25 November, 1998
PENGUINS! Today was a fabulous day full of Adelie Penguins. We flew north by helicopter along the base of Mt Erebus to an area called Cape Bird where we wanted to fish from the ice edge. When the ice melts, microorganisms and algae that grow on the bottom of the ice are released into the water and this feeds zooplankton which attracts fish and other predators like orcas (killer whales), penguins, and seals. We didn't catch a single fish and we didn't see any orcas, leopard seals, or Emperor Penguins, but we did have a great time with Adelie Penguins whose massive colonies of thousands of birds we saw as we flew in by helicopter.
After we were dropped off by the helicopter we went up to the "kiwi" (New Zealand) penguin research station to get permission from the scientists there to do our fishing, but no one was home. So we decided to bring our gear over to the edge of the ice in a place that would not bother the penguins coming to and from their nesting colonies. To get to the edge of the sea was no easy task. The sea ice had been broken into blue and white blocks of varying sizes, shapes, and textures, and shoved by the wind and sea into a wall over which we had to lug our coolers, traps, other fishing gear, and camera gear. Some of the blocks had frozen into place and others were loose. All was covered with a light layer of sparkling powdery snow so we never knew when we put our feet down if the block we were stepping on would hold solid or if our feet would slide on its angled surface. Sierra stepped on what looked like a solid block which gave way and her leg went down waist deep into a beautiful chamber of ice blocks.
I slipped on angled blocks, banged my knee, and dropped my camera, but all was okay.
Once at the ice edge it was great to plop our fishing lines and baited trap into the sea and to just sit and admire the scenery. The dark blue, almost black water was motionless. Behind us on the other side of the ice-block wall we could hear the snuffling of a Weddell seal as it enlarged its ice hole to pull itself out onto the ice.
Soon he was sound asleep and breathing heavily in the sun. In front of us, for as far as the eye could see, the sea was covered with masses of floating ice of varying sizes and shapes. Beyond it, way in the distance, could be seen the TransAntarctic Mountains, gleaming white in the sun and dwarfed by the huge expanse of baby blue sky. Skuas flew back and forth scanning the water for food and on one of the distant ice floes could be seen a whole line of Adelie Penguins. Soon these Adelies dived into the water and porpoised towards us, leaping in and out of the water. What a sight! They looked like neither bird, nor flying fish, nor porpoise, but at the same time like all of them! They disappeared and we got back to our fishing and scenic photography. All of sudden we were startled by a splash as a penguin shot out of the water and popped onto the ice between Dr Smith and Sierra! He was soon followed by two others. We all stood around looking at each other curiously and then the penguins clambered up over the ice wall seeming to have almost as trouble as we had, slipping, sliding, bouncing, jumping, despite their large, grip-padded feet and strong nails. Surely, I thought, we would never get as good a view as this ever again. I was wrong. All day long, wherever we went we saw penguins, and they sometimes came up to us so close that I couldn't focus my camera. Once I tried to get up to move away from one of them so I could photograph him but every time I sat down, he came so close to me that I could almost reach out and touch him. Most of the pictures I shot with my regular slide-film camera but I have included a few digital photos for you here on this journal page.
While we were fishing I scanned back and forth over and over searching for new birds and mammals like leopard seals, orcas, emperor penguins, and snow petrels but saw none. People say it is not the right time of year to see the birds away from their nesting colonies. One never knows where a whale or leopard seal will turn up, but the Adelies always seemed to think there might be one lurking under the water ready to lunge up and grab one of them. It was comical to watch a line of cute little Adelies on an ice wall ready to jump into the water, wanting to go out fishing or bathing. They would stand nervously at the edge peering down into the water then backing off and walking away, then walking back again and looking out. No one wanted to be the first one in just in case. (It reminded me of the wildebeests trying to cross the Mara River in Kenya, nervous about possible unseen crocodiles lurking in the murky water to grab hold of their legs as they crossed.) Finally one of them got his nerve up and jumped in and they all jumped in almost on top of him like a stampede, and away they went, zipping around underwater like torpedos or fish, flapping their wing flippers as if they were flying underwater.
During the day we saw many interesting things about Adelie Penguins. Here are some of things we saw:
1. Thousands of birds sitting on their eggs in large nesting colonies. Many of them were lying down on their bellies on their nests. Others were standing up. Some were reaching out and aggressively pecking at their neighbors who were doing the same to them. Others were doing their skypointing display, facing each other, stretching their necks pointing their open beaks high into the sky while slowly waving their flippers back and forth and making a growling noise.
2. We had to stay far way from the colony so we wouldn't disturb their behavior. If they were to leave their eggs in fright, the skuas who were almost constantly flying overhead looking for an unattended egg would swoop down, remove the egg, and leave a bewildered and possibly bereaved penguin behind. We saw one dive-bombing skua fended off by a few beak-jabs from nearby penguins, but we saw another skua successfully glide in, remove an egg, and share it with its mate a mere 15 feet away from the group of Adelies from whom he stole it.
