NDLI: Food or nesting place? Identifying factors limiting Wryneck populations

Content Provider	Springer Nature Link
Author	Coudrain, Valérie Arlettaz, Raphaël Schaub, Michael
Copyright Year	2010
Abstract	In recent decades, farmland bird populations have declined strongly as a consequence of agriculture intensification. Birds may have lost breeding sites, food supply or other crucial resources, with the role of multiple factors often remaining unclear. The ant-eating and cavity-breeding Wryneck (Jynx torquilla) may be limited by the availability of cavities, the number of ants or their accessibility. By comparing occupied and unoccupied breeding territories, we investigated the relative role of these factors in the decline of Wrynecks. We compared the characteristics of known Wryneck breeding territories (availability of breeding cavities, food abundance and ground vegetation structure) with randomly selected, fictitious territories (n = 154) in Western Switzerland. We also studied environmental factors that may affect ant nest density. The probability of territory occupancy strongly increased with both nestbox availability and ant abundance. In addition, this probability peaked around 50% of bare ground cover. Habitat types that harbour low ant abundance such as cropland and grassland were avoided. Ant nest density decreased with increasing amounts of bare ground, and it was particularly high in vineyards. Our results showed that breeding cavities, food availability and its accessibility all limit Wryneck distribution. The maintenance and restoration of ant rich grassland, interspersed with patches of bare ground and with hollow trees or dedicated nestboxes in the surroundings, are essential to preserve Wryneck populations. Such a habitat structure could be achieved even in intensively farmed habitats, such as in vineyards or fruit tree plantations.
Starting Page	867
Ending Page	880
Page Count	14
File Format	PDF
ISSN	00218375
Journal	Journal für Ornithologie
Volume Number	151
Issue Number	4
e-ISSN	14390361
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-04-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ant nest abundance Nest box Vegetation structure Bare ground Jynx torquilla Evolutionary Biology Animal Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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