02461naa a2200289 a 450000100080000000500110000800800410001910000180006024501320007826000090021052016140021965000190183365000210185265300250187365300210189865300190191965300180193865300200195665300200197665300280199670000190202470000190204370000220206270000160208470000160210077300550211621386622022-02-14       2022    bl uuuu     u00u1 u    #d1 aMARCON, A. K.  aGrowth ring response of two Atlantic Forest tree species pre- and post-dam operation in Southern Brazil.h[electronic resource]  c2022  aHydropower plants are important sources of renewable energy, but the climatic impacts of their constructions remain poorly explored. Considering that tree growth analysis is a useful tool to identify environmental impacts, this study aimed at using climate records and tree-ring chronologies to understand possible local climate changes caused by the construction of a hydropower plant in the 1980s in the State of Paran´a, Southern Brazil. Historical climatic data were obtained from the local meteorological station and surrounding municipalities and analyzed using ANOVA and means tests. The Pettitt test was additionally used to identify change-points in the meteorological data. Wood samples from a total of 60 trees from Araucaria angustifolia (Bertol.) Kuntze (Araucariaceae) and Cedrela fissilis Vell. (Meliaceae) were collected, and tree-ring chronologies were built using dendrochronological standard procedures. Chronologies for A. angustifolia and C. fissilis represented time periods from 1800 to 2016 and 1899?2015, respectively. Tree-ring growth responses to climatic variables were evaluated by adjusting generalized mixed linear models and the Spearman correlations. Our results evidenced that the hydropower plant altered the local climate, mostly influencing the hydrological cycle by increasing local rainfall, with monthly rain volumes being statistically higher than in other meteorological stations. Significant responses in the growth of A. angustifolia were found to be associated with the water level increase caused by the dam and of C. fissilis due to the increase in cloud cover.  aClimate change  aDendrochronology  aAraucaria rainforest  aDendrocronologia  aDendroecologia  aDendroecology  aFloresta úmida  aGrowth modeling  aHydropower plant impact1 aMARTINS, K. G.1 aBOTOSSO, P. C.1 aLONGHI-SANTOS, T.1 aBLUM, C. T.1 aGALVÃO, F.  tDendrochronologiagv. 71, 125917, Feb. 2022. 10 p.