Small insects attack and kill amphibians much bigger than themselves

May 20, 2011
This image shows the predation of amphibians by an adult Epomis beetle. Credit: Gil Wisen and Predation of amphibians by adult Epomis

New findings of researchers from Tel-Aviv University show that predator-prey interactions between ground beetles of the genus Epomis and amphibians are much more complex than expected. The study was published in the open access journal Zoo Keys.

"Amphibians are typical insect predators and their diet may include adult beetles, ground beetles in particular. The recently filmed successful attacks of the beetles on toads and frogs brought new insights on the amphibian-insect interactions, and documented the uncommon phenomenon of invertebrates preying on vertebrate animals," said the senior author Gil Wizen.

Previous research has shown that Epomis feed exclusively on amphibians and that this is essential for completion of their life cycle, while the diet of the adult beetles consists of terrestrial invertebrates as well as dead vertebrates. Wizen and Gasith's current study shows that adult Epomis beetles can prey upon live amphibians, in addition to their regular diet.

This video is not supported by your browser at this time.
Wizen and Gasith's current study shows that adult Epomis beetles can prey upon live amphibians, in addition to their regular diet. Credit: Gil Wizen and Avital Gasith

According to the study, the genus Epomis is represented in Israel by two species: E. dejeani and E. circumscriptus. In the central coastal plain these species have similar distribution but do not occur in the same sites. The researchers recorded Epomis sharing shelter with amphibians during the day, but preying on them during the night. In the laboratory, predation behaviour of the adult beetles on five amphibian species was observed: the Green Toad (Bufo viridis), the Savignyi's Frog (Hyla savignyi), the Levant Green Frog (Rana bedriagae), the Banded Newt (Triturus vittatus), and the Fire Salamander (Salamandra salamandra infraimmaculata). These observations showed that the diet of the two Epomis species overlaps only partially, with only one of the (E. dejeani) preying on the Banded Newt.

The results of this study serve as additional evidence that Epomis beetles, both larvae and adults, are specialized predators of amphibians. Moreover, these prey upon several .

Explore further: Orb-weaving spiders living in urban areas may be larger

add to favorites email to friend print save as pdf

Related Stories

Toad task force

Apr 06, 2011

An army of volunteers will be wading into ponds across the UK this spring to map the spread of a killer amphibian fungus.

The beetle's dilemma

Jun 26, 2007

Large jaws are efficient in crushing hard prey, whereas small jaws are functional in capturing elusive prey. Researchers have suggested that such trade-offs between “force” and “velocity” could cause ...

Recommended for you

Orb-weaving spiders living in urban areas may be larger

35 minutes ago

A common orb-weaving spider may grow larger and have an increased ability to reproduce when living in urban areas, according to a study published August 20, 2014 in the open-access journal PLOS ONE by Eli ...

User comments : 0