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Aquatic Sciences

, 80:42 | Cite as

Succession of microconsumers in waterlogged pampean soils (Buenos aires, Argentina) and its significance for nearby wetlands

  • Lía C. Solari
  • Karina P. Quaíni
  • Néstor A. Gabellone
Research Article

Abstract

In floodplains, the passive dispersal by drift occurs when water bodies become connected, and is a key feature offering pathways for the recolonization of periodically flooded habitats. Mesocosms with experimental flooding were used to document the succession of small invertebrates under differing hydrologic regimes with the intent of identifying which animals were capable of moving among habitats. The mesocosm experiments were performed in soils in sandy areas of the Salado-River basin including a mixed-use plot, a plot for breeding livestock, and a plot currently without any use located in different topographic positions (upper, middle, lower). Forty-seven taxa were found including ciliates, amoebae, rotifers, and microcrustaceans. The maximum total specific richness was recorded in middle soil and the minimum in upper soil because of a shorter colonization time. Higher mean densities occurred in middle and lower topographies, while the upper exhibited lower values. The ciliates and rotifers were the dominant. During the intermediate stage of flooding, the high density and biomass of the primary producers resulted in high concentration of dissolved oxygen (photosynthesis exceeded respiration). In contrast, in the final stage, low densities of microalgae led to low concentrations of dissolved oxygen and a high density of consumers (preponderance of respiration over photosynthesis). These flooded areas are significant as sources of microorganism inocula into the river. An abundance of microbiota arising from temporary wetlands and floodplains is fundamental for a successful recruitment of native-fish species.

Keywords

In-situ-soil-flooding simulation Colonization and succession of microconsumers Agricultural land Salado-River basin 

Notes

Acknowledgements

We thank to the managers, teachers, professionals, and staff of the María Cruz and Manuel Inchausti School for allowing us to stay at the School during the sampling in the school’s field and for their unconditional support of this investigation. We are grateful to Dr. Gabriela Küppers for characterizing the ciliates. We are very grateful to the reviewers and the editors for the careful reading of our manuscript and the constructive and valuable comments. Dr. Donald F. Haggerty, a retired academic career investigator and native English speaker, edited the final version of the manuscript. This work was partially funded by the Argentine Agency for Science and Technology promotion (ANPCyT), National Council of Sciences and Technology (CONICET; PIP 5612) and by the La Plata National University (Grant N484). Scientific contribution no. 1140 of the La Plata Ringuelet Limnology Institute.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Instituto de Limnología “Dr. Raúl A. Ringuelet” CCT CONICET La PlataLa PlataArgentina
  2. 2.Ministerio de Ambiente y Desarrollo SustentableBuenos AiresArgentina

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