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The 12-hectare flood retention basin of Roseldorf is a highly structured wet habitat, which supports a surprisingly high bird diversity.
Built in 2004, the retention basin undergoes an ongoing succession and change of habitat types. After loosing it's open character through the establishment of willow, alder and reed stands, it is now a very diverse, mostly flooded area of open water, reed beds and young alluvial forest. The construction activity of Eurasian Beavers alters the landscape regularly and creates more open habitats, where the beaver fells the young trees.
The basin holds significant numbers of different warbler species such as sävsångare, rörsångare, trastsångare, kärrsångare, gräshoppsångare and vassångare and also svarthakad buskskvätta and brun kärrhök. Breeding has been documented for dvärgrördrom and natthäger. Fasan, rapphöna, vattenrall, turturduva and Sävsparv are regular or abundant breeding birds. Big flocks of stare use the reed beds for roosting at night, so by the end of May, it is worth to check them for rosenstare. ladusvala also sleeps communally in the reed and attacks of sparvhök and lärkfalk can be seen regularly at dusk.
Overflying birds of prey, which can be seen quite regularly, include kejsarörn, havsörn, tatarfalk and ängshök. On migration, the area provides roosting habitat for bigger numbers of songbird migrants and surely has potential to produce rarity sightings as well. citronärla has already been recorded, but the area is not covered well by birders, so most rarities surely pass unnoticed.
Winter visitors include the regular species blå kärrhök and fjällvråk, but also a record of rördrom.
Access is easiest by car, but public busses service Roseldorf station which is approx. a 10 minute walk to the edge of the basin. Please follow the cirular route (2 km) and do not leave the track in order to not disturb any wildlife. It is definitely not recommended to enter the basin itself, as it is flooded in huge areas anyways. Click on the P in the map for directions.
Latest sightings can be seen on Ornitho.at, which is also recommended for submitting your personal sightings. See the clickable link below.
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