Upcoming PolarConnect Event
Be sure to register for our upcoming PolarConnect Webinar on April
18th, 2015 at 1pm Pacific DST [12pm Alaska DST; 2pm Mountain DST; 3pm
Central DST; 4pm Easter DST]!
It’s a free online event where Chief Scientist, Frank, and I will be
talking about the research we've been doing and what life is like on the
ship in Antarctica. Then we’ll open the talk up to answer your questions
live. We hope you can join us!
If you are in Southern California, you can also head down to Cabrillo
Marine Aquarium for their Earth Day and
Bird Festival, for lots of great family fun, and a chance to listen to
our webinar live in their Auditorium.
A Closer Look at Migrations
We’ve been seeing quite a few penguins (and some seals) on the sea ice.
And at least for the emperor penguins, this is the time of year they’re
on their big migration inland to breed. Finn, 1st grade, and Forrest,
2nd grade would like to take a closer look at animals migrating in
Finn, 1st grade, and Forrest, 2nd grade would like to take a closer look at animals migrating in Antarctica.
Not all Antarctic animals migrate. May invertebrates—from the few
arthropods (bugs) on land to the echinoderms and sponges under the
water—stay where they are year-round. However, there are many animals
that do migrate, and there are a few different ways that these migrations occur.
Migrating to and from Antarctica
The most common form of migrating we tend to think about is going to
and from a location, usually with the seasons. Some of Antarctica’s most
famous migrating animals migrate to Antarctica during the summer to feed
on the abundant plankton and fish and migrate away to avoid the cold,
A Humpback Whale. Photo by Katie Pena (PolarTREC 2008/2009), Courtesy of ARCUS.
Humpback whales migrate to Antarctic feeding grounds during the summer
to feed on plankton and small schooling fish. As winter approaches, they
leave for sub-tropical waters along the Eastern Australian coast to mate
and give birth. This migration can be 12,000 to 16,000 miles per year!
Arctic tern from Wikipedia.
Arctic terms are probably the most famous of the migrating animals.
They have a circumpolar migration—meaning they fly from the Arctic to
the Antarctic and back every year. That’s about 44,000 miles! The terns
live in an endless summer, feeding in the North during the Arctic summer
then heading south, making it to Antarctica in time for summer in the
Southern hemisphere. That’s a huge trip to make for a bird that is only
25 inches across.
Migrating with the Sea Ice
Some animals stay in Antarctica year-round, but still have to migrate.
As winter approaches, the sea ice around Antarctica can more than
double, moving access to the water outward. As many marine animals
depend on access to the ocean, they migrate yearly with the sea ice,
staying close to the shoreline.
Adélie penguins running across an ice floe in East Antarctica.
Penguins, like the Adélie and chinstrap penguins, move as sea ice
grows. They migrate across the ice to get from their feeding areas to
their breeding areas or to stay near the sea (depending on the time of
year). Emperor penguins have an even further distance to travel to their
breeding grounds. During the mating season, emperor penguins will walk
60 miles inland from the oceans edge to their breeding area. As sea ice
grows in winter, this distance grows as well. By the peak ice formation,
the emperor penguins can end up walking farther than 100 miles to reach
A Ross seal resting on an ice floe in East Antarctica.
Seals, like Weddell seals and crabeater seals stay near the water’s
edge, moving inward or outward with the sea ice seasonally.
Migrating up and down in the ocean
Krill, a type of plankton. Photo by Jeff Peneston (PolarTREC 2008/2009), Courtesy of ARCUS.
Instead of going back and forth, some migrating animals go up and down.
Antarctica’s rich ocean is home to many different types of plankton,
many of which undergo a “diel vertical migration.” This means they
migrate up and down in the water column with different times of the day.
Many plankton, like copepods and krill, will move up toward the surface
to feed at night then return to the deep during the day to rest and
avoid predators. While this may only be several hundred feet, that’s a
big migration for a tiny plankton! Because there are so many plankton in
oceans across the world that make this migration, the diel vertical
migration is sometimes known as the greatest migration in the world.