War-linked mines, spills, and near-miss strikes threaten the Persian Gulf’s fragile ecosystems as heat and pollution compound losses.
A new wave of environmental stress is colliding with the Persian Gulf’s long-running struggle to withstand heat, pollution and rapid coastal change, as fighting tied to Iran has intensified dangers across the region.
Since late February, the Middle East—and the Persian Gulf at its heart—has been battered by the war.. Mines have been deployed across the Strait of Hormuz. the gateway to the Gulf. while countless oil spills have leaked into its waters.. At the same time. missiles have fallen perilously close to Iran’s sole nuclear power plant on the coast. raising concern about the risk of radiation seeping from the facility.
Researchers say this new disruption lands on top of a quieter but deepening decline already shaping the Gulf’s marine life.. Long seen as a naturally “extreme” environment. the Gulf also contains evolutionary riches—species adapted to harsh heat and salinity that scientists increasingly view as living evidence of how life can persist under climate pressure.
Kaveh Samimi-Namin. a marine biologist at the Naturalis Biodiversity Center in the Netherlands who grew up in Iran. warns that ecosystems teetering near environmental limits can tip quickly.. In his view. any event that shifts conditions too abruptly can push animals and biodiversity “off the cliff. ” undoing hard-won resilience.
The Gulf’s ecological story begins with its unusual geography.. Bernhard Riegl. a marine biologist at Nova Southeastern University in Florida who has worked in the Persian Gulf for more than 30 years. describes a sea shaped by geology and geography that are still relatively young.. The Gulf is bordered by Iran and the Arabian Peninsula. and much of its shallow seafloor has been underwater for roughly 6. 000 years.. More broadly, the body of water itself exists because glaciers melted at the end of the last ice age.
That relative youth helps explain why parts of the Gulf’s coral community have had limited time to build the sprawling reef structures seen elsewhere.. Yet scientists say that same “newness” adds value: the corals that live there have evolved in compressed timescales to tolerate a hostile mix of scorching summers. chilly winters and remarkably salty waters.
The gulf’s resilience is not merely a curiosity—it may contain genetic clues relevant to reefs worldwide.. Riegl argues that corals in the Persian Gulf offer “evolutionary gold” by showing how tropical marine organisms cope with conditions expected to become more common in the coming decades.. With many tropical reefs projected to face similar heat and stress by 2100—and already faltering during increasingly frequent marine heat waves—researchers see the Gulf as a kind of natural laboratory for survival under extremes.
The concern now. he and others stress. is that war-linked damage could erase or degrade that laboratory just as scientists are trying to understand what makes Gulf species withstand climate pressure.. Even if some corals and other organisms persist after devastation. the question is whether the ecosystem can remain intact enough to preserve its unique evolutionary pathways.
Beyond corals, the Gulf supports a mosaic of habitats and species.. Patches of seagrass meadows and mangrove forests line parts of the coast, while mudflats provide feeding grounds for migratory birds.. The region is also home to large. distinctive animals: hundreds of whale sharks were discovered in a seasonal aggregation amid an oil field off the coast of Qatar in 2011. and later surveys in 2019 and 2020 identified the largest known herd of dugongs. described as manateelike.
The Strait of Hormuz, where salt water enters the Gulf, is especially important for understanding how impacts could spread.. Riegl characterizes its biodiversity as exceptionally high.. From there. water moves north and west along Iran’s steep shoreline before running south and east along the shallower coasts of the Arabian Peninsula.. That slow counterclockwise circulation. combined with changes in temperature and salinity as water travels through the Gulf. helps shape where conditions are milder—and where biodiversity peaks.
This circulation matters in the context of the current crisis. The report stated that even if attacks focus on Iran, environmental consequences will not remain confined. Oil and other pollutants are carried along the same counterclockwise flow as the region’s water and other moving materials.
What makes the Gulf particularly alarming to scientists is not only how connected it is. but how many stresses have already accumulated.. Over the past three decades of studying the region. Riegl and others describe three key drivers that have already weakened marine systems.. First are a series of heat waves that began in the late 1990s and have repeatedly battered corals.. Riegl estimates that roughly 90% of Gulf corals have bleached.. Bleaching occurs when stressed corals expel their symbiotic algae, leaving corals white.
Second is the region’s building frenzy, especially along the southern coast, where natural shorelines have largely vanished under infrastructure and development. Ports, sewage plants and massive artificial island projects have replaced areas that once supported coastal ecosystems.
Third is pollution, including contamination linked to earlier conflicts.. Riegl points to the first Gulf War. when crude oil spills were extensive and left behind large amounts of hardened residue called bitumen.. In some places. he says. the shoreline can effectively become a layer of bitumen topped with sand. and that contamination has not disappeared.
War-related spill risks can be even more damaging because heat changes how oil behaves in seawater.. Some scientists estimate that the Gulf is the most polluted marine basin in the world.. Among the effects described are the suffocation of mangrove trees. disruption of how hawksbill turtles and green sea turtles smell to navigate. and impairment of fish reproduction.
Pollution is not limited to oil.. Riegl also notes that desalination plants, which often operate alongside electric power generation, discharge hot brine.. In his assessment. the dense brine rapidly sinks and can smother life near the bottom. effectively “sterilizing” the seafloor where little can survive.
With fighting intensifying again, Shokri says researchers do not yet know exactly how the Gulf’s ecosystems are currently faring under the new conflict. But satellite imagery has already revealed several oil spills since attacks began earlier this year.
Still, scientists emphasize that there is time to safeguard what remains.. For coral-focused researchers, the fact that corals persist—even after severe die-offs—is crucial.. Riegl notes that a decade of devastation has not eliminated them.. “They’re small. they’re beaten up. they’ve been through hell. ” he said. but they are still there. offering a narrow window in which conservation and protection could determine whether resilience becomes recovery or collapse.
Persian Gulf ecology Iran war environment Strait of Hormuz spills coral resilience marine heat waves Gulf pollution desalination brine