Environmental Thresholds of Nepomorpha in Cerrado Streams, Brazilian Savannah

Giehl, Nubia F. S.; Brasil, Leandro Schlemmer; Dias-Silva, Karina; Nogueira, Denis Silva; Cabette, Helena Soares Ramos

doi:10.1007/s13744-018-0632-5

Cited by 14 publications

(8 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This variable represents the sum of dissolved ions, which directly relates to the nitrate concentration, suggesting that agricultural activities might be contributing to the variation in this variable in the sample streams [64]. The water conductivity is positively associated with deforestation [65] and environmental integrity [29] in tropical environments. There are also indications that changes in electrical conductivity may result in changes in Heteroptera communities [66,67].…”

Section: Discussionmentioning

confidence: 99%

“…Within this context, the present study aims to assess the effect of land use changes at local and landscape scales on Gerromorpha species richness and composition in streams from a region subject to multiple land-uses in the Brazilian Amazon. We hypothesize that the HII will be a better predictor of the Heteroptera communities than landscape or water quality variables [20] since this index can reflect both environmental impacts in habitat structure inside the streams and its surroundings [19,29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Environmental Changes on Gerromorpha (Heteroptera: Hemiptera) Communities from Amazonian Streams

et al. 2022

View full text Add to dashboard Cite

The presence of environmental conditions that are suitable for the development of agricultural and cattle-raising activities has favored the expansion of land use in the Brazilian Amazon. This expansion changes the environmental conditions of aquatic ecosystems by altering the structure of the streambeds and the physicochemical conditions of the water. Therefore, this manuscript aimed to assess the effect of changes in environmental conditions along a gradient of different land uses on the richness and species composition of Gerromorpha (Heteroptera: Hemiptera) communities in streams from the Brazilian Amazon. We sampled Gerromorpha communities and environmental variables (physical structure of the habitat and physicochemical characteristics of the water) in 45 streams in the municipality of Paragominas in the state of Pará, Brazil. We then performed variation partitioning analyses to assess the relative contribution of habitat structure and water physicochemical variables on the richness and species composition. The Habitat Integrity Index (HII), which measures the habitat physical structure, was the best predictor of species richness. The HII and physicochemical variables were jointly the best predictors of species composition. Our results show that Gerromorpha communities respond to gradients of environmental anthropization in the Amazon region, which reinforces the importance of habitat integrity and water quality for the maintenance of Gerromorpha communities.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Environmental Changes on Gerromorpha (Heteroptera: Hemiptera) Communities from Amazonian Streams

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Os integrantes do grupo são indivíduos neustônicos, ou seja, vivem sobre a superfície da água e são predadores, não selecionando a espécie das suas presas. Deste modo, as condições ambientais, sejam elas físicas, químicas ou físico-químicas, acabam por não inluenciar diretamente esses indivíduos (DIAS-SILVA et al, 2010;VIEIRA et al, 2015;GIEHL et al, 2018). Pode ser que a composição das espécies de presa mude e, no entanto, a oferta de alimento continue a existir.…”

Section: Discussionunclassified

“…As condições morfológicas e de integridade do ambiente afetam as comunidades aquáticas, uma vez que inluenciam no sucesso da reprodução e na obtenção de alimento (COSSINS; CRAWFORD, 2005). Mudanças nessas variáveis ambientais afetam negativamente algumas espécies mais sensíveis e acabam propiciando um aumento de abundância das espécies mais tolerantes GIEHL et al, 2018). Essas alterações diminuem a qualidade do habitat tanto na questão física (substrato e sombreamento) quanto na questão das variáveis físico-químicas, tais como pH, oxigênio dissolvido e temperatura da água (ALLAN;CASTILLO, 2007).…”

