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)

m NATURA SOMOGYIENSIS Depiction of the sampling sites based on the dragonfly fauna Sampling site 1. Dráva (Ortilos) The riverbank on the two sides of the port by Őrtilos railway station Examined area: 50 x 3 m riverside. Type of the water body: middle size river (code number 2220) Depiction of the sampling site based on the fauna: The number of species observed in the water between 2000 and 2004: 7 (+ 10 presumably roaming taxons) Protected species: Agrion virgo, Coenagrion ornatum, Gomphus vulgatissimus Strictly protected species: Gomphus flavipes, Ophiogomphus cecilia Number of individuals: 577 Number of larvae: 95 Number of exuviums: 62 Number of imagoes: 420 Zygoptera material: Agrion splendens (42,59%), Platycnemis pennipes (34,82%), Coenagrion ornatum (3,76%). Other species together (18,83%). In the composition of the Zygoptera fauna Ischnura elegáns, whose larva probably develops only in small numbers in the Dráva, has a relatively high proportion (14.12%). The majority of the samples collected/observed in the sampling site could have been roaming imagoes. Anisoptera material: Gomphus vulgatissimus (52,32%), Gomphus flavipes (13,24%), Ophiogomphus cecilia (11,26%). Other species together (23.18%). Out of the protected species Anaciaeschna isosceles and Orthetrum brunneum were detected in the sampling site, but only in imago stage. The development of the latter in the Dráva cannot be completely ruled out but so far its larva has not been collected from the water. Sampling site 2. Dráva (Vízvár) The river near Vízvár by the stone dam. Examined area: 50 x 3 m riverside. Type of the water body: middle size river (code number 2220) Depiction of the sampling site based on the fauna: The number of species observed in the water between 2000 and 2004: 12 (+ 12 presumably roaming taxons) Protected species: Agrion virgo, Coenagrion ornatum, Gomphus vulgatissimus Strictly protected species: Gomphus flavipes, Ophiogomphus cecilia Number of individuals: 1192 Number of larvae: 267 Number of exuviums: 496 Number of imagoes: 829 Zygoptera material: Agrion splendens (39,50%), Platycnemis pennipes (41,57%), Other species together (18,93%). Similarly to the previous sampling site, Ischnura elegáns - less characteristic of the Dráva - also represents a significant part of the collected/observed species (13.68%). Anisoptera material: Gomphus vulgatissimus (37,71%), Gomphus flavipes (14,39%), Ophiogomphus cecilia (14,03%). Other species together (33,81%). Out of the protected species Anaciaeschna isosceles and Orthetrum brunneum were detected in the sampling site, but only in imago stage. The development of the latter in the Dráva cannot be completely ruled out but so far its larva has not been collected from