SEARCH

SEARCH BY CITATION

SUMMARY

  • 1
    A new race of wren, Troglodytes t. fridariensis, is described from Fair Isle in North Britain.
  • 2
    The plumage of the upper parts of the wrens in the north-east Atlantic area shows three lines of divergence from the typical race: (a) hebridensis-setlandicus, (b) fridariensis-hirtensis, and (c) borealis-islandicus.
  • 3
    The tendency of the Fair Isle stock towards the greyer mantle plumage of St. Kilda birds may be due to similar environmental conditions, or to “Sewell-Wright effect” in small, isolated communities.
  • 4
    The importance of the 25-mile sea-barrier separating Shetland from Fair Isle wrens is emphasized.