Diversidade da ictiofauna do Alto Rio Paraná: composição atual e perspectivas futuras

摘要: Langeani, F., Castro, R.M.C., Oyakawa, O.T., Shibatta, O.A., Pavanelli, C.S. & Casatti, L. Ichthyofauna diversity of the upper rio Parana: present composition and future perspectives. Biota Neotrop. Sep/Dez 2007 vol. 7, no. 3 http://www.biotaneotropica.org.br/v7n3/pt/abstract?article+bn03407032007. ISSN 1676-0603. A synthesis concerning fishes from Upper Parana River basin is presented, based on data fish-collections, literature, new field samples. Three hundred ten species, pertaining to 11 orders 38 families, are referred drainage, elevating anterior estimates. Concerning total 236 (76.1%) autochthonous, 67 (21.6%) allochthonous, seven (2.3%) exotic. Principal causes occurrence non-native species are: a) dispersal Lower Parana, after construction Itaipu dam, b) escapes aquaculture farms. Most (65%) small-sized, having less than 21 cm length, great majority occurs only in headwaters small streams. One best known most studied Brazil, ichthyofauna richness far reaching actual numbers, considering exponential elevation presented herein. Indeed, last years various have been described around 50 other already recognized as new, now under description. The improvement knowledge about proportional number researchers involved with studies area and, unequivocally, reflects recent initiatives stimulating incrementing taxonomic research, also improving access fish collections poor or never-sampled areas. However, if we going maintain descriptions per year decade, recognized, will be next years, a period too long. In consequence it very important that scientific community grant agencies find offer order elevate taxa year.