Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 60. (Budapest 1968)

Berinkey, L.: The variance of Phoxinus populations

The Variance of Phoxinus Populations By L. BERINKEY, Budapest It was a remarkable phenomenon which incited me to study the populations of Phoxinus phoxinus L. The pharyngeal teeth formula of this species is 2, 5—4, 2, with hardly any deviations known from this standard, hence considered as an unvarying, good characteristic. Thus it was the more striking, when examining specimens originating from the lake Crno Jezero Durmitor Range, Montenegro, Yugoslavia, 26 July 1958, collected by Dr. Z. KASZAB, that a considerable variation in the number of pharyngeal teeth have been observed. I had 17 specimens available from the above locality, and after their examination I noted the following dental formulae : Dental formula Number of specimens 1, 4-4, 0 1 1, 4-4, 1 9 1, 4-4, 2 2 2, 4-4, 1 2 2, 4-4, 2 2 2, 5-4, 2 1 17 The fact alone is astonishing that the usual formula was valid for one specimen only beyond the extraordinary state of affairs that the majority of the exemplars (9 specimens) displayed a dental arrangement as yet never observed by any author and wholly unknown in literature. Furthermore, the strong variability of the specimens is also unusual: 6 kinds of combinations on 17 occasions. On the basis of our collection, I checked the dental formula of 12 home specimens. I found arrangements deviating from the usual in two instances only, namely 2, 5—4, 1 and 2, 5—5, 2, both known in literature. In order to establish the rate of the deviating varience between the Yugoslavian and home specimens, I made tests of homogeneity with the aid of a contingency table. Durmitor Tapolca 2, 5-4, 2 6.45 ^^-^ 1.5 4.55 9.5 11 other 10.55 ^^^^ ^-^^ 15.5 7.45 '2.5 18 17 12 29