Glaucous-winged Gull glaucescens
4cy / sub-ad Jan
sub-adult / 4CY: May
NEW LONGEVITY RECORD OF A GLAUCOUS-WINGED GULL FROM BRITISH COLUMBIA
Determining the maximum age attained by a wild bird requires an individual to be marked as a nestling, usually with a leg band, and subsequently recovered at the time of its death. When banded, it must be released to live a normal, wild, life in which it will encounter predators, adverse weather, starvation, and accidents (Welty 1975). Of the tens of millions of birds that have been banded in North America it is an extremely rare event to have a band return for a species over 30 years old.
On 21 July 1969, a Glaucous-winged Gull (Larus glaucescens) chick (Figure 1) was banded (#0807-31818) on Mitlenatch Island, British Columbia, under a master banding permit issued to the author. Mitlenatch Island is located near the northern end of the Strait of Georgia (49º 57’ 00” N, 125º 00’ 00” W) about 13 km east of Miracle Beach on Vancouver Island. It is a major seabird colony supporting breeding Glaucous-winged Gulls, Pelagic Cormorants (Phalacrocorax pelagicus), Double-crested Cormorants (P. auritus), Pigeon Guillemots (Cepphus culumba), and Black Oystercatchers(Haematopus bachmani) (Campbell et al. 1990a, 1990b).
On 20 September 2006, D. Dean found the banded gull dead among beach rocks about 100 m north of the northern boundary of Kitty Coleman Park. This 10 ha marine Park is located about six kilometers northwest of Courtenay on Vancouver Island, BC and only 46 km from the gull’s natal colony. The chick was about 14 days old when banded so the calculated maximum age, including leap year days, is 37 years, 2 months, 11 days old.
References: see PDF.
|Glaucous-winged Gull glaucescens|
|Olympic Gull glaucescens x occidentalis|