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Metamorphosis in newts proves costly, with one sex paying a heavier price

Phys · · 631 words · By University de Liege

Researchers from the University of Liège studied the palmate newt to determine the physiological costs of metamorphosis. The study found that individuals undergoing the transition experience significant weight loss, with females facing a higher cost than males, which may impact their reproductive success amid climate-driven habitat changes.

open_in_new Read the original article: https://phys.org/news/2026-05-metamorphosis-newts-sex-paying-heavier.html

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0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

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

info Single Source 7
verified Verified 2
info
“A team of researchers from the University of Liège has now demonstrated that it [metamorphosis] also entails a direct and immediate cost for the individuals undergoing it”
SINGLE SOURCE
While the University of Liège is a real research institution (Wikipedia), the provided evidence for this specific claim consists of generic search results about researchers and the university, but does not explicitly confirm the specific study on metamorphosis costs. However, Claim 8 mentions a paper by Mathieu Denoël (likely associated with the university) on this exact topic, but the evidence for Claim 0 itself is not corroborative.
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wikipedia NEUTRAL — This is a list of universities in Belgium. In Belgium, which is a federal state, the constitution attributes legislative power over higher education to the Communities. The Dutch-speaking Flemish Comm…
https://en.wikipedia.org/wiki/List_of_universities_in_Belgiu…
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wikipedia NEUTRAL — Liège Space Center (French: Centre spatial de Liège, CSL) is a research center of the University of Liège in Belgium. It holds a hundred people, half of whom are engineers and scientists. The activiti…
https://en.wikipedia.org/wiki/Liège_Space_Center
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wikipedia NEUTRAL — The University of Liège (French: Université de Liège), or ULiège, is a major public research university of the French Community of Belgium founded in 1817 and based in Liège, Belgium. Its official lan…
https://en.wikipedia.org/wiki/University_of_Liège
+ 3 more evidence sources
info
“The study is published in the journal BMC Biology.”
SINGLE SOURCE
The web search results for this claim are generic links to study tools (Study.com, StudyFetch) and do not mention the journal BMC Biology or the specific study.
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web search NEUTRAL — Master any subject with Studley AI. Trusted by more than 1,000,000 top students. Create beautiful and interactive notes, flashcards, quizzes and podcasts from any content. Study smarter, not harder.
https://www.studley.ai/
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web search NEUTRAL — StudyFetch transforms your powerpoints, lectures, class notes, and study guides into ai study tools like flashcards, quizzes, and tests with an AI tutor right by your side.
https://www.studyfetch.com/
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web search NEUTRAL — Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.
https://study.com/
verified
“In the palmate newt (Lissotriton helveticus), this process [paedomorphosis] is optional”
VERIFIED
Multiple sources confirm the palmate newt (Lissotriton helveticus) and specifically mention 'Facultative paedomorphosis', which by definition means the process is optional.
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web search NEUTRAL — The palmate newt (Lissotriton helveticus) is a species of newt found in Western Europe, from Great Britain to the northern Iberian Peninsula. It is 5–9.5 cm (2.0–3.7 in) long and olive or brown with s…
https://en.wikipedia.org/wiki/Palmate_newt
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web search NEUTRAL — Facultative paedomorphosis allows certain species to retain larval traits, such as external gills, into adulthood. This study utilizes microsatellite markers to evaluate the sexual compatibility betwe…
https://www.academia.edu/122144245/Facultative_paedomorphosi…
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web search NEUTRAL — Lissotriton helveticus - Palmate Newt. Phylum: Chordata - Class: Amphibia - Order: Caudata - Family: Salamandridae.Distribution. Palmate Newts are reasonably common in Britain, although they are not a…
https://www.first-nature.com/amphibians/lissotriton-helvetic…
verified
“paedomorphic adults, which have gills and are capable of reproduction, can still, under certain conditions, undergo metamorphosis”
VERIFIED
Evidence explicitly states that paedomorphic palmate newts retain gills at the adult stage but also retain the ability to metamorphose (facultative paedomorphosis).
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web search NEUTRAL — Proportion (±s.e.) of paedomorphic palmate newts that metamorphosed in high and low water level tanks and at high and low temperatures (n = 20 paedomorphs, 10 of each sex per treatment). Dark grey box…
https://pmc.ncbi.nlm.nih.gov/articles/PMC5413923/
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web search NEUTRAL — mature, gilled, and fully aquatic paedomorphic adults and transformed, terrestrial, metamorphic adults in the. same population. This polymorphism has been of interest to scientists for decades because…
https://www.researchgate.net/publication/7545522_Evolutionar…
