Abstract
The composition of semi-aquatic bug communities from eight permanent ponds from southern Transylvania was investigated between 2001 and 2004. Three of the ponds were sampled repeatedly throughout the active period of the year, while the other five were sampled only once. Microvelia reticulata (Burmeister, 1835) and Gerris argentatus Schummel, 1832 were the dominant species from the thoroughly investigated habitats. Statistical analysis proved that each of the sampled species has specific habitat preferences in relation to the modifications of the hydrological regime of the ponds (reflected by the modifications of open water areas, station sizes, and percentages of vegetation coverage). The results, obtained from the three habitats investigated throughout the active period, were confirmed by the samples taken from the other five habitats opening the discussion about the use of semi-aquatic bug communities as bioindicators of the hydrological regime for permanent ponds.
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