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Age at First Return and Breeding of Razorbills (Alca torda) on the Gannet Islands, Labrador and Machias Sea Island, New Brunswick


Lavers, JL and Jones, IL and Diamond, AW, Age at First Return and Breeding of Razorbills (Alca torda) on the Gannet Islands, Labrador and Machias Sea Island, New Brunswick, Waterbirds, 31, (1) pp. 30-34. ISSN 1524-4695 (2008) [Refereed Article]

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Copyright 2008 Waterbird Society

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DOI: doi:10.1675/1524-4695(2008)31[30:AAFRAB]2.0.CO;2


Resightings of Razorbills ( Alca torda ) banded as chicks on the Gannet Islands, Labrador (N = 1,873 resightings of 638 individuals) and Machias Seal Island, New Brunswick (N = 870 resightings of 291 individuals) were used to estimate the timing and age at first return to the natal colony and age at first breeding. In total, 14 one-year-old and 110 two-year-old birds were observed on land. All one- and two-year-old birds were seen for the first time on the islands late in the breeding season after laying had occurred, with two-year-olds returning to the colony on average three weeks earlier than one-year-old birds. Age at first breeding was significantly lower on Machias Seal Island than the Gannet Islands, 3.88 ± 0.13 SE and 4.40 ± 0.13 SE years, respectively (range two to six years, N = 123). Four two-year-old birds were observed engaging in courtship and breeding behaviors, including copulation. Overall, age at first return and breeding was lower than for known European Razorbill colonies and is likely due to low breeding densities and fidelity at the two North American colonies studied. Received 27 February 2007, accepted 09 October 2007.

Item Details

Item Type:Refereed Article
Keywords:Age at first breeding, Alca torda, Razorbill, recruitment.
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Ecology not elsewhere classified
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Lavers, JL (Dr Jennifer Lavers)
ID Code:78333
Year Published:2008
Web of Science® Times Cited:2
Deposited By:IMAS Research and Education Centre
Deposited On:2012-06-22
Last Modified:2012-06-26

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