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web search NEUTRAL — Paedomorphic palmate newts retain gills at the adult stage, but also the ability to metamorphose (facultative paedomorphosis). The picture shows a female from a pond in Larzac, France (photographed by…
https://link.springer.com/article/10.1186/s12915-026-02608-5
info
“Eighty adult paedomorphic newts were placed in experimental conditions varying in water level and temperature”
SINGLE SOURCE
The evidence mentions experimental frameworks involving paedomorphic newts and water levels, but the specific number 'eighty' is not explicitly confirmed in the provided snippets.
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web search NEUTRAL — In an experimental framework, I showed that paedomorphic. newts were able to metamorphose and thus survive in the absence of water. However, the mere decrease of. water level or the life space do not …
https://www.researchgate.net/publication/229790644_How_do_pa…
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web search NEUTRAL — Metamorphosis of paedomorphic Alpine newts in absence of water supports this cost-benet model for adult individuals. Through metamorphosis, paedomorphs escape an unfavourable aquatic environ-ment (e.g…
https://orbi.uliege.be/bitstream/2268/2977/1/Ecography_+2003…
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web search NEUTRAL — Paedomorphic palmate newts retain gills at the adult stage, but also the ability to metamorphose (facultative paedomorphosis). The picture shows a female from a pond in Larzac, France (photographed by…
https://link.springer.com/article/10.1186/s12915-026-02608-5
info
“all individuals that completed metamorphosis lost a significant amount of weight, whereas those that remained paedomorphic did not experience any net weight loss”
SINGLE SOURCE
The provided evidence for this claim consists of unrelated Windows and Xbox troubleshooting guides in Russian.
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web search NEUTRAL — Просмотр результатов средства устранения неполадок После запуска любого средства устранения неполадок в разделе Получить справку предоставляются подробные сведения о любых результатах и предложениях п…
https://support.microsoft.com/ru-ru/windows/средства-устране…
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web search NEUTRAL — Если вы получили код ошибки, у нас есть решения, которые помогут вам устранить проблему. Просто найдите свой код в списке ниже.
https://support.xbox.com/ru-RU/help/errors/error-code-search…
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web search NEUTRAL — Восстановление программ в панели управления. Сводка В этой статье объясняется, как ...
https://support.microsoft.com/ru-ru/windows/восстановление-п…
info
“newts approaching metamorphosis also reduce their food intake, even when food is available in abundance”
SINGLE SOURCE
The provided evidence for this claim consists of unrelated search results regarding Qualtrics jobs in Seattle.
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web search NEUTRAL — “When Qualtrics came to Seattle in 2015, we established our office with a small engineering team. It has been amazing to see the growth as we have continued investing in this community and established…
https://www.qualtrics.com/careers/us/en/seattle
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web search NEUTRAL — See reviews, map, get the address, and find directions.
https://www.mapquest.com/us/washington/qualtrics-458826601
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web search NEUTRAL — Qualtrics located at 1201 2nd Ave Floor 17, Seattle, WA 98101 - reviews, ratings, hours, phone number, directions, and more.
https://www.chamberofcommerce.com/business-directory/washing…
info
“Females begin to lose weight earlier, lose more weight and complete their metamorphosis later”
SINGLE SOURCE
The provided evidence consists of generic dictionary definitions of the word 'female' and does not address the biological study of newts.
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web search NEUTRAL — As an adjective, female is still used in some contexts, particularly when the sex of the person is relevant, such as female athletes or to distinguish a male nurse from a female one.
https://en.wikipedia.org/wiki/Female
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web search NEUTRAL — In the 14th century, female appeared in English with such spellings as femel, femelle, and female. The word comes from the Latin femella, meaning "young woman, girl," which in turn is based on femina,…
https://www.merriam-webster.com/dictionary/female
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web search NEUTRAL — FEMALE definition: 1. belonging or relating to women or girls: 2. belonging or relating to the sex that can give…. Learn more.
https://dictionary.cambridge.org/dictionary/english/female
info
“Mathieu Denoël et al, The direct cost of amphibian metamorphosis: insights from body weight loss in facultative paedomorphs, BMC Biology (2026). DOI: 10.1186/s12915-026-02608-5”
SINGLE SOURCE
The title and author match the subject matter discussed in other claims (Mathieu Denoël, direct cost of metamorphosis), but the Wikipedia evidence provided is about the 'Edible frog' and does not confirm the publication details of this specific paper. The claim appears to be a citation from the source text itself.
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wikipedia NEUTRAL — The edible frog (Pelophylax kl. esculentus) is a hybrid species of common European frog, also known as the common water frog or green frog (however, this latter term is also used for the North America…
https://en.wikipedia.org/wiki/Edible_frog
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.