Ringed Seals Balance Food and Polar-Bear Risk
Key Vocabulary
| Word / Phrase | Meaning | Example |
|---|---|---|
| predator | an animal that hunts other animals | The polar bear is an important predator of ringed seals. |
| prey | an animal that is hunted by another animal | Ringed seals are prey for polar bears. |
| diversity | the presence of many different types of something | The researchers studied the diversity of fish in the area. |
| track | to follow the movements of a person or animal | Scientists used GPS devices to track the seals. |
| habitat | the natural place where an animal or plant lives | Sea ice is an important part of ringed-seal habitat. |
Article
Finding dinner can be dangerous when something else wants to eat you. A Canadian study found that ringed seals in eastern Hudson Bay change their behavior depending on both polar bears and the variety of fish available. [1]
Researchers from the University of British Columbia and partner organizations tracked 26 ringed seals and 39 polar bears. They combined GPS information with sea-ice data and estimates of which fish species were available. [1][2]
In general, seals avoided areas where polar bears were very active. When they entered those areas, they often moved through them quickly.
However, the pattern changed when many kinds of fish were available. Even in areas with higher bear activity, seals made longer dives when the fish mixture was especially varied. [1]
The researchers suggest that food diversity can be valuable because different species give animals more chances to find something to eat. In safer areas, seals did not need to work as hard when fish diversity was high.
Climate change makes this relationship especially important. Ringed seals depend on sea ice, and changes in ice can also change predators, prey and where animals can feed. [3]
The study shows that protecting wildlife habitat is not only about finding places with food. Scientists also need to understand danger. For a seal, the best habitat may depend on what is below the water and what is walking on the ice above.
Discussion Questions
- Why might an animal choose better food even when the area is more dangerous?
- How can climate change affect relationships between predators and prey?
- What wildlife in your country depends strongly on one type of habitat?
- What information should scientists study before protecting an area for wildlife?
- How is an animal's choice between food and safety similar to choices people sometimes make?
References
- University of British Columbia, "Seals risk death by polar bear for a varied meal, UBC study finds."
- Florko et al., "Predator and prey landscapes interact with prey diversity," Ecology Letters.
- Fisheries and Oceans Canada, "Researching the impacts of climate change on marine mammals."