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European forest plants are migrating westwards, nitrogen main cause

European forest plants are migrating westwards, nitrogen main cause
2024-10-10
(Press-News.org)

New research reveals nitrogen pollution, and to a lesser extent climate change, unexpectedly as the key driver behind surprising westward shifts in the distribution of plants.

A recent study has uncovered that many European forest plant species are moving towards the west due to high nitrogen deposition levels, defying the common belief that climate change is the primary cause of species moving northward. This finding reshapes our understanding of how environmental factors, and in particular nitrogen pollution, influence biodiversity.

While it is widely assumed that rising temperatures are pushing many species toward cooler, northern areas, this research shows that westward movements are 2.6 times more likely than northward shifts. The primary driver? High levels of nitrogen deposition from atmospheric pollution, which allows a rapid spread of nitrogen-tolerating plant species from mainly Eastern Europe. The establishment of these highly competitive species in areas with high nitrogen deposition rates often comes at the expense of the more specialized plant species.

The results highlight that future biodiversity patterns are driven by complex interactions among multiple environmental changes, and not due to the exclusive effects of climate change alone. Understanding these complex interactions is critical for land managers and policymakers to protect biodiversity and ecosystem functioning.

Key findings:

European forest plants shift their distributions at an average velocity of 3.56 kilometer per year. 39% of the plant species shift westward. Northward shifts are only observed for 15% of the species. Nitrogen pollution rather than climate change is surprisingly the main factor behind westward distribution shifts in European forest plants. The study analyzed the shifts in the distribution area of 266 forest plant species across Europe over several decades, with the first measurements being taken in the year 1933 at some locations. Several of Europe’s most emblematic forests were included in this study, such as the primeval forest Białowieża in Poland. This research was financed inter alia by the Deutsche Forschungsgemeinschaft (DFG; FZT-118). It is a product of the sDiv working group sREplot. iDiv’s synthesis centre sDiv supports working group meetings where international scientists work together on scientific issues.

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European forest plants are migrating westwards, nitrogen main cause

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[Press-News.org] European forest plants are migrating westwards, nitrogen main cause