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High potential of Argentine ant to harm amphibian juveniles

Invasive species have major impacts on biodiversity and are one of the primary causes of amphibian decline and extinction. Unlike other top ant invaders that negatively affect larger fauna via chemical defensive compounds, the Argentine ant (Linepithema humile) does not have a functional sting. Nonetheless, it deploys defensive compounds against competitors and adversaries. Levels of ant aggression toward 3 native terrestrial amphibians were estimated by challenging juveniles in field ant trails and in lab ant foraging arenas. The composition and quantities of toxin in L. humile were measured by analyzing pygidial glands and whole?body contents. The mechanisms of toxicity in juvenile amphibians were examined by quantifying the toxin in amphibian tissues, searching for histological damages, and calculating toxic doses for each amphibian species. To determine the potential scope of the threat to amphibians, global databases were used to estimate the number, ranges, and conservation status of terrestrial amphibian species with ranges that overlap those of L. humile. Juvenile amphibians co?occurring spatially and temporally with L. humile die when they encounter L. humile on an ant trail. In the lab, when a juvenile amphibian came in contact with L. humile the ants reacted quickly to spray pygidial?gland venom onto the juveniles. Iridomyrmecin was the toxic compound in the spray. Following absorption, it accumulated in brain, kidney, and liver tissue. Toxic dose for amphibian was species dependent. Worldwide, an estimated 817 terrestrial amphibian species overlap in range with L. humile, and 6.2% of them are classified as threatened. These findings highlight the high potential of L. humile venom to negatively affect amphibian juveniles and provide a basis for exploring the largely overlooked impacts this ant has in its wide invasive range. informacion[at]ebd.csic.es: Álvarez-Blanco et al (2020) Effects of the Argentine ant venom on terrestrial amphibians. Conservation Biology DOI 10.1111/cobi.13604


https://conbio.onlinelibrary.wiley.com/doi/abs/10.1111/cobi.13604
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Content with tag amphibians .

High potential of Argentine ant to harm amphibian juveniles

Invasive species have major impacts on biodiversity and are one of the primary causes of amphibian decline and extinction. Unlike other top ant invaders that negatively affect larger fauna via...

The invasive red swamp crayfish increases infection of the amphibian chytrid fungus

Chytridiomycosis, caused by Batrachochytrium dendrobatidis (Bd), is considered one of the most important causes for the decline of amphibian populations worldwide. Identifying potential biological...

Iberian amphibians occupy higher mountain areas compared to the last century

extinctions. Amphibians are one of the most sensitive animal groups to climate change, currently undergoing a global decline. Predictive models for Europe and Iberian Peninsula forecast that the...

Eucalypt plantations disturb the development of amphibian larvae

Consequences of human actions like global warming, spread of exotic species or resource consumption are pushing species to extinction. Even species considered to be at low extinction risk often...

Macroevolutionary shift in the size of amphibian genomes and the role of life history and climate

Genome size varies enormously from one species to another, and amphibians are the group of vertebrates where genome size varies the most. Amphibians are also really old lineages that have been...
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