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Tag: "vertebrate" at biology news

How fish conquered the ocean

...used Bayesian analysis to examine the evolution of vertebrate yolk protein (vitellogenin) genes in relation to the "Three round hypothesis" of whole genome duplication among vertebrates, and the functional end points of the vitellogenin fractional degradation during the final stages of oogenesis, a period that ...

'Terror bird' arrived in North America before land bridge, study finds

...h and South America," said MacFadden, a curator of vertebrate paleontology at the Florida Museum of Natural History at UF. "But the rare earth element analysis of a fossil Titanis bone from Texas determines its age to be 5 million years old. This shows that the bird arrived 2 million years before the land bridg...

The origin of the brain lies in a worm

...aboratory (EMBL) in Heidelberg now reveal that the vertebrate nervous system is probably much older than expecte...d by zoologist Anton Dohrn in 1875. It states that vertebrate and annelid CNS are of common descent and vertebrates have turned themselves upside down throughout ...

Stem cell transplants explored at Stanford as a possible treatment for hearing loss

... program for regeneration exists somewhere in the vertebrate family," Heller said. "We know there is an unknown signal to regenerate that we could use, but we first have to find it." The idea of using drug therapy to cure deafness has been at the back of Heller's mind since he began researching the inner...

Climate change could trigger 'boom and bust' population cycles leading to extinction

...tions will build up most rapidly, noted Wilmers, a vertebrate conservation ecologist. Dramatic population fluctuations make species more vulnerable to extinction due to disease, inbreeding, and other causes; in addition, each crash reduces the genetic diversity of a species, lowering its ability to adapt and ma...

Amphibians in losing race with environmental change

...have been some of the most adaptive and successful vertebrate animals on Earth. They were around before the dinosaurs, have lived in periods with very different climates, and continued to thrive while many other species went extinct. But right now, they just can't keep up." It has been estimated that the rat...

How to look at dinosaur tracks

... on these invaluable impressions. “Well-preserved vertebrate tracks in the rock record can be an invaluable source of information about foot morphology, soft tissue distribution, and skin texture,?write Jesper Milàn (Geological Institute, University of Copenhagen) and David B. Loope (Department of Geosciences,...

The insect vector always bites twice

...ected when it feeds, taking blood from an infected vertebrate host. The pathogenic agent finds conditions to reproduce and proliferate in the vector’s body. In most cases, the parasite moves back into the vector’s salivary glands in order to be transmitted to the human host when the insect bites again to take a...

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