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1

Winter mortality rates of bats inhabiting man-made shelters [Northern Poland]

100%
Ruczynski I., Ruczynska I., Kasprzyk K.
Acta Theriologica
|
2005
|
tom 50
|
nr 2
Non-predator and non-accidental mortality rates of bats inside the city of Toruń's fortification system (northern Poland) were studied over winter periods from 1995 to 2000. The bats were counted and dead bats collected at 1-month intervals from October to April. In total, thirty four dead bats were found. The percentage of dead individuals of the surveyed bats was low:Myotis daubentonii (0.6%),M. nattereri (0.4%),Plecotus auritus (0.4%),M. myotis (0.1%), and zero forBarbastella barbastellus. There was no clear difference in the species ratio of the observed and dead bats. The percentage of the dead to surveyed bats was lower in November (0.07%) and December (0.07%), and higher in September (3.3%) and April (1.3%). Temperature explained 84% of variation of the differences in mortality rates. Observations suggest that non-predator and non-accidental mortality inside the fortifications was extremely low and non-linearly correlated with the ambient temperature measured outside the fortifications.
2

Bird casualties on European roads - a review

100%
Erritzoe J., Mazgajski T. D., Rejt L.
Acta Ornithologica
|
2003
|
tom 38
|
nr 2
Road traffic affects the natural environment in numerous ways. The most striking of these is the death of wild animals and birds as a result of collisions with moving vehicles. In this paper the available data on bird mortality on roads are reviewed. Estimates of annual mortality for some European countries (350 000 to 27 million birds), the monthly distribution of casualties, their distribution among sex and age classes, as well as the methods used in the study of this problem are presented. The species composition of birds killed in this way is compared for several countries. In western Europe sparrows and Blackbirds are the species that most frequently die on the roads, but in Central and Eastern Europe not only sparrows but also corvids and Barn Swallows make up a high proportion of the victims. Analysis of the monthly distribution of casualties in 10 species shows this to differ between countries, probably because of the geographic variation of certain aspects of their biology (migration, breeding etc.). Several factors affecting the frequency of casualties are discussed, and some suggestions for the prevention of bird casualties are also given.
3

Mijają lata, zostaje pamięć...

80%
Baranowska M.
Araby
|
2010
|
tom 04
|
nr 3(19)
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