Evolución trófica de Laguna Grande de San Pedro (VIII Región, Chile) durante el último siglo, mediante el análisis de registros sedimentarios

Cruces, Fabiola; Urrutia, Roberto; Araneda, Alberto; Torres, Laura; Cisternas, Marco; Vyverman, Wim

doi:10.4067/s0716-078x2001000200015

Cited by 5 publications

(15 citation statements)

References 8 publications

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“…Two Aulacoseira species (A. tenella and A. ambigua) were also abundant and highly represented during the two climatic periods. These two species were found in high densities in oligotrophic to supereutrophic systems, related to turbulence events (Zalat, 2000;Cruces et al, 2001;, variation in the reservoir depth, mixing regime (Caballero et al, 2006) and different degrees of eutrophication (Yang et al, 2008). During the rainy season, most species at Tanque Grande were benthic, although the upwelling to the plankton might have occurred due to water circulation (Spaulding & Edlund, 2009).…”

Section: Discussionmentioning

confidence: 99%

Influence of environmental variables on the diatom communities of oligotrophic reservoirs for public water supply (Guarulhos, Southeast Brazil)

Oliveira

Bicudo

2018

Acta Limnol. Bras.

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Aim: Our study aimed at analyzing the diatom community structure of the plankton, periphyton, and surface sediments, and their relationship with the environmental variables of two reservoirs, Tanque Grande and Cabuçu, located in the city of Guarulhos, Metropolitan Region of São Paulo. Methods Three sampling stations were stablished in each reservoir. Samples of water and periphyton were collected during the dry (August 2013) and the rainy periods (January 2014), while the sediment was sampled only during the dry period. Water abiotic limnological variables were determined and quantitative and qualitative analyses were performed after the oxidation of diatom samples. Results Both reservoirs presented low values of electrical conductivity, pH and nutrients. The diatom community was represented by 30 taxa distributed in 20 genera. The diatom diversity was higher in the plankton, with three exclusive species. All taxa collected from the surface sediments also occurred in the plankton. The periphyton was represented by six taxa that were exclusive to this habitat. Conclusion Our results indicated that the environmental variables were responsible for the limnological changes in the two reservoirs. In the studied reservoirs, the species composition of diatoms differed slightly between the plankton and the surface sediments, while we found a different community in the periphyton, with the presence of exclusive species. The two climatic periods showed differences in the abundance of species, but no considerable differences in the species composition between the two reservoirs were observed.

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Section: Discussionmentioning

confidence: 99%

Influence of environmental variables on the diatom communities of oligotrophic reservoirs for public water supply (Guarulhos, Southeast Brazil)

Oliveira

Bicudo

2018

Acta Limnol. Bras.

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“…The Mediterranean coast of Chile corresponds to a climatic and vegetational transition zone and is considered as an area sensitive to environmental changes due to anthropogenic impacts and climate alternations [6,[9][10][11][12]. Indeed, historical records have emphasised the influence of anthropogenic activities on lakes in the region over the last 500 years [13,14]. In particular, intensive periods of land use, clear-cutting of native forest and the replacement by exotic plantation forestry (Pinus radiata and Eucalyptus spp.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, intensive periods of land use, clear-cutting of native forest and the replacement by exotic plantation forestry (Pinus radiata and Eucalyptus spp. ), wheat growing, urbanisation and industrialisation processes have caused changes in the trophic status, chemical composition and water quality of the lakes [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of the Mediterranean Hispanic Model of agriculture-livestock resulted in pronounced land-use changes [18,19]. In addition, the urbanisation of the coastal zone has intensified over the last decades and generated a significant increase in nutrient inputs to watersheds, leading to gradual environmental degradation and an increase in phytoplankton productivity [13,16,[20][21][22][23]. For example, diatom studies in Laguna Grande and Laguna Chica (San Pedro de la Paz, Biobío region, south-central Chile) revealed that trophic state changes occurred after the Spanish arrival [13,20,22].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the urbanisation of the coastal zone has intensified over the last decades and generated a significant increase in nutrient inputs to watersheds, leading to gradual environmental degradation and an increase in phytoplankton productivity [13,16,[20][21][22][23]. For example, diatom studies in Laguna Grande and Laguna Chica (San Pedro de la Paz, Biobío region, south-central Chile) revealed that trophic state changes occurred after the Spanish arrival [13,20,22]. Moreover, cyanobacterial blooms have been detected in Laguna Grande in the last decades [24], which is likely related to the recent increase in temperature due to global warming and increased nutrient concentrations [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Late Holocene Paleonvironmental Evolution of Two Coastal Lakes in Mediterranean Chile and Its Implications for Conservation Planning

