Zur Verbreitung und Entwicklung einiger hoehlenbruetender Singvoegel in Ostbayern.
1993
Baeumler W.
The occurrence of Jynx torquilla, Certhia familiaris, C. brachydactyla, Phoenicurus phoenicurus, Ficedula hypoleuca and Sitta europaea in the eastern parts of Bavaria was investigated according to records of contents in nesting boxes from 1959-1990. The number of boxes checked each year rose from 560 in the year 1950 up to 13000 in 1985 (Abb.2). The distribution of the species during the last decade from 1981-1990 is mapped (Abb.1 and 3). The percentage of the boxes used by the nuthatch increased steadily by 0.3% per year since the begin of the observations. The flycatcher and the wryneck increased until 1976 and declined later. The tree creepers and the redstart decreased during the observed period of 41 years.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Wolters Kluwer