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• W2906032236 abstract "espanolSe analizo la diversidad de la palinoflora correspondiente a estratos del Paleozoico superior de las cuencas de Parana (Brasil y Uruguay), Parnaiba y Amazonas (Brasil), utilizando datos previamente publicados. Se elaboraron curvas de diversidad total y diversidad calculadas mediante el metodo range-through y se calcularon los indices de aparicion y desaparicion de los diferentes generos utilizando como herramienta el indice de Foote. Tambien se analizaron esos parametros en diferentes grupos de esporomorfos por separado. Se observo un aumento importante de la diversidad en el Asseliano y Sakmariano y una posterior disminucion gradual hasta el Lopingiano. Los valores de los indices de aparicion fueron mas importantes que los de desaparicion y se dieron en el Asseliano, mientras que las mayores desapariciones se observaron en el Capitaniano y en menor medida en el Sakmariano. Por otra parte, las esporas y los granos de polen presentan algunas diferencias en la tendencia general de diversidad. Sin embargo, se aprecian diferencias en los patrones de aparicion y desaparicion. A pesar de los posibles sesgos, fundamentalmente relacionados con el esfuerzo de colecta, existe cierta coherencia entre la diversidad, los indices de apariciones y desapariciones y las fases climaticas propuestas para esa edad en la region. El cambio hacia un clima mas templado ocurrido en el Permico inferior estaria asociado a un aumento en el numero de generos de palinomorfos mientras que el comienzo de una fase mas arida estaria relacionado a una disminucion en la diversidad. EnglishWe have analysed the diversity of the late Paleozoic palynoflora of the Parana (Brazil and Uruguay), Parnaiba and Amazon (Brazil) basins using already published data. In order to do this the total diversity and diversity with range-through approach curves were built up, as well as Foote’s appearance and disappearance rates at the generic level. These parameters were also obtained separately for each group of sporomorphs. An important increase in diversity in the Asselian and Sakmarian and a posterior decrease until the Lopingian were observed. The values of the appearance rates were higher than those of disappearance and they peaked in the Asselian, while the highest disappearances took place in the Capitanian and, to a lesser extent, in the Sakmarian. On the other hand, spores and pollen grains show some differences in the general diversity trend. However, there are differences in the patterns of appearance and disappearance. Despite possible biases, mainly related to the collecting effort, the diversity curves and appearance and disappearance rates obtained are congruent with the climatic phases proposed for this region in these periods. The increase in the number of palynomorph genera is associated to the early Permian climatic amelioration whilst a decrease in diversity is related to the beginning of an arid phase." @default.
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• W2906032236 date "2018-12-01" @default.
• W2906032236 modified "2023-09-27" @default.
• W2906032236 title "Palynodiversity patterns and paleoclimatic changes in the late Paleozoic in Brazil and Uruguay" @default.
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• W2906032236 doi "https://doi.org/10.21701/bolgeomin.129.4.001" @default.
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