A 2026 systematic review found that observational evidence of climate-related impacts on Mediterranean-type plant communities is sparse and unevenly distributed. It identified 128 studies, only 9% of them conducted in the Global South. The review documents reported disturbances and vegetation responses, but it does not establish that climate change caused every observed biological change.
What the review examined
Hana Petersen, Ryan Blanchard and Jasper Slingsby reviewed observational studies reporting climate-change impacts on plant communities in Mediterranean-type ecosystems. Their paper, published in Ecological Solutions and Evidence in 2026, covers five separate regions: the Mediterranean Basin, California, central Chile, southwestern Australia and South Africa. These ecosystems are generally characterized by hot, dry summers and cooler, wetter winters. The term therefore refers to a climate type found across several continents, not only the Mediterranean Basin. The University of Cape Town release and Phys.org’s report describe the review and its findings.
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This is a synthesis of observations, not a forecast of future impacts. As lead author Hana Petersen put it: “Much of what we know about the future of Mediterranean-type ecosystems comes from models and experiments. But observations of what is actually happening in natural plant communities are much less common, and the observations we do have are not evenly distributed around the world.”
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What the 128 studies report—and what they leave out
Only 9% of the 128 studies in the review were conducted in the Global South, according to the University of Cape Town release. The release also reports that 11 of the 128 studies were represented in IPCC assessment reports. These figures point to a limited and geographically uneven observational base; they do not mean that impacts are absent from places with fewer studies.
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The studies most often reported climate variability, drought, wildfire, frost, and pathogens or insect infestations as disturbances. They addressed vegetation condition and growth more often than plant diversity, phenology—the timing of seasonal events—or physiology. That imbalance affects which kinds of ecological change the available observations can describe well.
The authors caution that the geographic imbalance makes it difficult to distinguish genuine ecological differences between regions from differences in research coverage. A pattern documented in California or the Mediterranean Basin cannot automatically be assumed to apply in South Africa, central Chile or southwestern Australia. Co-author Jasper Slingsby explained: “This geographical imbalance matters because it limits how confidently we can generalize from one MTE region to another. A response documented extensively in California or the Mediterranean Basin may not necessarily tell us how vegetation will respond in the Cape Floristic Region, for example.”
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Why a climate-and-vegetation link is not proof of cause
Observations can show that climate-related disturbances and vegetation responses occur together, but coincidence alone does not demonstrate that climate change caused a biological change. Fire, land use, herbivory, invasive species and natural ecological variability can also shape plant communities. The review’s reported evidence supports stronger confidence in links between climate-related disturbances and vegetation responses than in attributing observed biological changes specifically to climate change itself.
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What the authors say researchers should do next
The authors call for coordinated work across all five regions, drawing on long-term monitoring and existing observational datasets, as well as remote sensing, experiments and causal-inference methods. They also identify reanalysis of historical datasets as an opportunity. These approaches can contribute different kinds of evidence; no single method, on its own, resolves the challenge of separating climate effects from other drivers.
Petersen framed the goal as more than filling blank areas on a map: “This is not simply a matter of filling gaps on a map. We need to understand whether the mechanisms driving resilience in one region can help us anticipate what will happen in another.” The review’s central message is that better-balanced observations and stronger ways to test causes are needed before findings from one Mediterranean-type region can confidently inform expectations for another.
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