Faced with a changing climate, animals and plants accelerate their migration far beyond established scientific forecasts.

A vast scientific analysis reveals an unexpected upheaval. Animals and plants are no longer following the rhythm imagined by climate models. Their displacement is accelerating significantly, reshaping natural balances at a surprising speed that even the most seasoned researchers find surprising.

Birds migratory fly over a green valley, symbolizing an increasingly rapid migration under the effect of global warming – DailyGeekShow.com / Image Illustration

A global analysis reveals that species are migrating up to four times faster than predicted

By cross-referencing thousands of observations from the BIOSHIFTS database, scientists have highlighted an unexpected and massive phenomenon. Indeed, the actual speed far exceeds the estimates from classical models, fundamentally disrupting the understanding of current natural dynamics.

Lire aussi
En France, mushrooms still marked by Chernobyl worry researchers about the invisible legacy of nuclear

The results published in the scientific journal PNAS are a clear and hard-to-ignore statement today. Thus, species are moving on average four times faster than predicted, revealing a major flaw. Therefore, climate models become a central issue for research.

Why current climate models strongly underestimate the actual speed of migrations

The models used are based on climate projections and often simplified ideal habitat conditions. However, the ecological mechanisms largely escape these tools. In reality, biological interactions and adaptive behaviors profoundly alter the observed trajectories.

In marine environments, the gap between theory and reality is even more pronounced and particularly striking. Indeed, the accelerated migration is explained notably by a greater continuity of habitats. In addition, species react more quickly to variations in global temperature.

Lire aussi
This clay jar buried in the garden halves your water consumption once the warm days arrive

On land, the situation appears more contrasting and strongly depends on the studied territory and local constraints. Thus, mountains, cities, or agricultural lands fragment habitats. Consequently, physical obstacles slow down some migrations while accentuating ecological pressures.

Rapid displacements that disrupt ecosystems and directly impact human activities

This accelerated displacement of species is not without consequences and is already observed in several regions of the world. Indeed, the reorganization of ecosystems modifies food chains. Furthermore, it also transforms biological interactions and landscapes that were thought to be stable for decades.

Human activities are also directly and sometimes unexpectedly affected in certain territories. Thus, agriculture, fisheries, and forest management must now deal with mobile species. Consequently, economic impacts are becoming increasingly visible.

Lire aussi
Rare earths: France builds its first recycling plant to counter Chinese monopoly

Genetic diversity becomes a lever for survival and colonization of new territories

A second study published in Ecology Letters provides additional particularly interesting insights for researchers. Indeed, species with high genetic diversity seem to better withstand temperature increases. Thus, genetic diversity emerges as a determining factor.

These species not only resist ongoing climate changes on a global scale. On the contrary, they also colonize new territories more effectively when conditions become favorable. Therefore, climatic expansion illustrates their adaptation capacity.

These discoveries call for a reassessment of conservation strategies implemented in many countries until now. Indeed, researchers emphasize the importance of improving existing models. Thus, scientific tools become urgent to anticipate future transformations.

Lire aussi
Geothermal energy: this treasure buried under our feet could cover 15% of global electricity demand by 2050