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mainly due to the shift from an acorn-harvesting to a lumber-harvesting attitude by the people from the area and the expansion of the villages (Tvrtković, 1997a). This is evident in the reduction of the Turopoljski Lug forest’s surface area, as is evident comparing the First Military Survey maps created during the Habsburg Monarchy (Biszak et al., 2014) with modern sources (e.g. Google Earth). While the reduction in the number of bogs and other wetlands was evident by the beginning of the 20th century (Lazowski, 1910), one of the major changes when it comes to the water regime and wetland habitats was when the Sava-Odra canal was dug in 1965, to divert excess water from the Sava River away from Zagreb, as a flood prevention measure (Tvrtković, 1997a). This, and other flood prevention measures implemented throughout the years, caused a shift in the groundwater levels (Tvrtković, 1997a). Additionally, the wet grassland habitats are either drying out, or disappearing due to overgrowing. Despite this, Turopoljski Lug is still considered to be one of the most important wetland habitats in Croatia, and as such is covered by the Natura 2000 site Odransko Polje (HR2000415) (Anonymous, 2015), and the Significant Landscapes Turopoljski Lug and Odransko Polje (Anonymous, 2003).
There are only four literature sources covering the beetle fauna of Turopoljski Lug, listing a total of 51 species (Anonymous, 2015; Mikšić, 1963; Schlosser, 1878; Vujčić-Karlo and Klipa, 1998). Of those, 44 are of the Carabidae family – a result of the only as of yet systematic beetle inventory work carried out there (Vujčić-Karlo and Klipa, 1998). Based on this, it can be said that the beetle fauna of Turopolje is very poorly known. Since conservation and management should be evidence-based (Sutherland et al., 2004), and since beetles are an important component of many habitat communities as herbivores, predators and decomposers (Cálix et al., 2018; Petersen and Luxton, 1982), this lack of basic data of an important lowland forest represents a critical gap in the foundation for future actions.
To partly fill this gap and provide additional information useful for conservation and management actions in the future, we present an overview of the currently known beetle species for Turopoljski Lug, based on literature and newly collected field data.
To perform a broad screening of the beetle fauna of Turopoljski lug, 15 locations were visited from March till September 2017 (Figures 1 & 2, Table 1). Baited traps were made from plastic 1.5 l bottles by cutting off the top part of the bottles, inverting it and inserting them back into the