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Posts Tagged ‘Green Island’

In my last blog I mentioned that the Petit Manan crew had resighted a banded American Oystercatcher (AMOY) with its mate on Green Island which is adjacent to PMI and only accessible during low tide. After observing the banded AMOY in mid-May, we submitted our finding to the Bird Banding Lab website and received information about the bird. We discovered that it was born and banded as a chick in 2006 on Nantucket Island, Nantucket, MA. It was last resighted in 2014 in Charleston, South Carolina,

Observing American Oystercatcher on Green Island. Photo by: John Fatula

Observing American Oystercatchers on Green Island. Photo by: John Fatula

On our second visit over to Green Island we were combing the north-west side for any sign of Oystercatcher eggs, when we noticed that our 9 year-old banded AMOY, with its mate, were unusually vocal. So, we decided to move out of the area and use a spotting scope to watch from a distance. After about 15 minutes of scanning around we noticed tiny little chick heads in the rocks and sure enough they were 3 oystercatcher chicks!  We all watched through the scope as the adults foraged around and were surprised how quickly the adults can extract the meat from a mussel and feed the chicks (about 3 seconds). AMOY chicks will usually stay with the adults for up to a year to perfect their foraging techniques.

Foraging AMOY with 2 chicks( you can see how camouflaged the chicks are.)

Foraging AMOY with 2 chicks: you can see how    camouflaged the chicks are.

Banded AMOY with chicks. Photo by: Julia Gillis

Banded AMOY foraging with chick. Photo by: Julia Gillis

After further research by Linda Welch we were informed that these were the first AMOY chicks to be discovered on Green Island since 1997! Not only that, they have now become the most northerly breeding pair within their range. How cool! We always thought that Green Island seemed like a perfect place for AMOYs to nest, and have seen them loafing there in recent years, but never found any eggs or chicks as the adults are very secretive.  With just a few alarm calls by the adults, the chicks instinctively hide deep in the rocks of the intertidal zone. Each adult will constantly call and try to lure any predators out of the area. We just hope this pair can keep the prying eyes of the gulls away from discovering their chicks so they can grow up and successfully fledge. And we even received a certificate for our efforts.

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-Wayne

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Petit Manan in the foreground and Green Island, connected to PMI by a rocky bar at low tide.

Petit Manan in the foreground and Green Island, connected to PMI by a rocky bar at low tide.

Last Tuesday, the crew headed over to Green Island, joined by biologists Linda, Sara, and Christa, and two SCA students, to survey the seabirds nesting there. After being dropped on the Northeast side of the island, we were all issued “egg rings,” PVC pipe connecters that are sized to allow herring gull eggs to pass through but not great black-backed gull. We formed a line going from the berm through the vegetation and headed west counting gull and common eider nests as we went along.

Egg ring for determining whether a nest belongs to a Herring or Black-backed Gull

Egg ring for determining whether a nest belongs to a Herring or Black-backed Gull

Common eider nests are hidden in the vegetation and beautifully made from the mother hen’s down feathers. She incubates her clutch of 2-9 eggs for around 25 days, only taking breaks in the evenings to drink and feed. After the first week of incubation females are reported to stay on the nest night and day unless disturbed. They go up to 3 weeks without leaving their clutch!

An eider nest lined with down.

An eider nest lined with down.

Skirting the western edge of Green Island, we found the first great black-backed gull chicks of the season and a Canada goose gosling. As we headed back to Petit Manan along the bar from Green Island we spotted two oyster catchers in the cove. In years past they have nested on Green Island, we are hoping they do so this year as well.

Andrea holding a Black-backed Gull Chick.

Andrea holding a Black-backed Gull Chick.

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