More Birds or Fewer Birds Beneath Photovoltaic Panels? An “Intuitive-Contrary” Discovery by a Slovak Scholar
Hello everyone, I’m your financial journalist. Today, we’re going to discuss a topic that may seem high-level but actually affects the very sky above our heads and the land beneath our feet: Are photovoltaic power plants (solar panels) a good or bad thing for birds?
Recently, the international scientific community has been divided. On one side, there’s a significant study published in the journal *Science* suggesting that the large-scale installation of photovoltaic panels in China has led to a decline in bird diversity. On the other side, Dr. Benjamín Jarčuška from the Slovak Academy of Sciences and his team published a paper in the *Journal of Environmental Management* with the exact opposite conclusion: In Slovakia, photovoltaic plants have actually increased the variety of bird species!
It’s like two people watching the same movie and one saying it’s terrible while the other thinks it’s fantastic. Who is right, and are they even watching the same movie?
To clarify this, Observer.net interviewed this Slovak scholar. He’s not only an expert in ecology but also someone who is very meticulous and logical. He broke down the key points of this interview into five aspects. Let’s not get lost in jargon; I’ll explain this ecological issue in plain language.
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1. Core Summary: Photovoltaic Panels Are Neither a “Poison” nor a “Panacea” – They’re Just New Neighbors
First of all, we need to break away from a binary thinking pattern. Many people believe that photovoltaic panels either harm or benefit birds. Dr. Jarčuška tells us: Don’t rush to conclusions; we need to consider the context.
His research compared 32 photovoltaic plants in Slovakia with 32 adjacent farmland plots. The results showed that the types and numbers of birds living near the photovoltaic plants were sometimes even better in certain respects. Especially birds that like to forage for insects in open areas, such as the ochre-rumped thrush and sparrows, seemed to thrive beneath the panels.
However, this doesn’t mean that photovoltaic panels are inherently a “bird paradise.” After all, photovoltaic panels are just cold glass and metal; they don’t produce food or provide nests. The reason they attract birds is that grass and shrubs grow on the land beneath them, creating a complex microenvironment that’s absent in the neatly plowed farmland.
So, the core conclusion is: Photovoltaic panels themselves don’t determine the fate of birds; what really matters is what grows beneath them and what the land was used for before.**
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2. Explanation 1: Why Do Photovoltaic Panels Attract Birds? Because They Provide “Free Ecological Services”
[Plain Language: Beneath photovoltaic panels, it’s like a “buffet” and “hotel” for birds.]
You might wonder, if photovoltaic panels block sunlight, how can birds settle there?
Dr. Jarčuška explains that the panels don’t completely seal off the land. Spaces between the panels or beneath them often become home to weeds and low shrubs, creating a vegetation structure.
Imagine the farmland as a “vast plain” where farmers plow it flat, killing all the insects and leaving no food or shelter for birds. In contrast, photovoltaic plants, because they’re not frequently disturbed (they need to generate electricity and can’t be moved around), allow grass and shrubs to grow. This creates a mini-forest or shrubland:
- Food: The complex vegetation provides more insects for birds to eat.
- Shelter: Birds can build nests and rest in the shrubs, away from predators.
- Perches: The supports and edges of the panels provide spots for birds to rest and observe their surroundings.
The birds that were observed, such as the ochre-rumped thrush and sparrows, don’t really like the panels themselves; they prefer the natural ecosystem that develops beneath them – something lacking in the highly managed farmland.
Key Point: This isn’t the panels’ “merit”; it’s the result of the natural growth of vegetation. If the area beneath the panels were also kept bare, birds wouldn’t come.
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3. Explanation 2: Don’t Compare Photovoltaic Panels to a “Forest After a Storm” – They’re Different
[Plain Language: Natural recovery is like a “self-healing” process; photovoltaic construction is like “cosmetic surgery” with different logic.]
