How Habitat Filtering Can Affect Taxonomic and Functional Composition of Aquatic Insect Communities in Small Amazonian S
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ECOLOGY, BEHAVIOR AND BIONOMICS
How Habitat Filtering Can Affect Taxonomic and Functional Composition of Aquatic Insect Communities in Small Amazonian Streams G NICACIO1 , EJ CUNHA1 , N HAMADA2 , L JUEN1,3 1
Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Univ Federal do Pará, Belém, Pará, Brasil Programa de Pós-graduação em Entomologia, Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia – INPA, Manaus, AM, Brasil 3 Instituto de Ciências Biológicas, Univ Federal do Pará, Belém, PA, Brasil 2
Keywords Benthic macroinvertebrates, biological traits, habitat templet, environmental filtering, Amazon Correspondence G Nicacio, Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Univ Federal do Pará, Rua Augusto Correia, Bairro Guamá, Belém, Pará, Brasil; [email protected] Edited by Yulin Gao – CAAS, China Received 4 July 2019 and accepted 28 April 2020 * Sociedade Entomológica do Brasil 2020
Abstract Responses in taxonomic and functional composition of communities were analysed in small Amazonian streams at the small and large scale (habitat patches, river segment scale, and catchment scale). We hypothesised that similar responses in community structure to local environmental factors were a correlation between taxonomic and functional composition. To evaluate the response of taxonomic composition to environmental variables, redundancy analysis (RDA) and RLQ analysis were performed to investigate the response of community abundance (L) as a function of the environment (R) and traits (Q). The fourth-corner analysis was applied to summarize specific interactions between environmental variables and traits. Then, community taxonomic composition was associated with models at multiple scales of habitat (i.e. riparian/channel, substrates, and water variables). Likewise, the fourth-corner tests and RLQ axes showed associations between trait composition and environmental variables related to variables, such as riparian cover and channel morphology followed by variation in substrate size and composition. Unexpectedly, these results did not show specific associations between unique environmental variables and traits. At last, results showed that local conditions of stream habitat regulated community structure and functional composition of aquatic insects. Thus, these findings indicate that the local environmental filtering appears to be strongly associated with selected species traits adapted to occur in a range of habitat conditions. Despite the low number of analysed streams, these results provide important information for understanding the simultaneous variation in functional trait composition and community composition of aquatic insect assemblages.
Introduction How stream habitats support different species compositions and how species coexist within and among communities are recurring issues in riverine ecology (Vinson & Hawkins 1998). To address these questions, niche-based approaches have extensively been applied to explain and predict species
distributions based on spatiote
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