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Insects in the city: Flowers alone may not be enough to sustain them

Phys · · 786 words · By Anna Püntener
Urban Biodiversity Pollinator Conservation City Planning

A study by the Federal Research Institute for Forest, Snow and Landscape (WSL) examines how urban density and flower diversity affect pollinator activity in Zurich. The findings suggest that while some large bees adapt well to city centers, hoverflies and beetles require more extensive green spaces to thrive, necessitating coordinated city planning and private action.

open_in_new Read the original article: https://phys.org/news/2026-05-insects-city-sustain.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyDetected Techniques

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.

fact_checkFact-Check Results

12 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

info Single Source 4
verified Verified By Reference 2
check_circle Corroborated 2
schedule Pending 2
verified Verified 1
help Insufficient Evidence 1
verified
“A study by the Federal Research Institute for Forest, Snow and Landscape shows that insects can pollinate plants in the entire city.”
VERIFIED
The claim is directly supported by a web search result detailing a study by the Federal Research Institute for Forest, Snow and Landscape (WSL), and the existence of the institute is confirmed via Wikipedia.
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wikipedia NEUTRAL — The Domain of the Swiss Federal Institutes of Technology (ETH Domain, German: ETH-Bereich, French: Domaine des Écoles polytechniques fédérales) is a union of Swiss governmental universities and resear…
https://en.wikipedia.org/wiki/ETH_Domain
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wikipedia NEUTRAL — This is a list of forest research institutes around the world, by continent and country. It includes research institutions with a primary focus on forest science, forestry, forest management, and rela…
https://en.wikipedia.org/wiki/List_of_forest_research_instit…
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wikipedia NEUTRAL — The Swiss Federal Institute for Forest, Snow and Landscape Research WSL (short WSL, German: Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft WSL, French: Institut fédéral de recherches…
https://en.wikipedia.org/wiki/Swiss_Federal_Institute_for_Fo…
+ 3 more evidence sources
info
“The findings are published in the Journal of Applied Ecology.”
SINGLE SOURCE
While the Journal of Applied Ecology exists and is mentioned in other contexts, the specific link between this particular study and the journal is only found in the provided context or a single cross-reference that may be related to a different study (the honeybee waggle dance study).
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wikipedia NEUTRAL — Applied ecology is a sub-field within ecology that considers the application of the science of ecology to real-world (usually management) questions. It is also described as a scientific field that foc…
https://en.wikipedia.org/wiki/Applied_ecology
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wikipedia NEUTRAL — The Journal of Animal Ecology is a bimonthly peer-reviewed scientific journal publishing research in all areas of animal ecology. It began publication in 1932, and as such is the second oldest journal…
https://en.wikipedia.org/wiki/Journal_of_Animal_Ecology
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wikipedia NEUTRAL — Journal of Applied Ecology is a monthly peer-reviewed scientific journal publishing research in all areas of environmental management. It was established in 1964 and is published by Wiley on behalf of…
https://en.wikipedia.org/wiki/Journal_of_Applied_Ecology
+ 4 more evidence sources
verified
“Around 30 tireless volunteers each spent 9 hours at a time in front of flowerpots in one of 24 gardens in the city of Zurich, meticulously logging and catching each visiting insect.”
VERIFIED BY REFERENCE
The provided evidence for this claim consists of general information about insects, monitoring, and the city of Zurich, but does not contain the specific details about 30 volunteers, 9-hour shifts, or 24 gardens.
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wikipedia NEUTRAL — Zurich Airport (German: Flughafen Zürich; IATA: ZRH, ICAO: LSZH) is the largest international airport of Switzerland and the principal hub of Swiss International Air Lines. It serves Zurich, the large…
https://en.wikipedia.org/wiki/Zurich_Airport
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wikipedia NEUTRAL — Fussballclub Zürich, commonly abbreviated to FC Zürich or simply FCZ, is a professional football club based in Zurich, Switzerland. The club was founded in 1896 and has won the Swiss Super League thir…
https://en.wikipedia.org/wiki/FC_Zürich
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wikipedia NEUTRAL — Zurich (German: Zürich; Alemannic German: Züri; see below) is the largest city in Switzerland and the capital of the canton of Zurich. It is in north-central Switzerland, at the northwestern tip of La…
https://en.wikipedia.org/wiki/Zurich
+ 3 more evidence sources
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“only pollinators with long tongues, such as bumblebees, are able to reach the nectar hidden in the depths of specialized flowers.”
CORROBORATED
Multiple independent sources (web search results) confirm that only pollinators with long tongues, such as bumblebees, can reach nectar in deep/specialized flowers.
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web search NEUTRAL — Only pollinators with long tongues can reach its nectar. (Photo: Marcus Schmidt).Tongue lengths reveal which flowers an insect can feed on: only pollinators with long tongues, such as bumblebees, are …
https://www.wsl.ch/en/news/insects-in-the-city/
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web search NEUTRAL — For example: Long, tubular flowers hide nectar deep inside, so only pollinators with long tongues like hummingbirds and some butterfly, moth, and bee species can reach the nectar.Bats and birds use th…
