Hundreds of species live in the kelp forest, a lush undersea ecosystern in which the largest seaweeds.known as grow as tall as trees.
Much like a forest on land, a kelp forest has an upper layer called a conopy, but instead of leafy branches, this canopy contains the topmost foronds of swaying towers of kelp. The largest kelp species extends a hundred feet or more from the canopy down to the seafloor, where its root-like holdfast cings to the rocky bottom and holds it in place.
The stamp pane features a kelp forest in the Monterey Bay National Marine Sanctuary, a federally protected area encompassing 5,322 square miles of ocean off the central California coast. Here, a rich assemblage of marine organisms finds ample food and shelter. One species is especially important tp the survival of the kelp forest itself. The sea otter likes to eat sea urchins, spiny kelp-eatung creatures that can overgraze groves of kelp when otters are absent.海藻森林(背面)