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regular research paper |
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Stone-dwelling leeches
(hirudinea, clitellata) of lake hańcza (poland): different sampling methods
determine different taxonomic structures |
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Paweł KOPERSKI
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Department
of Hydrobiology, Institute of Zoology, Warsaw University, Banacha 2, 02-097
Warszawa, Poland, e-mail: koper@hydro.biol.uw.edu.pl
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Abstract:
The work concerned the taxonomic structure and densities of
assemblages of leeches inhabiting the stony littoral of oligotrophic Lake
Hańcza in North-Eastern Poland. Samples collected manually from stone
surfaces were compared with those found on artificial structures made of PVC.
The differences between the assemblages sampled by these different methods
were much greater than those between assemblages sampled manually from
natural stones at most of sampling sites. Such differences make it clear that
artificial substrates differ from a littoral stone surface in the way they
are colonized by leeches to the extent that using artficial substrates did
not prove to be a good method for study the leech community in a stony
littoral. |
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Key words: artificial structures, epilithic fauna,
Hirudinea, littoral, methods, oligotrophy, similarity |