a positive effect of environmental variability on biological variability but not of geographical distance. The environmental variability was basically generated by the influence of higher concentrations of dissolved organic carbon and nutrients. We observed the greatest contribution of the alpha diversity of the Trichoptera assemblages in natural streams and of beta diversity in the rural streams.

Conclusions: Our results demonstrate that the variability of Trichoptera is affected by environmental characteristics, but not by geographical position.

Keywords

dissimilarity, taxonomic richness, ecological integrity, riparian vegetation, agricultural impact

Resumo

Resumo:: Objetivo: O objetivo desse estudo foi determinar a diversidade de Trichoptera em riachos e o efeito das variáveis ambientais e posição geográfica na diversidade alfa e beta em riachos naturais e rurais.

Métodos: Coletamos larvas de Trichoptera com um amostrador Surber em 12 riachos subtropicais de pequena ordem (seis riachos com ausência aparente de distúrbios antrópicos e seis riachos com atividades rurais na área de drenagem) e quantificamos as variáveis limnológicas. Avaliamos os efeitos da variabilidade ambiental na dissimilaridade das assembleias e calculamos a contribuição da diversidade alfa e beta nos riachos.

Resultados: Coletamos um total de 1264 larvas de Trichoptera distribuidas em 17 gêneros e 11 famílias. Os gêneros Phylloicus e Smicridea foram encontramos em praticamente todos os riachos. Observamos um efeito positivo da variabilidade ambiental na variabilidade biológica, mas não da posição geográfica. A variabilidade ambiental foi gerada basicamente pela influência de maiores concentrações de carbono orgânico dissolvido e nutrientes. Observamos maior contribuição da diversidade alfa nas assembleias de Trichoptera nos riachos naturais, e da diversidade beta nos riachos rurais.

Conclusões: Nossos resultados demonstram que a variabilidade de Trichoptera é afetada por características ambientais, e não pela posição geográfica.
 

Palavras-chave

dissimilaridade, riqueza taxonômica, integridade ecológica, vegetação ripária, impacto agrícola

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Submitted date:
03/21/2019

Accepted date:
05/21/2020

Publication date:
08/03/2020

5f285f870e882599140e4939 alb Articles
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