SEEN - SE European Bird Migration Network
Effect of nasal saddles on breeding performance of diving ducks

Petr Musil, Michaela Nachtigalová, Tomáš Albrecht, Magda Brožová,
David Hořák, Petr Klvaňa, Zuzana Musilová

Department of Zoology, Faculty of Science, Charles University, Czech Republic

In total, 133 females of European Pochard (Aythya ferina) and 85 females of Tufted Duck (Aythya fuligula) were marked during 1998–2005 in southern Bohemia (the Třeboň Biosphere Reserve and adjacent areas, 49°00’N 14°46’E), Czech Republic. The project in based on catching, measuring, weighing and colour marking (nasal saddles or nasal discs) of diving duck females. Advantages and disadvantages of various types of nasal saddles will be discussed in the presentation.
Females were caught on the nest using a drop-door trap or flushed into mist nets exposed close to the nest. Both catching methods are used only during the late phase of incubation to prevent nest abandonment. Evaluation of possible effects of colour marking on patterns in individual behaviour and reproductive performance (nest success, duckling survival) will be included in the presentation.
The main goal of the Czech diving duck catching project is to investigate movements and survival of individual diving duck broods and its relation to: female quality and weather and feeding conditions (i.e., fish stock density, density and composition of benthos and plankton, water transparency) on the nest site and in its surroundings.
More detailed information is available at http://www.mujweb.cz/veda/aythya/.

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