The present status of threat to the caddis flies (Trichoptera) from the rivers Şomeş, Mureş and Crişuri catchment area in Romania
The distribution of Trichoptera was analysed at 31 sampling sites distributed along different water courses, tributaries of the rivers Some?, Mure$ and the three Cri§uri, in order to determine characteristic associations of caddis flics species in the different sectors of these rivers. Beside the pe...
Elmentve itt :
| Szerző: | |
|---|---|
| Dokumentumtípus: | Könyv része |
| Megjelent: |
2002
|
| Sorozat: | Tiscia monograph series
Ecological aspects of the Tisa River Basin : 10 years anniversary regional conference 21nd - 24th March 2002., Târgu Mureş, Romania |
| Kulcsszavak: | Ökológia |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/10263 |
| Tartalmi kivonat: | The distribution of Trichoptera was analysed at 31 sampling sites distributed along different water courses, tributaries of the rivers Some?, Mure$ and the three Cri§uri, in order to determine characteristic associations of caddis flics species in the different sectors of these rivers. Beside the personal observations, the author's aim is to summarize most of the published information, as well as results of personal collecting data concerning caddis fly taxa which are vulnerable, endangered or already destroyed by human activities, with notes on altered, endangered or vulnerable habitats of Trichoptera from these catchment areas. Altogether 193 species of caddis flies have been observed since 1898 along rivers. A number of 11 species have bccome extinct in the area investigated, mostly from the large rivers and eutrophic or oligotrophy pools, in the catchments area. The other 184 species can be categorized into five groups on the basis of their conservation status: unknown (or insufficiently known), endangered, vulnerable, presumed vulnerable and not threatened. The unknown (or insufficiently known) are those that have been collected before the nineties, the recent studies do not confirm their presence in the area investigated, but they could be still present. Their habitat must be studied in the future. The endangered spccics have a few, small and isolated populations, most of the endemic and relict species also belong to this group. Most of the endangered species are living in sources, mountainous brooks and hilly streams. The situation of the threatened caddis flies can differ from a river system to an other. The number of species dwelling in the springs and brooks in the mountainous and sub mountainous area is still very high. The caddis fly community of the lower sector of these rivers is rather poor and uniform in relation with the sectors in the mountainous and hilly areas, with spccics having wide ecological tolerance. Probably a certain improvement of the water quality of these rivers is responsible for this. |
|---|---|
| Terjedelem/Fizikai jellemzők: | 149-165 |
| ISSN: | 1418-0448 |