As far as obscure ecosystems go, the outer edge of expanding sea-ice sheets has got to be near the top of the list. Not algae-living-in-sloth-hairs obscure, I suppose, but then the algae that grow inside the sea ice have a significantly greater impact on just about everything else in the world, other than sloth hair. Sea ice represents a fascinating bit of physical structure in the otherwise largely structure-less surface of the polar seas. And it’s more complex than many people realize. It’s riddled with cracks and fissures, and honeycombed with channels and pockets of super-salty brine, left behind as seawater freezes into largely salt-free ice. For organisms smaller than an inch or two long, the ice edge is a terrain as rich and varied as a coral reef or a tropical rainforest.
For three or four years in the 1990s, I was obsessed with the structure of growing sea ice, and especially with the life that structure supported. My first job in grad school was to figure out a way to capture images of the microbial communities living inside the brine pockets and fissures of Antarctic sea ice—and my last was to plant my feet on that sea ice with a coring augur, and bore down into it to collect samples. I spent countless hours learning about the ice and the organisms that lived in it, and months running thought experiments, tinkering in the lab and racing frostbite to capture untainted samples of the ice’s underside, where all the biological action is. I even deployed plankton nets, many times, with the express purpose of capturing not the giant Antarctic krill, Euphausia superba, but its feces.
I immersed so far, I might as well have been living in a brine pocket myself. But I’d never really seen what goes on at the ice edge until Warner Bros. showed me. That’s right—the trailers for Happy Feet Two, opening now, feature what must be the world’s first-ever animated krill. I suppose this is how the clownfish people must have felt when Nemo broke big.
For large parts of the year, the algae growing within sea ice forms the base of the marine food web in Antarctica, supporting everything from nutrient-recycling bacterial communities to penguins, elephant seals and massive whales. They also produce globally significant amounts of oxygen, while pulling climate warming carbon dioxide out of the atmosphere and exporting it to the deepest reaches of the ocean. Krill are the major link in both those processes, pumping carbon and other nutrients up the food chain as they are eaten by squid, fish and whales, and down to the salty deep as they package their waste in tidy little chitin-sheathed bundles called fecal pellets.
You won’t find those fecal pellets in Happy Feet Two—at least, I don’t think so. But that’s okay. It’s a penguin cartoon after all, and I’m not going to quibble about missing euphausid poop any more than I am about other blown details. (Penguins don’t actually sing and dance, Robin Williams hasn’t been charming in decades.) Instead, I’m just going to celebrate a rare moment when the biologically obscure gets made cinematographically relevant. How very much easier it would have been to explain my work to civilians if only I’d had Bill and Will the Krill as a reference point.
In its small way, Happy Feet Two represents the triumph of the idea of biodiversity. When I was growing up, animated movies were about mice (Mickey), ducks (Donald) or at best, the woodland creatures of ‘Bambi’ or the tropical beasts of ‘Jungle Book.’ But today’s children get exposed to so much more of biology’s rich tapestry—Nemo and the marine realm, the small-scale world of ‘A Bug’s Life,’ the Pleistocene delights of ‘Ice Age.’
Sure a lot of it is corny, all of it is anthropomorphized, and the cutest animals still get to star. But a love of biology always starts with delight in the natural world. Who’s to say that delight can’t be sparked on the big screen, especially when its once-obscure object is too far away to visit? I for one can’t wait for the plush krill dolls that are sure to follow–even if they aren’t biologically accurate down to the last detail.
Images Top: Euphausia superba, Professor Dr. habil. Uwe Kils via wikimedia commons. Middle: Bill and Will face off in Happy Feet Two, Warner Bros. Bottom: The author, left, working hard to get what is now available in a theater near you. Photographer not remembered. Below: Ice breaker Nathaniel B. Palmer, with fecal pellet samples safely on board, casts its shadow against the 90-meter face of the Ross Ice Shelf. Photo by the (tired, cold) author.