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Structure and dynamic of food webs in Andean North Patagonian freshwater systems: organic matter, light and nutrient relationships Ecología austral
Modenutti,Beatriz; Albariño,Ricardo; Bastidas Navarro,Marcela; Díaz Villanueva,Verónica; Souza,María Sol; Trochine,Carolina; Laspoumaderes,Cecilia; Cuassolo,Florencia; Mariluán,Gustavo; Buria,Leonardo; Balseiro,Esteban.
North Andean Patagonian aquatic systems include a number of deep and shallow oligotrophic lakes with a profuse hydrographic net. In this contribution we present a review of the researches carried out during the last decade in the food webs of North Patagonian water bodies. Food webs in these systems were studied based on field surveys, combining with field and laboratory experiments. Deep and shallow lakes were analyzed in relation to light, organic matter, and nutrient constraints as limiting interacting factors. In addition, we have also extended our knowledge on the structure and dynamics of stream food webs by analyzing different aspects of biotic interactions occurring both through the autotrophic and heterotrophic pathways. Since Andean lakes were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterioplankton; Phytoplankton; Zooplankton; Fish; Insects; Lakes and rivers.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2010000200003
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Effects of the interannual variations in the flood pulse mediated by hypoxia tolerance: the case of the fish assemblages in the upper Paraná River floodplain Neotropical Ichthyology
Petry,Ana Cristina; Abujanra,Fabiane; Gomes,Luiz Carlos; Julio Jr.,Horácio Ferreira; Agostinho,Angelo Antonio.
The effects of the duration of the floods on abiotic variables and attributes of species tolerant and intolerant to hypoxia (STH and SIH respectively) were evaluated in rivers and lakes of the upper Paraná River. Fish were sampled once a year, in six sampling stations, during the high water period from 2000 to 2003. There were overall reductions in dissolved oxygen levels and increases in transparency of water in lakes in years of moderate floods. The duration of floods influenced species differentially based on their tolerance to hypoxia: in moderate floods, richness of STH increased and numerical abundance and biomass of SIH reduced significantly. Opposite relationships were detected between dissolved oxygen and the attributes of STH and SIH. Dissolved...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dissolved oxygen; Duration of floods; Lakes and rivers; Neotropical; Water transparency.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200413
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