Earth ChangesS

Fish

Corals upgrade algae to beat the heat

Image
© Jurgen Freund / Nature Picture Library / Rex FeaturesThis fan coral is in good health, and many of its relatives may stay healthy if they can upgrade their in-house algae.
In oceans around the world, heat-resistant algae are offering the prospect of a colourful future for corals. The reef-forming animals are upgrading their symbiotic algae so that they can survive the bleaching that occurs in waters warming under climate change.

"The most exciting thing was discovering live, healthy corals on reefs already as hot as the ocean is likely to get 100 years from now," says Stephen Palumbi of Stanford University.

Corals have a symbiotic relationship with tiny algae called zooxanthellae. The corals give the algae a home and, in exchange, the algae provide the corals with food. When water temperatures get too hot, the corals expel the algae. This is what is known as coral bleaching and it is expected to kill coral reefs around the world as global temperatures rise.

Magnify

Flashback Ancient Colony of Microbes Found Thriving Without Oxygen, Warmth or Light

Image
© AP Iron oxides stain the snout of the Taylor Glacier in Antarctica
An ancient colony of microbes thriving without oxygen, warmth or light beneath a rusty glacier has led scientists to re-evaluate what it takes for life to survive.

The bugs, believed to be descended from ocean-dwelling organisms, have evolved a unique ecosystem in a briny pool under 400 meters of ice.

There they have flourished for at least 1.5 million years, transforming sulfur and iron compounds to fuel their growth.

Bizarro Earth

Earthquake Magnitude 5.7 - Puebla, Mexico

Image
© US Geological Survey
Date-Time Friday, May 22, 2009 at 19:24:18 UTC

Friday, May 22, 2009 at 02:24:18 PM at epicenter

Location 18.347°N, 98.267°W

Depth 56 km (34.8 miles) set by location program

Region PUEBLA, MEXICO

Distances 75 km (45 miles) NW of Huajuapan de Leon, Oaxaca, Mexico
80 km (50 miles) S of Puebla, Puebla, Mexico

90 km (55 miles) W of Tehuacan, Puebla, Mexico

150 km (95 miles) SE of MEXICO CITY, D.F., Mexico

Arrow Down

Australia's Tasmanian devil declared endangered

Tasmanian devil
© Agence France-Presse/Torsten BlackwoodAustralia's Tasmanian devil, the world's largest surviving marsupial carnivore, will be listed as endangered because of a contagious and deadly cancer, the government said
Australia's Tasmanian devil, the world's largest surviving marsupial carnivore, will be listed as endangered because of a contagious and deadly cancer, the government said.

"This disease has led to the decline of about 70 percent of the Tasmanian devil population since the disease was first reported in 1996," Environment Minister Peter Garrett said in a statement.

Devil facial tumour disease, which is spread through biting, kills the animals usually within three months by growing over their faces and mouths, preventing them from eating.

Hourglass

Australia: Residents of Northern New South Wales told to flee floods

NSW Floods 1
© BOMLatest infrared satellite image from MTSAT-1R
Thousands of residents in northern New South Wales have been asked to evacuate, as the Clarence and Wilson Rivers threaten to flood surrounding towns.

At least 9,000 Grafton residents have been told to leave, with the town predicted to flood tonight.

However, there are differing reports about the number of residents being asked to evacuate, with the SES putting the figure at about 20,000.

Igloo

Australia: Tropical North Queensland Wakes To Coldest May Morning

Cooktown
© cairns.com.auCooktown - north of Cairns, Australia
Two far north Queensland towns have experienced their coldest May morning on record.

Cooktown, north of Cairns, was 10 degrees Celsius at 6:00am AEST - two degrees below its previous record low.

Fish

Contaminants In Marine Mammals' Brains

Image
© Eric MontieAtlantic white-sided dolphin and her calf.
The most extensive study of pollutants in marine mammals' brains reveals that these animals are exposed to a hazardous cocktail of pesticides such as DDTs and PCBs, as well as emerging contaminants such as brominated flame retardants.

Eric Montie, the lead author on the study currently in press and published online in Environmental Pollution, performed the research as a student in the Woods Hole Oceanographic Institution-MIT Joint Graduate Program in Oceanography and Ocean Engineering and as a postdoctoral fellow at the Woods Hole Oceanographic Institution (WHOI).

The final data analysis and writing were conducted at College of Marine Science, University of South Florida, where Montie now works in David Mann's marine sensory biology lab.

Sun

Who's to blame for winter that just won't end? Maybe it's a dastardly Russian plot

It was a dark and stormy night.

Ha ha ha! Just kidding. It was a dark and stormy afternoon. As hard as this is to believe, it was almost the end of (bad word) May.

Throughout the kingdom, the people were royally bummed out, partly because the economy was spinning slowly into the toilet, partly because everyone was terrified of catching a really nasty flu from pigs, but mainly because their land had been bewitched.

Once upon a time -- as all good stories are supposed to begin -- their kingdom was a place of warm and beautiful springs, the kind of springs you only read about in stories that begin with the words "once upon a time."

But now there was a darkness upon the land and their dreams of backyard barbecues and digging in the garden and going to the beach and baking their pasty white skin were being snowed under by The Winter That Refused To End.

Cloud Lightning

Heavy rains leave 11 dead in Haiti

Image
© Agence France-PresseHundreds of homes were flooded and dozens destroyed in the constant downpour. Some 40 percent of the southern city of Cayes was underwater, authorities said.
Several days of heavy rain has swamped Haiti and left 11 people dead across the poverty-seeped Caribbean nation, officials said Thursday.

"We have counted 11 deaths in four regions of the country since the beginning of the week," Alta Jean-Baptiste, director of Haiti's Civil Protection Agency, told AFP.

According to Jean-Baptiste, five people died in the department of Artibonite, whose main city Gonaives was left devastated last year by three successive hurricanes.

Hundreds of homes were flooded and dozens destroyed in the constant downpour. Some 40 percent of the southern city of Cayes was underwater, authorities said.

Better Earth

Magma pulses may reveal Earth's 'heartbeat'

Image
© Martin Rietze / WestEnd61 / RexEvidence from distant parts of Earth's crust suggests the core is pulsing, sending up a regular batch of magma to the surface.
Earth may have a heartbeat. Evidence from Hawaii and Iceland hints that the planet's core may be dispatching simultaneous plumes of magma towards the surface every 15 million years or so.

If the hypothesis is true, it would revolutionise our ideas of what's happening far below our feet. Independent scientists contacted by New Scientist were split, with some scornful and others intrigued.

Rolf Mjelde of the University of Bergen and Jan Inge Faleide of the University of Oslo, both in Norway, used seismological data to measure the thickness of Earth's crust between Iceland and Greenland. Iceland is on the Mid-Atlantic Ridge, where magma wells up to form fresh crust.