Ábrahám Levente (szerk.): Válogatott tanulmányok V. - Natura Somogyiensis 17. (Kaposvár, 2010)

LŐKKÖS, A: A Nagy-berek vízibogarai (Coleoptera: Hydradephaga, Hydrophiloidea)

158 NATURA SOMOGYIENSIS Material and methods Water beetles were captured by sweeping with a long-handled pond net just above the substrate, on water surface, and among the submerged or emergent vegetation. Beside netting a few specimens were captured by hand-searching on the surface, from submerged stones and pieces of wood. Frequently-used method was collecting at light. For this I used a white sheet illuminated with a mercury-vapour bulb and a "black light" UV electron tube. A light trap was operated periodically in Balatonfenyves. Collecting with bottle traps was an auxiliary method. The trap uses the same mechanism as the fishing weir: beetles swimming into the opening are guided inside the trap but cannot find a way out (e.g. BALKE & HENDRICH 1987). The traps are placed in a horizontal position close to the shore. This method is especially suitable for larger diving beetles. The performance of the trap can be increased by adding bait, e.g. chicken liver or fish. Besides this I used shore trampling, shore washing, sifting, netting air plankton at sunset, pitfall trapping for capturing aquatic beetles, which have semiaquatic or terrestrial way of life. The collected specimens were killed by ethyl-acetate, and conserved dry. Water beetle specimens were identified on the basis of keys and descriptions by CSABAI (2000) and CSABAI et al. (2002). H. minutus and H. paraminutus are common, often coexistent in Hungary. The exact separation of these two species is feasible only by chromosomal analyses, if we exclude the specimens with typical habitus. It is beyond our means to execute these kinds of analyses, therefore we discuss them as pair-species. List of species In the list of new records the administration unit of the locality is given, followed by name of the locality, date of sampling, total number of captured individuals and name of the collector when it is not the author. For the common species only the name of the locality and the administration unit were mentioned in the list. In cases when the localities are more identifiable, in some geographical terms of the original Hungarian form were kept: árok, csatorna, főcsatorna, övcsatorna = channel; mészgödör = lime-pit; berek = marsh; rét = meadow; puszta = farm; vízfolyás = stream; part = shore. Abbreviations: ÁL = Levente Ábrahám; RGy = György Rozner; fcs = light trap; lp = on light; acs = netting air plancton at sunset; pt = shore trampling; pes = bottle trapping; rt = sifting. Haliplidae Haliplus obliquus (Fabricius, 1787) - Fonyód, Meszes, csatorna, 2006.09.24, 8; mészgödrök, 2005.10.28, 1. Haliplus fluviaíilis Aubé, 1 836 - Buzsák, Csisztapuszta, Pogány-völgyi-víz, 2006.07.29, 1, partt - Fonyód, Bézsenyi bozót, 2005.10.09, 1 - Fonyód, Meszes, mészgödrök, 2005.10.28, 6; Pogány-völgyi-víz, 2003.06.2627, 10, pt, 2004.07.06, 2; 2004.10.24, 3 - Somogyszentpál, Koroknai-vízfolyás, 2008.10.28, 10 - Táska, Nekota, 2004.09.23, 2 Haliplus furcatus Seidlitz, 1887 - Fonyód, Bézsenyi-bozót, 2003.08.23, 1, acs; 2005.10.09, 1 - Ordacsehi, Csehi-berek, 2005.07.19, 2; 2005.08.25, 10; 2005.09.25, 1 - Táska, Martonos, 2006.04.21, 1.