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ŠUMARSKI LIST 3-4/2019 str. 58     <-- 58 -->        PDF

detail to at least have a baseline to compare future changes, since the 11 coccinellid species recorded for Turopoljski Lug represent only 14% of the currently known Croatian ladybug fauna (Koren et al., 2012). The second alien species, D. virgifera, is a notable agricultural pest on maize crops. The first records of this species in Croatia were in 1995, near the border with Serbia (Igrc Barčić and Maceljski, 1997). Its expansion westwards was methodically tracked, and it reached the surroundings of Zagreb by 2003 (Igrc Barčić et al., 2003). Since corn is planted on some of the fields around Turopoljski Lug (the authors’ personal observation), its occurrence here is not surprising. However, it is unknown to us if it causes extensive damage to crops in the area.
To conserve the remaining wet grasslands within the study area, and all species depending on them, regular mowing and/or grazing should be re-established (Tvrtković, 1997b). This is needed to curb the advance of woody vegetation, especially the invasive Amorpha fruticosa L. However, this should be conducted in a manner that will not be so intense that it proves detrimental to the survival of herbaceous and flowering plants on which many beetle species depend. Additionally, it is possible that the water management measures implemented throughout the years could have, or have already had, a negative impact on aquatic beetles, especially G. bilineatus, due to the disappearance of suitable habitats (see Introduction and Lazowski, 1910). Further research should be conducted in this regard and, if necessary, modify and/or replace existing water management measures with more appropriate ones.
With this the Natura 2000 site Odransko Polje, which covers Turopoljski Lug, became one of only several Croatian Natura 2000 sites with a list of known beetle species. Future research, targeting specific Coleoptera groups, should add many more species, especially those that are saproxylic, to the list. A systematic mapping of the Natura 2000 species known from the area would yield much needed conservation data. Current management practices and their effect on the biodiversity of Turopoljski Lug should be evaluated and steps taken to ensure its continued survival and vitality.
We would like to thank the City of Velika Gorica for their support for the implementation of the project “BioOdra 2017”, under which this research was carried out. Our thanks also go to Vesna Zadravec, for her photo of the forest. Permits for the work were obtained from the Ministry of the Environment and Energy (Class: UP/I-612-07/17-48/78, Permit No.: 517-07-1-1-1-17-7). Special thanks go to Tamás Németh from the Hungarian Natural History Museum (NHMUS), for checking our Elateridae identifications.
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