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Factors affecting the local distribution of the Long-tailed Duck Clangula hyemalis in Baltic offshore waters

Author:
  • Leif Nilsson
  • Martin Ogonowski
  • Thomas A.B. Staveley
Publishing year: 2016
Language: English
Pages: 142-158
Publication/Series: Wildfowl
Volume: 66
Document type: Journal article
Publisher: Wildfowl and Wetlands Trust

Abstract english

The Long-tailed Duck Clangula hyemalis is the main offshore wintering seaduck
species in the Baltic region, although numbers have declined steeply since the early 1990s. The reasons for the decline are not well understood and information about habitat choice is scarce. Blue Mussels Mytilus edulis are the main food source for Longtailed Ducks in the southern Baltic Sea and here we have used both modelled and measured raw data on Mytilus abundances, patchiness and various bathymetric parameters to study Long-tailed Duck habitat preferences. Long-tailed Ducks were most abundant at depths of 10–30 m and in areas of high Mytilus densities. Patchiness of the resource was also very influential, especially when overall Mytilus densities were low. Bird abundance was intermediate to high in areas of low patchiness and low
where Mytilus patchiness was high. This suggests that the birds seek areas that
optimise their feeding efficiency.

Keywords

  • Ecology

Other

Published
Leif Nilsson
E-mail: leif [dot] nilsson [at] biol [dot] lu [dot] se

Professor emeritus

Biodiversity

+46 46 222 37 09

+46 70 525 57 09

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden