Navegando por Assunto "Plecoptera"

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Acesso aberto (Open Access)
Padrão de distribuição de larvas de EPT (Ephemeroptera, Plecoptera, Trichoptera) em riachos na Amazônia Oriental
(Universidade Federal do Pará, 2025-03) RAMOS, Thaiz Maria; JUEN, Leandro; http://lattes.cnpq.br/1369357248133029; HTTPS://ORCID.ORG/0000-0002-6188-4386; KOROIVA, Ricardo; http://lattes.cnpq.br/3262687790057613; http://orcid.org/0000-0002-6658-0824
Dispersal is the movement of organisms between habitats in the landscape. It is essential for the establishment of species in new locations and for the maintenance of genetic diversity in the region. Its efficiency depends on the dispersal capacity of individual species, environmental variables and the distance between habitats. The mechanisms of community structuring and anthropogenic impacts on aquatic invertebrates have been assessed using approaches based on species' functional traits, but the use of this method to determine species' dispersal potential is still understudied. Therefore, the dispersal potential of most species is determined indirectly based on functional traits and mainly using expert knowledge. Based on this scenario, the aim of this dissertation was to evaluate the dispersal pattern of EPT larvae (Ephemeroptera, Plecoptera and Trichoptera) and attempt to classify the dispersal potential of genera based on functional dispersal traits and relate these traits to environmental variables. The dissertation is divided into two chapters. In Chapter 1, we examine how functional dispersal traits of EPT larvae are related to environmental conditions of rivers in the eastern Amazon. Most of the traits and their categories were negatively or positively related to some of the nine physicochemical variables selected in the study. Thus, we confirm the fact that environmental conditions influence the composition of functional dispersal traits. In Chapter 2, we classify the dispersal potential of the genera of EPT larvae based on the functional dispersal traits and after consultation with experts of each order. The Ephemeroptera was the order with the most genera with high dispersal potential, while the Plecoptera genera had medium and low values for dispersal. The Trichoptera genera had very different values for dispersal potential. We also investigated whether the dispersal ability of EPT larval genera was reflected in their abundance and prevalence in the rivers of eastern Amazonia, which was not confirmed. In our study, we found that functional traits, whether related to dispersal or not, are excellent tools to be used as proxies.
Acesso aberto (Open Access)
Plecoptera (Insecta) imaturos da Amazônia brasileira
(Universidade Federal do Pará, 2013-05-06) RIBEIRO, José Moacir Ferreira; GORAYEB, Inocêncio de Souza; http://lattes.cnpq.br/2391620537048479
This study presents for the first time, a classification of immature Plecoptera Brazilian Amazon based on specimens collected during the development of the thesis and other existing collections that were borrowed for the study (INPA, MZUSP, IEPA, MPEG). The classification is based on external morphological characters, both, those already used by other authors as others added in this study. Recent collections were made at the following locations (bacins of Apeú River and Peixe-boi River, Mountain Martírios- Andorinhas, National Forest Caxiuanã, National Forest Amapá, Mountain Tepequém). Collection methods in the field was done by net for aquatic insect with 0.4 cm mesh, steel sieve with 0.7 cm mesh and trawl with 0.3 cm mesh. After harvesting the nymphs were screened in plastic trays and copies in advanced stage of development, were packed in small styrofoam box and then transported to creation. Nymphs were grown to adults to obtain the precise relationship there between. We describe the techniques of creating new methods in plastic cups made in the very stream where they were collected and cement tank in Campus Research Goeldi Museum. Physic-chemical parameters were measured in the water collection sites as temperature, pH, dissolved oxygen and electrical conductivity, and environmental characterization of the type of background, adjacent forests. The material studied contains: nymphs of various instars that were not associated with adults, nymphs and exúviae that were created and associated with adults, adults obtained by collection and by creating nymphs. The immature been described using the terminology Hynes (1941), Harper & Stewart (1984), Froehlich (1984), Couceiro & Hamada (2003) and Olifiers et al. (2005). Were described six nymphs of the species Anacroneiria marlieri, A. minuta, A. manauensis, Macrogynoplax delicata, M. pulchra and Enderleina froehlichi; nymphs of fourteen morphospecies, eleven of Anacroneuria genus: A. sp. n. 1, A. sp. n. 2, A. sp.JMFR1, A. sp.JMFR2, A. sp.JMFR3, A. sp.JMFR4, A. sp.JMFR5, A. sp.JMFR6, A. sp.JMFR7, A. sp.JMFR8, A. sp.JMFR9, A. sp.JMFR10, A. sp.JMFR11, two of Macrogynoplax genus: M. sp.JMFR1, M. sp.JMFR2 and one of Enderleina: E. sp.JMFR1. The morphospecies are certainly new species to be described in due course after the association with adults. It presents, for the first time, a sort key for the species and morphospecies of immature Brazilian Amazon.