uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Behaviour and life-history responses to chick provisioning under risk of nest predation
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology, Population Biology.
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis examines risk management in breeding Siberian jays (Perisoreus infaustus), which is indigenous to the northern taiga. Parent behaviour and the nest are cryptic. A new nest is built each year. It is placed on spruce or pine branches close to the trunk and well insulated with lichens, feathers and reindeer hair.

Nest failure rate was the main factor driving annual variations in jay numbers. The probability for nesting attempts to be successful ranged annually between 0.08 and 0.70. Nest predation was rampant and a main cause of nest failure. Nest predators were mainly other corvids (primarily the Eurasian jay Garrulus glandarius). Habitat quality was the main factor determining the risk of predation. The risk for nest failure due to predation was higher in thinned forests with an open structure and with a high abundance of man-associated corvid species (jays, crows, raven).

Siberian jay parents show several strategic adjustments in life-history and behaviour to the risk of nest predation. Parents traded reduced feeding rates for a lower predation risk and allocated feeding to low risk situations. Chick provisioning imposes a cost by drawing the attention of visually hunting predators to the location of nests, and parents adjusted their daily routines and avoided exposure by allocating provisioning to times of low activity among nest predators. These strategic adjustments of feeding efforts were estimated to reduce the exposure to nest predators by 26 percent. Also, parents adjusted their reproductive efforts to the perceived presence of predators in a playback experiment. Siberian jays reduced their reproductive investment by laying a smaller clutch size when high risk of nest predation reduced the value of current reproduction, as predicted from life-history theory.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2002. , p. 37
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 773
Keywords [en]
Biology, Chick provisioning, clutch size, delayed dispersal, nest concealment, nest predation, parental care, population decline, Perisoreus infaustus, Siberian jay
Keywords [sv]
Biologi
National Category
Biological Sciences
Research subject
Population Biology
Identifiers
URN: urn:nbn:se:uu:diva-3077ISBN: 91-554-5463-1 (print)OAI: oai:DiVA.org:uu-3077DiVA, id: diva2:162214
Public defence
2002-12-13, Zootissalen, Evolutionary Biology Centre (EBC), Uppsala, 10:00
Opponent
Available from: 2002-11-21 Created: 2002-11-21Bibliographically approved

Open Access in DiVA

fulltext(1191 kB)1866 downloads
File information
File name FULLTEXT01.pdfFile size 1191 kBChecksum MD5
f79c0c2a9c8127f128e16a6e887ef7e144bccad080a86dfa0389d8cd4103d9c85a50f254
Type fulltextMimetype application/pdf
Buy this publication >>

By organisation
Population Biology
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 1866 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1939 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf