Longitudinal macroinvertebrate organization over contrasting discontinuities: effects of a dam and a tributary

Katano, Izumi; Negishi, Junjiro N.; Minagawa, Tomoko; Doi, Hideyuki; Kawaguchi, Yôichi; Kayaba, Yuichi

doi:10.1899/08-010.1

Cited by 64 publications

(44 citation statements)

References 44 publications

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“…De acordo com o conceito de descontinuidade seriada (waRd & stanfoRd, 1983), as ações antrópicas como represas, poluição e erosão, agem como agentes de distúrbio, podendo causar descontinuidades dentro do continuum de um rio em pequenas escalas, o que pode levar à adição ou substituição de espécies, e/ou mudanças relativas de abundância (stanfoRd & waRd, 2001;aRaújo et al, 2009;Katano et al, 2009).…”

Section: Discussionunclassified

Distribuição espacial das guildas tróficas e estruturação da comunidade de Ephemeroptera (Insecta) em córregos do Cerrado de Mato Grosso, Brasil

Shimano

Salles

Faria

et al. 2012

Iheringia, Sér. Zool.

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ABSTRACT. Spatial distribution of trophic guilds and community structure of Ephemeroptera (Insecta) in streams of the Cerrado region in Mato Grosso, Brazil. We analyzed the structure of the functional feeding groups of Ephemeroptera in five different types of substrates (litter in riffles, backwater litter, wood, stones and roots) from first to fifth orders at the Pindaíba River basin, state of Mato Grosso, Brazil. We also studied the specificity and frequency of the organism, and if the functional approach reflects changes within the community through ordination analysis. Our results assemble information about the functional classification of mayfly nymphs and show that scrapers were the most abundant, and gathering -collectors are the more diverse. Third order streams were the most richest and most abundant while functional feeding group distribution corroborated the predictions of The River Continuum Concept. Besides, communities were much more taxonomically structured than functionally structured. This fact underlies the importance of the biology of organisms, and not only the functional feeding group, for substrate selection. The preference of some genera for specific substrates confirms this value. KEYWORDS.Taxonomic composition, aquatic insect, mesodistribution, indicator species.RESUMO. Analisamos a estrutura dos grupos funcionais alimentares de Ephemeroptera em cinco tipos de substratos (folhiço em corredeira, folhiço em remanso, madeira, pedras e raízes) de trechos de primeira a quinta ordens da bacia do rio Pindaíba, estado do Mato Grosso, Brasil. Verificamos, ainda, a preferência de táxons por substratos específicos através da especificidade e frequência dos organismos, e se a abordagem funcional reflete as variações dentro da comunidade. Nossos resultados agregam informações a respeito da classificação funcional dos efemerópteros e mostram que os raspadores foram os mais abundantes e os coletores-apanhadores comportam uma maior riqueza de táxons. Os córregos de terceira ordem foram os mais ricos e abundantes enquanto que as distribuições dos grupos funcionais alimentares corroboram as predições do Conceito do Continuum fluvial. Além disso, as comunidades estudadas foram muito mais estruturadas taxonomicamente do que funcionalmente. Esse fato atesta a importância da biologia dos organismos para a seleção dos substratos. A preferência de alguns gêneros por substrato específico corrobora esta importância. PALAVRAS-CHAVE. Composição taxonômica, insetos aquáticos, mesodistribuição, espécies indicadoras.O conceito de guilda alimentar foi proposto originalmente por Root (1967), definido como um grupo de espécies, indiferente da afiliação taxonômica, que exploram a mesma classe de recursos alimentares de uma maneira similar. Quando insetos aquáticos são divididos em guildas tróficas, essas categorias são conhecidas como grupos funcionais alimentares (Functional Feeding Groups -FFG), e são baseadas não só no tipo de recurso consumido, mas também nos mecanismos morfológicos e comportamentais de aquisição dess...

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Section: Discussionunclassified

Distribuição espacial das guildas tróficas e estruturação da comunidade de Ephemeroptera (Insecta) em córregos do Cerrado de Mato Grosso, Brasil

Shimano

Salles

Faria

et al. 2012

Iheringia, Sér. Zool.

