Climate Change: Genetic Diversity and Hobby Hunting

New genetic variants emerge only very slowly.

Species that already possess a wide range of hereditary traits today hold an evolutionary advantage. They are able to respond to environmental changes and develop characteristics that ensure their survival — such as altered body size, different behaviour, or resilient plumage and coat colouration.

How decisive this genetic richness is can be seen in a new study by the Swiss Ornithological Institute, published in the renowned journal Science. In it, researchers examined the evolutionary history of the plumage colouration of wheatears, a group of songbirds found in arid and often rapidly changing habitats.

When species learn from one another: evolution through exchange

Under the leadership of Reto Burri of the Swiss Ornithological Institute, the scientists discovered that genetic exchange between closely related species can enable a surprisingly rapid adaptation.

In the case of the Eastern Black-eared Wheatear, a mutation in a single colour gene led to the formation of white plumage patches on the throat and back. This genetic variant was transferred to the Black-eared Wheatear through interbreeding. In both species, the white back colouration ultimately prevailed — a possible advantage in the changing light and temperature conditions of their habitat.

Both colorations are present on the throats today: black and white. A sign that evolution does not proceed linearly, but responds flexibly to environmental conditions, provided sufficient genetic raw material is available.

While rapid adaptation was achieved through genetic exchange between close relatives, more distantly related species required newly emerging hereditary traits over long periods of time, again and again. The result is unequivocal: species exploit every available source of genetic diversity, within and between species, to arm themselves against climate change.

Recreational Hunting: An Additional Stressor in an Already Unstable World

While scientists worldwide are sounding the alarm over the dwindling genetic diversity of many species, recreational hunting actively promotes the very mechanisms that reduce variability:

1. Trophy hunting selectively removes 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 rapidly lose valuable alleles through random effects (genetic drift).

3. Artificially managed wildlife 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 roam less, interact less, and exchange genes less frequently — precisely what they would need in times of climate change.

While nature attempts to keep pace with the speed of change, recreational hunting strips the ecosystem of the very reserves upon which it depends.

The Clear Message from Research

The authors of the new study are unequivocal: for animals to keep pace with the rate of climate change in the future, we must protect the greatest possible genetic diversity — within and between species.

Yet it is not enough to designate protected areas or restore habitats. What is also required is a fundamental political and societal reassessment of recreational hunting:

• Why do we kill animals whose genetic diversity we urgently need?
• Why do we intervene in populations instead of allowing them to self-regulate?
• Why do we cling to practices that demonstrably destroy ecological adaptability?

Conclusion: Ecological Responsibility Instead of Hunting Tradition

Nature has shown us how remarkably flexible 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 urgently. The protection of genetic diversity must take precedence over tradition, hobby, and trophies.