L. Forró szerk.: Miscellanea Zoologica Hungarica 10. 1995 (Budapest, 1995)

Tittizer, T., Leuchs, H.; Banning, M.: The consequences of river impoundments for the macrozoobenthos - demonstrated at the example of the River Danube in Germany

2376 2370 2364 2360 2359 2357 2355 Danube-km |BNOV 87 «Sep 88 BSep 89 PSep 90 BSep 91 BMai 92 BAug 92 DiMai 93 E30kt 93~j Fig. 5. Present occurrence of Jaera istri in the Geisling impoundment Another example of the running water fauna in River Danube is the rheophil caddisfly Hydropsyche. Among the Hydropsyche species occurring in River Danube, H. contubernalis is the one with the greatest ecological tolerance and the widest distribution. It inhabits nearly all larger watercourses and has become meanwhile also in River Rhine one of the most frequent caddisflies (Schöll & Becker 1992). Fig. 6 illustrates its present occurrence in the Geisling impoundment. Here again, the drastic decrease in abundance towards the 2376 2370 2364 2360 2359 2357 2355 Danube-km [•Nov 87 BSep 88 BSep 89 BSep 90 BSep 91 BMai 92 BAug 92 M Mai 93 BOkt 93 | Fig. 6. Present occurrence of Hydropsyche contubernalis in the Geisling impoundment