Navegando por Assunto "Aquatic insects"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Diversidade de presas e predadores (Insecta) em mesohabitats de córregos de Cerrado
(Museu de Ciências Naturais, 2018-12) GIEHL, Núbia França da Silva; RESENDE, Bethânia Oliveira de; SILVA, Karina Dias; NOGUEIRA, Denis Silva; CABETTE, Helena Soares Ramos; ROGES, Paulo F. S. S.
Tropical streams feature high variety of habitats and environmental gradients, which reflect on the greater richness of aquatic insects. In this way, we evaluate if the diversity of aquatic insects of prey and predator categories is influenced by the type of substrates or by longitudinal portions in Cerrado streams. Our hypothesis is that prey and predator diversity will be determined by the type of substrate, assuming that the substrate serves as a source for foraging and / or refuge. In addition, the folhiço substrate will present greater abundance and richness due to the availability of shelter and food provided by this type of substrate. There will be differences in prey and predator composition among substrates, since some species have associations with the substrate type. The portions of the stream will have no effect on the diversity of prey and predator, since in streams of up to third order does not present considerable changes in physical characteristics. The study was carried out in nascent (1st order), intermediate (2nd) and estuary (3rd), in two streams, during dry and rainy periods. Five subsamples of sand, gravel, rocks or boulders were collected, backwaters, rapids and roots (substrate). The substrate influenced all prey and predator responses (abundance, richness and composition), but the environment (longitudinal portions) did not influence the abundance and predator composition. The influence of substrates on the diversity of prey and predators evidences the importance of riparian vegetation as a source of allochthonous material in bedside streams.
Acesso aberto (Open Access)
Histórico do uso da terra e composição de gerromorpha (insecta: subordem heteroptera) em igarapés da Transxingu
(Universidade Federal do Pará, 2024-02-28) COSTA, Iluany da Silva; SILVA, Karina Dias da; http://lattes.cnpq.br/2271768102150398; https://orcid.org/0000-0001-5548-4995
The Amazon Forest faces threats due to the increasing exploitation of natural resources driven by the economic growth of the region, intensified since the exploitation of rubber between 1879 and 1912. Since the 1960s, the government has implemented economic development programs, territorial occupation and construction of highways, such as BR-230, also known as Transamazônica. This highway had a significant impact on the southwest region of Pará, especially in the Xingu River basins, contributing to disorderly deforestation and harming biodiversity, especially on the banks of water bodies. To deal with environmental problems, several analysis and monitoring methods have been developed, including remote sensing, which allows large areas to be studied in a short time. Biological monitoring is also used, as some organisms, such as aquatic insects from the infraorder Gerromorpha, are sensitive to environmental changes and can indicate the quality of the habitat. Therefore, a recent study analyzed the history of land use in the region over the last 30 years and evaluated the composition of the Gerromorpha infraorder in Transxingu streams. A large loss of vegetation cover has been observed in recent decades, especially close to roads, often related to livestock farming. However, there has been a reduction in deforestation over time, possibly due to conservation measures, such as the Action Plan for the Prevention and Control of Deforestation in the Legal Amazon (PPCDAm), creation of extractive reserves, recognition of indigenous lands and the Cadastre Rural Environmental (CAR). In the study of the composition of the Gerromorpha infraorder in the Transxingu streams, it was found that many samples were influenced by deforestation over the years. Furthermore, it was found that the integrity index of the stream's physical habitat can be more effective than geospatial metrics in assessing environmental impact. Although there were no significant differences in the Gerromorpha community between preserved and altered environments, a variation in the abundance of these organisms was noticed along environmental gradients. This indicates that the community responds to changes in the environment, regardless of the presence of specific bioindicator species. Therefore, there is a need for more studies in highly preserved environments to better understand these dynamics.
Acesso aberto (Open Access)
Histórico do uso da terra e composição de gerromorpha (insecta: subordem heteroptera) em igarapés da Transxingu
(Universidade Federal do Pará, 2024-02-28) COSTA, Iluany da Silva; SILVA, Karina Dias da; http://lattes.cnpq.br/2271768102150398; https://orcid.org/0000-0001-5548-4995
The Amazon Forest faces threats due to the increasing exploitation of natural resources driven by the economic growth of the region, intensified since the exploitation of rubber between 1879 and 1912. Since the 1960s, the government has implemented economic development programs, territorial occupation and construction of highways, such as BR230, also known as Transamazônica. This highway had a significant impact on the southwest region of Pará, especially in the Xingu River basins, contributing to disorderly deforestation and harming biodiversity, especially on the banks of water bodies. To deal with environmental problems, several analysis and monitoring methods have been developed, including remote sensing, which allows large areas to be studied in a short time. Biological monitoring is also used, as some organisms, such as aquatic insects from the infraorder Gerromorpha, are sensitive to environmental changes and can indicate the quality of the habitat. Therefore, a recent study analyzed the history of land use in the region over the last 30 years and evaluated the composition of the Gerromorpha infraorder in Transxingu streams. A large loss of vegetation cover has been observed in recent decades, especially close to roads, often related to livestock farming. However, there has been a reduction in deforestation over time, possibly due to conservation measures, such as the Action Plan for the Prevention and Control of Deforestation in the Legal Amazon (PPCDAm), creation of extractive reserves, recognition of indigenous lands and the Cadastre Rural Environmental (CAR). In the study of the composition of the Gerromorpha infraorder in the Transxingu streams, it was found that many samples were influenced by deforestation over the years. Furthermore, it was found that the integrity index of the stream's physical habitat can be more effective than geospatial metrics in assessing environmental impact. Although there were no significant differences in the Gerromorpha community between preserved and altered environments, a variation in the abundance of these organisms was noticed along environmental gradients. This indicates that the community responds to changes in the environment, regardless of the presence of specific bioindicator species. Therefore, there is a need for more studies in highly preserved environments to better understand these dynamics.