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extensive land use change in the Amazon Basin ( Barlow et al ., 2016 ). As such, Pu isotopes may be a valuable tool in assessing sedimentation changes in the Amazon floodplains associated with deforestation and/or urbanization. The aim of this study is to assess the potential of 240+239 Pu signatures as a geochronology tool to determine the sediment accumulation rates in the Amazon floodplain lakes of the major rivers in the Amazon forest. To achieve this aim, six sediment cores were collected from differing floodplain lakes to construct sediment dates from 1950 to

): Estimation, variance and optimal sampling of gene diversity. 1. Haploid locus. Theoretical and Applied Genetics 90: 462-470. SALO, J., R. KALLIOLA, I. HAKKINEN, Y. MAKINEN, P. NIEMELA, M. PUHAKKA and P. D. COLEY (1986): River dynamics and the diversity of Amazon lowland forest. Nature 322: 254-258. SCARANO, F. R., T. S. PEREIRA and G. ROCAS (2003): Seed germination during floatation and seedling growth of Carapa guianensis, a tree from flood-prone forests of the Amazon. Plant Ecology 168: 291-296. SWOFFORD, D. L. (2003): PAUP*. Phylogenetic Analysis Using Parsimony (*and

References A larcos , A.J., T imi , J.T. (2012): Parasite communities in three sympatric flounder species (Pleuronectiformes: Paralichthyidae): similar ecological filters driving toward repeatable assemblages. Parasitol. Res. , 110(6): 2155 – 2166. DOI: 10.1007/s00436-011-2741-5 A lcântara , N.M., T avares -D ias , M. (2015): Structure of the parasites communities in two Erythrinidae fish from Amazon River system (Brazil). Braz. J. Vet. Parasitol ., 24(2): 183 – 190. DOI: 10.1590/S1984-29612015039 A nderson , R.M., G ordon , D.M. (1982): Processes influencing

(Steindachner, 1864) is an anuran species found in many habitats, both terrestrial and aquatic, and occurs from South America to the south of North America and in Ocidental Indias ( Lima et al ., 2006 ). L. petersii is allocated in the species group Leptodactylus melanonotus and is characterized by having snout vent length varying between 32 to 40 mm for males and between 35 to 45 mm for females, being of nocturnal habits and dwelling in forests and flooded pastures, occurring in the Amazon and in the Guiana shield region ( De Sá et al ., 2014 ). As there are scarce

. Hydrol., 135, 341-369. LABAT R. A., MANGIN A., 2000: Rainfall-runoff relations for karstic springs. Part I: convolution and spectral analyses. J. Hydrol., 238, 123-148. RIBEIRO NETO A. et al., 2008: Simulation in the Amazon basin using limited data: the Madeira River. (In Portuguese with abstract in English.) Rev. Bras. Rec. Hídr., 13 , 3, 47-58. SHERMAN L. K., 1932: Stream flow from rainfall by the unit hydrograph method. Engng. News Rec., 108, 501-505.

Summary

A new species of nematode, from the family Spiruridae, is described using parasites from the esophageal mucosa of Proechimys roberti (Rodentia: Echimyidae), which were obtained during a fauna survey in the Tapirapé-Aquirí National Forest, Carajás Reserve, Brazil, Eastern Brazilian Amazon. The helminthes were collected from the esophagus, fixed and processed for light microscopy. Spirura carajaensis n. sp. differs from other species in the genus because it has a left spicule with a well-developed sheath, which is leaf-shaped and covers the terminal half of the spicule. Males and females have a small appendix on the caudal end. This structure has not been reported before for this genus. The present study reports the first record of parasitism by Spirura in rodents of the genus Proechimys in Brazil and in the Amazon biome.

[1] Chao, N. L. (2001) The Fishery, Diversity, and Conservation of Ornamental Fishes in the Rio Negro Basin, Brazil - A review of Project Piaba (1989–99). In: Chao, N. L., Petry, P., Prang, G., L. Sonneschien, Tlusty, M. (Eds) Conservation and management of ornamental fish resources of the Rio Negro Basin, Amazonia, Brazil. Manaus, Amazonas, Brazil: Editora da Universidade do Amazonas (Project Piaba). pp. 43–73 [2] Crampton, W. G. R. (2008) Ecology and life history of an Amazon floodplain cichlid: the discus fish Symphysodon (Perciformes: Cichlidae). Neotrop

. & Bonpl.: Lecythidaceae). 1. Genetic variation in natural populations. Theoretical and Applied Genetics 76: 923-928. CAVALCANTE, M. C., E. E. OLIVEIRA, M. M. MAUES and B. M. FREITAS (2012): Pollination requirements and the foraging behavior of potential pollinators of cultivated Brazil nut (Bertholletia excelsa Bonpl.) trees in Central Amazon Rainforest. Psyche 2012: 1-9. COCKERHAM, C. C. (1969): Variance of gene frequencies. Evolution 23: 72-84. DEGEN, B. and A. M. SEBBENN (2014): Genetics and tropical forests. In: PANCEL, L. and M. KÖLH, editors. Tropical Forestry

. Hydrol., 552, 44–51. DOI: 10.1016/j.jhydrol.2017.06.019 Espinoza, J.C., Segura, H., Ronchail, J., Drapeau, G., Gutierrez-Cori, O., 2016. Evolution of wet-day and dry-day frequency in the western Amazon basin: Relationship with atmospheric circulation and impacts on vegetation. Water Resources Research, 52, 8546–8560. https://doi.org/10.1002/2016WR019305 Fahimi, F., Yaseen, Z.M., El-shafie, A., 2017. Application of soft computing based hybrid models in hydrological variables modeling: a comprehensive review. Theoretical and Applied Climatology, 128, 875–903. https

and A. M. SEBBENN (2011): Effects of selective logging on the mating system and pollen dispersal of Hymenaea courbaril L. (Leguminosae) in the Eastern Brazilian Amazon as revealed by microsatellite analysis. Forest Ecology and Management 262: 1758-1765. CASCANTE, A., M. QUESADA, J. J. LOBO and E. A. FUCHS (2002): Effects of dry tropical forest fragmentation on the reproductive success and genetic structure of the tree Samanea saman. Conservation Biology 16: 137-147. CLARK, D. A. and F. C. EVANS (1954): Distance to nearest neighbour as a measure of spatial