Microorganismos consumidores en suelos de la llanura de inundación del arroyo El Pescado (Buenos Aires): Experiencia en microcosmos

ZAPLARA, V. S.; SOLARI, L.; BENÍTEZ, H. H.; GABELLONE, N. A.

Revista del Museo Argentino de Ciencias Naturales

Museo de Ciencias Naturales "Bernardino Rivadavia"

Lugar: Buenos Aires; Año: 2018 vol. 20 p. 311 - 322

1514-5158

Abstract: Development of microconsumers in waterlogged soil: experience in microcosms. The pe-riodic flooding in large rivers basin favors that the organisms colonize the floodplain. Colonization events canoccur in days or weeks and many species through their resistance structures can remain in the soil after a floodevent. The objective of this work was to analyze the succession of microconsumers from soil samples taken fromthe floodplain of the El Pescado stream (Buenos Aires). Five treatments were performed with three replicateseach exposed to different waterlogging times. Temperature, conductivity, dissolved oxygen, pH and turbidity weremeasured in each experimental unit. Likewise, the concentration of total phosphorus, total dissolved phosporus,chlorophyll ?a? were estimated and the quantitative analysis of the organisms was carried out. Thirty taxa wererecorded and ciliates (9), testate amoebas (8) and rotifers (8) were better represented. The ciliates had their maxi-mum density in the initial stage with Urocentrum turbo as dominant. The testate amoebas dominated in the finalstage with Arcella and Difflugia species. The bdelloid rotifers were always present and the monogononta reachedtheir maximum density (Lecane lunaris and Plationus patulus) towards the end of the experiment. The copepodswere observed from the initial stage with larval stages and, in the final stage, with cyclopoid and harpacticoidadults (Attheyella sp. and Cletocamptus sp.). Bacterivores predominated in the initial stage, filter feeders andgrazers intermediate, and detritivores to the end. The presence of the different groups in the treatments wasrelated to their generational times and to the simulated hydroperiod.