True Love

Cooper Island, Alaska, July 22, 2009 — Black guillemots, like all seabirds, need both parents to incubate eggs and care for young. This mutual participation of males and females in raising young means the breeding success for an individual guillemot depends to a great extent on finding and maintaining a bond with a high quality mate that will share and excel in raising young to fledging.

The cooperation of both parents might be most critical during the current stage of breeding, when chicks are hatching and parents are transitioning from providing nearly continuous warmth (for the egg and young downy nestling) to providing nearly continuous fish (for the rapidly growing chick). During the three-day period the chick breaks out of its shell, parents attend the egg constantly, incubating and turning the egg while also communicating with the emerging chick. After hatching, parents need to both brood and feed the chicks for approximately six days, until they can maintain their own temperature. Parent birds have to do all this while maintaining their own foraging requirements.

Once an individual guillemot has successfully bred with another individual the benefits of retaining a mate are many, but the primary one is likely the demonstrated ability of the mate to share breeding responsibilities and successfully fledge young. That is why on Cooper Island over 95 percent of the breeding pairs remain the same from one year to another, if both members of the pair survived over the winter.

Examining annual survival and mate fidelity is an important part of my initial censoring of the colony in June. Nearly all of the breeding birds are banded with three color bands, allowing individual recognition and rather easy assessment of annual survival and mate fidelity. This year, for instance, orange and yellow-black –black are both back on site. On an adjacent site, yellow-gray-green returned to find that its mate from 2008, gray-yellow-gray did not return so it bred with orange-blue-orange.

Determining who is actually paired with whom can pose some problems, but guillemots frequently reinforce or demonstrate their pair-bond by mutual” head bobbing”. The members of the pair face each other and rapidly move their heads up and down, frequently while circling each other. Guillemot pairs “head bob” when another bird approaches them or when reuniting after a long or short period of separation. Luckily they apparently see me as another bird and when I approach a pair they typically will engage in head bobbing and let me know they are a pair.

When looking at large groups of birds there is another way to determine which are in a pair. While much of the flock might be actively engaged in aggressive displays or pursuing other birds any two birds sitting in close proximity and ignoring each other are almost certainly a stable pair.

After spending the summer at the colony, mainly interacting with guillemots, I have noticed that one could probably use a similar technique to determine pair-bond status in pairs of humans. If you inspect the diners in a restaurant it is not too hard to assess which couples might be having a business dinner (nearly constant but typically unanimated conversation) or a first date (constant, attentive and frequently animated conversation). Couples with long-term pair-bonds certainly will be talking with each other but frequently scan the room or allow periods of silence – hopefully with an expression of contentment.

Share This Post  
Facebooktwittergoogle_pluslinkedin

Footprints

Cooper Island, Alaska, July 19, 2009 — It is not uncommon to hear a hiker or wilderness camper describe the exceptional nature of an outing by emphasizing that at some point on their excursion they realized they might be the first human to ever step foot at that spot. In my opinion, this statement, places too much importance on the individual, in settings which ideally should provide recognition of exceptional nature of an outing by the relative unimportance of oneself compared to the natural world, but it does reflect the common view that people like their wilderness experiences to be “pristine”.

A remote Arctic island (especially one with the lack of amenities of Cooper Island) would seem like a good place to have one of those “I may be the first person to ….” experiences, but surprisingly just the reverse is true. One of the realities of the Arctic is that signs of past human activities are well preserved and highly visible because of the freezing temperatures, minimal vegetation, frozen soil, and slow rates of decomposition. If something is left on the ground or near the surface, there is not much that will cover it up or hide it from people visiting that location in the future. At least two centuries of human activities on and near Cooper Island are preserved here today and provide daily visual reminders that I am unlikely to find a place to step where no one has stepped before.

