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The water bird trapping system on the ismaning reservoir near munich west germany



The water bird trapping system on the ismaning reservoir near munich west germany



Anzeiger der Ornithologischen Gesellschaft in Bayern 25(1): 1-10



1. Trapping and banding of water birds on the Ismaning reservoir has to cope with special conditions: water level change of about 1 m; shorelines and floor covered by soft mud; above all during wing-moulting season large numbers of birds are on the open water. No method described until now fits for all that conditions properly. 2. Using a newly developed trapping-method 7100 specimen of water birds including 2580 Gadwalls (Anas strepera) were captured from 1978 to 1985. 3. The system consists of 11 traps mounted on wooden frames and fixed to the bottom in a way, that allows moving with the change of the water level. Traps are connected by nets, that guide the birds into funnel-shaped entrances. The basic construction of the traps is similar to the system used at Ottenby, Sweden, for catching waders. 4. Construction of floating frame and trap as well as mooring-technique is presented together with notes on material and construction measurements, showing the basic attributes of the "Ismaning floating trap". 5. Average depth of water at the trap-site is 80 (20-120) cm. The line of traps blocks the access to a bay, which is visited in westwind-weather with rain or at night for feeding. During daytime birds enter the traps but scarcely. 6. Traps are controlled before noon. Birds can be taken out by hand, no netting is necessary. As traps are not baited, only short time is required. There is no lasting disturbance of the ducks caused by this trapping system.

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