you decide to study feeding relationships among sea otters, sea urchins, and kelp. you know that sea otters prey on sea urchins and that urchins eat kelp. at four coastal sites, you measure kelp abundance. then you spend one day at each site and mark whether otters are present or absent every 5 minutes during the day.

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Sea urchins, kelp, and sea otters' relationships with food 3of 16 You choose to research the interactions between loelp, sea urchins, and sea otters when it comes to feeding. You are aware that sea urchins are a common meal for scaoters, who also consume kolp.

There is a commensalistic interaction between kelp and sea urchins. While sleeping, the sea otter uses the kelp as an anchor. To prevent floating while they sleep, sea otters encircle themselves with kelp. Since the kelp remains unaffected, this serves as an illustration of commensalism. A mutualistic interaction also exists between kelp and sea otters. If there is a huge population of sea urchins, which the sea otter eats, the kelp becomes endangered. When the kelp dies, it floats up and becomes a food source for sea otters. This situation is a mutualistic one because both creatures gain something from it.

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