Seasonal flight patterns of some common brown lacewing species (Neuroptera, Hemerobiidae) in Hungarian agricultural regions
1997
Szentkiralyi, F. (Hungarian Academy of Sciences, Budapest (Hungary). Research Inst. for Plant Protection)
Brown lacewings (Neuroptera, Hemerobiidae) were monitored long-term (1976-1992) by a light trap network in Hungarian agricultural areas. Weekly records were calculated from 10 selected lowland and 9 highland regional sites and from another 8 traps placed in apple orchards and maize fields. The characteristics of seasonal flight activity patterns of the 12 most dominant and common brown lacewing species were described. The intra- and interspecific similarity and synchrony of flight patterns were analysed by overlap index and serial cross correlation. The hemerobiids were characterised by short, medium or long seasonality, depending on the length of their flight activity pattern. Assessment of the possible number of yearly generations was supported by numbers of flight peaks and periods with higher adult activities. The results suggest that most of the hemerobiids studied are multivoltine having 2-4 (range 1-5) possible broods per season. Significant interspecific similarity was found between seasonal flight patterns caused by the great overlaps of mass flight periods during July-September. According to the intraspecific comparisons in lowlands the peaks were shifted a week earlier and the higher flight activities were allocated to the period before August, but in the highland region the increased proportions of captures were shifted to the second half of the seasons. These lags and shifts are explained by regional climatic differences
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