1.01 Kuczynski, L., Rz?pala, M., Golawski, A. & Tryjanowski, P. (2009)

"As a general rule, wintering shrikes avoid regions with severe, continental climate and prefer lowlands."

Qualifizierung der Quelle: A

1.02 Gorban, I. (2000)

In einer polnischen Studie wurde Wind als klimarelevanter Faktor für den Raubwürger angesehen. "In the Lviv region, wind direction had strong influence on the selection of feeding and hunting sites."

Qualifizierung der Quelle: A

1.03 Yosef, R. (1994)

"Low temperatures (< 17 °C) combined with heavy or persistent rains reduce drastically the survival of young shrikes and limit food availability for adults (Lefranc 1993)."

Qualifizierung der Quelle: D

1.04 Gorban, I. (2000)

"Clear correlation between wintering of the Great Grey Shrike, climate factors and landscape structure. The most important limiting factors appear to be precipitation and snow cover."

Qualifizierung der Quelle: A

1.05 Kuczynski, L., Antczak, M., Czechowski, P., Grzybek, J., Jerzak, L., Zablocki, P. & Tryjanowski, P. (2010)

"Increased winter temperatures might have had a positive effect on survival of birds from the breeding population since severe winters, especially periods with prolonged snow cover, may be the most important cause of mortality (Kowalski 1985, Lefranc & Worflock 1997)."

Qualifizierung der Quelle: A