Caracterización limnológica, fitoplanctónica y batimétrica de un lago coloreado (Laguna Negra, Parque Nacional Tierra del Fuego, Argentina)

Patricia Rodríguez; Gabriela González Garraza; Ramiro López; Andrea Coronato; Gabriela Mataloni; María Granitto; Andrea Malits; Florencia Veira

doi:10.25260/EA.23.33.1.0.2014

Authors

Patricia Rodríguez Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina. Universidad Nacional de Tierra del Fuego, Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA). Tierra del Fuego, Argentina
Gabriela González Garraza Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina. Universidad Nacional de Tierra del Fuego, Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA). Tierra del Fuego, Argentina
Ramiro López Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina
Andrea Coronato Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina. Universidad Nacional de Tierra del Fuego, Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA). Tierra del Fuego, Argentina
Gabriela Mataloni Instituto de Investigación e Ingeniería Ambiental (IIIA, CONICET), Universidad Nacional de Gral. San Martín. Gral. San Martín, Buenos Aires, Argentina
María Granitto Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina
Andrea Malits Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina
Florencia Veira

DOI:

https://doi.org/10.25260/EA.23.33.1.0.2014

Keywords:

lake, phytoplankton, peatland, Tierra del Fuego National Park

Abstract

The 4% of the Argentinian sector from Tierra del Fuego is covered with water. Colored lakes are among the most conspicuous water bodies in the Andean area, and Laguna Negra, in the National Park Tierra del Fuego, is one of them. The main physical and chemical variables were monitored and phytoplankton samples were obtained with a monthly frequency during the ice-free period, between September 2016 and March 2018 (n=15). Laguna Negra was deeper than expected, with a maximum depth of 15.5 m. In addition, this lake has high pH values (7.5±0.55), which were quite stable during the study (variation coefficient, VC=8.3%). These characteristics preclude us from considering this lake as a shallow peatland lake. Dissolved and total nutrients were low and did not show a temporal pattern of fluctuation during the study period. The same trend of no clear fluctuation was also shared by dissolved organic carbon concentration (DOC=7.7±0.78 mg/L). Taxa richness ranged between 6 and 13 throughout the study. The biovolume was inversely correlated with the vertical attenuation coefficient of light (Kd). Phytoplankton biomass (chlorophyll-a concentration, abundance, and biovolume) was generally low, with Dinobryon divergens, Mallomonas sp. and Parvodinium cf. inconspicuum being the dominant taxa. Depending on the classification used, Laguna Negra might be regarded as a humic or dystrophic lake because its color is at the edge of values used in the current literature to consider a lake as humic.

Author Biography

Patricia Rodríguez, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro Austral de Investigaciones Científicas (CADIC). Tierra del Fuego, Argentina. Universidad Nacional de Tierra del Fuego, Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA). Tierra del Fuego, Argentina

Investigadora Adjunta CONICET

Profesora Adjunta Universidad Nacional de Tierra del Fuego (Instituto de Ciencias Polares, Ambiente y Recursos Naturales)

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