Canadian panel: Climate change is threat to polar bears from PhysOrg.com
(AP) — A scientific committee that advises Canada’s government on endangered species said Friday that climate change is a threat to the survival of the polar bear, but the species does not face extinction.
Narwhals more at risk to Arctic warming than polar bears from PhysOrg.com
(AP) — The polar bear has become an icon of global warming vulnerability, but a new study found an Arctic mammal that may be even more at risk to climate change: the narwhal.
Probing question: Why do whales beach themselves? from PhysOrg.com
Whales are the largest marine mammals in the world — the smallest species weigh in at several tons. When whales beach themselves, they can die simply from the crushing weight of their own bodies or from overheating due to their blubber, which is needed for insulation in cold ocean waters. What causes these often fatal incidents?
Ukraine marks 22nd anniversary of Chernobyl catastrophe from PhysOrg.com
Ukraine paid homage Saturday to victims of the Chernobyl nuclear catastrophe, a “planetary” drama as Kiev called it, 22 years after the world’s worst nuclear incident.
The warbler formed a ring species of interbreeding populations. These populations differed slightly in size, habitat, and calls/songs they use for communication and mating. When we reach the western and eastern Siberian warblers there song was so different that they don’t interbreed causing two separate species. “Molecular genetic data and consideration of preistolene climatological history indicate that the west Siberian and east Siberian forms of green warbler each result from northward expansions of southern forms along separate routes. (Irwin et al 2008)” The article takes a look at the evolution of calls and songs and what possible scenarios might have caused the variation.
When we think of invading exotic species you already have a negitive view in your mind. There is a high rate of negative publicity on exotic species. They are thought to be destructive, and can cause large amounts of stress and possible extinction of native species. This is a true statement when it comes to terrestrial or aquatic species, but what about marine? In this article John Briggs discusses the benefits, yes benefits, invasive species can have on marine environments….
At a time when the world’s top climate experts agree that carbon emissions must be rapidly reduced to hold down global warming, Italy’s major electricity producer, Enel, is converting its massive power plant here from oil to coal, generally the dirtiest fuel on earth.