Black Guillemots, unlike many seabirds, lay more than one egg. These eggs are from nest J-09.Share This Post
The first Black Guillemot chicks are hatching in the colony this week and they are just as cute as they are fluffy. There are currently 114 nests with parent birds sitting on eggs or brooding chicks which is making this a productive nesting season and gives us a lot to do each day as we monitor the population. I arrived on the island on July 15th and am up early each day, excited to open nest boxes and discover the newly hatched Black Guillemot chicks. It is a busy time for George and I am trying to help by recording data, checking nests, and assisting with bird banding. I am learning a lot about what it means to be a field scientist, how to collect and record data in the field, and the Black Guillemots that George has spent so much time studying and observing. I’m looking forward to taking this experience back to my students at University Child Development School in Seattle, WA.
I was worried that life on the island would be a big adjustment to my normal city life, but it has been quite comfortable. George is a creative chef, has a fully-stocked kitchen and we have eaten well. Friends stopped by after caribou hunting and brought us filet mignon, corn on the cob, and salad. Fresh produce is a real treat! The cabin is typically 10-15 degrees warmer than 40 degree temperatures outside and feels cozy and comfortable. Email and a few satellite phone calls to my husband and two daughters have kept me connected to home and not feeling too homesick. George has a great library of Arctic-related books and Ice Master, the tale of a vessel trapped and broken by the sea ice just north of Cooper Island a century ago, has been keeping me busy when I am not helping enter data or swapping stories with George. Long days in the field have made it easy to sleep even though it stays light all night.
Mornings are the best time to monitor the nests, so we have been doing chores around camp and exploring the island in the afternoon and evenings. There are many artifacts of past activity on the island and when we walk around George stops often to tell the stories and the history of these finds. One evening we walked east on the tundra-like landscape, discovering where the Arctic fox had been eating Brant eggs, a polar bear sleeping den (old), and some whale bones. We stirred up the Arctic Terns and Sabine’s Gulls, who had nests in the area. The terns squawked and circled but the Sabine’s dive bombed our heads repeatedly. They also landed and walked around pretending to be injured. We were very surprised to happen on a Sabine’s chick and the determined attack on us was explained. In my home state of Washington you have to take a trip out on the ocean for a chance to glimpse a Sabine’s gull so I was delighted to add this to my bird list – and get to see them up close as they tried to hit me in the head!
The weather has been surprisingly mild, even a little too mild with a high of 61 degrees one day! This warm weather sure makes the mosquitos active and we have had a few very buggy days. There is no fresh water on Cooper Island to support mosquitos but with a slight wind from the mainland and warm temperatures thousands of them will make the three mile trip to visit us. Just when I think I can’t take them anymore, the wind picks up and blows them out to sea! Somehow, the mosquitos don’t seem to phase George in the least. Only me!
I only have a few more days to enjoy the hatching Black Guillemot chicks and their engaging parents. Guillemot chicks remain in the nest for 35 days – one of the reasons they are an excellent monitor of the Arctic Ocean ecosystem. Chicks are weighed each day to monitor food intake and cameras track the types of fish that parents are bringing back to the nest. The chicks will have a ten-fold increase in size and be independent when they leave the nest. The late fledglings will be starting their life in the Arctic just as my students are starting their new school year.
–Katie MorrisonShare This Post
COOPER ISLAND, ALASKA — I had no idea when I decided to provide 150 Nanuk plastic cases to protect the Cooper Island black guillemots how much the new nest sites would change the 2011 field season for both the birds and me. It was clear that I would need to arrive at the colony earlier than usual so that Penelope Chilton and I could dismantle the traditional wooden sites that were remnants from a 1950’s Navy camp and replace them with the new nest cases.
Black guillemots at the nest sites originally built by George out of World War II Navy debris.
What I had not anticipated was the amount of individual variation the guillemots would demonstrate in their adoption and use of the nest cases. Some pairs moved into the sites within hours of their deployment while others visited the site once or twice and then moved off to prospect elsewhere in the colony — apparently looking for something that looked more like their traditional site. There was also an issue of asymmetry of response within a pair. In some cases one member of a pair quickly occupied the site but its mate was initially wary of entering and took several days to join its partner. The wide range of responses was reflected in the dates of egg laying with some late adopters laying eggs four weeks after the initial egg in the colony. That led to the unprecedented occurrence of having chicks hatching in some nests while eggs were being laid in others.
The first egg of the season and the first to be laid in the new nest box.
While the nest cases were obtained primarily to address the issue of late-season predation by polar bears, they have also greatly facilitated the capture of adults and my access to eggs and chicks. In the past the array of random wooden structures used to make the original nest sites on the island meant that nest access would frequently require a complicated series of maneuvers in moving multiple pieces of wood and then pivoting the structure the correct way to ensure the safety of eggs or chicks. Incubating or brooding parents would flush off the nest during this process so we kept nest checks to a minimum and would frequently wait until the nest was not attended. With the new nest cases, however, it is possible to lift the lid of the case just high enough to see the nest interior, with little or no disturbance of birds. Additionally, the parent birds feel so secure in the Nanuk cases that their bands can easily be read and, if they have not yet been banded, can be captured and given a combination of color bands. At this point only two of the approximately 240 birds on the island are unbanded, the highest percentage in the history of the study.
The new “nest” are easier to access without disturbing its occupants.
The security of the sites is also the reason why hatching success is apparently going to be very high. That has kept me quite busy for the past two weeks — and because of the protracted egg laying will keep me busy monitoring hatching for two more weeks. Having a large number of chicks on the island in August is important since that is when the pack ice now retreats well north of Cooper. Monitoring the prey that parents bring their young and nestling weight changes as the ice retreats provide important information on how the marine waters of the Arctic are changing during a period of unprecedented ice retreat.Share This Post