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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The importance of protozoan bacterivory in a subtropical environment (Lobo-Broa Reservoir, SP, Brazil)

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Author(s):
Mansano, A. S. [1] ; Hisatugo, K. F. [1] ; Hayashi, L. H. [1] ; Regali-Seleghim, M. H. [1]
Total Authors: 4
Affiliation:
[1] Univ Fed Sao Carlos UFSCar, Dept Ecol & Biol Evolut, BR-13564905 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Brazilian Journal of Biology; v. 74, n. 3, p. 569-578, AUG 2014.
Web of Science Citations: 2
Abstract

This study evaluated the importance of heterotrophic nanoflagellates (HNF) and ciliates bacterivory in a mesotrophic subtropical environment (Lobo-Broa Reservoir, Brazil) by the quantification of their ingestion rates. The in situ experiments using fluorescently labelled bacteria (FLB) were carried out bimonthly over one year (three surveys in the dry season and three in the rainy one) at the sub-surface of two sampling points that have different trophic degrees. The ingestion rates for both ciliates and HNF were higher in the meso-eutrophic region (point 2) due to the higher water temperatures, which accelerate the metabolism of protozoans and the higher bacteria densities. Concerning total protozoan bacterivory, the HNF had the greatest grazing impact on bacterial community, especially the HNF <5µm. The data showed that HNF grazing, in addition to regulating the bacteria abundance, also induced changes to the bacterial community structure, such as increasing size and numbers of bacterial filaments. The ciliates were also important to the system bacterivory, especially in point 2, where there were high densities and ingestion rates. The protozoan bottom-up control was more important in the dry season and the top-down control was more important in the rainy season, so, these two forces are equally important to the bacterial abundance regulation in this reservoir in an annual basis. (AU)

FAPESP's process: 09/12435-6 - Evaluation of the protozoan bacterivory in a mesotrophic reservoir (Lobo Reservoir, Itirapina/Brotas -SP)
Grantee:Adrislaine da Silva Mansano Dornfeld
Support Opportunities: Scholarships in Brazil - Master