For hungry Asian small-clawed otters at Smithsonian's National Zoo, variety is the spice of life. Since they must sleep at the surface, they often wrap themselves in giant kelp to keep from floating away. Do sea otters eat kelp? Kelp keeps them warm. Urchins eat kelp, and sea otters eat sea urchins. Enter your e-mail address above. (Without otters to keep their numbers down, sea urchins eat too much kelp. North Pacific areas that do not have sea otters often turn into urchin barrens, with abundant sea urchins and no kelp forest. Also the enemy is a man. Sea otters can eat up to 25% of their body weight each day. And sea urchins eat kelp. They are not at the top of the food web, however, and are eaten by orcas, great white sharks and other large predators. Kelp keeps them warm. Time to Eat!! But the area with otters had a much more robust and productive kelp forest. A two-year-old sea otter is starving! Individual otters in an area seem to have different prey preferences. Sea otters do not eat kelp. Sea otters eat urchins and Otter researchers such as Casson know better. By eating sea urchins in kelp forests and crabs in estuaries, sea otters help keep these ecosystems in balance. So when otters keep the population of urchins down, kelp forests expand. Once at the surface, they often eat by placing the food on their stomachs, and then placing a rock on their stomachs and then smashing the prey on the rock to open it and get at the flesh inside. All this eating helps make the sea otter what’s called a keystone predator. Without the sea otters to keep them in check, urchins and other grazing invertebrates can turn flourishing kelp forests into underwater wastelands called urchin barrens. They ate and killed . Register to access: Already Registered? He’s curator of mammals and birds at the Seattle Aquarium. What Do Giant River Otters Eat? Soon the kelp forest begins to grow back. Deeper and deeper she One square inch of it contains 1 million hairs—10 times as many hairs as on your entire head. In Alaska, the rapid loss of sea otters turns out to have a shocking cause. River otters live primarily in freshwater, though they do swim and hunt in seawater. For the study area, the value of sea otters in maintaining carbon-storing kelp forests is anywhere from about $200 million to more than $400 million. It goes like this. However, sea urchins also love to eat the holdfasts of kelp. Casson. When they discovered Sea otters off California in the thirties it was like they discovered dinosaurs, because they thought they were extinct. How do sea otters use kelp? © Society for Science & the Public 2000–2021. And sea urchins eat kelp. Kelp. Kelp is a giant, yellow-brown, rubbery seaweed stretching from the sea floor to the surface. They also rely on kelp to provide them cover from predators, and a habitat for the animals they hunt. A lot of sea otter research focuses on kelp. Killer whales have started eating them. Sea otters eat a diversity of fish and crustaceans, but importantly, they eat the urchins that feed on kelp. But when there are not enough predators like sea otters to feed on sea urchins, the urchins graze over and effectively wipe out kelp forests. The abundant kelp resulted in carbon sequestration worth 2.2 million Canadian dollars as well as increased numbers of valuable finfish worth 9.4 million Canadian dollars. By controlling the size and number of sea urchins (sea urchins are one of their favorite foods, and they eat the larger ones first), sea otters created the opportunity for kelp to grow and flourish, which in turn created habitat for numerous other kelp forest dwellers. Among the otters’ favorites are crabs, clams, mussels, and shrimp—the same delicacies you might see served in fancy restaurants, Casson says. That's because otters eat the sea urchins that would otherwise mow kelp down. Sea otters can eat up to 25% of their body weight each day. Kelp beats otters, as kelp is essential to maintaining a balanced ecosystem and habitat for the otters… This has “You want to look at the three trophic levels: sea otters eat urchins, sea urchins eat kelp.” the importance of being a sea otter: In the presence of sea otters, sea urchin populations are controlled, which allows for kelp forests to grow (left). This is the fourth installment of the Botanize! The site navigation utilizes arrow, enter, escape, and space bar key commands. Otters have some interesting relatives. They also need a lot of food energy to keep warm. How do sea otters stay warm in the cold water? Sea otters live in the Pacific Ocean and are found in Russia, Alaska, Washington state and California. Since sea otters feed on sea urchins, they help to keep the sea urchin populations in balance and in return help to maintain a healthy kelp … Sea otters eat things besides sea urchins. Sea otters do not eat kelp but they do live in the kelp forests. Otters beat urchins, as otters eat urchins. Juvenile salmon, herring and rockfish all use kelp beds for habitat, as do crabs, sea stars, abalone and 4. For 150 years, sea otters were hunted so heavily for their fur that, by 1910, they had disappeared from the waters off Washington and Oregon. Bowlby says, “They eat pretty much anything they can grab onto.”. Watch this video and learn about the important connections among sea otters, sea urchins, kelp forests, and climate change. How do sea otters stay warm in the cold water? The publication, as well as Science News magazine, are published by the Society for Science, a nonprofit 501(c)(3) membership organization dedicated to public engagement in scientific research and education. The reason for this is because sea otters eat sea urchins and sea urchins eat kelp. They hunt and eat Sea urchins, which are spiky slow moving plant-eating animals. Now, descendants of those otters number more than 600. They eat the kelp plants. Sea otters eat a wide variety of prey, including marine invertebrates such as echinoderms (sea stars and sea urchins), crustaceans (e.g., crabs), cephalopods (e.g., squid), bivalves (clams, mussels, abalone), gastropods (snails), and chitons. They help kelp forests to flourish by keeping sea urchin numbers under control. What do Sea Otters Eat? Sea otter eats urchins, crabs, snails, and animals with shells such as calms and abalone and many other marine species. It all comes down to sea urchins. Kelp forests sequester (absorb and capture) CO 2 from the atmosphere through photosynthesis. Ocean and are found in Russia, Alaska, the California state fish about one quarter of their weight... And tend to forage for food during the initial hours of the otters a! Have babies as tools, in these pockets attract other wildlife animal is to... 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