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The persistent gap, termed the “adaptation deficit,” between the assumed ability of communities to adapt to climate change and the on-the-ground evidence of their progress to adapt is well-documented. To at least partially explain this adaptation deficit, a growing number of researchers have focused on the existence and nature of barriers to adaptation and about society’s ability to overcome them. This paper presents an empirical study that systematically identifies barriers to adaptation processes in the San Francisco Bay Area, California, USA. To do so, a theory-driven framework, previously developed by the authors, was used here to identify, organize, and diagnose barriers in four cities and one largely urbanized region. The study identified as the most frequent type of barrier encountered in these cases is related to institutional and governance issues, followed by the attitudes, values and motivations of the actors involved. Resource and funding constraints also matter, but scientific and technical issues are far less prominent than often presumed. The theoretical framework was found to usefully support the empirical identification and organization of barriers and to provide a “road map” for designing strategies to circumvent, remove, or lower the barriers and thus come closer to closing the adaptation deficit. [ABSTRACT FROM AUTHOR]

• The disaster risk management framework is used to examine the effectiveness of management of extreme harmful algal blooms. • Actions taken in response to the 2015 HAB event differed among states and employment sectors. • Trusted relationships and coordination among agencies and with the fishing industry was associated with effective management. • Actions for increasing resilience to HAB events include building trust and improving coordination and consistency. The human dimensions of harmful algal blooms (HABs) are becoming increasingly apparent as they grow in frequency and magnitude in some regions of the world under changing ocean conditions. One such region is the U.S. West Coast, where HABs of toxigenic species of Pseudo-nitzschia have been found to coincide with or closely follow periods of warming. In 2015, the region experienced a massive HAB of Pseudo-nitzschia that was associated with the 2014-16 Northeast Pacific marine heatwave. The HAB event delayed the opening of the lucrative commercial Dungeness crab fishery for up to 5 months and closed the popular recreational razor clam fishery, resulting in fishery failures and disaster declarations and causing significant sociocultural and economic impacts to coastal communities. Here, management actions are examined that were taken by federal and state government agencies and responses of coastal residents to this extreme HAB event using a disaster risk management framework consisting of four phases: 1) prediction and early warning, 2) event response, 3) recovery and reconstruction, and 4) mitigation and prevention. Clear differences in management actions at the state level were evident in California, Oregon, and Washington during every phase, producing vastly different perceptions of management by coastal residents. A history of trusted relationships and coordination among agencies and with the fishing industry in Washington State was associated with more transparent and accepted management responses. The examination found that additional education, outreach, and trust-building exercises would provide benefits to communities affected by extreme HAB events. Our findings contribute to an understanding of climate change adaptation in coastal communities dependent on fishery resources. [ABSTRACT FROM AUTHOR]