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sediment cores were analysed from five shallow polesie lakes (eastern poland) representing trophic status from mezo – to hypertrophy. the subfossil remains of Corynocera ambigua zetterstedt 1837 were found in all the lakes, except for hypertrophic lake syczynskie. the age of the cores was between about 200– 400 years. the most abundant development of Corynocera in the lakes took place around 200 years ago. after a few decades, a sudden drop in the numbers was marked in all the lakes. it was a sign of the further, steady diminishing of the populations, until possible total extinction in the lakes kleszczow, Glebokie uścimowskie and sumin. only in the mesotrophic lake rotcze the remains were present up to the top layers of the sediments. it may suggest that the species is still present in the lake.

Corynocera ambigua (Insecta, Diptera) subfossils occurrence in recent sediments of four shallow Polesie lakes