Abstract

As part of an Euglenophyte's survey carried out during 2002-2006 at three different sites of Bom Jardim Creek, 13 Lepocinclis taxa were identified at species and infraspecific level. Bom Jardim Creek is a right side affluent of Caí River, Municipality of Triunfo, State of Rio Grande do Sul, and has its almost entire 10.5 km length within the Southern Petrochemical Pole area. Local climate is subtropical. Samplings were carried out monthly both for biological and abiotic analyses. Among the taxa identified, Lepocinclis fusiformis (Carter) Lemmermann emend. Conrad, L. ovum (Ehrenberg) Lemmermann var. dimidio-minor Deflandre and Lepocinclis salina Fritsch var. salina were the broadest geographically distributed ones in the creek during all five years, due to their standing to a wide range of environmental conditions. Seasonal species richness variation was observed in all creek sampling sites, summer being significantly different from all other climatic seasons of the year.

Highlights

  • Euglenophytes are present all over the world, especially in shallow, nutrient rich environments (Round 1983, Wetzel 2001)

  • First papers published on the Euglenophytes flora from Rio Grande do Sul State freshwater systems are simple lists of genera and species, such as the ones by Rosa et al (1974), Torgan et al (1979), Lobo & Buselato-Toniolli (1985), Rosa et al (1987) and Rosa et al (1988)

  • Present research aimed at broadening knowledge and geographical distribution of genus Lepocinclis in the State of Rio Grande do Sul and worldwide, as well as knowing the interaction of different taxa with environmental conditions during the period 2002-2006

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Summary

Introduction

Euglenophytes are present all over the world, especially in shallow, nutrient rich environments (Round 1983, Wetzel 2001). First papers published on the Euglenophytes flora from Rio Grande do Sul State freshwater systems are simple lists of genera and species, such as the ones by Rosa et al (1974), Torgan et al (1979), Lobo & Buselato-Toniolli (1985), Rosa et al (1987) and Rosa et al (1988). There is, and enormous lack of studies dealing with Lepocinclis species (most with helicoidal striae) and absolutely none that would include, for example, Euglena acus, that has longitudinal striae. Present research aimed at broadening knowledge and geographical distribution of genus Lepocinclis in the State of Rio Grande do Sul and worldwide, as well as knowing the interaction of different taxa with environmental conditions during the period 2002-2006.

Material and methods
Results and Discussion
Literature cited

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