Barrow's Goldeneye
territories

 

In spring the Barrow's Goldeneye males defend territories on open water,
where they spend most of their time during the nesting season.
The boundaries are like invisible lines on the water surface
and are defended by aggressive displays and direct attacks, sometimes under water.
Offshore territories (i.e. not touching the shore) are smaller
because they are less defendable and usually they are abandoned early.

Nonterritorial birds stay in flocks at the edge of the breeding area.
The figure shows the situation in a small bay along the eastern shore of Mývatn.


REFERENCES

Árni Einarsson 1985. Use of space in relation to food in Icelandic Barrow's goldeneye (Bucephala islandica).  Ph.D. thesis, University of Aberdeen, Scotland.

Árni Einarsson 1985. Dreifing húsanda með tilliti til fæðu. Bliki 4: 67-69.

Árni Einarsson 1990. Settlement into breeding habitats by Barrow's Goldeneyes Bucephala islandica: Evidence for temporary oversaturation of preferred habitat. Ornis Scand. 21: 7-16.