At the Alaska SeaLife Center, Dr. Hollmen's team provides all the necessary care for the Steller's eiders in their virtual habitat. The eider team monitors the birds’ behaviors and health on a daily basis and makes sure the birds have the proper space and food. The enclosures for the birds aren’t exactly like the habitats they typically live in, so it is up to the husbandry team to figure out what the Steller’s eiders need to succeed.
Dr. Tuula Hollmen and her crew work hard to create a habitat that suits the eiders. Remember, Steller’s eiders are migratory birds, so the habitat at the Alaska SeaLife Center has to change season to season, especially during breeding season!
VIDEO: Creating a Virtual Habitat
Tasha DiMarzio explains how the Steller's eider enclosures at the Alaska SeaLife Center can be altered to create a virtual tundra habitat. (2:19)
The area we are sitting in now we call our breeding units. There’s ten individual units or one large unit, and we can create smaller flocks or individual breeding units or one big pen for if we want to winter everybody in this unit, we can do that.
Starting in January through March, we’ll really start watching the birds and seeing who is courting with who and who’s pairing off, and then we’ll move them from what we call the non-breeding or wintering unit and they migrate over to our breeding units (which is just across the walkway). In the winter time we switch them all to salt water because that is where they would be in the wild, out in the ocean, and in the summertime they come to these freshwater tundra ponds. When we were in full breeding season we had covers over one of the pools and it was tundra and then pond on the other side. But now since we are in duck rearing mode we have two ponds and they’re both fresh water.
Getting birds to breed in captivity is always a big challenge. Luckily we are in a state where these birds are actually from, and so we can go out and see what they are using as nest materials and what sites they prefer, if its grass or lichen, and then we try and replicate that the best we can.
We don’t have these big vast tundra fields, so we try and create areas that they can feel secluded and have privacy, but then have it look a little bit like what maybe they would see in the wild. We go to the beach and we collect a lot of driftwood to create visual barriers and blinds and areas that they can be private.
Because each female is picky about where she likes, we try and provide each pair with at least three different nesting options. So a nesting option can be a manmade wooden structure that looks like nothing that you would see in the wild, and then another open tundra-like moss nest, and then a combination of the two: maybe driftwood around a plexiglass-covered structure.
And then the biggest key is just keeping it dry so that the down in the nests stay dry. Because the areas that they are nesting, even though it is Arctic tundra, it’s actually a desert and so there is very little water and rainfall but here we’re in a very rainy climate and so that’s a big challenge we have, is keeping their nests dry while they’re going through the egg laying process, so we come up with different things to try and tackle that challenge.
By altering the virtual habitat, the husbandry staff can try to match the eiders’ needs for the breeding season. Each year, the husbandry team continues to offer the eiders a variety of space and nesting configurations in the habitat, in an attempt to promote successful breeding. If something doesn’t work, they try something different the next year!
After years of trial and error, favorable conditions have been created, allowing some of the eiders to feel comfortable enough to nest! As a result, the team is faced with hundreds of eggs. Some of the Steller’s eider hens incubate their own eggs, but many eggs end up in the care of the husbandry staff when hens don't prepare an appropriate nest. See how scientists can try to play the role of a hen incubating her eggs.
VIDEO: ARTIFICIAL INCUBATION
Nathan Bawtinhimer describes the process involved when humans incubate eider eggs. (1:32)
It's a fun challenge trying to get the artificial incubators to accurately mimic the hen incubating which is very tricky. So we’ve been messing around with a lot of different humidity settings and different methods of turning to more accurately imitate the hen and promote better development within the egg during the incubation process and successful hatching.
It’s important that we candle the eggs regularly so we can keep track of the development inside the egg. By candling them with a bright LED flashlight we can actually see inside the egg and just by looking we can tell how long it’s been incubating for, if it’s on the right track developmentally, and what the estimated hatch should be.
When we are candling the eggs it is actually an important cool down time for the eggs, because we’ll have the top off the incubator which simulates the hen getting off the nest and foraging.
And we also weigh the eggs everyday because during the course of incubation there is a certain range that the egg is supposed to lose to hatch successfully, usually between 12 and 16% of its weight. So we watch their weight loss and we adjust the humidity accordingly. The amount of weight they lose is critical for successful hatching.
We’ll record and enter all the data in the spreadsheet so we can track the weight loss and the development of the eggs. And we keep very detailed records of everything we see every day when we candle.
While scientists are learning about the Steller's eiders at the Alaska SeaLife Center, they also need to learn more about the natural habitat of these birds. If researchers are hoping to increase the nesting population of Steller's eiders in Alaska, there has to be suitable nesting habitat available in the wild. To determine what is available for these birds in the wild, the scientists head out into the field...
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COURTSHIP (n)- the behavior of male birds and other animals aimed at attracting a mate.
HABITAT (n)- the natural home or environment of an animal, plant, or other organism.
HUSBANDRY (n)- the care, cultivation, and breeding of crops or animals.
INCUBATE (v)- to keep an egg or organism at an appropriate temperature for it to develop.
