Developing a research project proposal is hard work. In order to receive funding for their project, scientists must be able to explain what they hope to learn and why their proposed question is worth answering. For Antarctic research, scientists must have their project selected by the National Science Foundation (NSF), which coordinates all United States research in Antarctica. As you can imagine, it's a competitive application process!
In 21st-century science, it's all about collaboration. The NSF knows that scientific discoveries are made when scientists with different skills team up to answer a question. Dr. Jo-Ann Mellish and her colleagues, Dr. Horning and Dr. Hindle, agree. This team of physiologists have worked together before and value the expertise each individual brings to the group. Without Dr. Horning's special knack for engineering instruments, Dr. Hindle's expertise in modeling data, or Dr. Mellish's skill at assessing animal health, this project would never have made it past the proposal stage.
In addition to the benefit of varying skill-sets, working as a team gives scientists a chance to bounce ideas off one another. Talking about ideas leads to better research questions - and to successful collaborations like this one, carried out with support from the National Science Foundation (award #1043779).
VIDEO: RESEARCH QUESTIONS
Dr. Allyson Hindle explains the team's research questions for the Weddell seal project. (1:23)
Dr. Allyson Hindle: “ My name is Allyson Hindle, and I’m a post doctoral researcher. I’m one of the Co-PI’s (Co-Principal Investigators) on this project. I work with a lot of the data on the back end.
“One of the questions that we asked was whether changing sea ice conditions might have an impact on seals that depend on the ice. One of the first things that we needed to do, and really the central piece to this project is to look at how much it costs: How much energy does it cost a seal to stay warm in the water compared to on the ice? So in cold water, or in cold air.
“I’m an animal physiologist, so I’m interested in the processes that help an animal function, the internal biology of the animal. All of those internal processes help animals do different things that are necessary for survival, like digesting food, staying warm (thermoregulation), contraction of their muscles so that they can swim, all those types of things.
“I’m really interested in taking our data and trying to get as many numbers as I can for all of those biological, physiological processes, and then putting it together so that we can make some estimates and predictions about how these animals will live if the environment changes.”
Understanding how changes in sea ice cover will impact polar seals hinges on a broader understanding of how different conditions change a seal's ability to thermoregulate. People have known for a long time that water and air have very different physical properties. One difference is in the way that water and air conduct heat. Scientists have calculated that water pulls heat away from a seal's body as much as 4.5 times faster than air. Brrrr! Knowing this, Dr. Hindle and the team believe that polar seals' ability to thermoregulate will be negatively affected if changing sea ice conditions alter the way these species budget the time they spend on ice and and in water.
Further, the team hypothesizes that changes in sea ice will affect some animals more than others. They expect that larger animals with more blubber will have a greater buffer against environmental change, while smaller, leaner animals may face more challenges.
VIDEO: RESEARCH METHODS
Dr. Jo-Ann Mellish describes why McMurdo Sound's Weddell seals were the perfect population to study to test the team's hypotheses. (1:33)
Dr. Jo-Ann Mellish: “Weddell seals were perfect for this project because we have an enormous size range to work with. We’ve got weaned pups all the way up to adult females. Not only do we have this body mass range, but during the breeding season we can also get animals that are in really good condition, so one size and really, really fat and those are our weaned pups.
“We can get the same size animal that’s really, really lean and that’s our first year or second year juveniles, who are about the same size but they’ve just had their first year of foraging by themselves and they’re not quite as chunky.
“Then we’ve got adult females who are enormous. Some of these females are back just to breed, they don’t have a pup that year so they are in ridiculously good health, they have more blubber than you can shake a stick at! Then you’ve got these other females that are the same frame size, but they just finished supporting a pup for the last four to six weeks. So there can be a 100 kilogram (220 pounds) difference in two animals of the same age and the same frame size. So we’ve got big and small, and lean and fat. We've got these four groups of animals that we can look at differences in how they forage, differences in how much energy they burn in a day, and differences in what kind of buffer they might have to adapt to a changing environment.“
In order to test their hypotheses, the team needed to develop a plan. Among the questions they needed to answer were: How would they determine which seals to study and what tools would they use to study the seals once they'd chosen them? These challenges had to be carefully considered before the team traveled to the ice. After all, once you board the plane for Antarctica, there’s no going back for something you forgot!
WHO IS STUDYING SEALS?
PHYSIOLOGIST (n) - a biologist who studies the processes that help living things function
COLLABORATION (n) - the action of working with others to do or create something
ENGINEER (v) - to design or build something
MODEL (n) - in science, a representation of data that makes something easier to quantify, predict, or understand
THERMOREGULATION (n) - the ability to maintain a constant body temperature under changing conditions
DATA (n) -values for something measured
HYPOTHESIZE (v) - to propose an anwer to a scientific question
BLUBBER (n) - an insulating fat possessed by many marine mammals