Marine biologist Dr James Estes research c otters and their habitats in the a l e u t i a n island of the North Pacific Ocean sea o t t e r is feed on animals such as crabs and you r c h i n s islands with c o t t e r is contained a lot of k e l p a seaweed that is an important food source for fish and other CMS however Islands without otters had large population of u r c h i n s but no k e l p c c u r c h i n s v on seaweed since c o t t e r s r able to control the population of u r c h i n s this allows for k e l p to free lake road in those area giving the its information what term best describes the otters g l e u t i a n Island ecosystem a a b e s productivity producer c keystone species decomposers