The Wetland Book pp 1089-1097 | Cite as

The Inner Danish Waters and Their Importance to Waterbirds

Reference work entry

Abstract

The inner Danish waters comprise an area of 50,000 km2. The area is very important to a range of species of waterbirds breeding further north in Scandinavia or further northeast in Russia and Siberia as the inner Danish waters are ice-free in most winters. The shallow nearshore areas are important to mute swan, Eurasian coot while the near-shore, slightly deeper areas are important to a range of seaducks most importantly common eider and common scoter. Open sea areas are important to red-throated and black-throated diver and several species of alcids. The largest number of waterbirds are present during migration and winter but some species also molt in the area during late summer. During migration dabbling ducks and geese are present in their thousands in coastal areas. Harbor seal and harbor porpoise are the most numerous marine mammals occurring in the area. Climate change might be affecting the distribution of waterbirds with several species showing an increase in numbers in the northeastern part of their wintering range with e.g. increasing numbers of wintering smew in the inner Danish waters.

Surveys of waterbirds have been conducted in Denmark since the 1960s, when the aerial survey method was introduced. For many years the total count method was used, but since 2000 the line transect sampling method, allowing for fine scale estimation of densities, has been used intensively.

Keywords

Waterbirds Wetlands Monitoring Line transect Sampling method Molt 

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of BioscienceAarhus UniversityKaløDenmark

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