et al. 2021

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Paleolimnological reconstructions from the mid and high latitudes in the Southern Hemisphere are still relatively scarce. Anthropogenic impacts have evidenced trophic state changes and an increase in cyanobacterial blooms in the lacustrine system of San Pedro de la Paz in the last decades. Here, we reconstructed primary production and sedimentological changes spanning the past 2500 years in two coastal lakes in Mediterranean Chile. A multiproxy approach including sedimentological, biogenic silica, carbon and nitrogen isotopes and fossil pigments analysis in sediment cores was performed in Laguna Grande (LGSP) and Laguna Chica de San Pedro (LCSP). A marked change in the sedimentology of the lakes, likely related to the terrigenous sediment inputs derived by a transition from an arid condition in the mid-Holocene to a more humid condition in the late Holocene that favoured arboreal forest establishment at 100 BC–AD 150. A period of low primary production was identified between 850 to 1050 AC for LCSP, suggesting moist and cold conditions that were possibly related to La Niña events. In recent decades, there have been increases in primary production, probably resulting from anthropogenic disturbances. These likely include the clearance of native vegetation, the introduction of exotic tree species, and urbanisation, which in turn, resulted in nutrient inputs and hence eutrophication. We conclude that an integrated management program for both lakes is urgently needed.

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Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In-Situ and Remote Sensing Analysis for an Urban Lake in Chile

Yepez,

Velásquez,

Torres

et al. 2023

Preprint

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This study aims to develop and implement a methodology for retrieving bio-optical parameters in a lagoon located in the Biobío region, in south-central Chile by analyzing time series of Landsat-8 satellite images, specifically using the multispectral OLI sensor. The bio-optical parameters, i.e., chlorophyll-a (mg·m-3) and turbidity (NTU) were also measured in-situ synchronized with the satellite passes to minimize the impact of atmospheric distortions. To calibrate the satellite images, various atmospheric correction methods (including ACOLITE, C2RCC, iCOR, and LaSRC) were evaluated during the image preprocessing phase. Spectral signatures obtained from the scenes for each atmospheric correction method were then compared with spectral signatures acquired in-situ on the water surface. In short, the ACOLITE model emerged as the best fit for the calibration process. Subsequently, we harnessed the reflectance data derived from the ACOLITE model to establish correlations between various spectral indices and the in-situ data. The empirical retrieval models (based on band combinations) that showed superior performance, as indicated by higher R2 values, were subjected to rigorous statistical validation and optimization by applying a bootstrapping approach. Our analysis covered a spectrum of dates, seasons, and years, which allowed us to search deeper into the evolution of the trophic state associated with the lake. We identified a striking eight-year period (2014-2022) characterized by a decline in chlorophyll-a concentration in the lake possibly attributable to governmental measures in the region for the protection and conservation of the lake. The results of this initial study serve as the basis for the creation of a modern monitoring system that enhances traditional point-based methods, offering a holistic view of the ongoing processes within the lake.

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Evolución trófica de Laguna Grande de San Pedro (VIII Región, Chile) durante el último siglo, mediante el análisis de registros sedimentarios

Cited by 5 publications

References 8 publications

Influence of environmental variables on the diatom communities of oligotrophic reservoirs for public water supply (Guarulhos, Southeast Brazil)

Influence of environmental variables on the diatom communities of oligotrophic reservoirs for public water supply (Guarulhos, Southeast Brazil)

Late Holocene Paleonvironmental Evolution of Two Coastal Lakes in Mediterranean Chile and Its Implications for Conservation Planning

Spatiotemporal Variations in Biophysical Water Quality Parameters: An Integrated In-Situ and Remote Sensing Analysis for an Urban Lake in Chile

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