Acta Zoologica Cracoviensia, 4() 1959
Przyczynek do poznania fauny jętek (Ephemeroptera) okolic Krakowa
[Contribution to the knowledge of the fauna of mayflies (Ephemeroptera) in the environs of Kraków]
Abstract:
SUMMARY. The present investigation was made to gain a qualitative knowledge of the fauna of mayflies in the evirons of Kraków. The existing information on this matter may be found in the papers of following authors: Majewski (1882), Wierzejski (1883), Dziędzielewicz (1891, 1917), Mikulski (1932, 1935, 1936), and Siemińska (1954). In all, these authors name 15 species of mayflies from this territory. The investigation was made in August 1955, and in .1956 (in spring, summer, and at the beginning of autumn). The research material was collected in localities situated in a radius of ca 30 km from Kraków Different water reservoirs were visited, among them streams and rivers of various size, from mountain ones to typically lowland ones, as well as ponds. In all, samples were taken in 38 places (in 26 reservoirs). When collecting the material the author laid the chief stress on collecting nymphs; the adult forms were caught accidentally and only in the direct proximity of a given reservoir. In the collected material 40 species of mayflies wore determined, in this 30 species new for the environs of Kraków, and 6 — for Poland. The richest reservoirs (as regards the number of appearing species) are the rivers of average size, as they contain 15-20 species of mayflies. Again, the streams and ponds are the poorest in this aspect, as only 2-6 species appear there.
