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Antczak, Marcin ; Hromada Martin ; Grzybek Jerzy ; Tryjanowski Piotr ; Polska Akademia Nauk. Muzeum i Instytut Zoologii
Acta Ornithologica, vol. 39, no. 1 ; Biologia rozrodu srokosza w zachodniej Polsce ; Great grey shrike biology
Museum and Institute of Zoology, Polish Academy of Sciences
Bibliogr. s. 13-14 ; S. [9]-14 : il. ; 27 cm ; Streszcz. pol. Nazwy taksonów także w jęz. łac.
A Great Grey Shrike population was studied in two large plots (220 km2 and 176 km2) in western Poland in 1999 - 2003. During the study period densities varied from 11.4 to 14.1 breeding pairs/100 km2 but numbers were stable. In all, 180 Great Grey Shrike nests were found - 114 (63.3%) in conifers, 66 (36.7%) in deciduous trees. This populations reproductive parameters were relatively high in comparison to those of other European populations: mean clutch size - 6.6, hatching success - 92.5%, mean brood size - 5.72, mean number of fledglings per pair - 4.1, mean number of fledged young per successful pair - 5.25. Eggs (mean 27.1 x 19.9 mm) were found to be larger than reported in the literature. Nesting success was similar in both study plots, but there was slight seasonal variability: 52.6% - 41.0% from 99 nesting attempts in the first plot, 43.7% - 42.1% from 37 nests in the second. Predation was the main cause of nest losses. Plastic string used as nesting material appeared to be the most important cause of partial failures: 13 (8.2%) of a total of 147 nestlings surviving to fledging perished as a result of becoming tangled up in it. Nestlings rarely starved. Nests in linear habitats suffered significantly higher breeding losses (78.6%, N = 28) than those in non-linear habitats (50%, N = 90). The high fitness values obtained from this population were probably due to traditional farming practices, the sparing use of pesticides and the good potential food base.
oai:rcin.org.pl:54203 ; kliknij tutaj, żeby przejść
MiIZ PAN, sygn. patrz sygn. czas. P.257-39-1 ; MiIZ PAN, sygn. patrz sygn. czas. P.4568-39-1 ; kliknij tutaj, żeby przejść
Prawa zastrzeżone - dostęp nieograniczony
Muzeum i Instytut Zoologii Polskiej Akademii Nauk
Biblioteka Muzeum i Instytutu Zoologii PAN
2 paź 2020
10 cze 2015
60
https://rcin.org.pl./publication/74020
Tryjanowski, Piotr Hromada, Martin (1969– ) Antczak, Marcin
Tryjanowski, Piotr
Tryjanowski, Piotr Yosef, Reuven
Osiejuk, Tomasz S Grzybek, Jerzy Tryjanowski, Piotr
Malizia, A. I. Bush, C.
Kuźniak, Stanisław (1933– ) Bednorz, Jan ( –2013) Tryjanowski, Piotr