3. One pair of neighbors was having an all-out fight. Over and over they butted their chests together (like Hans and Franz) and then started hitting each other with their stubby wing flippers. The sound of the wing-whacking and the accompanying growling of the excited duo was quite loud and all the nearby penguins watched with interest and pecked at the offenders when they came near. I don't know what the fight was all about. I wonder if one of the birds had lost an egg to a skua and was trying to take over another bird's egg. I have heard of such things happening before.
4. Where do penguins get their fresh drinking water? I am sure they get a lot of the moisture they need from the krill and fish that they eat, but they also get thirsty while incubating their eggs. As soon as one incubating bird was relieved by its mate, it went straight to a nearby patch of snow, lay down on its belly, and ate several mouthfuls of cool, thirst-quenching snow. Aaaahhhhh....what a relief. I saw several penguins stisfying their thirst this way.
4. Behind the wall of ice blocks shoved up by the sea, there was a nice spot in the sun sheltered from the wind. I sat in this sheltered spot while a parade of penguins waddled to this nice cozy retreat and soaked in some rays, preened their dense waterproof feathers, snoozed, and generally loafed around. The birds came up to me, curiously looked at me, and then waddled past to enjoy their siesta. This was so amazing that it almost seems like a dream when I think back on it. 5. I often saw large groups of penguins walking long distances along the shore over the snow and wondered why they weren't swimming in the water instead. It is much easier for them to move in the water than on the land. Any ideas of why they might choose the land over the water? (Another Question to Think About.)
It was quite an amazing day. Today and yesterday were probably two of the best wildlife experiences of my life.
INTERESTING INFO ABOUT ADELIES
Like the Weddell Seals I described yesterday, the breeding season of the Adelies must be crammed into a short period of good weather, little sea ice, and abundance of food. The Yellow-eyed Penguin which I told you about while I was in New Zealand is about the same size as an Adelie but its chick takes 14 weeks to become independent of its parents. The Adelie however must grow up quickly and is ready to leave home at 6 weeks of age. To nourish that growth the parents become chick-feeding machines, feeding nearly 1 pound of krill (or small fish) to its baby each day, sometimes more. A study was done at nearby Cape Crozier to figure out how much that colony of 175,000 pairs of penguins feeds to their chicks each season. I'll let you do the math to figure it out: if
175,000 chicks are fed .6 pounds (average) of krill 40 times in the breeding season how many tons of food did they get?
If the chicks converted that food into 875 tons of new chick growth what % efficiency is that? Why didn't it all go into growth? Where did the rest of it go?
If each feeding contained 5000-10,000 krill, how many total krill did it take to raise this colony of chicks over the breeding season? One of the reason why people study Adelie Penguins is to give an
idea of the health of the food web of the area. You can see from the above calculations that Adelies eat an awful lot of krill, a shrimp-like crustacean which eats microscopic phytoplankton and zooplankton. It is a major part of the Antarctic food web which most larger animals including fish, seals, penguins, and whales depend on. These other animals are much harder to keep track of than penguins are since most of them live out in the open ocean underwater and don't breed in big easily-studied colonies. If the population of Adelies is healthy that is a good indication that the ecosystem must be healthy too.
One of the concerns of ecologists is the overfishing of krill. Big ships use a pump to suck up massive numbers of krill which often occur in huge swarms a kilometer long, so dense that they turn the water a reddish color. Krill is a good source of protein and vitamin A. Since krill occurs in patches rather than being evenly distributed throughout the ocean, it is hard to know how much krill there is. If we are not careful this important component of the food web could be overfished. If so what would happen to the rest of the food web?
In my rush to finish things up I don't have time to do a web-search for you, but Australia has an excellent website about the Adelie Monitoring program at their Mawson Base. If any of you can do the search and find this site's http address, I'd appreciate it if you could send it to me to share with the other readers. On this website they show some excellent photos of Adelies and also describe some of the scientific studies being done on Adelies by Autralians. In one of these studies the researchers put radio monitors on the penguins to keep track of how deep they dive for food and how far they go to find food. The site shows some interesting graphs and maps compiling these data as well as a photo of a device they use to weigh the Adelies as they go to and from the colony.
Adelies can dive as deep as 100 feet in search of food and sometimes travel more than 150 kilometers in their quest for food for their chicks.
How do penguins keep warm in this icy world? They have lots of blubber to insulate them and to provide energy which they need to generate heat. They have dense, waterproof feathers which are excellent insulators even in the wind and water. Their feet and flippers have a special arrangement of blood vessels (called the counter-current heat-exchange system) in which the warm blood leaving the body warms up the cold blood returning to the body. Pretty nifty, eh?!
Well, I'd better go get back to my other job, counting and measuring cells.
I hope you have a good day and do something good for someone.
Fred Atwood _________________________________________________________
DO YOU YAHOO!?
Get your free @yahoo.com address at http://mail.yahoo.com
Contact the TEA in the field at .
If you cannot connect through your browser, copy the TEA's e-mail address in the "To:" line of your favorite e-mail package.