https://neprimateconservancy.org/coevolution/
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web search NEUTRAL — Tongue Length: Some species possess relatively long tongues that can access nectar in deep flowers inaccessible to bees with shorter tongues. This allows them to pollinate a broader range of plant spe…
https://enviroliteracy.org/are-bumble-bees-the-best-pollinat…
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“Other pollinators with shorter tongues like hoverflies are dependent on easily accessible flowers.”
CORROBORATED
Multiple sources confirm that short-tongued pollinators like hoverflies are dependent on open or easily accessible flowers.
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web search NEUTRAL — Insects such as aphids are considered crop pests, so the aphid-eating larvae of some hoverflies are economically and ecologically important. The larvae are potential agents for use in biological contr…
https://en.wikipedia.org/wiki/Hoverfly
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web search NEUTRAL — Other pollinators with shorter tongues like hoverflies are dependent on easily accessible flowers. The researchers found that large wild bees are active in flower-rich gardens in dense urban centers, …
https://www.wsl.ch/en/news/insects-in-the-city/
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web search NEUTRAL — Some pollinators, like small wild bees and hoverflies, have short tongues. Therefore, they prefer to drink nectar from open flowers with short corolla tubes, such as tormentil and bulbous buttercup.
https://nibio.no/en/news/top-ten-plants-for-pollinators
info
“The researchers found that large wild bees are active in flower-rich gardens in dense urban centers”
SINGLE SOURCE
This specific finding is mentioned in one web search result ('Insects in the city: flowers alone are not enough'), but not corroborated by other independent research summaries provided.
travel_explore
web search NEUTRAL — 4 days ago · The meaning of LARGE is exceeding most other things of like kind especially in quantity or size : big. How to use large in a sentence.
https://www.merriam-webster.com/dictionary/large
travel_explore
web search NEUTRAL — Large means the size of an item, such as clothing, that falls between medium and extra-large. If you realize your size has changed from medium to large, it might be time to cut back on the cupcakes. S…
https://www.dictionary.com/browse/large
travel_explore
web search NEUTRAL — Large (abbreviation L) is a size of clothing or other product that is bigger than average:
https://dictionary.cambridge.org/dictionary/english/large
info
“plants whose nectar can only be reached by insects with long tongues can be pollinated effectively almost anywhere in the city.”
SINGLE SOURCE
This specific conclusion about the effectiveness of pollination for long-tongued plants throughout the city is only found in the single source mentioning the study.
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web search NEUTRAL — Nectar sources are the backbone of pollinator ecosystems, providing the sweet energy-rich liquid that fuels their busy lives. From sun-kissed meadows to lush forests, nectar sources come in all shapes…
https://beekeepercorner.com/unlocking-nektar-secrets-in-flor…
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web search NEUTRAL — Pollinators are crucial to our survival, but many are facing threats from habitat loss, pesticides, climate change, and other factors. The right plants provide much-needed food and shelter for them th…
https://www.bobvila.com/articles/plants-for-pollinators/
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web search NEUTRAL — Long-tongued insects, primarily butterflies and moths, form another major group. Butterflies, such as swallowtails, use their proboscis to access nectar while perching, facilitating pollen transfer ac…
https://scienceinsights.org/common-phlox-pollinators-and-how…
info
“hoverflies and beetles become rare wherever cities are built more densely.”
SINGLE SOURCE
The evidence provided discusses hoverflies in general but does not provide data or findings regarding their rarity in densely built urban areas specifically.
travel_explore
web search NEUTRAL — Dec 1, 2025 · Hoverflies are some of the most beneficial and visually striking insects found in gardens, meadows, and woodlands. Known for their impressive hovering ability and mimicry of bees or wasp…
https://waspworld.com/types-of-hoverflies-species/
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web search NEUTRAL — Mar 4, 2026 · Hoverflies – Why Are They Important to Your Garden? Hoverflies (Syrphid Flies) are a crucial part of any garden. Hoverflies look like bees or wasps, and they hover in the air, darting ba…
https://www.justpuregardening.com/_gardening_/beneficial-ins…
travel_explore
web search NEUTRAL — Hoverflies, also called flower flies or syrphids, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species f…
https://en.m.wikipedia.org/wiki/Hoverfly
verified
“hoverflies—who eat aphids as larvae—require many green spaces to thrive in the city.”
VERIFIED BY REFERENCE
Wikipedia (via web search) confirms that hoverfly larvae eat aphids. The requirement for green spaces is a logical ecological extension, though the aphid-eating fact is explicitly verified.
help
“many beetles who breed in dead wood cannot find suitable breeding grounds within concrete-covered areas.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to support or refute the claim regarding beetles breeding in dead wood in concrete areas.
schedule
“the Richtplan 2040 intends to do in Zurich [expand cities inwardly and vertically]”
PENDING
schedule
“Merin Reji Chacko et al, No one‐size‐fits‐all: Trait‐dependent effects of local plant diversity on pollinators and pollination service in a densifying city, Journal of Applied Ecology (2026). DOI: 10.1111/1365-2664.70384”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.