Chaves de identificação para famílias e gêneros de gerromorpha e nepomorpha (Insecta: Heteroptera) na Amazônia central

Pereira, Domingos Leonardo Vieira; Melo, Alan Lane de; Hamada, Neusa

doi:10.1590/s1519-566x2007000200007

Cited by 17 publications

(16 citation statements)

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“…Samples were cleaned of debris and stored in 70% ethanol. We identified and counted all aquatic macroinvertebrates to the lowest reliable taxonomical level using taxonomic keys for South American freshwater insects (Costa et al 2004; Pereira et al 2007; Segura et al 2011; Hamada et al 2014).…”

Section: Methodsmentioning

confidence: 99%

Top predator introduction changes the effects of spatial isolation on freshwater community structure

Pelinson

Leibold

Schiesari

2019

Preprint

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1Spatial isolation can differentially affect the distribution of predators and thus affect lower 2 trophic levels by resulting in trophic cascades. Similarly, the introduction of top predators into 3 isolated ecosystems can cause the same cascading effects because they mostly prey upon larger 4 frequently predatory taxa, indirectly benefiting consumers. Here we experimentally tested 5 whether spatial isolation can affect the outcome and strength of the cascading effects caused by 6 fish on macroinvertebrate community structure. We found that fish did reduce the abundance of 7 predators but had no effect on consumers. Spatial isolation, however, did cause trophic cascades, 8 but only in the absence of fish. We believe this happened because fish also preyed upon 9 consumers when they increase in abundance. Additionally, and in contrast with simple 10 theoretical expectations for metacommunities, we found that the difference between ponds with 11 and without fish increased with isolation, probably because fish dampened the cascading effects 12 of spatial isolation. 13

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Section: Methodsmentioning

confidence: 99%

Top predator introduction changes the effects of spatial isolation on freshwater community structure

Pelinson

Leibold

Schiesari

2019

Preprint

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“…Most specimens were identified using taxonomic keys (e.g. Pes et al 2005;Pereira et al 2007). Taxonomic specialists A.M. Pes (Instituto Nacional de Pesquisas da Amazônia-INPA/ DCEN) and D. Pimpão (Invertebrate Collection/INPA) were also consulted for identification of Trichoptera and Mollusca, respectively.…”

Section: Macroinvertebratesmentioning

confidence: 99%

Trophic structure of macroinvertebrates in Amazonian streams impacted by anthropogenic siltation

et al. 2010

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This study assessed the results of anthropogenic sediment input on macroinvertebrate trophic structure in streams located in an area of oil and natural gas exploitation in Brazil's Amazon forest. The results indicate that macroinvertebrate communities both in streams impacted by anthropogenic sediments and in non-impacted streams are composed mainly of taxa in the following functional feeding groups: predators, gathering-collectors, scrapers, shredders and filtering-collectors.The highest densities were observed for collector-gatherers, followed by scrapers, predators, shredders and filtering-collectors. However, both the richness and the density of all groups were reduced in impacted streams. The reductions were significantly related to suspended inorganic sediment load and to the colour of suspended sediments. The relative proportion of shredders in streams impacted by anthropogenic sediments was significantly reduced as compared with the proportion observed in non-impacted streams. This resulted from lower availability of coarse particulate organic matter in these streams owing to burial of leaves and other plant material. These results indicate changes in the functioning and productivity of streams owing to anthropogenic siltation. This is because the benthic macroinvertebrate communities, sampled during this study, were dependent on the degradation of leaves, which are the primary energy source sustaining the benthic foodweb.

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“…Most specimens were identified using taxonomic keys provided by Epler (1995), Hamada and Couceiro (2003), Pes et al (2005), Pereira et al (2007) and Merritt et al (2008). Taxonomic specialists A.M. Pes (Instituto Nacional de Pesquisas da Amazônia-NPA/DCEN) and D.M.…”

Section: Macroinvertebratesmentioning

confidence: 99%

Effects of anthropogenic silt on aquatic macroinvertebrates and abiotic variables in streams in the Brazilian Amazon

et al. 2009

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Purpose While environmental risks associated with petroleum extraction such as oil spills or leaks are relatively well known, little attention has been given to the impacts of silt. The increase in petroleum exploitation in Amazonia has resulted in sediment input to aquatic systems, with impacts on their biodiversity. Here we use a combination of field measurements and statistical analyses to evaluate the impacts of anthropogenic silt derived from the construction of roads, borrow pits, and wells during the terrestrial development of gas and oil, on macroinvertebrate communities in streams of the Urucu Petroleum Province in the Central Brazilian Amazon. Material and methods Ten impacted and nine nonimpacted streams were sampled in January, April, and November of 2007. Macroinvertebrates were sampled along a 100-m continuous reach in each stream at 10-m intervals using a dip net. Abiotic variables including, a siltation index (SI), suspended inorganic sediment (SIS), sediment color index (SCI), suspend organic sediment (SOS), pH, electrical conductivity, dissolved oxygen, temperature, water velocity, channel width, and depth, were measured at three equidistant points in each stream (∼30-m intervals). Results and discussion SI did not differ between impacted and undisturbed streams. SIS was higher and SCI lower (more reddish) in impacted than in non-impacted streams. SCI had a positive and SIS a negative effect on both macroinvertebrate richness and density. SIS and SCI also influenced macrophyte taxonomic composition. In impacted streams, taxonomic richness and density were 1.5 times lower than in non-impacted streams. No taxon was significantly associated with impacted streams. SIS was positively correlated with SOS and electrical conductivity while SCI was negatively correlated with SOS, electrical conductivity, and pH. The lack of difference in SI between impacted and nonimpacted streams suggests that anthropogenic sediment does not accumulate on stream beds. The reddish color of SIS in impacted streams reflects terrestrial erosion and indicates the rapid flow of suspended sediments through these reaches, impacting macroinvertebrate richness, density, and species composition. Conclusions Anthropogenic suspended silt has had a significant negative impact on aquatic macroinvertebrate diversity and density in streams in the Urucu Petroleum Province. Soil conservation measures are needed to reduce silt inputs and restore these streams to their natural condition. Additional studies are also needed to investigate the dynamics of sediments in the impacted streams.

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Chaves de identificação para famílias e gêneros de gerromorpha e nepomorpha (Insecta: Heteroptera) na Amazônia central

Abstract: Neotropical Entomology 36(2): 210-228 (2007) várzea igapó KEY WORDS et al. et

Cited by 17 publications

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Top predator introduction changes the effects of spatial isolation on freshwater community structure

Top predator introduction changes the effects of spatial isolation on freshwater community structure

Trophic structure of macroinvertebrates in Amazonian streams impacted by anthropogenic siltation

Effects of anthropogenic silt on aquatic macroinvertebrates and abiotic variables in streams in the Brazilian Amazon

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