LONG-TERM CHANGES OF BREEDING PARAMETERS OF NUTHATCHES SITTA-EUROPAEAIN 2 STUDY AREAS OF NORTHERN GERMANY

Authors
Citation
W. Winkel et H. Hudde, LONG-TERM CHANGES OF BREEDING PARAMETERS OF NUTHATCHES SITTA-EUROPAEAIN 2 STUDY AREAS OF NORTHERN GERMANY, Journal fur Ornithologie, 137(2), 1996, pp. 193-202
Citations number
22
Language
TEDESCO
art.tipo
Article
Categorie Soggetti
Ornithology
Journal title
ISSN journal
0021-8375
Volume
137
Issue
2
Year of publication
1996
Pages
193 - 202
Database
ISI
SICI code
0021-8375(1996)137:2<193:LCOBPO>2.0.ZU;2-B
Abstract
Between 1970 and 1995, nestbox data about clutch size, hatching date a nd fledging success were collected for a total of around 1500 first br oods of Nuthatches in two north German study areas (near Brunswick 52. 16 N 10.32 E and near Essen 51.24 N 6.59 E). The average clutch size w as 6.8 eggs (Brunswick), the average hatching date 9 May (Brunswick) a nd 6 May (Essen), and the mean number of fledglings per successful bro od 5.6 (Brunswick) and 5.2 (Essen). Over time hatching dates significa ntly advanced in both areas. Data of further years are needed to clari fy if the recent unusual sequence of early breeding years in the Nutha tch is already a consequence of the anthropogenic ''greenhouse effect' ' or just due to normal variation of weather conditions.