Tuesday, July 17, 2007

Uncommon Eiders

Common eiders are big ducks, adapted to deep diving and processing mussels and other bivalves with their powerful gizzards. They are supremely well-insulated, spending summers and winters in cold North Atlantic waters. They get on with courting in what seems like midwinter, and by the time the hens lay eggs in spring, the males’ work is done. So here it was, early June, and the drake eiders were already molting out of their nuptial finery and looking pretty patchy.



I don’t know why I wanted to shoot pictures of an eider in nice plumage. Molting eiders are still eiders, but… I got plenty of opportunities to shoot molting males. When this nearly immaculate drake decided to spend the afternoon bathing and preening in easy shooting distance of the Hog Island shore, I grabbed the chance.
He fluffed and splashed and kept rising up to beat his beautiful wings. There’s a faded citrus-green on the back of a drake eider’s head that is hard to find anywhere else in the bird world. And I’ve thought about it, but I can’t guess the function of the fleshy processes that run from the bill toward the eye. Maybe they just look cool to female eiders.
The females make the most amazing nests, great rings of thick mocha-brown down over a grass-lined depression in the ground. They pull the down from their breasts, and draw it over the eggs like a blanket when they have to leave to feed. No help from the drake! If a female eider is surprised on the nest, she’ll evacuate the foulest contents of her caecum onto the eggs. Even a hungry fox may refuse eggs so anointed.

I skinned a drake eider once. Two inches of feathers and a thick layer of fat covered a dense, strongly muscled body. The gizzard of an eider can take a clam and reduce it to liquid. When I got the skin cleaned and sewed it back over the cotton body I’d fashioned, that bird looked like the nicest sofa pillow you could want. I understood why people made feather muffs and blankets of eider skins, sewn together. I’m glad those eider-using days are over, except for some Inuit artisans, because the common eider is declining throughout Maine. They can’t raise young around the abundant and voracious greater black-backed gulls, which pick their ducklings out of the water as soon as they’re hatched. I'll think more about this unfortunate situation in my next post. Not trying to be a downer, understand: just hoping to sound an alarm for a signature bird of the Maine coast.

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14 Comments:

At 6:50 PM, Blogger KatDoc said...

"I’ve thought about it, but I can’t guess the function of the fleshy processes that run from the bill toward the eye. Maybe they just look cool to female eiders."

Sometimes I think we science chimps always want there to be a reason for everything, an answer to every "Why." What if the answer is "Why not?"

I think that in evolution, one of 3 things can happen:

1) A trait is injurious to the species as a whole - it is selected against. (Near-sighted animals don't see the predator, get eaten, and so don't reproduce more near-sighted offspring.)

2) A trait is beneficial to the species as a whole - Nature selects for this trait. (The faster cheetah catches the antelope, is healthy enough to reproduce, and breeds more fast cheetahs.)

3) A trait neither helps nor hurts the species; because it doesn't cause the death of individual, it may be perpetuated. If it is a dominant trait, it shows up in more and more members of the species and eventually becomes the norm. (Big nose of the proboscis monkey. The suggestion is that females prefer the big nose, but why? What purpose could it serve? How does it perpetuate the species?)

Just some random musings. Loving the Maine series.

~Kathi

 
At 7:21 PM, Blogger Julie Zickefoose said...

Yeah, OK, I hear you, KD. These seabirds are designed so close to the bone--when you think about the vicissitudes of the environment they endure, it's tempting to assign a function to every little feather and nerble. Thanks for pulling me back...but I did allow that maybe the bill processes just look cool to female eiders, like the Durante noses of proboscis monkeys must to female monkeys (good point)...or the huge facial plates of male orangs...or the ridiculous plumes of birds of paradise. It's a big ol' goofy world, isn't it?

 
At 9:06 PM, Blogger Mary said...

Julie,

You skinned drake eider. I find your knowledge so fascinating (and over my head) but I keep coming back.

I can competently comment on your photography skills, however. Amazing. You caught that bird fluffing and splashing so well...

 
At 12:14 AM, Blogger Trixie said...

Got to ask about skinning the eider....was it for an exhibit?

 
At 3:51 AM, Blogger BT3 said...

My Dear Science Chimp:
When you skin a 'greater' black-backed gull, do you have to use a cheese grater or, perhaps a road grader?

Either way, it must be a grate experience.

I'd rather skin one of them, than a less black-backed gull. Or a prarie wobbler.

Tweakingly yours,
BOTB

 
At 6:38 AM, Blogger RuthieJ said...

What a beautiful duck! I'm glad you were able to snap those pics to share with us.

 
At 6:47 AM, Blogger Jayne said...

What a fascinating bird! Hmmm... just defecate on your eggs and no one wants to eat them. But then you have to get back on them...ewwww. That would be a looooong incubation! Wonderful photos.

 
At 6:51 AM, Blogger nina said...

Could that "fleshy process" serve some sort of purpose in maybe protecting the eye, either from the harshness of salt water diving or spiky food?
Hmmmmm. Beautifully colored bird.
Sad to think they're struggling.

 
At 9:16 AM, Anonymous mon@rch said...

such an amazing shot of these eiders! WOW! Reminds me of my trip to cape cod!

 
At 4:41 PM, Blogger Julie Zickefoose said...

Hi Trixie,

As a college student, I prepared a number of skins for the Museum of Comparative Zoology at Harvard. Did it to learn how to do it. Skins, as distinct from mounts--they're simple, stuffed with cotton, lying on their backs so they fit in drawers. It's a nice thing to be able to do with those exquisite window and roadkills we all admire and then bury. This preserves them for centuries, provided they're kept in the dark in sealed cabinets with paradichlorobenzene to protect against dermestid beetles and moths. I use skins as reference for most of my paintings.

thanks for the catch and the tweak, BT3. Now go back to bed.

 
At 5:25 PM, Anonymous MI-in-OH said...

What the Doc said.

It's a neodarwinian world, but many of the traits we see in a given species are undoubtedly the result of the simple process of genetic drift.

It would be interesting to see the world in, say, 10,000 years. I would expect to see the trend toward habitat fragmentation to continue during that 10K years. Genetic drift can produce startlingly rapid change in relatively small and genetically isolated populations. Particularly in the botanical world, I suspect there will be an acceleration of the process of speciation, and that this acceleration will largely result from genetic drift rather than local selective pressures.

 
At 10:44 PM, Blogger Susan Gets Native said...

I have the answer for the big-nosed monkey thing...you know what they say about guys with big noses.
Wait for it.....



They can find the FOOD!


You thought I was going to go "there", didn't you? You dirty minded loonies.

 
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