Ábrahám Levente: Biomonitoring a Dráva folyó magyarországi szakasza mentén 2000-2004 - Natura Somogyiensis 7. (Kaposvár, 2005)

Tóth, Sándor: Monitoring dragonflies on the section of the Drava between Őrtilos and Vízvár (Insecta: Odonata) - Szitakötők monitorozása a Dráva mente Őrtilos és Vízvár közötti szakaszán (Insecta: Odonata)

TÓTH S.: MONITORING DRAGONFLIES 43 Zygoptera material: Ischnura elegáns (22,47%). Pyrrhosoma nymphula (17,24%), Coenagrion ornatum (14,64%), Agrion splendens (12,01%), Lestes barbarus (11,29%), Platycnemis pennipes (10,11%). Other species together (12,24%). Anisoptera material: Libellula depressa (23,78%), Sympetrum sanguineum (17,35%), Orthetrum brunneum (10,14%), Sympetrum vulgatum (9,55%), Sympetrum flaveolum (5,65%), Libellula fúlva (5,26%), Anaciaeschna isosceles (4,87%). Other species together (23,40%). Sampling site 9. Lankóci lake (Gyékényes) Permanent pond in a small gravel pit on Grófi út (Grófi Road) leading from the forester's lodge to Dombó-csatorna (Dombó Canal) in Lankóci-forest. Examined area: the complete riverside in the water body (about 50x2-3 m). Type of the water body: pond type other artificial still water (code number: 1350) Depiction of the sampling site based on the fauna: The number of species with proved detection in the water between 2000 and 2004: 22. In the course of the samplings, the imagoes of a further 17 species were detected. Presumably the larvae of most of these also developed there. Out of these four species are protected {Coenagrion ornatum, Lestes dryas, Libellula fulva, Orthetrum brunneum). Protected species: Anaciaeschna isosceles, Epitheca bimaculata, Gomphus vulgatissimus Strictly protected species: Leucorrhinia caudalis, Leucorrhinia pectoralis Number of individuals: 902 Number of larvae: 102 Number of exuviums: 82 Number of imagoes: 718 Zygoptera material: Lchnura elegáns (24,04%), Platycnemis pennipes (19,71%), Erythromma viridulum (16,59%), Lestes virens (8,17%), Coenagrion puella (7,45%), Lestes barbarus (5,05%). Other species together (18,99%). Anisoptera material: Sympetrum méridionale (23,88%), Sympetrum vulgatum (10,87%), Crocothemis servilia (10,23%), Orthetrum cancellatum (9,59%), Sympetrum sanguineum (8,17%), Libellula depressa (8,31%), Sympetrum striolatum (5,12%). Other species together (22,81%») Quantitative composition of the fauna (based on frequency) György Dévai and his colleagues dealt with the relative abundance of Hungarian dragonfly species determined on the basis of UTM maps in several works (DÉVAI & MISKOLCZI 1978, DÉVAI et al. 1994). With the help of the 5-grade experimental scale created by them, the dragonfly species detected in the course of monitoring the Dráva are distributed in the following way: I. Sporadic species: 6 (19 species in Hungary) II. Rare species: 7 (8 species in Hungary) III. Less frequent species: 15 (16 species in Hungary) IV. Frequent species: 19 (19 species in Hungary) V. Very frequent species: 1 (1 species in Hungary) The distribution of species according to abundance is similar to the national one. There is a significant deviation only in the proportion of species with a scattered (i.e. the rarest) presence (nation-wide 19, on the monitored section of the Dráva only 6 species can be put into this category). The abundance of the species is shown in the table summarising the data of monitoring (Table 1.).