A 2026 systematic review found that observational evidence on climate-change impacts in Mediterranean-type plant communities is uneven: just 128 studies met its criteria, and only 9% were conducted in the Global South. The studies report disturbances including drought and wildfire, but observing vegetation change alongside climate change does not, by itself, prove that climate change caused the biological change.
What the review examined
Published in Ecological Solutions and Evidence in 2026, the review by Hana Petersen, Ryan Blanchard and Jasper Slingsby examined observational studies reporting climate-change impacts on plant communities. It is a synthesis of observations, not a forecast of future impacts. The authors describe Mediterranean-type ecosystems as having hot, dry summers and cooler, wetter winters.
Here, “Mediterranean-type” does not mean only the Mediterranean Basin. The review covers five geographically separate regions: the Mediterranean Basin, California, central Chile, southwestern Australia and South Africa. The University of Cape Town release and Phys.org’s report identify the paper as “A systematic review of observational studies reporting climate change impacts on plant communities in Mediterranean-type ecosystems,” DOI 10.1002/2688-8319.70304.
What the observed studies report
The review found 128 studies that met its criteria. Reported disturbances included climate variability, drought, wildfire, frost, and pathogens or insect infestations. Studies more often examined vegetation condition and growth than plant diversity, phenology or physiology.
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These findings describe what observational studies have reported; they do not establish that every listed disturbance is increasing everywhere, or that each observed vegetation response was caused by climate change. The evidence base is also weighted toward some topics over others, so the relative attention researchers have given to growth or vegetation condition should not be mistaken for proof that those responses matter more ecologically.
Where the evidence is missing
Only 9% of the 128 studies 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. The authors identify geographic imbalance as a barrier to distinguishing genuine ecological differences between regions from differences caused by where research has been conducted.
As a result, findings from California or the Mediterranean Basin cannot automatically stand in for South Africa, central Chile or southwestern Australia. The review’s headline numbers show a broad imbalance, but the available reports do not provide exact regional study counts. Hana Petersen, the lead author, said: “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.”
Why observed change is not the same as proof of cause
A plant community may change during a period when climate is also changing, but that timing alone does not show climate change caused the biological response. Fire, land use, herbivory, invasive species and natural ecological variability can also affect vegetation. The University of Cape Town release describes stronger confidence in links between climate-related disturbances and vegetation responses than in evidence that climate change itself caused observed biological changes.
That distinction matters when interpreting reports of drought or wildfire alongside vegetation change. An observational study can document a pattern or association; attribution requires evidence that can separate climate influence from other plausible drivers. The release quotes co-author Ryan Blanchard: “Seeing that vegetation has changed at the same time as climate has changed does not necessarily tell us that climate change caused that vegetation change. There can be many other factors involved, including fire, land use, herbivory, invasive species and natural ecological variability.”
What researchers recommend next
The authors call for coordinated work across all five regions, bringing together long-term monitoring, existing observational datasets, remote sensing, experiments and causal-inference methods. They also point to reanalysis of historical datasets as an opportunity. These are complementary approaches, not a guarantee that any single method can resolve attribution on its own.
Better geographic coverage would help researchers test whether mechanisms associated with resilience in one region also operate in another. As co-author Jasper Slingsby put it: “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.” Petersen added: “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.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this means for understanding climate impacts
The review provides a map of the observational evidence and its blind spots, rather than a single verdict on how all Mediterranean-type ecosystems are responding. It documents a literature focused more often on vegetation condition and growth, alongside reported disturbances such as drought and wildfire, while showing that many regions and aspects of plant communities remain less represented. The clearest implication is that stronger conclusions require broader, coordinated observation and careful separation of climate effects from other causes.
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