Resumo. O estudo ambiental envolveu a dinâmica do ambiente subaquático e a análise climática de morfologias de folhas em áreas selecionadas de meandros abandonados, com diferentes etapas geomorfológicas de deposição na planície fluvial do rio Mogi Guaçu. A área é uma transição do Cerrado e Mata Atlântica, bem preservada e localizada na Estação Ecológica de Mogi Guaçu (EEcMG). Em dique marginais ao rio, a floresta reflete a temperatura acuradamente, mas não a chuva, e isto pode ser explicado pela influência da água subterrânea, tipo de solo e temperatura. Nas margens internas da curvatura dos meandros, as assembleias de folhas refletem melhor as chuvas que temperatura, desde que esta última possa ser mudada pela proximidade de corpos de água (descarga de água subterrânea e proximidade do rio ou meandro).Abstract. The environmental study involved the dynamics of subaquatic environment and climatic analysis of leaf morphologies in selected meander bends, with different geomorphological step of deposition in the Mogi Guaçu River fluvial plain located in the northeastern portion of Sao Paulo State, Brazil. The area is a transition of Cerrado (Tropical Savanna) and Mata Atlantica (Atlantic forest), well preserved and located to the Ecological Station of Mogi-Guaçu (EEcMG). At the levee, the forest reflects the temperature accurately, but not the rainfall, and it can be explained by the influence of groundwater, type of soil, and temperature. In the inner bank of meander bend, the assemblages of leaves better reflect rainfall than temperature, since the latter parameter can be changed by the proximity of water bodies (groundwater discharge and proximity to the river or meander).Palavras-Chave -assembleia de folhas, água subterrânea, aquífero freático.
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