Polar Gigantism in Antarctica

Update

Now Archived! Antarctica Day Celebration event with Tim Dwyer and Dr. Art Woods live from McMurdo Station, Antarctica. You can access this and other events on the PolarConnect Archives site: https://www.polartrec.com/polar-connect/archive

What Are They Doing?

A Weddell seal meets a cameraman under the sea ice near McMurdo Station, Antarctica. Photo by Steve Rupp, Courtesy of Michael League.A Weddell seal meets a cameraman under the sea ice near McMurdo Station, Antarctica. Photo by Steve Rupp, Courtesy of Michael League. Since the first expeditions to the poles, scientists have compiled a long list of polar taxa that have unusually large body sizes. This phenomenon is known as polar gigantism, and biologists have proposed many hypotheses to explain it. The most broadly-accepted idea is the ‘oxygen hypothesis,’ which states that polar gigantism stems from a combination of high oxygen availability in the ocean and low metabolic rates because of the extreme cold temperatures. In combination, these two factors are thought to allow animals to be giants by making it comparatively easy to get enough oxygen from the environment to support large bodies. The links between body size, environmental oxygen availability, and performance have been used to argue that as marine and aquatic environments warm, giants will be among the first to disappear. We are looking at these tradeoffs and the validity of the size-vulnerability hypothesis using Antarctic pycnogonids (sea spiders), which contain spectacular examples of polar gigantism. Visit the researcher's working group website to learn more information on this topic.

Where Are They?

A sea spider underwater near McMurdo Station, Antarctica. Photo by Adam Marsh, Courtesy of Michael League.A sea spider underwater near McMurdo Station, Antarctica. Photo by Adam Marsh, Courtesy of Michael League. The team is based in McMurdo Station, Antarctica. McMurdo Station is on Ross Island, a volcanic island (with the southernmost active volcano, Mt. Erebus) south of New Zealand in the Ross Sea. Researchers will take day trips from McMurdo Station to dive under the ice using SCUBA equipment at local sites.

Expedition Map

Expedition Resources

Project Information

Dates: 1 October 2016 to 4 December 2016
Location: McMurdo Station, Antarctica
Project Funded Title: Collaborative Research: Body size, oxygen, and vulnerability to climate change in Antarctic Pycnogonida

Journals

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Meet the Team

Timothy Dwyer's picture
Spring Street International School
Friday Harbor, WA
United States

I teach biology, chemistry, AP environmental science and algebra, drawing heavily on my background as an experiential educator and marine ecologist to illustrate the process of science to my students. I developed a foundational interest in science education working with students aboard traditional sailing vessels with Living Classrooms Foundation in Maryland and Ocean Classroom Foundation in Maine. I expanded on this interest as a Marine Science Instructor with the Catalina Island Marine Institute in southern California, where I reveled in exploring temperate subtidal community ecology with middle and high school students. A native of Baltimore, I hold a BA in Biology and Environmental Studies from Bowdoin College and an MS in Biology (Research) from Northeastern University. When not teaching at Spring Street International School in Friday Harbor, Washington, I enjoy SCUBA diving, cycling, and sailing aboard my classic sloop Whistledown.

Art Woods's picture
University of Montana
Missoula, MT
United States

Dr. Woods studies climate change and the physiological ecology of invertebrates. The first major theme in his lab is temperature-oxygen interactions in marine invertebrates, focusing particularly on polar gigantism of sea slugs and sea spiders. He studied gigantism in sea slugs during field seasons at McMurdo in 2006 and 2007, and is currently funded to work on gigantism in sea spiders. The second major lab theme is the physiological ecology of plant-insect interactions, and he particularly focuses on climate change in the microhabitats where insects live. He is an associate professor at the University of Montana (Woods lab page).

Amy Moran's picture
University of Hawaii
Manoa, HI
United States

Dr. Moran studies the physiological ecology and evolutionary ecology of marine invertebrates, with a particular focus on early life history stages – embryos and larvae. One major area of emphasis is the effects of temperature on the energy dynamics of growth and development, and in recent years she has studied polar gigantism in both sea slugs and sea spiders. A second area of emphasis is the effects of temperature on growth, development, and success in many invertebrates including barnacles, sea urchins, worms, and snails; current work in Hawaii also looks at the effects of warm-water events and bleaching on the reproductive success of corals. She is an associate professor at the University of Hawaiʽi at Mānoa. (http://www.moranlab.org)

Bret Tobalske's picture
University of Montana
Missoula, MT
United States

Dr. Tobalske studies comparative biomechanics of and functional morphology of animals. His research involves laboratory and field-based methods to measure three-dimensional motion, fluid dynamics, muscle physiology, material properties and structural design. One major area of his research involves bird flight, with current studies on escape maneuvers in hummingbirds, high-speed maneuvering in swallows, and the development of locomotion in nestling and fledgling birds. His work with invertebrates has included studies of the cost of sexually-selected weapons in beetles, and he is currently funded to study the mechanical consequences of gigantism in sea spiders. He is an associate professor and the director of the Field Research Station at Fort Missoula at the University of Montana. Tobalske lab page

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Latest Comments

Thanks for the kind words. We miss him but love hearing all his stories. -Chris
Mr. Dwyer, I must mention the sad departure of who in life was Ned Goldsmith, on May 10, 2018. I'm from Puerto Rico and I met Ned in 1997 when he was flying through the Caribbean, celebrating his...
I have made a special little arctic bear and would like to put a picture on yr FB-We are all in awe of you guys doing the best for the world
Looking forward to it! On 11/29/16 3:29 PM, PolarTREC wrote: