zone, areas, community, flats, area, communities, zones, region, habitats, organisms, species, animals, algae, environment, habitat, rocks, fauna, pools, environments, shores, sand, fishes, ecology, deposits, flat, structure, populations, mud, marsh, regions, barnacles, marshes, distribution, crabs, beach, fish, beaches, shore, sands, plants, population, vegetation, sediment, beds, waters, sites, bars, wetlands, belt, platforms, platform, reefs, snails, fields, alga, snail, flora, reef, biota, rock, site, ecosystem, facies, survey, mats, samples, creatures, gradient, exposure, barnacle, assemblage, height, webs

low, rocky, lower, upper, high, middle, marine, shallow, sandy, higher, habitat, muddy, lowest, extensive, exposed, extreme, tropical, temperate, annual, live, highest, range, mid, atlantic, predatory, largest, coastal, swept, lowermost, north, alaskan, antarctic, adjacent