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Drivers of population change in common farmland birds in Germany

Published online by Cambridge University Press:  14 January 2020

MALTE BUSCH Open the ORCID record for MALTE BUSCH [Opens in a new window] ,
JAKOB KATZENBERGER ,
SVEN TRAUTMANN ,
BETTINA GERLACH ,
RAINER DRÖSCHMEISTER  and
CHRISTOPH SUDFELDT
MALTE BUSCH*
Affiliation:
Federation of German Avifaunists (DDA e.V.), An den Speichern 6, 48157 Münster, Germany.
JAKOB KATZENBERGER
Affiliation:
Federation of German Avifaunists (DDA e.V.), An den Speichern 6, 48157 Münster, Germany.
SVEN TRAUTMANN
Affiliation:
Federation of German Avifaunists (DDA e.V.), An den Speichern 6, 48157 Münster, Germany.
BETTINA GERLACH
Affiliation:
Federation of German Avifaunists (DDA e.V.), An den Speichern 6, 48157 Münster, Germany.
RAINER DRÖSCHMEISTER
Affiliation:
Federal Agency for Nature Conservation, Konstantinstrasse 110, 53179 Bonn, Germany.
CHRISTOPH SUDFELDT
Affiliation:
Federation of German Avifaunists (DDA e.V.), An den Speichern 6, 48157 Münster, Germany.
*
*Author for correspondence; email: busch@dda-web.de
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Summary

Farmland bird populations in Germany are declining at a higher speed than species inhabiting other habitats. We studied potential causes for bird population changes based on data from standardised German breeding bird monitoring schemes. We related population trends to covariates describing the changes in the agricultural landscape in Germany, weather conditions during the breeding season and for some migratory species, conditions at stopover and wintering sites. Linear mixed effect models were used to analyse effect strength at species level and conclusions are drawn for the overall group of farmland bird species. The area of grassland and fallow land was shown to have the strongest positive effects and the area of maize and rapeseed the strongest negative effects on farmland bird population trends. The results obtained also indicate that despite the consistent influence of weather conditions during the breeding season, land-use changes had a stronger impact on bird populations than weather. Conditions at Sahel wintering sites did not show a consistent effect on population trends. Based on these findings the study quantitatively underpins and ranks key factors shaping farmland bird populations in Germany.

Keywords

ornithologybreeding birdspopulation trendsagricultural intensificationland-use change
Type
Research Article
Information
Bird Conservation International , Volume 30 , Issue 3 , September 2020 , pp. 335 - 354
Copyright
© BirdLife International, 2020

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