Section: Introductionunclassified

Efeito da abundância dos adultos sobre as ninfas de Gerromorpha (Heteroptera) em riachos de Cerrado no estado de Goiás

et al. 2019

View full text Add to dashboard Cite

Entender como as espécies interagem entre si e como o ambiente afeta as espécies é um dos objetivos que os ecólogos ainda buscam responder. Diante disso os nossos objetivos foram avaliar o efeito (i) da abundância de adultos de Gerromorpha, (ii) da integridade de habitat e (iii) das condições morfológicas (largura, profundidade e declividade) do riacho sobre a abundância de ninfas de Heteroptera semiaquáticos (Gerromorpha). As coletas foram realizadas em 21 córregos na região de Barro Alto e Niquelândia, no estado de Goiás. A abundância de adultos de Gerromorpha exerce efeito positivo sobre a abundância de ninfas. A integridade de habitat, as variáveis morfológicas do canal (largura, profundidade e a declividade) não exerceram efeito sobre a abundância de ninfas e de adultos de Gerromorpha. Em ambientes tropicais, adultos e ninfas de Gerromorpha coexistem sem prejuízos, e as variáveis ambientais não exercem efeito sobre a abundância de ninfas de Gerromorpha. A proteção das ninfas é importante do ponto de vista populacional, pois garante a manutenção e o crescimento das populações presentes na comunidade e, consequentemente, evita extinções locais de espécies.

show abstract

“…In addition, Rhagovelia brunae density increased while the richness decreased, probably due to decreasing competition pressure (Cunha & Juen, 2017 ). In Brazil, Giehl et al ( 2018 ) found six species associated with the most preserved sites, which did not occur in the disturbed habitats. All of these species belonged to the Naucoridae family.…”

Section: Methodsmentioning

confidence: 99%

Pollution impacts on water bugs (Nepomorpha, Gerromorpha): state of the art and their biomonitoring potential

Bakonyi

Vásárhelyi²,

Szabó

2022

Environ Monit Assess

View full text Add to dashboard Cite

As water pollution poses an increasing risk worldwide, it is timely to assess the achievements of the aquatic macroinvertebrate ecotoxicology to provide a sound basis for the discipline’s future and support the development of biomonitoring. Aquatic and semi-aquatic bugs (Hemiptera: Nepomorpha, Gerromorpha) are ubiquitous in almost all water types, sometimes in high densities, and play a significant role in organic material turnover and energy flow. Nevertheless, they are ignored in the water pollution biomonitoring schemes. Here, based on 300 papers, we review and evaluate the effects of chemical pesticides, microorganism-derived pesticides, insecticides of plant origin, heavy metals, eutrophication, salinisation and light pollution which are summarised for the first time. Our review encompasses the results of 100 laboratory and 39 semi-field/field experiments with 47 pesticides and 70 active ingredients. Pyrethroids were found to be more toxic than organochlorine, organophosphate and neonicotinoid insecticides to water bugs, like other macroinvertebrate groups. Additionally, in 10 out of 17 cases, the recommended field concentration of the pesticide was higher than the LC50 values, indicating potential hazards to water bugs. The recommended field concentrations of pesticides used in mosquito larvae control were found non-toxic to water bugs. As very few replicated studies are available, other findings on the effects of pesticides cannot be generalised. The microorganism-derived pesticide Bti appears to be safe when used at the recommended field concentration. Data indicates that plant-derived pesticides are safe with a high degree of certainty. We have identified three research areas where water bugs could be better involved in water biomonitoring. First, some Halobates spp. are excellent, and Gerris spp. are promising sentinels for Cd contamination. Second, Micronecta and, to a certain extent, Corixidae species composition is connected to and the indicator of eutrophication. Third, the species composition of the Corixidae is related to salinisation, and a preliminary method to quantify the relationship is already available. Our review highlights the potential of water bugs in water pollution monitoring.

show abstract

Environmental Thresholds of Nepomorpha in Cerrado Streams, Brazilian Savannah

Cited by 14 publications

References 45 publications

Effects of Environmental Changes on Gerromorpha (Heteroptera: Hemiptera) Communities from Amazonian Streams

Effects of Environmental Changes on Gerromorpha (Heteroptera: Hemiptera) Communities from Amazonian Streams

Efeito da abundância dos adultos sobre as ninfas de Gerromorpha (Heteroptera) em riachos de Cerrado no estado de Goiás

Pollution impacts on water bugs (Nepomorpha, Gerromorpha): state of the art and their biomonitoring potential

Contact Info

Product

Resources

About