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“…On the other hand, studies have shown that a lack of hydrological connectivity reduces the flow of organic and inorganic material (Thomaz et al, 2007), thus increasing the heterogeneity between them (Lopes et al, 2014;Bozelli et al, 2015). The confluence of tributaries with the main river channel minimizes these effects along the longitudinal gradient of the river, as it contributes to the increase of the organic and inorganic material, at the same time also increasing the environmental heterogeneity (Katano et al, 2009).…”

Section: Abiotic Variables and Environmental Heterogeneitymentioning

confidence: 99%

“…Several studies confirm the importance of the tributaries in attenuating the effects of oligotrophication in the main channels caused by dams. For example, the increase of taxonomic richness and density of macroinvertebrates along a longitudinal gradient in the Dam-regulated River in Japan was related to the confluence of a tributary, owing to the increase of environmental heterogeneity, food resources and recruitment of colonizers (Katano et al, 2009). In addition, an increase of nutrient concentrations in the main channel by the confluence of the tributaries showed a positive relation with density of macroinvertebrates downstream of the dam (Kiffney et al, 2006).…”

Section: Composition Diversity and Density Of Ostracod Communitiesmentioning

confidence: 99%

Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

et al. 2017

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Cite as: Higuti, J. et al. Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River. Acta Limnologica Brasiliensia, 2017, vol. 29, e120. Abstract: Aim:We assessed the effect of environmental factors on the structure of periphytic ostracods communities along the river-floodplain system of the Upper Paraná River. We predict that the higher distance from Porto Primavera dam downstream would lead to higher diversity and density of the ostracods. Methods: Periphytic ostracods (associated with root systems of the floating Eichhornia spp) were sampled during November 2013 to May 2015. Three samples were collected at each sampling site (channel of the Paraná River, tributaries and lakes). Eichhornia plants were removed from the water by hand and the plants were placed in a plastic bucket. Roots were washed for the removal of ostracods, and samples were filtered through a hand net with 160 µm mesh size. Results: The faunistic survey recorded 44 ostracods species and richness estimators indicated that sampling effort appears to be suitable to reveal the diversity of ostracods in this studied area. The highest richness and density were observed in the stretch downstream of the dam in the main channel of Paraná River and in the lakes. Beta diversity was not significantly different along the longitudinal gradient downstream and higher similarity of ostracods species composition was observed in the lakes located in the stretch downstream of the dam. Conclusions: An increase in the richness and density of ostracods were recorded in the sections downstream of the Paraná River, evidencing the importance of undammed tributaries on the ostracods community. The similarity of beta diversity amongst sampling sites may be owing to permanent hydrological connectivity amongst these environments, favouring the exchange of organisms mainly through the drift of free-floating macrophytes, and owing to the passive dispersal of drought resistant eggs of ostracods. Local abiotic factors had significant effects on abundance and distribution of some ostracod species.

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“…Sand, with a diameter of around 2 mm (Bain et al, 1985), is often used as the smallest size category of bed material in Japan, when measuring bed material size distribution (e.g. Katano et al, 2009). Because fine particles, and not simply suspended solids, promote the detachment of algae (Horner et al, 1990), we determined that algae detach when materials with a diameter greater than 2 mm were moved by water flow.…”

Section: Comparing Flow and Detachment Force With Attached Algal Biomassmentioning

confidence: 99%

Effects of sediment replenishment on riverbed material size distribution and attached algal biomass in the downstream reaches of a dam

Miyagawa

Takemon

Kobayashi

2017

Hydrological Research Letters

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Abstract:Sediment replenishment is an effective method for resupplying depleted sediment and detaching overgrown algae in the downstream reaches of a dam. In this study, we used empirical data to examine the effects of sediment replenishment on bed material size and algal biomass in the downstream reaches of the Futase Dam, Chichibu City, Saitama Prefecture, Japan. Assuming that algae detach from bed materials when they are moved by water flow, we calculated the tractive force on the riverbed (τ) and allotted a threshold bed material size in motion (D cri ) for each given τ. The resulting bed material in the downstream reaches of the dam in any year was typically finer than that in the previous year when flooding in the rainy season transported a large volume of sediment. Algal biomass was lower when monthly D cri exceeded 2 mm, versus when it was less than 2 mm. These results suggest that replenishment of fine bed materials accelerates algal detachment and restricts the accumulation of algal biomass by reducing bed stability.

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Longitudinal macroinvertebrate organization over contrasting discontinuities: effects of a dam and a tributary

Cited by 64 publications

References 44 publications

Distribuição espacial das guildas tróficas e estruturação da comunidade de Ephemeroptera (Insecta) em córregos do Cerrado de Mato Grosso, Brasil

Distribuição espacial das guildas tróficas e estruturação da comunidade de Ephemeroptera (Insecta) em córregos do Cerrado de Mato Grosso, Brasil

Periphytic community structure of Ostracoda (Crustacea) in the river-floodplain system of the Upper Paraná River

Effects of sediment replenishment on riverbed material size distribution and attached algal biomass in the downstream reaches of a dam

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