Title variants
White stork (Ciconia ciconia) in the Łowicz District
Languages of publication
Abstracts
Having analysed materials collected in the Łowicz District in 1968 1970, 1974,
1975, 1983 and 1984 the author proved the occurrence of a continuous increase in the
number of nests which were not occupied by pairs and nests which had no breeding
success. Since 1970 the total number of nestlings which left their nests has also been on
the decrease. Between 1970 and 1975 the density of pairs calculated for 100 km2
increased from 11.37 to 14.00 and then decreased to 10.39 in 1984. Positive changes in
density were preceded by a high efficiency of breeding, while negative ones by a low
efficiency. Since 1970 an increase in the number of nests built on the poles of electric
traction has been observed. The author has proved that in places where groupings of
nests (HP) consisted of more than 5 ones and when the distances between nearest ones
did not exceed 1.5 km, intraspecific competition was the most significant factor limiting
the efficiency of breeding.
1975, 1983 and 1984 the author proved the occurrence of a continuous increase in the
number of nests which were not occupied by pairs and nests which had no breeding
success. Since 1970 the total number of nestlings which left their nests has also been on
the decrease. Between 1970 and 1975 the density of pairs calculated for 100 km2
increased from 11.37 to 14.00 and then decreased to 10.39 in 1984. Positive changes in
density were preceded by a high efficiency of breeding, while negative ones by a low
efficiency. Since 1970 an increase in the number of nests built on the poles of electric
traction has been observed. The author has proved that in places where groupings of
nests (HP) consisted of more than 5 ones and when the distances between nearest ones
did not exceed 1.5 km, intraspecific competition was the most significant factor limiting
the efficiency of breeding.
Keywords
Publisher
Year
Volume
Physical description
Dates
published
1992
Contributors
References
Document Type
Publication order reference
Identifiers
URI
http://hdl.handle.net/11089/13078
YADDA identifier
bwmeta1.element.hdl_11089_13078
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