We recorded B. garinii from Gannet Islands, Labrador and Gull Island, Newfoundland, Canada, in Atlantic Puffins (Fratercula arctica), Herring Gulls (Larus argentatus), Common Murres (Uria aalge), and Razorbills (Alca torda). Prevalence of infections varied between years and within and among species.
We used the X-ray fluorescent microprobe at the Australian Synchrotron to obtain high resolution elemental images of breast feathers collected from chicks of Flesh-footed Shearwater. The study revealed previously unknown distribution patterns of trace metals, including those arising from major pollutants such as micro-plastics.
We sampled Flesh-footed Shearwater feathers from New Zealand, Lord Howe Island, and Western Australia during the 2008 austral summer and found colony differences in all elements except lead and thallium. We conclude that mercury, and potentially arsenic and cadmium, represent toxicological concerns for this declining species
From the 800+ predator removal programs indentified, a small fraction (n = 112) reported demographic responses of bird populations. Change in productivity was the most commonly reported response, which on average increased by 25.3% (2.5 SE) with predator removal.
Hunting mortality reduced the predicted Gannet Islands Razorbill population growth rate by 0.033, while fox predation reduced population growth rate by 0.017. The Razorbill population on Machias Seal Island appears to be growing rapidly.
Overall breeding success of Tristram’s Storm-Petrel in 2005 and 2006 was 0.27 and 0.28, respectively. Egg abandonment was common at both locations, but no relationship was evident between abandonment and frequency of visits by researchers
Razorbill philopatry and breeding site fidelity rates for the Gannet Islands, Labrador were high with 83% of young birds and 97% of adults returning to the same colony to breed. Emigration distances among colonies in North America ranged from 57 to 1,737 km. One bird, banded as a chick in Scotland in 1971 traveled 3,210 km to the Gannet Islands.
Age at first breeding in Razorbills 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
We evaluated whether annual adult survival of Razorbills covaried with oceanographic conditions in the North Atlantic during 1995–2006. On the Gannet Islands, adult survival (Ф = 0.890 ± 0.053) was negatively correlated with Labrador Current temperature.
During 2003–2006, 69% of all Razorbills carrying food to a chick were attacked (n = 182) and of these attacks, 18% (n = 22) were successful. The frequency of kleptoparasitism observed by Razorbills at the Gannet Islands is one of the highest reported for any seabird.
We developed a simple experimental protocol for quantifying band resighting error rates and identifying trends in digit misidentifications. The resighting error rate varied from 0.035 to 0.134 depending on observer distance and conditions under which the bands were read
Here we report the presence of two white bill lines in 10 wintering Razorbills from Newfoundland, Canada in addition to a small number of unreported birds from museum collections. Multiple white bill lines were a characteristic of the Great Auk and we speculate that this variation in the bill marking in the Razorbill is an atavism, reflecting their common ancestry