科研之友
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摘要
AIMS: We evaluated the potential of aquatic macrophyte communities as bioindicators in six small shallow lakes. METHODS: The sampling was conducted monthly for one year, during which all macrophytes were surveyed, and the water temperature, dissolved oxygen, pH, conductivity, total alkalinity, chlorophyll-a, suspended matter, total nitrogen (Nt) and total phosphorus (Pt) were measured. RESULTS: In total, forty-three species were recorded, and there were significant differences in the species richness and limnological conditions among the lakes studied. A canonical correspondence analysis showed that the concentration of nutrients (Nt and Pt), chlorophyll-a, suspended matter, dissolved oxygen and pH were the most important predictors of the distribution of macrophytes. Some emergents were related to the high concentration of nutrients, chlorophyll-a, and suspended matter. Moreover, the most submersed species were associated with environments with low nutrient concentrations and the lowest values chlorophyll-a and suspended matter. In addition, some species submerged and floating were related to low values pH, alkalinity and dissolved oxygen. Limnological differences between lakes may be cited as the main causes of the observed heterogeneous distribution of macrophytes. CONCLUSIONS: These results indicate the importance of limnological characteristics of the different environments in the macrophyte community composition and the potential role of this community as a bioindicator in shallow lakes in southern Brazil. OBJETIVO: Foi avaliado o potencial bioindicador da comunidade de macr車fitas aqu芍ticas em seis pequenos lagos rasos. M谷TODOS: O acompanhamento foi mensal durante um ano, sendo que em cada coleta, al谷m do registro de todas as esp谷cies de macr車fitas foram determinadas a temperatura da 芍gua, oxig那nio dissolvido, pH, condutividade el谷trica, alcalinidade total, clorofila-a, material em suspens o, nitrog那nio total (Nt) e f車sforo total (Pt). RESULTADOS: No total, quarenta e tr那s esp谷cies foram registradas, e ocorreram diferen as significativas na riqueza de esp谷cies e nas condi es limnol車gicas entre os lagos estudados. A an芍lise de correspond那ncia can nica mostrou que a concentra o de nutrientes (Nt e Pt), clorofila-a, material em suspens o, oxig那nio dissolvido e pH foram os mais importantes preditores da distribui o das macr車fitas aqu芍ticas. Algumas esp谷cies emergentes estiveram relacionadas alta concentra o de nutrientes, de clorofila-a, e de material em suspens o. Por outro lado, a maioria das esp谷cies submersas foram associadas a ambientes com b
