Long term ecological studies are critical to understand resistance and recovery from disturbances, which can take several years to decades and are thus not easily captured with week(s) to month long studies. Incorporating microbial assemblages into long term studies is equally critical as microbes such as Symbiodiniaceae, viruses, and bacteria play key roles in bolstering host (e.g., coral) resilience and resistance to stressors. Mo’orean reefs (Society Islands, South Pacific) which harbor a diversity of coral and Symbiodiniaceae species, have experienced cyclical bleaching, cyclones, and corallivorous sea star outbreaks since 2005. These disturbances have trigged periods of coral cover decline and recovery, as well as shifts in the dominant reef coral species. However, largescale patterns in the abundance and diversity of Symbiodiniaceae following stressor-mediated coral decline and recovery have not been comprehensively assessed. We address this knowledge gap with a 19-year time series (2005-2024) synthesis of ~275 published works from Mo’orea correlating Symbiodiniaceae in hospite diversity with the dominance of specific host species through documented stressor events over time, by reef zone, season, and shoreside. We predict environmental differences (e.g., light, nutrients) drive spatiotemporal trends in Symbiodiniaceae diversity and abundance, as the reefs zones undergo different stressors. In particular, the back and fringe reef zones are especially exposed to higher nutrient enrichment (especially during wet season) and warmer temperatures. Outcomes from this research may inform which environmental contexts, hosts, and Symbiodiniaceae lineages are more vulnerable/resistant to global change stressors, informing management efforts.

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