Fróðskaparrit - 01.01.2009, Blaðsíða 184

Ringing recoveries of house sparrow
(Passer domesticus) in the Faroe Islands
during the years 1963-2007
Ringmerkingar av føroyskum gráspurvum (Passer
domesticus) árini 1963-2007
Eyðfmn Magnussen1 and Jens-Kjeld Jensen2
1 University of the Faroes, Faculty of Science and Technology. Nóatún 3, FO-100 Tórshavn, Faroe Islands. Email:
EydfinnM@Setur.fo
2 í Geilini 37, FO-270 Nólsoy, Faroe Islands. Email: jkjensen@post.olivant.fo
Úrtak
Gráspurvurin (Passer domesticus) má metast at vera
ein tann støðufastasti búfuglurin í Føroyum. Siðan
1963 eru tilsamans 2.167 gráspurvar ringmerktir í 12
ymiskum føroyskum bygdum, spjaddar kring landið.
17% vórðu merkt í reiðrinum, 39% vóru ungfuglar og
39% vaksnir fuglar. 22S (10%) av teimum merktu
gráspurvunum vórðu fingnir ella sæddir aftur; allir í
Føroyum, og einans tveir í aðrari bygd enn henni, har
teir upprunaliga vórðu merktir. Helvtin av fráboð-
anunum komu tær fyrstu 8 vikurnar eftir merkingina,
25% fyrstu 3 vikurnar. í flestum førum (68%) doyðu
fuglarnir av ókendum ávum, men har deyðaatvoldin
var kend, var ketta vanligasta atvoldin. Miðallívstíðin
hjá føroyska gráspurvinum er 1,3 ár. Flelvtin av
spurvunum, sum vórðu merktir í reiðrinum ella sum
ungfuglar, doyðu eftir 4,1 mánaðum. Tann elsti
gráspurvurin, vit vita um í Føroyum, varð fingin aftur
næstan tíggju ár eftir, at hann varð merktur í reiðrinum.
Abstract
The house sparrow (Passer domesticus) is one of the
most sedentary species of wild birds in the Faroe
Islands. Since 1963, 2,167 house sparrows (17%
nestlings, 39% juveniles and 39% adults) have been
ringed at 12 places, scattered over the Faroe Islands.
225 (10%) have been recovered, dead or resighted/
recaptured, all within the Faroe Islands, and only two
outside the villages where they were ringed. Half of the
recoveries were reported within 8 weeks, 25% already
within 3 weeks. In most cases (68%), the cause of death
was unknown. However, "killed by cat” was the most
common known cause. The median life-span for the
Faroese house sparrows is 4.1 months, and average age
at death is 1.3 years. The oldest house sparrow
recorded in the Faroe Islands was found dead almost
ten years after it was ringed as nestling.
Fróðskaparrit 57. bók 2009:182-189