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

Table Differences of the two lamps Date of survey in close forest 10 17 15 29 12 26 J u n e J u iy A u ; u s 1 Species Lamp I Lamp II Lamp I Lamp II Lamp I Lamp II Lamp I Lamp II Lamp I Lamp II Lamp I Lamp II Lamp I Lamp II 13 56 33 56 17 33 5 10 190 290 99 121 357 566 1 — 24 42 82 83 38 56 22 17 1 — 168 198 14 11 162 85 8 8 — 1 3 3 67 46 254 154 D. pusaria 9 1] 10 3 11 7 17 12 29 36 7 5 83 74 3 1 7 4 64 60 2 9 70 49 10 8 156 131 9 1 28 17 61 43 6 2 9 — 8 2 121 65 — — — — 15 11 18 17 3 4 15 9 51 41 3 2 2 5 1 1 6 8 42 36 19 11 73 63 6 1 1 — 6 — 27 12 50 28 13 4 103 45 — — — — 18 23 8 7 — — — — 26 30 4 — 18 18 — — 18 6 19 16 15 19 74 59 3 3 39 26 17 6 5 3 13 9 1 — 78 47 S. dimidiata — 3 1 2 2 — 1 7 8 31 23 42 36 I — 40 13 5 11 46 24 6 1 98 19 — — — 6 17 32 24 23 25 5 1 66 67 27 12 21 26 28 19 6 4 2 3 — 1 84 65 17 8 17 14 26 19 5 4 — 1 9 14 74 60 — : 3 — 39 30 2 4 ] 1 — — 45 35 1 6 3 6 1 5 6 22 13 5 4 45 27 16 11 17 12 — — 21 10 23 33 14 3 91 69 — — — 11 5 43 14 10 14 4 1 68 34 A. reticulana 12 12 23 11 — — 2 — 11 11 7 4 55 38 — 1 — — 13 10 32 26 4 4 5 54 41 12 6 17 22 1 — — — 3 10 9 12 42 50 the surveys made even on the identical days. This hinges, first of all, on external conditions. There are, primarily, considerable shifts in the courses of the moon as related to the previous year, and we have shown that a full moon will influence very unfavourably the results of surveys made by artificial light. Besides, nor do thawing and spring occur at the selfsame period, indeed, it also happens but seldom that the identical periods of subsequent years have identical weather conditions. And doubtlessly, the individual numbers of lepidopterous species more or less fluctuate during the several years, and these too in different directions. This also was openly manifest in the results of our surveys, though fluctuations in individual numbers are much bigger in ruderal territories. The majority of the surveys in 1953 happened in the spring, with but one in the middle of summer, namely, on 10 July. This almost coincided, as regards dates, with the time of our survey on 8 July of the previous year. At that time, it was the period of the full moon, reducing (as we have seen it) the results of the individual numbers. In 1953, the moon was after the last quarter, and the night warm throughout. Unfortunately, one of the lamps got out of order at 2240, causing indubitably a considerable loss. The number of species touched