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Revista chilena de historia natural

Print version ISSN 0716-078X


CISTERNAS, MARCO et al. Environmental comparison, through sedimentary records, between pre-Hispanic and current conditions of a lacustrine system. Rev. chil. hist. nat. [online]. 2000, vol.73, n.1, pp.151-162. ISSN 0716-078X.

Two moments of the environmental history of San Pedro lacustrine system are compared through sedimentary, pollen and diatom records. The first one corresponds to the pre-Hispanic period, representing the pristine conditions or background of the system. The second period, more recently, represents the human disturbance conditions during the late ten years. To achieve the above mentioned, sediment cores were collected from the bottom of two lakes that conform the San Pedro lacustrine system (Laguna Grande and Chica). Chronological (C14), pollen and diatom analysis of superior and inferior layers of the cores were carried out. The results indicate that the San Pedro lacustrine system has undergone drastic changes since Spanish settlement. Evolving from a natural vegetation, predominantly native, to an intense pressure of forestry use. In the same way, the qualitative water state presents a variation in its trophic features, showing a evolution from oligotrophic to eutrophic waters in Laguna Grande and from oligotrophic to mesotrophic in Laguna Chica. Finally, it is suggested the incorporation of sedimentary records analysis in the study of environmental impact and management of lakes. In this way, it will be possible to know the background (the existing pre-Hispanic conditions) and the response of aquatic ecosystem to the human influences

Keywords : environmental comparison; sedimentary records; diatoms; pollen; lakes.

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