Hrachovka kulovitá (Pisidium globulare) - dobrým druhem až po více než 120 letech
| Title in English | Pisidium globulare - a good species after more than 120 years |
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| Authors | |
| Year of publication | 2004 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | One of the most widely distributed and abundant species of the genus is Pisidium casertanum (Poli, 1791), formerly considered as a probably cosmopolitan species. Investigations of some authors dealing with characters of pores penetrating the shells show that pore characters must have taxonomic value.P. casertanum is also one of the most variable species of the genus. At least two distinct conchological forms, widely distributed in Europe, were distinguished in the past: var. ponderosum Stelfox, 1918 and var. globulare Clessin, 1873. The work of Araujo & Korniushin revealed significantly higher porosity of P. casertanum var. globulare. Korniushin was the first to suggest that the name Pisidium globulare Clessin, 1873 could be assigned to the probably distinct species inhabiting wetlands and widely distributed in the Palaearctic region. In the course of revision 19 records (from 18 sites) of P. globulare from the Czech Republic were found. In all cases P. globulare was collected in wetland habitats of big lowland river alluviums. Mostly these were shallow, open small pools or meadow swamps with very rich malacofauna (sometimes more than 20 species). These sites are naturally rich in trophy, which causes shortage of oxygen supply. Only in five sites P. globulare and P. casertanum were encountered together, but without any mixed form (in most cases P. casertanum was more abundant). The porosity of Czech populations of P. globulare is similar to the porosity of populations from Ukraine and Russia. The results of measurements are in very good accordance with the results presented by Araujo & Korniushin. |
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