Some might argue, “If forests can recover after a storm, can birds adapt to damaged land after photovoltaic panels?” Dr. Jarčuška is cautious about this comparison:
- Natural disturbances (like storms): It’s like a person falling and breaking a bone, but the body and immune system remain. After a storm, the soil, seeds, roots, and microorganisms recover naturally, following a biological process called “succession.”
- Photovoltaic construction: It’s like a major land modification, with engineered changes like concrete foundations and cleared vegetation. The future of the land depends entirely on human management. If you want grass to grow, it will; if you want it to remain barren, it will.
Key Point: Natural recovery relies on internal forces, while the ecosystem beneath photovoltaic panels depends on external human management. Just because forests can recover doesn’t mean the same thing happens with photovoltaic panels.
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4. The Land’s “Past” Matters, but Don’t Overlook It
[Plain Language: Photovoltaic plants perform better on good land; they may not do so on poor land.]
The study found that photovoltaic plants on former grasslands attract more birds. Does this mean that any land is suitable for them?
Dr. Jarčuška says that while previous land use is important, it’s not the only factor. His model shows that the effect of photovoltaic panels is the result of a combination of infrastructure and the land’s original condition:
- If panels are on grasslands with diverse species, the vegetation recovers quickly, attracting more birds.
- If they’re on highly intensive farmland (e.g., for corn or wheat with heavy pesticide and fertilizer use), the soil may be degraded, and panels may not significantly benefit birds.
However, he also notes that his model only explains 8% of the variation in bird diversity; the remaining 92% is determined by other factors (climate, surrounding landscape, management, etc.).
Key Point: It’s not simple to say photovoltaic panels are good or bad. It’s more important to ask: What do they replace? What do they become? How are they managed?
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5. How to Make Photovoltaic Panels More “Bird-Friendly”? No One-size-Fits-All Solution, but There Are General Principles
[Plain Language: If you want more birds, don’t manage the land too neatly; leave some “mess.”
Since photovoltaic panels don’t attract birds by themselves, can developers make them more bird-friendly through design?
Dr. Jarčuška suggests that there’s no one-size-fits-all solution:
- Maintain vegetation diversity: Don’t cut the grass under the panels too evenly; let it grow naturally.
- Avoid excessive management: Don’t mow or spray pesticides frequently; let the ecosystem function on its own.
- Plan ahead: Consider biodiversity during the site selection and design phase, avoiding important migration routes or breeding areas. Poor choices made early on are hard to fix later.
Key Point: Biodiversity is a result of early design, not a post-event fix. The best way for developers to be both cost-effective and environmentally friendly is to let nature play its role.
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6. Birds Are Smart, but Don’t Expect Them to Adapt Instantly to Photovoltaic Panels
[Plain Language: Birds learn, but from their environment, not from the panels themselves.]
Some might wonder if birds can adapt to photovoltaic panels over time. Dr. Jarčuška mentions research on bird “mobbing behavior” (where birds attack predators like owls). Birds can learn to respond to threats like owl calls, but this doesn’t apply directly to photovoltaic panels:
- Birds learn from danger signals (like owl calls), not from the panels themselves.
- Their adaptation is more about behavioral adjustments (e.g., changing flight routes or using food beneath the panels), not a quick evolutionary response.
Key Point: Birds can adapt, but it’s a gradual and partial process, not as rapid as adapting to climate change. The impact of photovoltaic panels on birds mainly depends on the quality of their environment.
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Conclusion: Lessons for Everyone
- Photovoltaic panels are neither ecological killers nor saviors; their impact depends on how they’re built and managed.
- A “messy” environment (with natural vegetation) is better for birds than a neatly trimmed one.
- Site selection is crucial; photovoltaic plants on grasslands are often more bird-friendly than those on farmland.
- Don’t rely on natural recovery; photovoltaic panels require active human management and design to maximize their ecological value.
So, next time you see large photovoltaic panels, think about what’s growing beneath them. If there’s lush vegetation and birds chirping, those panels are not only generating electricity but also providing a great habitat for birds.