Showing posts with label fanged frog. Show all posts
Showing posts with label fanged frog. Show all posts

Thursday, 1 January 2015

New fanged frog 'gives birth to tadpoles'

By Jonathan WebbScience reporter, BBC News
For the first time, frogs have been seen giving birth to tadpoles.

Most frogs lay eggs and although some species give birth to froglets, newborn tadpoles are new to science.

This species of fanged frog lives on Sulawesi Island in Indonesia, and zoologists had chased it for decades because they suspected it would show this unique behaviour.

An international team has now described it for the first time, in a study published in the journal Plos One.

Dr Jim McGuire from the University of California, Berkeley, actually thought he was holding a male frog the first time he witnessed a birth.

In fact, he had in his hands a pregnant female and, suddenly, a clutch of brand new tadpoles.

Read on ...

Monday, 8 August 2011

Without Competition, Island Frogs Evolve Rapidly

ScienceDaily (Aug. 1, 2011) — Scientists led by Ben Evans of McMaster University have documented the rapid evolution of new fanged frog species on the island of Sulawesi, near the Philippines.


The team found 13 species of fanged frog on the island, nine of which hadn't previously been described. The species differ in body size, amount of webbing in their feet, and even how they raise their young -- all in accordance with the demands of their distinct ecological niches. Sulawesi has the same number of fanged frog species as the Philippine archipelago.


"We would expect to find more species on the archipelago because it's so much larger, but that's not the case," Evans said.

Why such diversity on the smaller island? There's less competition on Sulawesi, the researchers say. Fanged frogs in the Philippines have to compete with another genus of frogs, Platymantis. Platymantis never made to hop over to Sulawesi, leaving the fanged frogs free to spread out into new habitat niches, to which they eventually adapted. The rapid evolution of these frogs is a striking example of adaptive radiation -- a concept Charles Darwin famously recorded in Galapagos finches.

The research appears in the American Naturalist
http://www.sciencedaily.com/releases/2011/07/110727164711.htm

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