Abstract
Response of diatom to fire events in watersheds of two Northern Patagonian lakes, Chile: Analysis of the sedimentary record Forest fires can generate changes in aquatic ecosystems, mainly due to increased nutrients by increased erosion and runoff. However, contradictory results were observed in the biological response of these ecosystems, depending on the environmental conditions in each region. The aim of this study was to asses, using a paleolimnological study, the response of diatoms communities in Thompson and Frio lakes located in the Region of Aysen (Northern Patagonian) to wildfires as a consequence of colonization of the area. The results indicated that the Thompson Lake presented significant changes in the composition of diatom assemblages due to fire and a post-fire recovery period. However, the Frio Lake showed no significant changes in response to the fire period, neither in diatom species composition nor in community parameters such as the absolute abundance, richness, diversity, dominance and the ratio between planktonic/benthonic diatoms. Such differences between lakes could be attributed, in order of importance, to the trophic status existing before the occurrence of fires, the watershed slope and the lake volume.
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