Herbivorous sea urchins (Echinometra mathaei) support resilience on overfished and sedimented tropical reefs.

Human impacts are dramatically changing ecological communities, motivating research on resilience. Tropical reefs are increasingly undergoing transitions to short algal turf, a successional community that mediates either recovery to coral by allowing recruitment or transitions to longer turf/macroalgae. Intense herbivory limits turf height; subsequently, overfishing erodes resilience of the desirable coral-dominated reef state. Increased sedimentation also erodes resilience through smothering and herbivory suppression. In spite of this critical role, most herbivory studies on tropical reefs focus on fishes, and the contribution of urchins remains under-studied. To test how different herbivory and sedimentation scenarios impact turf resilience, we experimentally simulated, in situ, four future overfishing scenarios derived from patterns of fish and urchin loss in other reef systems and two future sedimentation regimes. We found urchins were critical to short turf resilience, maintaining this state even with reduced fish herbivory and increased sediment. Further, urchins cleared sediment, facilitating fish herbivory. This study articulates the likelihood of increased reliance on urchins on impacted reefs in the Anthropocene.

Establishing a Framework for Sustainable Community Action Research.

Community-based participatory research/community-partnered participatory research (CBPR/CPRR) is viewed as a critical approach for improving health and addressing inequities found in under-resourced communities by pairing community partners and academic partners to address health and environmental concerns. This article aims to amplify the potential of the current CBPR/CPPR models through insights learned from the underserved community of Watts in south central Los Angeles. We discuss our framework that shifts the primary academic focus in the community-academia partnership from individual investigators and/or research groups to the academic institution to generate sustainable partnerships. We summarize the Community Action Research Engagement (CARE) Framework as a new set of recommended tenets to expand CBPR/CPPR. This framework can provide guidance for how universities can catalyze: 1) building trust; 2) facilitating knowledge; 3) advancing solutions; and 4) fostering mentorship in the context of leveraging a university's position to address the root causes of community inequities and thus create more sustained partnerships that achieve greater impact within their surrounding communities.