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The study diagnosed the first case of sarcocystosis in a mallard duck and drake in Poland. Both birds were lean and their anatomopathologic examination indicated a large number of rod-shaped sarcocysts in the pectoral muscles and esophagus. The sarcocysts were similar in shape and size to a grain of rice. Fat degeneration, enlargement and rupture of parasitized muscle fibers were diagnosed following histopathology examination of muscle pieces.
During the summer heat wave of July 2004, a large number of mallard ducks (Anas platyrhynchos) were found dead in Skaryszewski Park in Warsaw. Simultaneously, in the parks lake a massive wave of dead fish were discovered. Gram negative oxydase positive rods were isolated from the following organs of the dead ducks: kidneys, liver, pancreas and intestine, as well as in a pure culture. These bacteria caused a strong haemolyis on blood agar plates. Using API, NE test isolates were identified as Aeromonas hydrophila. The tested strain was proven susceptible, among others, to neomycine, streptomycine, gentamycine, tetracycline, flumequine, and norfloxacine, but resistant to amoxycillne, amoxycillin and clavulanic acid as well as to polimyxin.
Acta Ornithologica
|
1995
|
tom 30
|
nr 2
125-136
Habitat use, feeding, diet composition, changes in body mass and interior indices, time budget, sex ratio and mortality of Mallards wintering in Belarus were investigated in 1980-1992. Counts and individual tagging allowed to reveal in wintering Mallards several functional groups, which use of wintering area was independent. The estimated number of Mallards in every wintering ground depended on food abundance in unfrozen feeding water bodies. The main food of 80% of Mallards wintering in Minsk city district was active silt from sewage plant. 80-90% of Mallards wintering in Lukomlskoe Lake (rural area) fed on Zebra Mussels Dreissena polymorpha. Body mass of Mallards studied increased from October till December and decreased from January till the middle of March (24% in females and 23% in males), and could have negative impact on reproductive success of sedentary Mallards. Time expenditure on flights and swimming decreased and foraging time increased from December till March. Mortality rate fluctuated between 1 and 6% in different winters.
In total, 240 nest boxes for water birds were assessed during 2006 − 2010 at six localities in South Bohemia region (Czech Republic). Occupancy and nest effect rate of the boxes was monitored. Subsequently there was analysed relation between the box occupancy and potential factors affecting this quantity
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