Inupiat have lived in this region for thousands of years subsisting to a great extent on the abundant marine life in the area of Point Barrow. That Cooper Island has long been occupied, at least seasonally, by the Inupiat is evidenced by its name, Iglurak, meaning island with a house on it. When I first visited the island in 1972 there were remnants of at least two sod huts. Nearby, and scattered the length of the island, were the vertebrae, jaw bones and skulls of bowhead whales, evidence of the past importance of that species to the subsistence diet. Luxurious patches of grass, contrasting sharply with the typical minimal vegetation on most of the island, mark the places where whales were butchered and still provide nutrients for plant growth. Dr. Craig George, a good friend and biologist with the North Slope Borough in Barrow, identifies the waters just north of Cooper Island as an important fall feeding area for whales and, before motorized boats allowed whales to be towed back to Barrow, Cooper Island was the closest land where harvested whales could be butchered. The extent of the Inupiat presence here is evident in the “pre-contact” nature of some of the stone and whale rib tools found on the surface and pottery found below the surface.

The nest boxes I built with both salvaged wood and some new plywood from Barrow are the most widespread sign of a human presence in the past three decades, and my cabin the most obvious change in the past decade. Other signs of relatively recent activities are the depressions and mounds created by the Army Corps of Engineers five years ago when they were assessing the feasibility of using Cooper Island gravel to reconstitute the shoreline in Barrow, where homes and other infrastructure are threatened by erosion.

There is also evidence of the oil industry’s interest in the region in the past four decades. A beached fuel barge that washed up during the early days of development at Prudhoe Bay is at the far eastern end of the island and visible for at least five miles. Parts of a tide gauge installed in the 1990s when an exploratory well was within sight of Cooper and broad deep ruts from seismic vehicles, which passed over the island after exploring offshore are reminders that offshore drilling in the waters adjacent to the island is still a very real possibility.

This brings us back to footprints and their relative importance or unimportance. While humans have been on Cooper Island for numerous and diverse reasons for hundreds of years it is not the people who left their physical footprint on the island that have meant that it is no longer seems “pristine”. Given the connection between carbon emissions, atmospheric CO2 and the warming environment it is the carbon footprint of those whose lifestyles require large amounts of fossil fuel that have changed Cooper Island the most. Increasing temperatures are rapidly altering the size and shape of the island as a loss of permafrost and increasing wave actions speeds erosion. Freshwater ponds, which used to provide breeding areas for shorebird species that typically breed on mainland tundra, have been lost as the winter’s snow melt now drains through substrates that were permanently frozen until just a few years ago. Sea ice that used to be visible from shore during all months can now be hundreds of miles away in August and September. With increased shipping and oil and gas drilling foreseen in the region, Cooper Island faces some major direct threats in the future, but for the present it is the indirect influence of human activities occurring well away from here that are the most immediate threat to the island and its resources.

Share This Post  
Facebooktwittergoogle_pluslinkedin

A Little History

Cooper Island, Alaska, July 9, 2009 — This year, an ambitious “Around the Americas” expedition will attempt to have their sailboat, Ocean Watch, negotiate the Northwest Passage as part of their program to conduct research and also raise public awareness of the state of the oceans. They departed Seattle in early June and will circumnavigate both North and South America in 13 months. Ocean Watch is leaving Nome this week, and will be in Barrow on July 11. You can follow their progress at their website at http://aroundtheamericas.org. They plan on visiting Cooper Island on their way east through the Beaufort Sea, but the timing of that visit will depend on when the ice moves offshore.

Cooper Island, one of the Plover Islands, in fact owes its name to the most famous of the attempts to navigate the Northwest Passage. After the Franklin Expedition disappeared during an attempted westward transit of the Passage in 1845, there were many attempts to find Franklin’s two ships and crew. The H.M.S. Plover sailed to Point Barrow in hopes of finding Franklin as he exited into the Beaufort Sea.

During their search for Franklin, the Plover overwintered just east of Point Barrow, in back of the chain of barrier islands that extend eastward approximately 30 miles from the Point. The captain of the Plover named the island chain after his vessel, and during the winter walked over the ice to two of the islands. One of them, Iglurak — which in Inupiat means “island with a house on it” — the other was named “Cooper’s Island” after one of the ship’s officers.

Egg laying is now complete for all the species on the island and my next post will examine how the type and numbers of birds have changed in recent years.

Share This Post  
Facebooktwittergoogle_pluslinkedin

Friends of Cooper Island