Padrões de coerência ambiental e sincronia populacional em um reservatório tropical

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2012-02-27

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Universidade Federal de Goiás

Resumo

It is said that there is temporal coherence when environmental variables measured at different points in space vary synchronously over time. The aim of this study was to test how local and regional factors influenced the temporal coherence of limnological variables in a reservoir. In 14 sites, and for 31 months (between May 2004 and November 2009), 20 limnological variables were monitored in the Peixe Reservoir (State of Tocantins, Brazil). The coherence levels were estimated by averaging the Spearman’s correlation values between time series obtained for pairs of sites. All variables showed significant levels of coherence. The lowest values of coherence were recorded for biological variables, due to the predominant influence of local factors, and the highest for the physical variables, indicating strong climate regulation. Distance-based multiple regressions were used to model the variation in the coherence levels in function of distance and hydrological connectivity. Significant models were obtained for fifteen variables. Geographically close and hydrologically connected sites had more similar temporal dynamics. For some variables, the hydrological connectivity was even more important than distance. In general, these results indicate the influence of hydrological connectivity and regional processes (e.g., precipitation) on the similarity of the temporal dynamics of many of the monitored variables. Considering the significant levels of coherence, there is the possibility to optimize the monitoring program.

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CARVALHO, Sara Lodi de. Padrões de coerência ambiental e sincronia populacional em um reservatório tropical. 2012. 65 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2012.