The plankton communities from peat bog pools: Structure, temporal variation and environmental factors

• Autores: Victoria Quiroga, M.; Unrein, F.; Garraza, G.G.; Küppers, G.; Lombardo, R.; Cristina Marinone, M.; Marque, S.M.; Vinocur, A.; Mataloni, G.
• Año de publicación: 2013
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: J. Plankton Res. 2013;35(6):1234-1253
• Materia: abundance; biomass; bottom-up control; environmental factor; food web; lake ecosystem; Northern Hemisphere; peatland; plankton; temporal variation; top-down control; Tierra del Fuego [(ARC) South America]
• Institución: Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales

This is the first characterization of the structure and temporal variation of the plankton communities comprising the complete food web in five peat bog pools related to environmental factors over two consecutive ice-free periods in Tierra del Fuego (548S). Remarkably, picophytoplankton was composed solely of eukaryotic cells, surpassing the dominance expectations for these acidic water bodies, whereas testaceans were virtually absent, even as tychoplankters. Abundances of the different planktonic communities were slightly higher than those reported for Northern Hemisphere peat bogs and humic lakes. Mixotrophic nutrition prevailed among nano- and microphytoplankters, a strategy also common in humic lakes. The structures in spring of the planktonic communities were similar. In contrast, in late summer there were differences in the abundance and biomass of the different trophic compartments among small, shallow water bodies and large ones. These seem to be dictated by distinct pool size-driven patterns of water temperature variation. A general shift in the control of heterotrophic flagellates abundance in the pools occurred, changing from bottom-up regulation in spring to top-down control in late summer related to © The Author 2013.
Fil:Unrein, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Vinocur, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fil:Mataloni, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.