The cumulative toll on coastal benthic ecosystems is no longer a forecast, it is a measurable reality, and the scientific community now has the tools to document it with unprecedented clarity. This synthesis of stressors, from warming and acidification to bottom trawling and coastal development, confirms what many have suspected: these pressures do not simply add up; they interact, amplify each other, and push ecosystems toward thresholds we are only beginning to define. For researchers, policymakers, and ocean stewards, the practical implication is that managing single stressors in isolation will no longer suffice. The data demands an integrated response.
What makes this review particularly valuable is its emphasis on what we still do not know, even as methodological advances sharpen our view. Environmental DNA metabarcoding, automated imaging, and multi-stressor experiments are now detecting changes at scales that were impossible a decade ago. Yet the review is honest about persistent knowledge gaps, how exactly do hypoxia and warming combine to alter trophic pathways? Where are the tipping points for habitat-forming species under simultaneous acidification and eutrophication? These are not academic curiosities. They are the questions that determine whether a marine protected zone can actually preserve benthic function, or whether a speed restriction for tankers, like the one Malaysia restricts tanker traffic and bunkering in new Strait marine protected zone, is sufficient to protect sediment communities from compounding harm.
The benthic realm regulates nutrient cycling, carbon burial, and the very coupling between seafloor and water column that sustins fisheries. When we simplify these assemblages, when we lose calcifying organisms to acidification or remove habitat-forming species during marine heatwaves, we alter the ocean's capacity to buffer climate change itself. This is not a distant problem for the continental slope. It begins in the shallow coasts where most human pressures converge, and it connects directly to the nations with the largest historical CO₂ emissions, whose cumulative output continues to drive the warming and acidification that benthic communities now face. Understanding that connection is essential, because the benthic response to climate change is not a separate story from the one Tracking the nations with the largest share of historical CO₂ emissions tells, it is the same story, written in sediment cores and shifting species distributions.
The most concrete takeaway from this review is that interaction effects are not marginal; they are the dominant driver of ecological change in benthic systems. A stressor that seems manageable alone, say, a localized pollution source, can become catastrophic when combined with ocean deoxygenation and warming. For management, this means that monitoring programs must shift from tracking individual variables to measuring integrated ecosystem responses. For the research community, it means that trait-based analyses and multi-stressor experiments are not optional refinements; they are the only path to mechanistic understanding. The question we should be watching is whether our governance structures, which are largely designed around single-sector management, can adapt quickly enough to act on that integrated knowledge before the next heatwave or hypoxia event pushes another benthic community past its threshold.