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Tag: "frog" at biology news

A frog's life is food for thought

...periods of starvation, the green-striped burrowing frog is able to absorb nutrients 40 percent more effect...in why animals such as the green-striped burrowing frog are able to gorge themselves on huge meals without overwhelming their digestive system. "Nothing wa...

Scientists discover that three overlapping signals in embryo help get the backbone right

.... Now, using very young embryos of the laboratory frog Xenopus tropicalis, Khokha, Harland and their UC B...more than one, and chose to work in embryos of the frog Xenopus tropicalis, a close relative of the more common laboratory frog Xenopus laevis. X. tropicali...

Roundup®highly lethal to amphibians, finds University of Pittsburgh researcher

...ent decline in the total mass of tadpoles. Leopard frog tadpoles and gray tree frog tadpoles were completely eliminated and wood frog tadpoles and toad tadpoles were nearly eliminated....

A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs

... At the edge of Ocelot Pond, Panama, red-eyed tree frog embryos still in their eggs are about to make a li... the embryos to hatch. Undisturbed, red-eyed tree frog eggs usually hatch six to eight days after fertilization, but can hatch up to 30 percent earlier if ...

Insight into our sight: A new view on the evolution of the eye lens

... regions of the sea squirt gene are transferred to frog embryos, these regulatory elements drive gene expression in the tadpoles' own visual system, including the lens. This strongly suggests that prior to the evolution of the lens, there was a regulatory link between two tiers of genes: those that would ...

Picky female frogs drive evolution of new species in less than 8,000 years

...er two isolated populations of the green-eyed tree frog reestablished contact less than 8,000 years ago an...that is unable to mate with either of the original frog populations. This example suggests that rapid speciation is often driven by recontact between long-...

New amphibian species result from exploration, not from rule changes

...sions after examining genetic data on a Madagascan frog family, the Mantellidae, that grew from 143 to 203 species between 1992 and 2003. The investigators compared the sequence of a particular mitochondrial gene in mantellid species recognized at various times from the 19th century to the present. The ge...

Frog’s ear canal may provide insights for understanding human hearing loss

A rare frog that lives in rushing streams and waterfalls in ea... in the journal Nature. Attributes that enable the frog to hear ultrasounds are made possible by the presence of an ear canal, which most other frogs don't ...

Clawed frog helps Fanconi anemia research make leaps

A large, clawed frog is helping Oregon Health & Science University researchers gather a princely sum of knowledge on Fanconi anemia, a rare, genetic, cancer-susceptibility syndrome. Scientists in the OHSU School of Medicine's Department of Biochemistry and Molecula...

Laos ?a lost world for frogs

...life Conservation Society, which says that six new frog species have been found by scientists over a two-year period. Working in conjunction with the WCS Laos Program, scientists describe the latest three species in the recent issue of Copeia, the journal of the American Society of Herpetologists and Ic...

Forsyth scientists gain greater understanding of how embryos differentiate left from right

...f this pump during the first few cell cleavages in frog embryos. H+-flux across plasma membranes is thus asymmetric at the four- and eight-cell stages, and this asymmetry requires H+-V-ATPase activity. Artificially equalizing the asymmetry in H+ flux, by increasing or decreasing it on both sides equally, ...

Rare Chinese frogs communicate by means of ultrasonic sound

First came word that a rare frog (Amolops tormotus) in China sings like a bird, the...nced Science and Technology, was introduced to the frog species by Kraig Adler, a Cornell University biologist who had learned about it while conducting a s...

Climate change drives widespread amphibian extinctions

...of an infectious disease that is wiping out entire frog populations and driving many species to extinction...oud forests, for example, the Monteverde harlequin frog disappeared in the late 1980s, as did the golden toad, whose much-publicized extinction, said Pounds...

Poison dart frog mimics gain when birds learn to stay away

...ty of Texas at Austin uncovered a new way that the frog species can evolve to look similar, and it hinges ... and Molly Cummings show that a harmless, colorful frog living in the Amazonian rainforest gets protected from predators not by mimicking its most poisonous...

First surveys of Tanzanian mountains reveal 160+ animal species, including new & endemic

...ver 160 animal species--including a new species of frog and eleven endemic species--according to an articl...est Conservation Group discovered a new species of frog (Arthroleptis nikeae) hiding among the leaf litter under the forest canopy. The smooth-skinned, brow...

Cultural transmission in bats: When listening for dinner, bats learn from their neighbors

...--researchers have demonstrated that bats that use frog acoustic cues to find quality prey can rapidly lea... The fringe-lipped bat, Trachops cirrhosus, uses frog calls from different species as acoustic cues to assess the palatability of its prey. Previous exper...

Time of day tempers tadpoles' response to predators

...phis, Tenn. Fraker studied tadpoles of the green frog (Rana clamitans), which normally feed more at nigh...agonfly larvae differed with time of day. "Green frog tadpoles, like many other aquatic animals, assess predation risk indirectly by sensing chemicals rel...

Colombian frog believed extinct found alive

... found surviving members of a species of Harlequin frog believed extinct due to a killer fungus wiping out...f what could be the last population of the painted frog (Atelopus ebenoides marinkellei) indicates the species has survived the fungus, providing hope that ...

Study shows frogs can play key role in stem cell research

... in wildlife documentaries, but the African clawed frog could prove a powerful ally for scientists working...r from amphibians. But, because the African clawed frog is easier to study than mice and humans, the Edinburgh team anticipate that it will become an import...

Leptin found to control appetite and limb development in frogs

... cold-blooded vertebrate, the South African clawed frog Xenopus. As it does in humans and other mammals, leptin acts on the frog brain to suppress appetite. But the hormone also seems to play a role in the complex signaling that ...

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