Streptopelia turtle doves and collared doves Patagioenas New World pigeons Ectopistes passenger pigeon DNA in old museum specimens is often degraded and fragmentary, and passenger pigeon specimens have been used in various studies to discover improved methods of analyzing and assembling genomes from such material. DNA samples are often taken from the toe pads of bird skins in museums, as this can be done without causing significant damage to valuable specimens. The English common name "passenger pigeon" derives from the French word passager, which means "to pass by" in a fleeting manner. In the 18th century, the passenger pigeon was known as tourte in New France in modern Canadabut to the French in Europe it was known as tourtre.
Frog Amphibians are becoming a vanishing species. There are a number of causes for them dieing. But the most recent and worst cause has been discovered. It is responsible for killing off our amphibians. They are dieing by the thousands. They were able to survive and hold on through past extinction spasms, surviving even when 95 percent of other animals died out.
They even stayed alive when the dinosaurs disappeared. If amphibians could live longer than dinosaurs, then why are they dieing now? The number one cause for our amphibians dieing is a form of fungal infection. This is not the first time this disease has been known to kill our amphibians.
Chytrid was wiping out amphibians in Costa Rica back in the s. But nobody knew it at the time. When frogs started dying in big numbers in Australia and Central America in the mids, scientists discovered the fungus was to blame.
Scientists think it may also perhaps be hampering oxygen xchange and control of water and salts in the body. Then the frog amphibian ends up dieing from the fungus.
But first the amphibian obviously suffers and spreads the fungus to all of the other frogs in the area. It is a vicious cycle that that likely will not end until all of our amphibians our extinct! Scientists believe the fungus came from African clawed frogs.
These frogs were exported widely for pregnancy tests beginning in the s. They may have been the initial carriers of the fungus. Chytrid is now reported on all continents where frogs live. That is in 43 countries and 36 U. The deadly fungus survives at elevations from sea level to 20, feet.
It does not just kill frogs either. The deadly Chytrid fungus also kills animals that are aquatic, land loving, and those that jump the line. It has affected at least species. Some of the species that are now gone from the wild are the Costa Rican golden toad, the Panamanian golden frog, the Wyoming toad, and the Australian gastric brooding frog.
That is only a few of the species named. There are said to be even more! Some scientists play down the importance of any single factor in overall declines.
But in an Australian researcher named Lee Berger believes that the chytridiomycosis fungus on frogs is the most spectacular loss of vertebrate biodiversity due to disease, in recorded history. Fogs really did survive while the dinosaurs became extinct.
After living that long you would think a frog could survive just about anything. Imagine some of the frogs the frogs that the scientists are finding dead from the fungus are old.
In fact there were two frogs recently found together. The female frog was dead. The male frog was not quite dead.
Scientists did everything they could to try and save the male frog. Sadly, the male spotted frog died despite all of their efforts to save him. After the male spotted frog died the scientists discovered that he was about forty-seven years old.
In my opinion that is quite a long time for a frog to live. Although I have not tudied the life spans of male spotted frogs. To think that the male spotted frog lived for at least forty-seven years is amazing. But then the male spotted frog was killed by the deadly spreading fungus of Chytridiomycosis.
Scientists are studying the dead frogs.+ free ebooks online.
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