hkr.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • 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
Breeding success of boreal mallard and wigeon in relation to population density and food resources
Finland.
Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
Finland.
SLU, Umeå.
2003 (English)In: Third North American duck symposium: waterfowl management and biology in the 21st century: looking back and to the future, 2003, 79- p.Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Breeding success of mallard and wigeon was studied for 12 years in a boreal lake area in southern Finland. Aquatic and surface-emerging prey were trapped to obtain annual indices of food abundance. The average density of mallards was 0.42 pairs per 1000 m shore line and that of wigeon 0.18. The mean brood production per pair was 0.24 in mallard and 0.41 in wigeon. We correlated brood:pair and duckling:pair ratios to pair density and per capita food availability to test whether per capita breeding success decreases in a density-dependent way when pair density or the number of nesting pairs per available food unit increases. No density-dependent pattern was found in mallards. In wigeon, in contrast, we found two independent patterns of density dependence. Per capita brood production correlated negatively with pair density, and brood:pair and especially duckling:pair ratio correlated negatively with per capita abundance of surfaceemerging prey.

Place, publisher, year, edition, pages
2003. 79- p.
National Category
Zoology
Identifiers
URN: urn:nbn:se:hkr:diva-16040OAI: oai:DiVA.org:hkr-16040DiVA: diva2:971533
Conference
Third North American duck symposium, Sacramento, California, 2003
Available from: 2016-09-16 Created: 2016-09-16 Last updated: 2016-09-16Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Elmberg, Johan
By organisation
Avdelningen för Naturvetenskap
Zoology

Search outside of DiVA

GoogleGoogle Scholar

Total: 1 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • 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