Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 53. (Budapest 1961)

Móczár, L.: The distribution of wild bees in the lucerne fields of Hungary (Hymenoptera, Apoidea)

In the lucerne fields mentioned above, there were collected 2321 wild bees during 67 days in 1954. The wild bee species visited the flowers of the lucerne in the following distribution : Dominant species : Andrena ovatula K. 21,46% ; Subdominant species : Melitta leporina Pz. 12,84%, Eucera clypeata Er. 12,02%, Bombus lapidarius L. 11,42% ; other species : Halictus rubicundus Christ. 6,38%, Bombus terrestris L. 6,33%, Andrena flavipes Pz. 4,22%, Halictus eurygnathus Bliithg. 3,62%, Halictus maculatus Sm. 3,36%, and some 56 other species. If, aside of the mechanical summarization of the data, we also examine the role per area of the most frequent dominant and subdominant species found in the investigated lucerne fields, we get the following picture : Eucera clypeata (Com. Fejér and Kiskunság) and Melitta leporina (Com. Somogy, Nagykunság) were each dominants in 2 areas. Dominants in 1 area were : Andrena ovatula (Hajdúság), Halictus rubicundus (Com. Békés), Halictus maculatus (Com. Baranya), Melitturga clavicornis (Com. Csongrád). — Subdominants in 3 areas were Melitta leporina (Kiskunság, Comitats Baranya and Csongrád), and Andrena ovatula (Kiskunság, Nagykunság, Com. Békés). Subdominant in 2 areas was Eucera clypeata (Com. Csongrád, Nagykunság). — Subdominants in 1 area were Bombus lapidarius and Bombus terrestris (Hajdúság), Halictus eurygnathus and Andrena flavipes (Com. Csongrád). The areal distribution of stock-building dominant and subdominant species was as follows : Melitta leporina in 5 areas (Com. Somogv, Baranya, Csongrád, Kiskunság, Nagykunság), Eucera clypeata (Com. Fejér, Kiskunság, Nagykunság, Com. Csongrád) and Andrena ovatula (Kiskunság, Nagykunság, Hajdúság, Com. Békés) in 4 areas each ; then in one area Bombus lapidarius and Bombus terrestris (Hajdúság), Halictus rubicundus (Com. Békés), Halictus maculatus (Com. Baranya), Melitturga clavicornis, Halictus eurygnathus and Andrena flavipes (Com. Csongrád). On the basis of the above data, the most frequent species, according to the dominancy values, in the lucerne fields of Hungary in 1954, were Melitta leporina, Eucera clypeata and Andrena ovatula. The survey results of 1955 The surveys, similarly to those of the former year, were done in the following areas, periods, and by the collaborators, as : I. Hanság (Fertőd), 6 days between 26 July—

9 September, collector A. G i m e s i. — II. Com. Fejér (Martonvásár), 9 days between 16 July

—1 August, collector A. Szigeti, then 7 days between 19 — 26 August, collector D. Mády. — III. Com. Somogy (Balatonkiliti), 10 days between 11—30 July, collector L. M ó c z ár. — IV. Com. Baranya (Keresztespuszta), on 4 August by L. Móczár, and 7 days between 11 —18 August, collector S. Újhelyi. — V. Kiskunság (Kecskemét), 10 days between 12—28 July, collector J. Szilágyi. — Vi. Nagykunság (Karcag), 17 days between 16 July

—8 August, collector I. C s o n t o s. —IX. Com. Békés (Szarvas), 10 days between 1 —19 August, collector S. S z ő n y i; (Bánkút), 10 days between 17 — 29 August, coUector A. G i m e s i. In the above lucerne fields, we collected 2441 specimens during 80 days, between 11 July — 9 September, on the summer of 1955. The species collected on the flowers of the lucerne had the following distribution : Dominant species : Eucera clypeata Er. 40,47% ; Subdominant species : Melitta leporina Pz. 19,85% and Andrena ovatula K. 9,33% ; other species : Halictus eurygnathus Bliithg. 3,72%, Andrena flavipes Pz. 3,69%, Melitturga clavicornis Latr. 3,28%, Eucera cinerea Lep. 2,83%, Bombus lapidarius L. 2,33%, Eucera pollinosa Schmidt 1,92, Halictus euboeensis Strand 1,19%, Eucera longicornis L. 1,02%, Bombus terrestris L. 1,00%, Megachile argentata F. 0,90%, Bombus silvarum distinctus