ABSTRACT. Checklist of the tecamoeba (Testacea) from Mato Grosso do Sul State, Brazil. This study compiled the information on the occurrence of the testate amoeba (Protozoa: Testacea) in the Mato Grosso do Sul State. It was recorded 19 genera and 138 infrageneric taxa in the state. All these taxa were found in the Upper Paraná River basin, and only six of them were found in the Upper Paraguay River Basin. The taxonomic diversity in the Mato Grosso do Sul state was higher than São Paulo State, and comparable to the diversity recorded in the Central west and North Brazilian regions. Despite this diversity, there are few studies with no testacea and researchers living in the state.

Há poucos estudos sobre caranguejos do Pantanal, e estes geralmente enfocam a carcinofauna de rios e lagoas. O Pantanal é a maior planície inundável do mundo, localizado em uma bacia sedimentar na região central da América do Sul, com cerca de 138 km² de área. Há duas estações, de chuva e seca, com o período de inundação começando em janeiro e terminando em abril. Neste trabalho, estudamos a distribuição de caranguejos em habitats temporariamente inundados do Pantanal Mato-Grossense. A área de estudo está localizada entre os rios Cuiabá e São Lourenço, ambos afluentes do Rio Paraguai, localizado no centro-oeste brasileiro. Realizamos coletas diárias no período de cheia do pantanal (22/02 a 03/03 de 2008). Utilizamos 20 parcelas com 25 m² cada para a coleta de dados ambientais e dos animais, mediante cerco com rede de malha 3 mm e captura com rede de arrasto de mesma malha. Removemos a vegetação e a lavamos dentro da parcela para remover animais associados. Diferenciamos os habitats em função das fitofisionomias, da disponibilidade de abrigo para animais, da forma de cobertura vegetal submersa, e da distância do rio. Estudamos o efeito dessas variáveis sobre a abundância de caranguejos associados aos habitats, através de teste de Kruskall-Wallis e regressão linear. Obtivemos densidade média de 0,63 indivíduos/m², predominantemente jovens, e amostramos as três mais abundantes das seis de espécies de Trichodactylidae da região. Houve correlação positiva com formas de cobertura submersa, principalmente gramínea, e negativa com a distância do rio Cuiabá, mostrando que a migração ou dispersão para os alagados diminui com a distância do rio e se concentra em campos nativos ou antropizados. Provavelmente as gramíneas desempenham para os caranguejos, nos alagados, o mesmo papel que as macrófitas aquáticas desempenham em corpos d'água permanentes.

<p>The Verde River basin covers several municipalities that belong to the Brazilian state of Mato Grosso do Sul. Its source begins at about 500 m of elevation, as does its main tributary, the São Domingos River. Dozens of smaller tributaries flow into the Verde River before it joins the Paraná River at an altitude of 260 m. Sedimentary rocks, such as sandstone, dominate the local geology; however, igneous rocks, such as basalt, are also found. The weather is governed by two seasons, dry (April-September) and wet (October-March).</p><p>The Verde River has undergone anthropogenic changes due to cattle farming, agriculture and, in the last decade, due to dams. Currently, there are three hydroelectric dams in the middle of the basin (Verde 4A, Verde4 and São Domingos) that compartmentalize the habitat and block the migratory paths of the local ichthyofauna.</p><p>This study analyzes the relationship between the local geochemistry, indicated by the isotopic ratio in water samples (N=52), and the isotopic ratio in fish otoliths (aragonite structure) in hundreds of specimens of different species. Isotopic analysis of otoliths is recognized in scientific literature as a tool that can provide information about the geographic range of fish in their environment.</p><p>The chemical analyses were performed using LA-ICP mass spectrometers (Neptune XT HR-Thermo) in the raster mode setting to track strontium levels from the core to the edge of each otolith. The <sup>87</sup>Sr/<sup>86</sup>Sr ratio in the water samples was always higher than 0.71; however, some sections of the basin have exceeded the isotopic ratio with values over 0.72, for example, the very first segment of the upper Verde River (0.7260), the upper and lower São Domingos River (0.7272), the Verde River after receiving water from São Domingos River, and most tributaries of the lower Verde River basin. Both the Paraná River and the middle Verde River, upstream of the São Domingos reservoir, had <sup>87</sup>Sr/<sup>86</sup>Sr ratios of below 0.72, the latter section being where we caught most of the fish.</p><p>The results for <sup>87</sup>Sr/<sup>86</sup>Sr obtained on the edge of the otolith showed consistent correspondence to the values in the water of the sites where the fish were captured. This indicates that the isotopic proportions of strontium obtained in otoliths all the way from the core to the edge must be related to the environments in which the animals grew up, which is the basis for tracing the individual spatial range. Supported by this correlation, we are now analyzing the potential, the previous (in the fish lifespan scale) and the current migratory and dispersal paths for the ichthyofauna. Considering all points, we expect that our results will contribute to a better understanding and management of the regional migratory ichthyofauna in the future.</p>

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ABSTRACT. Checklist of the free-living Copepoda (Crustacea) from Mato Grosso do Sul state. This checklist gathered the free-living Copepod information from Mato Grosso do Sul State. It was recorded 20 species for Calanoida, 26 for Cyclopoida and four for Harpacticoida. That diversity was similar to Mato Grosso State located in north frontier and quite diff erent to São Paulo State in the east frontier. Part of this diff erence could be explain by the greater area sampled in Paraguai River Basin when compares to the sampled area in the Paraná River Basin. The main ways for the knowledge increase of Copepoda in the state of Mato Grosso do Sul were discussed.