In this study we analysed the dynamics of deforestation and burnings during the dry seasons from 2003 to 2008 in the Uruçuí-Una Ecological Station (UUES) and its buffer zone, located in the Cerrado biome of the southwest of Piauí, a Brazil's State, based on images from the orbital sensors CCD/CBERS-2 and TM/Landsat-5. Two dates from each of the years were interpreted and analysed: one in the middle of the dry season and one at the end. The deforested areas were expanded through the period analysed and were larger in the buffer zone, suggesting a relative protection of the UUES. New cut-offs were predictable because of the early opening of roads that would become their limits. The burning scars were larger at the end of the dry season as a consequence of the management and implementation of agricultures and pastures. In 2004 and 2007 these scars were larger probably because of the increase of dry phytomass that every three years is big enough to spread the fire originated in the anthropogenic burnings through the native vegetation. This scenario reaffirms the need for: stronger enforcement in order to stop anthropisation in the UUES and a management plan, absent for this unit so far. These proceedings are urgent also because the UUES is located in one of the most preserved regions of the Cerrado and controversially where intense anthropisation in ongoing, which stresses the lack, need and urgency of biological conservation proceedings for the Piauí´s southeastern Cerrado.Keywords: savanna, fire, deforestation, CCD/CBERS, TM/Landsat. Antropização do bioma Cerrado na Estação EcológicaUruçuí-Una estimada a partir de imagens orbitais ResumoNeste estudo, analisamos a dinâmica dos desmatamentos e queimadas do bioma Cerrado na Estação Ecológica Uruçuí-Una e sua zona tampão, localizada no sudoeste do Piauí, durante as estações secas de 2003 a 2008, com base em imagens dos sensores orbitais CCD/CBERS-2 e TM/Landsat-5. Duas datas de cada ano foram interpretadas e analisadas: uma em meados da estação seca e outra no final. A área desmatada expandiu-se no período analisado e foi maior na zona tampão, sugerindo uma proteção relativa da Estação Ecológica. Novos desmatamentos foram previsíveis devido a prévias aberturas de estradas e aceiros que posteriormente tornaram-se os limites das áreas exploradas. As queimadas foram maiores no período final do que no meio da estação seca em função da implantação e manejo das áreas agropecuárias.Em 2004 e 2007, as queimadas foram maiores provavelmente devido ao acúmulo de fitomassa seca que, a cada três anos, espalha facilmente pela vegetação nativa o fogo originado nas atividades antrópicas. Este cenário enfatiza a necessidade de reforçar a fiscalização para interromper a antropização na Estação Ecológica e de um plano de manejo, ainda ausente nesta Estação. Estas medidas são ainda mais urgentes pelo fato da Estação estar localizada em uma das regiões mais conservadas do Cerrado, mas, paradoxalmente, é onde está ocorrendo intensa antropização, o que realça a ausência, necessidade...
In this study, the diet of tadpoles of five anuran species was described. The species were collected from either lotic or lentic environments in Caatinga and the Atlantic Forest biome of northeast Brazil. The diet of these tadpoles consisted of algae, protozoa, plants, fungi and animals. Diatoms were the most important items within the diet of Leptodactylus natalensis. Trachelomonas, diatoms, Phacus and Scenedesmus were the most important items comprising the diet of Leptodactylus cf. macrosternum. Trachelomonas, Oscillatoria and Scenedesmus were the most important items comprising the diet of Pithecophus nordestinus. Diatoms and Scenodesmus were the most important items of the diet for Rhinella jimi. For Scinax x-signatus, diatoms (Atlantic Forest population), Oscillatoria, undetermined filament and pollen (Caatinga population) were the most important items consumed. Scinax x-signatus and L. natalensis from Atlantic Forest, and L. cf. macrosternum and P. nordestinus from Caatinga had diets that were the most similar. The diversity of items found in the diets of species considered may be attributed to mechanisms used by tadpoles to obtain food, which favour the acquisition of suspended materials that are highly available in the environment. We discuss the possible effects of the relationship between algae and tadpoles and the importance of recording larvae diets to better understand the dynamics of the aquatic environment and the trophic ecology of tadpoles.
A list of amphibian and reptile species that occur in open and forested areas of the Atlantic Forest in the municipality of Cruz das Almas, in the Recôncavo Baiano, eastern Brazil is presented. Field sampling occurred between January 2015 to March 2019, totalling 117 samples distributed in three areas: Parque Florestal Mata de Cazuzinha, Mata da Cascalheira, and Riacho do Machado. A total of 1,848 individuals of 69 species (31 anurans, 14 lizards, 19 snakes, two amphisbaenians, and three testudines) was recorded. Additionally, one individual of Ophiodes striatus was found in Mata da Cascalheira after the end of sampling, totalling 15 lizard species and 70 herpetofaunal species. The prevalence of open-area species and the presence of Phyllopezus lutzae, Diploglossus lessonae, and Dryadosaura nordestina in interior forest patches are discussed. Additionally, a new record of the invasive terrapin Trachemys dorbigni in the State of Bahia is reported.
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