"A young scientist's doctoral research reveals a surprising relationship between sea grasses and sea otters in a California bay. Valuable sea grasses in Elkhorn Slough, in Northern California, were thriving in spite of heavy nutrient pollution from nearby Salinas Valley farms. When Brent Hughes began his investigation of this mystery, he looked at things directly affecting sea-grass growth, such as weather patterns. It wasn't until he compared sea grass cover with otter population that he found a match. In discussions with other researchers, the young white biologist learned that otters like to eat big, meaty crabs, which feed on sea hares, a type of sea slug that in turn feeds on algae growth that smothers the grasses. Following usual procedures, he then designed experiments to prove his hypothesis that the thriving otter population made the sea grass flourish. This intriguing description of the problem he saw and his research process is a model of the scientific method. Interspersed with chapters describing the mystery, the development of the hypothesis, the proof, and the larger idea of 'trophic cascades' (interactions among predators and prey that begin at the top of the food chain) are sections about otters and about sea-grass science in general.

A map, ample photographs, and an attractive design add appeal, and there are sensible suggestions for environmental protection. A thoughtfully organized and attractively presented example of science in the field."--starred, Kirkus Reviews.