Protozoarios observados no Brasil

Pinto, C. Ariel

doi:10.1590/s0074-02761925000100006

Cited by 11 publications

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“…Three early studies provide short lists of species encountered in the State of Mato Grosso, as well as Paraguay, with little specific range or habitat information (DADAY, 1904;CUNHA, 1916;PINTO, 1925). Since the publication of these papers, very little research has been done on the sarcodines and ciliates in the state, with the exception of a study on the testacean fauna conducted by GREEN (1975) in the Rio Siio LourenCo drainage area.…”

Section: Discussionmentioning

confidence: 99%

The Seasonal Succession of Biotic Communities in Wetlands of the Tropical Wet‐and‐Dry Climatic Zone: IV. The Free‐Living Sarcodines and Ciliates of the Pantanal of Mato Grosso, Brazil

Hardoim

Heckman

1996

Intl Review of Hydrobiology

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This fourth paper in aseries on the effects of the wet-and-dry climate on the northern Pantanal, Mato Grosso, Brazil, provides an outline of the seasonal activity of sarcodine and ciliate species. Both of these groups of protozoans include grazers on bacteria and algae, predators, and omnivores. Apparently because of their more complex trophic relationships and competition from small metazoans, the fauna of these groups in the Pantanal is considerably less rich in species than the alga flora, and the populations of most species remain small throughout the year. The presence of only 97 species was recorded during a period of study.lasting about three and a half years. While the number of testacean species encountered is not notably less than expected, the number and diversity of the ciliate fauna are remarkably low compared to those encountered not only in the eutrophic waters of the temperate zones but also in water bodies in the eastern part of Brazil. The species found are almost exclusively cosmopolitan or circumtropical in distribution. E. LOPES HARDOIM and C. W. HECKMANguai. The exact locations of the sites were reported in the first paper of this series (HECKMAN, 1994a).At each of the sites, samples were taken from all microhabitats, including the open water, the epibenthos, masses of submerged macrophytes, the interrhizon as defined by HECKMAN (1994b). moist littoral areas, obvious masses of filamentous algae, arthropods, and any other material in the water among or within which protozoa might be found. The northern Pantanal is fed by a system of clear water rivers, noted for the transparency and poverty of their water in ions (HECKMAN, 1994a(HECKMAN, , 1995. The seasonal paucity of plankton and its short-term bloom near the end of the dry season were discussed in detail by HECKMAN et A/.. (1993). HECKMAN (1994b). and DE-LAMONICA-FREIRE and HECKMAN (1996). The epibenthos is usually sparce due to predation by fishes. The sediment throughout most of the Pantanal is silt or sand of a fine consistency that bakes hard when dry. It consists mainly of silicates and contains almost no calcium compounds (HECKMAN, 1995). Only where gravels or small stones have been dumped to make the shores of rivers firmer for launching boats is any substrate present that is conducive to the settlement of a community of epibenthic microorganisms. Many submerged macrophyte species are available as substrates for protozoans (PRADO et al.. 1994), and these were given special attention as a potential microhabitat. The intenhizon microcommunity (HECKMAN, 1994b) was also sampled intensively. The fine, dense rhizoids of Salvinia auriculara AUBLET were preferred by this community, but Pistia stratiores L., Eichhornia crassips (MART.) SOLMS, and even small floating plants, such as Azolla rnexicnna PRESL., were found to harbor a variety of algae, protozoans, and small metazoans. Sites at which seepage water,kept the surface of the sediment wet after the flood waters had receded were also potential habitats for protozoans and often proved to...

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Section: Discussionmentioning

confidence: 99%