[en] The areas investigated in the course of this study included: (1) the potential for irreversible damage to the productivity, structure, and functioning of a model estuarine ecosystem by increased UV-B radiation input to ecosystems highly stable or amenable to adaptive change, and (2) the sensitivity of key community components (the primary producers, consumers, and decomposers) to increased UV-B radiation. Three specific areas were examined during the past year: (1) a continuation of the study utilizing the two seminatural ecosystem chambers, (2) a pilot study utilizing three flow-through ecosystem tanks enclosed in a small, outdoor greenhouse, and (3) sensitivity studies of representative primary producers and consumers