Publication details
Příspěvek k poznání ekologie drobných toků znečištěných důlními vodami obsahující vysoké koncentrace železa a manganu
| Title in English | Contribution to knowledge of ecology of small creeks polluted by mine waters with high contents of iron and manganese |
|---|---|
| Authors | |
| Year of publication | 2000 |
| Type | Article in Proceedings |
| Conference | XII. Limnologická konference "Limnologie na přelomu tisiciletí", Kouty nad Desnou. Sborník referátů |
| MU Faculty or unit | |
| Citation | |
| Field | Water pollution and control |
| Keywords | ecology of creeks; mine watres; iron; manganse |
| Description | Small streams in the area of closing uranium mining in the Czech-Moravian Highlands (Czech Republic) were affected by mine waters with high contents of iron and manganese. These elements have a direct toxic or inhibit effect to the bottom biota. After decreasing of contents of metals in water (under 0.2 mg.l-1 Fe and 0.05 mg.l-1 Mn) there is main effect of change of bottom habitats. Bottom of stream is hard incrusted by iron and manganese hydroxides to the dept about 10 - 15 cm. Free surface layer is very thin - only about 1 - 2 cm. Communities of bottom organisms react in firsts seasons on higher contents of metals and now predominantly on changes of habitats. Many species disappeared from affected stretches (about 150 - 250 m long), for example planarids, oligochaets, mayflies Baetis, Ephemerella, blackflies, midges etc. Some populations are very small with not normal distributions of age's steadies (Gammarus fossarum). On the other hand, permanent biota of these stretches was consisting mainly of insect's larvae stoneflies (Nemouridae) and caddisflies (Hydropsychidae). Stoneflies are probably good adapted on higher contents of iron and they have in this stretch good bid of CPOM. Larvae of net spinning caddisflies have good bid of drift of small specimens there, which have not possibility to use deeper and hyporheic zone of creek. This situation is very good example of importance of bottom layers permeability and connectivity to hyporheic zone. Incrustation of bottom is very hard ecological disturbances, which totally change quality and structure of macroinvertebrate communities and the effect is very similar as in the case of concrete panel work of bottom. |
| Related projects: |