When most people think of sea stars, I don’t think they comprehend that they are rapacious predators scouring the seabed, forcing their stomachs out of their bodies and eating almost everything in sight, but this may simply be a matter of perspective.
Sunflower Sea stars (youtube link) are voracious subtidal predators, feeding on bivalves, snails, chitons, urchins, other asteroids, sea cucumbers, sand dollars, and crabs.
These bottom-dwellers may be humble creatures, but they play important roles in the ocean ecosystem, including keeping populations of shellfish in check, and, according to recent studies, absorbing large amounts of carbon in the world’s oceans. – Sea Stars
It’s now been widely reported that the waters off British Columbia, Canada, are littered with dead starfish, and researchers have no idea what’s causing the deaths. So delicate is the balance in the marine environment that any gain or loss of relatively few animals in any species can have a domino effect with repercussions that span decades. Hopefully, international experts can help figure out what’s killing them.
Who knows? This may even be a case of Mother Nature rectifying an imbalance. An over abundance of starfish were reported in the locations last year that are full of dead and dying starfish this year.
At the end of August, marine biologist and scuba diver Jonathan Martin was out on his usual Saturday dive with some friends when he noticed dead starfish that looked like they had their arms chopped off.
Published on Sep 2, 2013 – A mass die-off of both Sunflower Sea Stars (Pycnopodia helianthoides) and sun stars (Solaster dawsoni) was observed in the waters around Vancouver, BC at the end of August and the beginning of September, 2013. This is video from Kelvin Grove, BC on September 2nd, but similar scenes are seen at Whytecliff park, and other popular local dive sites.