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Påverkar ålder och kön mönster i vårmigration hos snösparv (Plectrophenax nivalis)?
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In many bird species protandry is a common pattern during their spring migration, allegedly this pattern is also present for the passerine species snow buntings (Plectrophenax nivalis). During their spring migration males tends to arrive 3-4 weeks before the arrival of females at the breeding grounds. In this study I have examined if this pattern is reflected in their spring migration as well if there is a differential timing between the age classes for males. I also examined if there is a connection between wingspan and arrival time at Umeå delta for each sex and between the sexes. To make this study possible I captured and banded snow buntings during spring at Umedeltat field station and combined my data with 2012’s data of banded snow buntings from the same station. There was a significant difference in mean capture dates between males and females, with males arriving 1.6 days earlier. There was also a significant difference in mean capture dates between older and younger males, older males arriving 2.7 days earlier. When I examined the wingspan for the sexes I looked at it for each year. During 2017 there was a trend for females that those with longer wingspan arrived earlier than females with shorter wingspan. During 2012 there was a significant correlation; females with longer wingspan arrived earlier than those females with shorter wingspan. There was no correlation between males each year. I also found that in 2017 the mean captures dates for males was later than in 2012. In contrast mean capture dates for females was earlier 2017 than in 2012. My data strongly indicate that protandry is present in snow buntings as well as wingspan may have greater importance for females during their migration than males.

Place, publisher, year, edition, pages
2017. , 14 p.
Keyword [en]
Snow bunting, spring migration, differential timing age and sex, banding, plectrophenax nivalis
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-136144OAI: oai:DiVA.org:umu-136144DiVA: diva2:1109308
Educational program
University Programme in Nature Guiding
Presentation
2017-06-07, 09:46 (Swedish)
Examiners
Available from: 2017-06-15 Created: 2017-06-13 Last updated: 2017-06-15Bibliographically approved

Open Access in DiVA

fulltext(640 kB)15 downloads
File information
File name FULLTEXT01.pdfFile size 640 kBChecksum SHA-512
1dddbf95cb8e16131842b711960e2cf432ce913feaed03ac98662c7b2bb1e4deb528b6c550e0c8693041b714c07be1e27718898a8e9547395d72bd99248df292
Type fulltextMimetype application/pdf

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Department of Ecology and Environmental Sciences
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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