Macroinvertebrados aquáticos associados às raízes de Eichhornia azuera (Swarts) Kunth (Pontederiaceae) em uma lagoa marginal no Pantanal, MS

Abstract

Resumoacró tas aquáticas desempenham um importante papel na estruturação de comunidades dos ecossistemas de aquáticos. No presente estudo, a abundância e a riqueza da comunidade de macroinvertebrados foram comparadas através de correlação simples e da participação relativa média com o volume de raízes de Eichhornia azurea numa lagoa marginal no Pantanal ( S) no período de seca. s macroinvertebrados foram identi cados até o menor nível taxonômico possível e os volumes das raízes obtidos pelo método de deslocamento de volume. Foram identi cados 21 táxons pertencentes a 13 famílias num total de 3 1 exemplares. Chironomus sp. (Chironomidae), Slavina sp. e Dero sp. (Naididae), todos detritívoros, foram mais representativos. Houve correlação positiva entre o volume das raízes com a abundância e riqueza de macroinvertebrados. Embora a análise de variância não tenha mostrado diferenças signi cativas entre riqueza e abundância da macrofauna e o volume das raízes, observou-se uma tendência de aumento de ambas as variáveis com o aumento do volume das raízes. Assim, as raízes maiores devem ter maior disponibilidade de microhabitats usti cando a tendência observada. Os resultados obtidos indicaram que as dimensões das raízes E. azurea podem desempenhar importante papel ecológico como abrigo e local de acúmulo de alimentos para os macroinvertebrados em lagoas. Palavras-chave: Fitofauna; Lagoa; Nicho; Zona litoral AbstractAquatic macroinvertebrates associated with roots of Eichhornia azuera (Swarts) Kunth (Pontederiaceae) in an oxbow lake in Pantanal, MS. Macrophytes play an important role in the community structure of aquatic systems. In this study, we examined the macroinvertebrate communities within 20 Eichhornia azurea roots in an oxbow lake in Pantanal (MS) during dry season. Species abundance and richness were compared via linear regression, and the mean relative proportion of macroinvertebrates among root samples was determined. Macroinvertebrates were identi ed to the lowest practical taxonomic level, and root volume was measured using the volume displacement method. We identi ed 3 1 specimens, belonging to 31 families and 21 taxonomic groups. Chironomus sp.

Characterization of the Biotic (Macrophytes and Macroinvertebrates) and Abiotic Factors of Pantanal Ponds in the Miranda River Floodplain

“…This species of macrophyte presents a larger surface area in contact with water, giving greater area for colonization by invertebrates. Besides, data from the literature indicate that the dimensions of E. azurea roots may play an important ecological role as a shelter and place of food accumulation for invertebrates in ponds (Saulino & Trivinho-Strixino 2014). This fact explains the dominance of Chironomidae and Oligochaeta in ponds under the dominance of E. azurea, S. auriculata and P. stratiotes.…”

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

“…Particularly in this system, hydrological variation throughout the year directly interferes with the availability and variety of food items, which consequently leads to changes in the fish diet (Ferreira et al, 2014;Scanferla & Súarez, 2016). The aquatic macrophytes that colonize this floodplain also play an important role in the complexity and heterogeneity of environments (Thomaz & Cunha, 2010;Dias et al, 2017b), providing shelter for insects, mollusks, periphyton, and fish (Silva et al, 2009;Saulino & Trivinho-Strixino, 2014), influencing the food chain (Grzybkowska et al, 2018).…”

Temporal variability of the macroinvertebrate community associated with Eichhornia azurea (Swarts) Kunth (Pontederiaceae) in a lake marginal to a tropical river

“…When adult, E. azurea can be divided into a sedimentfixed/rooted part (basal zone) and a floating part (apical zone) (Melo et al, 2004). Their roots are adventitious, hairtype, made up of various fine ramifications that develop into the nodes of each rhizome (Saulino and Trivinho-Strixino, 2014), in different lengths and biomasses according to the plant development stage (Padial et al, 2009). Variability of E. azurea stand biomass depends on environmental conditions, such as depth, turbidity, nutrient contents, temperature, and water level (Camargo and Esteves, 1996;Thomaz and Santos, 2000;Milne et al, 2006).…”