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| Ohara, Willian Massaharu; Queiroz, Luiz Jardim de; Zuanon, Jansen; Torrente-Vilara, Gislene; Vieira, Fabíola Gomes; Doria, Carolina da Costa. |
| Biological collections preserve the biodiversity of a nation. The fish collection of the Universidade Federal de Rondônia, recently established, contains about 41% of freshwater fish species known to occur in Brazil, and 24% of South America. The biological material is distributed into 1,067 species, 21,963 lots and 149,192 specimens, gathered during five years of work. From this collection, 99% of the lots have georeferenced location, and 94% of the species were sampled in the Madeira River basin, the largest tributary in flow, drainage area and sediment discharge of the Amazonas River basin. Among the 1,008 species collected in the Madeira River basin, 80% were reviewed by Brazilian, North American and French experts, and represents the highest richness... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Freshwater fish; Madeira River basin; High species richness Zoologia Brazi; Freshwater fish; Madeira River basin; High species richness Zoologia. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/26920 |
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| Leitao, Rafael P.; Zuanon, Jansen; Mouillot, David; Leal, Cecilia G.; Hughes, Robert M.; Kaufmann, Philip R.; Villeger, Sebastien; Pompeu, Paulo S.; Kasper, Daniele; De Paula, Felipe R.; Ferraz, Silvio F. B.; Gardner, Toby A.. |
| Agricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we present results of the most comprehensive multi-scale assessment of the biological condition of streams in the Amazon to date, examining functional responses of fish assemblages to land use. We sampled fish assemblages from two large human-modified regions, and characterized stream conditions by physical habitat attributes and key landscape-change... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00420/53101/75002.pdf |
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| Oberdorff, Thierry; Dias, Murilo S.; Jézéquel, Céline; Albert, James S; Arantes, Caroline C.; Bigorne, Rémy; Carvajal-valleros, Fernando M.; De Wever, Aaike; Frederico, R. G.; Hidalgo, Max; Hugueny, Bernard; Leprieur, Fabien; Maldonado, Mabel; Maldonado-ocampo, Javier; Martens, Koen; Ortega, Hernan; Sarmiento, Jaime; Tedesco, Pablo A; Torrente-vilara, Gislene; Winemiller, Kirk O.; Zuanon, Jansen. |
| Using the most comprehensive fish occurrence database, we evaluated the importance of ecological and historical drivers in diversity patterns of subdrainage basins across the Amazon system. Linear models reveal the influence of climatic conditions, habitat size and sub-basin isolation on species diversity. Unexpectedly, the species richness model also highlighted a negative upriver-downriver gradient, contrary to predictions of increasing richness at more downriver locations along fluvial gradients. This reverse gradient may be linked to the history of the Amazon drainage network, which, after isolation as western and eastern basins throughout the Miocene, only began flowing eastward 1–9 million years (Ma) ago. Our results suggest that the main center of... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70119/68101.pdf |
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