Breeding distribution and numbers of wren (Troglodytes troglodytes) in the Faroe Islands: Útbreiðsla og tal av Músabróður {Troglodytes troglodytes) í Føroyum

Abstract

The sedentary, endemic subspecies, of wren (Troglodytes t. borealis) is common and widespread all over the Faroe Islands. The total breeding population was estimated, on the basis of field-data collected during the past 20 years, as being between about 600 and 850 pairs, and probably more. About 28% are found at settlements and on cultivated land surrounding them (infields), 49% in the outfield areas (mostly near the shores), and 23% on sea cliffs. Few pairs are to be found in plantations. Small islands have relative many breeding pairs; possible reasons (e.g. presence of seabird colonies, cats, stone walls etc.) are discussed. Annual fluctuations in the order of 15-30% occur but no long-term significant changes in numbers are discernible, though a possible shift from breeding at settlements to outfield areas and sea cliffs is suggested.