Achieving resource sustainability in complex social-ecological systems requires employing place-based management mechanisms congruent with the underlying temporal, spatial, and functional dynamics of the system in question. However, matching management to system dynamics can prove extremely challenging, as has been illustrated in Maine's sea urchin fishery where fishery managers have struggled to resolve management spatial scale mismatch for over two decades. In Maine, the spatial scale of management far exceeds the relevant spatial dynamics of the urchin resource and leaves fine-scale urchin aggregations in a de facto open access state. These conditions facilitated the serial overharvest of urchin aggregations, which caused overharvested areas to transition to kelp-dominated ecosystem states that inhibit urchin recruitment. Although fishery actors contemplated adopting a number of fine-scale management alternatives to enhance social-ecological fit in the fishery, to date, no such alternatives have been employed. We adopted an ethnographic research approach and conducted semi-structured key informant interviews, document analysis of archived meeting minutes, and participant observation at co-management meetings and restoration events to explore these fishery dynamics. Following data analysis, we employed Ostrom's social-ecological systems framework as a diagnostic tool to identify the factors that have influenced management spatial fit in the urchin fishery. Research findings suggest that a number of interacting variables, including harvesters' heterogeneity and conflicting mental models of the SES, low levels of trust and social capital, and changes in the resource system following collapse impeded the degree of collective action necessary to support fine-scale management. Seeking sustainability 277 However, changing leadership characteristics and increasing horizontal collaboration between harvesters and scientists have positively influenced governance outcomes in recent years. These conditions provide a window of opportunity for the urchin fishery to transition towards a more adaptive and collaborative governance arrangement more conducive to addressing problems of fit in the urchin fishery.
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