| Summary: | Abstract Coastal ecosystems nearby human societies collectively shape complex social-ecological systems (SESs). These ecosystems support high levels of ecological biodiversity while providing resources and services to humans. However, shoreline armoring, land transformation, and urban homogenization across urbanized coastal areas may degrade natural ecosystems and alter how humans and nature are connected. We hypothesize that these alterations extend to residents’ knowledge of SESs. We explore evidence of such cognitive outcomes in graphical mental models of more than 1350 coastal residents across eight states in the Northeast United States. Our results revealed that, in more urbanized areas, residents’ mental models underrepresented complex interdependence between humans and natural components, indicating limited systems thinking. Additionally, urbanization and shoreline armoring were associated with homogenization of mental models. We refer to these results as Urbanized Knowledge Syndrome (UKS). Importantly, respondents with more symptoms of UKS were less likely to self-report adoption of pro-environmental behaviors. These results indicate a potential societal-level erosion of ecological knowledge associated with urbanization in the same way more urbanized areas are associated with diminishing ecological function. Thus, diagnosing and treating UKS is an essential component of urban sustainability.
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