655 KB31 KB199320242004Durbešić, PaulaVujčić-Karlo, Snježanaštevilka:1letnik:12str. 139-150ISSN:1318-1998COBISSID:385781URN:URN:NBN:SI:doc-KBGS3K8NenPrirodoslovni muzej SlovenijeSlovensko entomološko društvo Štefana MichielijaActa entomologica slovenica (Ljubljana)CroatiafavnahroščiHrvaškainsektikrešičipopulacijska dinamikazoogeografijaGround beetle (Coleoptera: Carabidae) fauna of two oak woods in the area with two different water balances|The community structure of ground beetles had been explored on two sampling sites within the Zoological reserve Varoški Lug, situated in the plain part of Croatia at an average altitude of 105 m. Two plant subcommunities have been chosen for research: Genisto elate-Quercetum roboris caritetosum remotae (VL1) and Genisto elate-Quercetum roboris caritetosum brizoides (VL2) from the order Populetalia albae. 29 species of ground beetles with 6469 specimens have been recorded. The dominant species are Carabus ullrichi, C. granulatus, C. violaceus, Pterostichus melas and Abax parallelus. Although the distance between the sampling areas is very short and there are no obstacles which could prevent the mixing of the faunas of the two sites, their fauna is different. This difference is evident from species which inhabit the certain site, but especially by the population abundance and the annual cycles. The diversity of both communities is very high but it is higher at the site VL2. The site VL1 has acid soil with high moisture due to the underground waters especially in spring and summer. The soil at the site VL2 is pseudogley characterized by the occasional moisture with different duration of the dry and the moist phase. Once or twice a year the site VL1 is flooded. Water in the soil is an ecological factor which influences the ground beetle fauna the most, so it is possible that longer retention of water at the site VL1 is less favourable to the species dominant at the site VL2. The share of the flying species is high in both communities. Since the sampling sites are surrounded by open biotopes there is also a great number of species inhabiting open habitats or the species indifferent to the shaded habitats. The high underground waters combined with the continental climate are favourable to the hygrophilic species. The annual cycles of the beetle numbers at the site VL1 shows greater regularity than that at the site VL2. The maximum specimen activity of all species at the site VL1 is in May and June. After that the number of specimens rapidly drops. The number of beetle specimens of all species at the site VL2 is high during the whole year. The activity starts in April and lasts till SeptemberRaziskali smo sestavo združb krešičev na dveh vzorčevalnih mestih v zoološkem rezervatu Varoški lug, ki se nahaja na ravninskem delu Hrvaške, na povprečni višini 105 m. Za raziskavo smo izbrali dve rastlinski podzdružbi: Genisto elate-Quercetum roboris caritetosum remotae (VL1) in Genisto elate-Quercetum roboris caritetosum briyoides (VL2) iz reda Populetalia albae. Našli smo 29 vrst krešičev s 6469 primerki. Prevladujoče vrste so Carabus ullrichi, C. granulatus, C. violaceus, Pterostichus melas in Abax parallelus. Čeprav je razdalja med vzorčevanima območjema zelo majhna in ni ovir, ki bi lahko preprečevale mešanje favn obeh mest, se njuni favni razlikujeta. Razlika se kaže v vrstah, ki poseljujejo posamezno območje, predvsem pa v gostoti populacij in letnih ciklih. Raznovrstnost obeh združb je zelo velika, vendar je višja na mestu VL2. Mesto VL1 ima kisla tla, močno namočena s talno vodo posebno spomladi in poleti. Prst na mestu VL2 je psevdoglej, za katerega je značilna občasna namočenost z različnimi dolžinami suhega in mokrega obdobja. Mesto VL1 je enkrat ali dvakrat na leto poplavljeno. Vsebnost vode v tleh je ekološki dejavnik, ki najmočneje vpliva na favno krešičev, zato je možno, da je daljše zadrževanje vode na kraju VL1 manj ugodno za vrste, ki prevladujejo na mestu VL2. Delež letajočih vrst je visoko v obeh združbah. Ker so vzorčevalna mesta obkrožena z odprtimi predeli, je veliko tudi vrst, ki naseljujejo odprte življenjske prostore ali vrst, ki jih osenčenost ne moti. Visoka podtalnica skupaj s celinskim podnebjem je ugodna za vlagoljubne vrste. Letni cikli števila hroščev na mestu VL1 kažejo večjo rednost kot na mestu VL2. Največja dejavnost primerkov vseh vrst na mestu VL1 je v maju in juniju. Pozneje se število primerkov močno zmanjša. Število primerkov hroščev vseh vrst na kraju VL2 je visoko skozi vse leto. Dejavnost se začne v aprilu in traja do septembraTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaPrirodoslovni muzej Slovenije