Climate change: Why genetic diversity is vital for survival – and how recreational hunting further threatens it
New genetic variants emerge very slowly.
Species that already possess a wide range of genetic traits have an evolutionary advantage. They can react to environmental changes and develop traits that ensure their survival, such as altered body size, different behaviors, or resilient plumage and fur colors.
study by the Swiss Ornithological Institute demonstrates just how crucial this genetic richness is . In it, researchers investigated the evolutionary history of plumage coloration in wheatears, a group of songbirds found in dry and often rapidly changing habitats.
When species learn from each other: Evolution through exchange
Led by Reto Burri of the Swiss Ornithological Institute, scientists discovered that genetic exchange between closely related species can enable surprisingly rapid adaptation.
In the Balkan wheatear, a mutation in a single color gene led to the formation of white plumage on the throat and back. This genetic variant was passed on to the southern wheatear through crossbreeding. In both species, the white back coloration eventually became dominant, a possible advantage in the changing light and temperature conditions of their habitat.
Both colorations are present on the throats today: black and white. This is a sign that evolution is not linear, but rather reacts flexibly to environmental conditions, provided sufficient genetic material is available.
While rapid adaptation was achieved through genetic exchange between close relatives, more distant species required the continuous generation of newly created genes over long periods. The result is clear: species utilize every available source of genetic diversity, both within and between species, to protect themselves against climate change.
Hobby hunting: An additional stressor in an already unstable world
While scientists worldwide are alarmed by the dwindling genetic diversity of many species, recreational hunting promotes precisely those mechanisms that reduce variability:
1. Trophy hunting involves selectively removing the strongest animals.
Large, healthy, genetically valuable individuals are shot first; the most important carriers of robust genes disappear from the population.
2. High hunting pressure leads to smaller, unstable populations.
Small populations quickly lose valuable alleles due to random effects (genetic drift).
3. Artificial wild populations promote inbreeding
Where wildlife is intensively hunted and simultaneously “managed” through feeding or releases, the risk of genetic impoverishment increases.
4. Recreational hunting disrupts natural dispersal and mating processes.
Animals are able to migrate less, interact less, and exchange genes less frequently – exactly what they need in times of climate change.
While nature tries to keep pace with the speed of change, recreational hunting deprives the ecosystem of the reserves it depends on.
The clear message of the research
The authors of the new study are clear: In order for animals to keep pace with the speed of climate change in the future, we must protect the greatest possible genetic diversity, both within and between species.
But simply designating protected areas or restoring habitats is not enough. A fundamental political and societal reassessment of recreational hunting is also needed.
- Why do we kill animals whose genetic diversity we urgently need?
- Why do we intervene in populations instead of letting them regulate themselves?
- Why do we cling to practices that have been proven to destroy ecological adaptability?
Conclusion: Ecological responsibility instead of hunting tradition
Nature has shown us how remarkably adaptable species can be when we give them the chance. In times of climate change, genetic diversity is not a luxury, but a necessity for survival.
A modern, science-based environmental policy must not allow hunting practices to destroy the very foundations that wildlife needs most. The protection of genetic diversity must take precedence over tradition, hobby, and trophies.
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