extinction

U.S.: Climate change driving California native Freshwater fish species to extinction

Eighty two percent of native freshwater fish species in California, including salmon, are likely to become extinct on present trends within the next century due to climate change, reports a study lead by Professor Peter Moyle from University of California Davis.

U.S.: Frogs, Salamanders, turtles declining rapidly due to climate change and habitat loss

Cascades Frog, Rana cascadae, James Bettaso, USFWS.Cascades Frog, Rana cascadae, James Bettaso, USFWS.A recent study revealed amphibian declines are occurring much more rapidly and more widespread than expected in species populations across the United States, even in protected national parks and wildlife refuges.

"This new study confirms that our country's amphibians are facing an extinction crisis that demands aggressive action to tackle threats like habitat destruction and climate change," said Collette Adkins Giese, a Center for Biological Diversity biologist and attorney focusing on protection of amphibians and reptiles. "Scientists have known for a long time that frogs, toads and salamanders are in big trouble, but the declines this study documents are surprising and disturbing."

Guy McPherson on the end of the world

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Tropical insects face catastrophic reduction in reproduction with climate change

It looks like cold blooded species (ectotherms) in the tropics could be at an extreme risk of extinction with just moderate increases in temperature according to scientific studies. The latest study looked at the effects of increased temperature on the entire life cycle of one tropical ectotherm species, suggesting reproduction may suffer a catastrophic reduction as the climate warms with just moderate increases in tropical temperatures. The research has possible ramifications for all tropical ectotherms - Insects, spiders, frogs, snakes, turtles and other reptiles.

This is not the first indication that global warming impact on tropical species is greater than expected. Small increases in temperature in tropical ecosystems can have large impacts as many species are already near their thermal physiological maximum. Many species also have small dispersal ranges which increases their risk of extinction through small changes in habitat or environment.

Ocean acidification increasing at unprecedented rate not seen in last 300 million years

In a new study marine scientists warn that the rate of ocean acidification presently occurring is unprecedented in the last 300 million years. This is due to dissolving carbon dioxide from the atmosphere, much of which human activity has contributed over the last 200 years through the use of fossil fuels. The extent of the acidification and rate of acidification enhances the prospect for a mass marine extinction event this century.

Related: Dec 2011 - Ocean acidification warning to Durban climate negotiators to act on reducing CO2 emissions | June 2011 - Oceans at high risk of unprecedented Marine extinction scientists warn | April 2010 - Paleo-perspectives on ocean acidification - marine ecosystems under threat | Feb 2010 - Marine Extinction looms with Ocean Acidification increasing

Oceans at high risk of unprecedented Marine extinction scientists warn

A report issued last week from the International Programme on the State of the Ocean (IPSO) has strongly warned of the damage to the health of the world's oceans and marine life from several factors including the impacts of climate change. The report warned that if the current business as usual trajectory of damage continues "that the world's ocean is at high risk of entering a phase of extinction of marine species unprecedented in human history."

Related: International Programme on the State of the Ocean (IPSO) | The Ocean in a high CO2 world | Frontline - World's oceans in crisis: What can be done? | Takver: articles on climate change and oceans | NOAA: Major flooding on the Mississippi river predicted to cause largest Gulf of Mexico dead zone ever recorded

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