Benthos of Lake Mikri Prespa (North Greece) |
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Authors: | D Petridis Dr A Sinis |
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Institution: | (1) T.E.I., School of Fisheries Technology & Aquaculture, Nea Ktiria, 302 00 Mesolongi, Greece;(2) Department of Zoology, University of Thessaloniki, P.O. Box 134, 540 06 Thessaloniki, Greece |
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Abstract: | An extensive sampling of Lake Mikri Prespa was carried out in summer 1990, aimed at evaluating benthic abundance, recording
the species involved and detecting their response to some environmental variables. Three oligochaete species are endemic to
the region,Potamothrix prespaensis, Psammoryctides ochridanus variabilis andPsammoryctides ochridanus typica. The bathymetric curve of the benthos resembles that of eutrophic lakes. A great abundance ofChironomus plumosus andChaoborus flavicans occurred. Four community patterns were revealed by TWINSPAN analysis, division level two, explicitly discriminated by the
influence of substrate type, depth, C/N ratio and pH. Species richness and diversity was minimal in the profundal and maximal
in the shallows, whilst the equitability index was high in all site groups. Depth and bottom type were the most important
variables in defining species distribution. More precisely,Chironomus plumosus, Chaoborus flavicans andPotamothix hammoniensis were ubiquitous, preferring mostly deep waters.Tanytarsus sp.,Einfeldia dissidens, Cladopelma lateralis, Tanypus punctipennis andPotamothrix prespaensis favoured shallower and less productive waters with a bottom rich in decaying plant fragments, and thePsammoryctides species showed a littoral origin and regular occurrence on gravel beds. A few species displayed a particular distribution
with changes of depth, C/N ratio and pH. |
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