Environmental changes; Photosynthetic pigments; Sediments; Ultraviolet radiation; Global and Planetary Change; Ecology; Earth and Planetary Sciences (miscellaneous)
Abstract :
[en] Interactions among climate change, ozone depletion, and ultraviolet radiation affect aquatic ecosystems. Meteorological and biological monitoring is often too brief, however, to record the magnitudes of past changes in ultraviolet fluxes and their effects. This study presents an analysis of fossil pigments and environmental conditions in the oligotrophic Laja Lake in the Chilean Andes over a 60-year period. The age of the sediment core was determined using high-efficiency gamma spectrometry and dated with lead-210 (210Pb). Analysis of the total and specific fossil pigments from a sediment core utilized a combination of analytical methods, spectrophotometry, and high-performance liquid chromatography. Environmental variables, such as stratospheric ozone concentration, temperature, precipitation, and ultraviolet radiation explained changes in the fossil pigment scytonemin. Results showed that low cloud cover over the high mountain lake predominated, with high ultraviolet radiation and temperature values during summer months. The most abundant group was Bacillariophyceae (diatoms). The highest concentrations of the pigments (canthaxanthin echinenone, myxoxanthophyll, aphanizophyll zeaxanthin and scytonemin) that represent the cyanobacteria groups were found in the upper part of the core (cm 0–15). The trend analysis further suggested that the influence of environmental features enabled generation of ultraviolet radiation-shielding pigment in the algae communities in the high mountain lake.This study advances understanding of the interactive effects of climate change, ozone depletion, and ultraviolet radiation on aquatic ecosystems. Fossil pigments proved to be good indicators of lake-ecosystem response to climate/environmental changes, which are necessary for predicting possible effects of future climate change.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Rodríguez-López, Lien; Universidad San Sebastián, Concepción, Chile
Lami, Andrea; Institute of Water Research IRSA, Sezione di Verbania, Italy
El Ouahabi, Meriam ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Álvarez, Denisse; Faculty of Sciences, University Santo Tomas, Chile
González-Rodríguez, Lisdelys; Faculty of Engineering, University of Concepcion, Chile
Schmidt, Sabine; Environnements et Paléoenvironnements Océaniques et Continentaux Université de Bordeaux, France
Urrutia, Roberto; Environmental Science Center, EULA, University of Concepción, Chile
Language :
English
Title :
Fossil pigments and environmental conditions in the oligotrophic Laja Lake in the Chilean Andes
Lien Rodríguez-López and Lisdelys González-Rodríguez thanks the National Scientific and Technological Commission (CONICYT), Chile. Roberto Urrutia thanks the Water Resources Center for Agriculture and Mining (CHRIAM), Chile. The authors thank the Dirección General de Aguas (DGA), Dirección Meteorológica de Chile (MeteoChile), Red Agrometeorológica del Instituto de Investigaciones Agropecuarias de Chile (AGROMET INIA), and Explorador Solar y Climático CR2 (Centro de Ciencias del Clima y la Resiliencia) for providing the observation data. We declare not have any competing of interest.
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