Ábrahám Levente: Biomonitoring a Dráva folyó magyarországi szakasza mentén 2000-2004 - Natura Somogyiensis 7. (Kaposvár, 2005)

Uherkovich, Ákos - Nógrádi, Sára: Middle-term changes in caddisfly (Trichoptera) communities of the Hungarian part of Drava river during the years 1992–2004 - Tegzes együttesek középtávú változásai a Dráva magyarországi szakasza mentén, 1992-2004 folyamán

m NATURA SOMOGYIENSIS Fig. 17. Activity of Trichostegia minor Curt, and Limnephilus stigma Curt. in the Dráva region, 1982-2004. 17. ábra. A Trichostegia minor Curt, es a Limnephilus stigma Curt. aktivitása a Dráva vidékén, 1982-2004. Conclusions A middle term (13 years) series of samples is analysed by the activity of some caddisfly species. In the well-known locality of Vízvár some species show permanent and regular activity during the years, while others appeared in the second half of studied period. Activity of some species are also presented by taking into consideration all the data from Dráva region between 1982 and 2004. As several unforeseenable factors influence the activity, therefore these graphs cannot express the true activity. Permanent light traps functioning through many years can help us to study the changes of activity in its reality.