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1. Applied ecology, like conservation research, may deal with societal issues if its scientifically based interventions have societal consequences. Human utilization plays a significant role in many ecosystems, so conservation ecologists often have to act on the interface between science and society, where controversies may arise. 2. Using insights from science and technology studies, we have analysed the 15-year controversy on the ecological effects of cockle fishing in the Dutch Wadden Sea, which began around 1990 and involved nature protection and shellfish organizations, as well as several leading Dutch ecologists, in a heated debate. 3. During this controversy, evaluative research on the ecological effects of cockle fishing was undertaken by a consortium of institutes in order to contribute to the process of political decision-making by the Dutch government on cockle fishery in this area. In addition to conservational and commercial interests, ecological research itself became part of the controversy. 4. The research projects on the effects of cockle fishing during this controversy are examples of societally contextualized science, implying that interests and societal disputes are intertwined with scientific arguments. We have applied a dynamic model of contextualization in which societal stakes and scientific uncertainty are considered as the main factors determining the different contexts in which conservation research functions. 5. Synthesis and applications. Conservation research, whether it is fundamental or managerially orientated, is related to greater societal aims and interests and might easily face more or less complex societally contextualized situations. Such situations imply extended responsibilities for scientists. Not only is there a need for sound science, but also for a sound way of interacting and communicating with the societal environment. Some elements of such a notion of extended accountability are presented.

The concept of sustainability has several, sometimes contrasting, meanings that may generate confusion, misunderstanding, and conflict concerning conservation and restoration practices. It is therefore desirable to clarify the concept of sustainability, thereby potentially contributing to mutual understanding, especially when social conflicts arise. This article discusses a recently published typology of three conceptions of sustainability that range from economic to ecocentric valuations of nature. We argue that the typology is incomplete because it does not include the arcadian approaches. For this reason, we introduce a "tripolar model" for conceptions of sustainability, applying it to the debate on shellfish harvesting in the Dutch Wadden Sea. We conclude that the particular visions or conceptions of sustainability held by relevant actors may have an impact on strategies for conservation.

The concept of sustainability has several, sometimes contrasting, meanings that may generate confusion, misunderstanding, and conflict concerning conservation and restoration practices. It is therefore desirable to clarify the concept of sustainability, thereby potentially contributing to mutual understanding, especially when social conflicts arise. This article discusses a recently published typology of three conceptions of sustainability that range from economic to ecocentric valuations of nature. We argue that the typology is incomplete because it does not include the arcadian approaches. For this reason, we introduce a "tripolar model" for conceptions of sustainability, applying it to the debate on shellfish harvesting in the Dutch Wadden Sea. We conclude that the particular visions or conceptions of sustainability held by relevant actors may have an impact on strategies for conservation.