Dinâmica funcional da comunidade microbiana heterotrófica em lagoa rasa subtropical

AUTOR(ES)

Marla Sonaira Lima

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2011

RESUMO

Aquatic ecosystems float around trends in which abrupt transitions can occur between persistents regimes, alterning the viability of the resources or the physical and chemical parameters. Following this trend, communities vary in time and space as a result of their interactions with the environment and other organisms. Microbial communities are important components in the aquatic metabolism, responsible for recycling of nutrients by remineralization, and transfering of biomass through the microbial food web. Understanding the functional microbial dynamics in lakes is an important tool to understand these systems, since the microbial composition and function may reflect the overall condition of the lake. The approach of metabolic fingerprint of microbial communities in shallow lakes was applied in the current study in Lake Mangueira, a costal and large subtropical shallow lake located in southern Brazil. The main goal was to evaluate, pioneered for this region, the heterotrophic microbial metabolic diversity through consumption patterns of available carbon sources using Biolog EcoplatesTM and verify the existence of temporal and spatial dynamics of consumption preference in these substrates. As a result, was observed temporal and spatial heterogeneity of substrate consumption preference among the Lake. Such preferences were represented by different substrate indicators, associated with seasons and sites within the Lake. The substrate utilization was related to environmental variability of factors as turbidity, water transparence, nutrients, chlorophyll a, organic carbon, water temperature. This is evidence that the functional dynamic was influenced by nutrients dynamic, production component, seasonality and compartimentation. In this way, carbon source utilization approach was a good indicator of functional dynamics in the present study to aquatic ecosystems.

ASSUNTO(S)

mangueira, lagoa (rs) lagos costeiros carbon source aquatic heterotrophic microbial assembly taim, banhado do (rs) substrato functional diversity carbono subtropical shallow lake temporal and spatial pattern

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