Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2017
Erindi/veggspjald / Talk/poster V17
Höfundar / Authors: Przemyslaw Tomczyk (1), Izabela Kolodziejczyk (2), Judith Heddicke (3), Erling Ólafsson (4), Pawel Wasowicz (4)
Starfsvettvangur / Affiliations: 1) Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland 2) Laboratory of Plant Ecophysiology, Faculty of Biology and Environmental Protection, University of Łódź, Poland 3) Department of Plant Genetics, Faculty of Bioscience, University of Rostock, Rostock, Germany 4) Icelandic Institute of Natural History, Iceland
Kynnir / Presenter: Pawel Wasowicz
Recently, two new species of leafminers have been found in Iceland: a moth - Heringocrania unimaculella (Zetterstedt, 1839) [Lepidoptera: Eriocraniidae], and a sawfly - Scolioneura betuleti (Klug, 1816) [Hymenoptera: Tenthredinidae]. Both species are non-native in Iceland and are well known to be tree parasites within their natural range. Even though both species produce similar leaf mines, it is possible to tell them apart from other types of leaf damage caused by different parasites. We undertook research in Akureyri area (N Iceland) in order to quantify the damage caused by both species. Thirty-four random points were selected within the area of 1300 ha covering the town of Akureyri and its closest surroundings and the defoliation rate was assessed on a birch tree located in the nearest proximity of the randomly chosen point. We used two defoliation indicators: (1) the percent of damaged leaves and (2) the total damaged leaf area. All measurements were done using digital image analysis.
We found that mean damage per tree measured as the percent of damaged leaves was 57.88%, while mean damage measured as the total damaged leaf area was 40.44% per tree. We have also found that damage caused by mining insects was not evenly distributed across the investigated area and varied substantially between investigated trees. Two maps, showing the damage in a spatial context will be presented.