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  • Author or Editor: B. Sahin x
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The species composition and diversity of epipelic algae and physicochemical characteristics in Limni Lake were studied between June and November 2005. The epipelic algal flora is comprised of 46 taxa from four divisions: Bacillariophyta (22), Chlorophyta (15), Euglenophyta (8) and Dinophyta (1). Gonatozygon aculeatum is a new record for Turkey. Some physical factors, such as light and temperature affected development of the epipelic algal flora. The seasonal changes in the diversity index showed an inverse pattern to total cell number. Limni Lake has eutrophic lake characteristics.

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Abstract  

We study a class of submanifolds, called Generalized Cauchy-Riemann (GCR) lightlike submanifolds of indefinite Sasakian manifolds as an umbrella of invariant, screen real, contact CR lightlike subcases [8] and real hypersurfaces [9]. We prove existence and non-existence theorems and a characterization theorem on minimal GCR-lightlike submanifolds.

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Summary  

We introduce a class of submanifolds, namely, Generalized Cauchy--Riemann (GCR) lightlike submanifolds of indefinite Kaehler manifolds. We show that this new class is an umbrella of invariant (complex), screen real [8] and CR lightlike [6] submanifolds. We study the existence (or non-existence) of this new class in an indefinite space form. Then, we prove characterization theorems on the existence of totally umbilical, irrotational screen real, complex and CR minimal lightlike submanifolds. We also give one example each of a non totally geodesic proper minimal GCR and CR lightlike submanifolds.

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