Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 51. (Budapest 1959)

Kovács, L. ; Gozmány, L.: Data to the quantitative relations of the Lepidoptera of the Alderwood Marshes in Ócsa, Hungary

In spite of all the above difficulties, it can never be disputed that there is a factual coenose detail, whose quantitative relations can be examined by the applied method, namely the phototropic Lepidoptera species. Their sensibility to light does not essentially differ, according to observations up to now. And there is still a possibility to establish which Lepidoptera species do react but moderately to light or not at all. If the fractional values of such species be omitted from the data of quantitative surveys gained by artificial light, we receive a picture of the proportions of the quantitative relations of phototropic species which does not essentially differ from reality. The ratio of moderately phototropic species in the materials of our surveys was, however, so insignificant that it never effected the general picture, — if the computations referring to the quantitative relations were made on the basis of the whole material. We collected a total of 15,124 Lepidopterous imagos on the above mentioned 14 occasions. Related to lamps, this amount is distributed as follows: 7,795 on Lamp I, 5,512 on Lamp II, 1,907 on Lamp III. Since only the first two lamps were active regularly, and since the third lamp shed its light onto the borderline area of two different kinds of plant associations, we used the data of only the first two lamps for our analysis. The results obtained by them are shown on Table I, namely, the first column shows the number of species, the second that of specimens, the third the mean of individual numbers related to the respective Lamp, the fractions being rounded off to a whole number. Under the column Remarks, we have indicated the occasion when there was only one active lamp. Table I. The numbers of species and specimens on the several surveys Number of Number of Mean for Remarks Date of surveys species individuals one lamp Remarks 10 June 71 535 268 17 June 117 1,160 580 1 July 109 613 Only one lamp functioning 8 July 96 712 356 15 July 186 1,776 888 22 July 178 1,529 764 29 July 139 925 463 4 August 156 747 373 12 August 140 1,695 848 19 August 144 1,894 947 84 798 399 2 September 73 573 286 12 September 61 305 153 18 September 24 45 Only one lamp functioning As is to be seen, we have observed a total of 477 species on these lamps, of which the first drew 396, the second 337 species. Species which were observed on one lamp only belonged exclusively to the group of species represented by low individual numbers, namely, 134 species were represented by 1 specimen, 66 species by 2—5 specimens, and 5 species by 6—10 specimens. It would be an