Have you been watching Big Blue Live on PBS this week? This live show’s website explains that the program “celebrates a wildlife success story and marine animal phenomenon: humpback whales, blue whales, sea lions, elephant seals, sea otters, great white sharks and more all convene in Monterey Bay once a year.” The show includes lots of interesting marine factoids, live shots from above and below the water, plus film clips that provide extra, in-depth info. It also allows viewers to participate on social media. Kind of a fun way to spend an hour!
So for our endangered species of the week, let’s take a closer look at two related animals found a little further north – seals. Both of these cold-weather-loving species are protected under both the Marine Mammal Protection Act (MMPA) and the Endangered Species Act (ESA). Both are threatened by the loss of sea ice due to climate change. They’re the ringed seals (Phoca hispida) (photo from Paul Nicklen athttp://animals.nationalgeographic.com/animals/mammals/ringed-seal/) and bearded seals (Erignathus barbatus),
The ringed seal is the smallest seal (averaging 110-150 lbs and 5 feet in length) in the arctic, feeding on fish and invertebrates. They are generally solitary animals. Females reach sexual maturity around 4 years, while males don’t mature until about age 7. Gestation lasts about 9 months, and the females give birth in ice “lairs” that they build out of the thick ice in their habitat. These small seals can live 25 to 40 years. Seal fun fact: these guys can dive for 45 minutes without a breath!
On the other end of the spectrum, the bearded seal is the largest seal in the arctic, weighing in at a hefty 575 to 800 lbs! These seals also have a lifespan of about 25 years and are thought to reach breeding age around 6 to 7 years. These seals are divers, feeding on benthic creatures such as shrimp, cod, crab, octopus, and clams. For a very cool video of the bearded seal, see this Arkive video!
National Geographic. 2012. “Ringed seal (Phoca hispida)” Accessed online 12/23/2012.http://animals.nationalgeographic.com/animals/mammals/ringed-seal/
NOAA Fisheries Office of Protected Resources. 2012. “Bearded Seal (Erignathus barbatus)” December 21, 2012. Accessed online 12/22/2012.http://www.nmfs.noaa.gov/pr/species/mammals/pinnipeds/beardedseal.htm
NOAA Fisheries Office of Protected Resources. 2012. “Ringed Seal (Phoca hispida)” December 21, 2012. Accessed online 12/22/2012.http://www.nmfs.noaa.gov/pr/species/mammals/pinnipeds/ringedseal.htm