L. Forró szerk.: Miscellanea Zoologica Hungarica 9. 1994 (Budapest, 1994)

Andrikovics, S.; Hadnagy, T.: Ecological evaluation of aquatic invertebrates distribution of Apátkút Creek (Visegrádi Mountain, Hungary) in winter

Table 3. Distribution of main groups of aquatic insect 2 larvae and amphipods (ind/m ) Ephemeroptera Plecoptera Trichoptera Gammaridae Pilisszentlászló 8.4 2.4 2.8 30.6 House with chimney 30.4 5.2 9.8 81.2 Clearing 33.0 6.9 2.3 42.3 Apátkúti-mine 57.9 7.9 2.8 30.3 Hunting lodge 50.4 5.4 14.2 55.6 Magdolna-spring 45.8 12.6 1.6 18.2 Visegrád 22.5 4.2 3.8 22.9 was less than the numbers of Ephemeroptera. The Nemoura sp. was distributed on the whole length of the creek, its abundance was the biggest on the middle, clean sites (Fig. 4). The distribution of the two caddis-fly species was very interesting (two upper species in Fig.4), they almost complete each other: where the Halesus sp. was dominant, there was no Hydropsyche pellucidula and vica versa, where number of individuals of the second one was high, Halesus sp. was not found. I. II. III. IV. V. VI. VII. I 1 1 1 I 1 I Lymnephilus sp. Hydropsyche pellucidula Nemoura sp Baetis rhodani Rhithrogena semicolorata group Electrogena lateralis group Ecdyonurus venosus group Epeorus silvicola =0.1-4 ind/m

2 WEBE 3 4.1 -8 ind /m

7 ül = 8 1-17 ind

/m

2 | = 171-80 ind /m

2 Fig. 4. Distribution of some frequent species along the creek