Trädgårdssångarens Sylvia borin beteende under rastning i Obudu, sydöstra Nigeria

Författare

  • Soladoye B Iwajomo A. P. Leventis Ornithological Research Institute & Ottenby Bird observatory
  • Ulf Ottosson A.P. Leventis Ornithological Research Institute & Ottenby Bird observatory
  • Yahkat Barshep A.P. Leventis Ornithological Research Institute & University of Cape Town
  • Anders Helseth Ottenby fågelstation
  • Mark F Hulme A. P. Leventis Ornithological Research Institute & Section for Zoonotic Ecology and Epidemiology, Linnaeus University
  • Matthew Stevens A. P. Leventis Ornithological Research Institute & University of St Andrews
  • Jonas Waldenström Zoonotisk Ekologi och Epidemiologi, Linnéuniversitet & Ottenby fågelstation

DOI:

https://doi.org/10.34080/os.v21.22608

Nyckelord:

migration, ruggning, inomartsvariation, fettupplagring, flyttningsfenologi, flyttning

Abstract

The Garden Warbler breeds in the Palaearctic and migrates to sub-Saharan Africa for the non-breeding season. We studied its passage, body mass and moult at the Obudu Plateau in southeast Nigeria in October–December 2005 and December 2007–January 2008. In Nigeria, Garden Warblers in the Guinea savanna have been shown to increase body mass in October–November, preparing for migration to wintering sites further south. They begin to arrive at Obudu from mid-October and the numbers gradually increase with time; median date of passage was 3 December. This influx is clearly different from that which has been recorded for other sites in West Africa. The patterns in wing length and size-corrected body mass of individuals suggest a difference in the migration time of individuals of different sizes in the two years. Average fuel loads were lower at Obudu than has been reported in Central Nigeria. This, and the capture of moulting individuals, suggests that Garden Warblers may not embark on a longer journey southwards in mid winter, and possibly may even winter at Obudu.

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Publicerad

2011-01-01

Referera så här

Iwajomo, S. B., Ottosson, U., Barshep, Y., Helseth, A., Hulme, M. F., Stevens, M., & Waldenström, J. (2011). Trädgårdssångarens Sylvia borin beteende under rastning i Obudu, sydöstra Nigeria. Ornis Svecica, 21(1), 29–36. https://doi.org/10.34080/os.v21.22608

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