![]() O objetivo deste trabalho foi avaliar os aspectos ecológicos da ação do antimicrobiano oxitetraciclina (OTC) sobre a densidade e diversidade bacterianas de um sistema de água doce. A classe dos antimicrobianos é uma das que causa grande preocupação devido aos potenciais efeitos negativos sobre a comunidade microbiana que desempenha papel crucial nos processos, dinâmica e estabilidade dos ecossistemas. Resíduos de medicamentos são frequentemente encontrados em matrizes ambientais. RCM can magnify the rate of change in the original data, and facilitate the detection of influences in ecotoxicological studies. The influence of OTC on RCM was larger than on CR, thus the effect of OCT on the metabolism of heterotrophs was far more severe than expected from CR. Finally, relative community metabolism (RCM) of the heterotrophic community was obtained by calculating the ratio of HRexp to HRtheo that indicates changes in specific respiration rates as a whole in the community. We defined the sum of the population respirations across all heterotrophs as ‘theoretical respiration rate of heterotrophs’ (HRtheo). ![]() Next, the population respiration of each heterotroph was calculated from the direct measure of population abundance and the assumed constant of per-capita respiration. First, ‘experimental respiration rate of heterotrophs’ (HRexp) was obtained by CR minus algal respiration that is calculated by 0.35 × GPP. We linked population abundance, GPP and CR to understand the relationship between these measures. We investigated the effects of OTC on population abundance of composite species, gross primary production (GPP), and community respiration (CR). ![]() and Lecane sp.), an aquatic oligochaete (Aeolosoma hemprichi), and bacteria. and Scenedesmus sp.), a blue-green alga (Tolypothrix sp.), a protozoan (Cyclidium sp.), two rotifers (Philodina sp. To investigate the ecological impacts of a widely-used antibiotic agent oxytetracycline (OTC), we prepared an aquatic microcosm consisting of two green algae (Chlorella sp. ![]()
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