Abundância de nanoflagelados heterotróficos no plâncton de reservatórios com distintos graus de trofia - DOI: 10.4025/actascibiolsci.v27i1.1358

Danielle Goeldner Pereira; Luiz Felipe Machado Velho; Thomaz Aurélio Pagioro; Fábio Amodêo Lansac-Tôha

doi:10.4025/actascibiolsci.v27i1.1358

Planktonic heterotrophic nanoflagellates abundance in reservoirs of distinct trophic state - DOI: 10.4025/actascibiolsci.v27i1.1358

Danielle Goeldner Pereira UEM
Luiz Felipe Machado Velho UEM
Thomaz Aurélio Pagioro UEM
Fábio Amodêo Lansac-Tôha

DOI: https://doi.org/10.4025/actascibiolsci.v27i1.1358

Abstract

The aim of this study was to investigate the influence of the trophic state on the planktonic heterotrophic nanoflagellates abundance from three reservoirs of the State of Paraná: Iraí (eutrophic), Rosana (mesotrophic) and Chavantes (oligotrophic). The samples were collected during dry (July) and rainy (November) periods in 2001 and were taken at the sub-surface and mixing layers of the lacustrine zone of the reservoirs. Heterotrophic nanoflagellates abundance was determined by epifluorescence microscopy, after staining with Dapi, and cells volumes were calculated aiming to estimate biomass, using a cell volume-to-carbon conversion factor. Higher values of density and biomass were observed in Iraí Reservoir, the most eutrophic environment, whereas the lower ones were registred in Chavantes Reservoir, in both studied periods. In all reservoirs, a clear vertical pattern was observed, with higher values in the sub-surface layer. The results suggested that the trophic state influenced strongly the abundance patterns of planktonic heterotrophic nanoflagellates, indicating that the resources available determined the patterns. In other words, although there certainly is a predation pressure on the heterotrophic nanoflagellates community, it is not enough to prevent that the increase of resources determine a significant enlargement in these organisms abundance

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Author Biography

Luiz Felipe Machado Velho, UEM

Possui graduação em Ciências Biológicas pela Universidade Santa Úrsula (1989), mestrado em Ecologia de Ambientes Aquáticos Continentais pela Universidade Estadual de Maringá (1996) e doutorado em Ecologia de Ambientes Aquáticos Continentais pela Universidade Estadual de Maringá (2000). Atualmente é biólogo da Universidade Estadual de Maringá. É docente e orientador no Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais.Tem experiência na área de Ecologia, com ênfase em Ecologia de comunidades, atuando principalmente nos seguintes temas: Ecologia do zooplâncton, Ecologia de protozoários planctônicos, ecologia e taxonomia de protozoários testáceos, planície de inundação, reservatórios Currículo Lattes

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Published

2008-03-26

How to Cite

Pereira, D. G., Velho, L. F. M., Pagioro, T. A., & Lansac-Tôha, F. A. (2008). Planktonic heterotrophic nanoflagellates abundance in reservoirs of distinct trophic state - DOI: 10.4025/actascibiolsci.v27i1.1358. Acta Scientiarum. Biological Sciences, 27(1), 43-50. https://doi.org/10.4025/actascibiolsci.v27i1.1358

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Issue

Vol 27 No 1 (2005)

Section

Protozoa

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