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In 1996-2002, 227 breeding attempts were studied in a colour-ringed Sedge Warbler population. Although 11% of males in this population resumed singing in order to mate with another female after their first females had laid eggs, only two polygynous males (i.e. 0.6%) were recorded. This is a very low value in comparison to other studies (ca. 7% on average). The low level of polygyny is attributable to the low food abundance in a natural floodplain, as the nestlings in this population were fed on predominantly small food items. Both polygynous males were recorded in 2002; this year was unusual, because flooding in early June (around the hatching date) destroyed most of the broods. This could have led to an influx of new females into the study area, a change in the operational sex ratio, and new mating opportunities for males.
The foraging behavior of Reed Warbler (Acrocephalus scirpaceus), Sedge Warbler (A. schoenobaenus) and Marsh Warbler (A. palustris) was surveyed on three crop types (spring cereals, winter cereals and oil seed rape) in western Poland. The foraging intensity was greatest in oil seed rape, while the lowest was in spring cereals. For Sedge Warbler, oil seed rape fields were visited mainly in May, while cereal fields were visited in June and July. The number of foraging visits decreased with increasing distance from a breeding marsh patch. There was no difference in distance traveled to different crop types. There was a significant negative correlation between marsh patch area and foraging intensity for all species combined. This study shows that oil seed rape may be useful as a foraging habitats for some farmland birds during the breeding season.
New species, Hepatozoon kabeeni was described in' blood of Sedge Warbler Acrocephalus schoenobaenus. The parasite species was detected in two populations of Sedge Warbier in NE and SW parts of Poland. Hepatozoon kabeeni was found respectively in 36.0% (n=25) and 28.6% (n=28) of individuals.
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