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Australia offers cash for Great Barrier Reef rescue ideas
by Staff Writers
Sydney (AFP) Jan 16, 2018


Most sea turtles now female in north Great Barrier Reef
Miami (AFP) Jan 8, 2018 - The vast majority of green sea turtles in the northern Great Barrier Reef are now female because of warmer temperatures due to climate change, which influences their sex during incubation, researchers said Monday.

The population of about 200,000 nesting females in the area along the east coast of Queensland, Australia, is one of the largest in the world, and could crash without more males, according to the report in the journal Current Biology.

The temperature at which eggs incubate determines the sex of the eggs. Warmer nests, which are dug into beaches, mean more females. Just a few degrees can mean the difference between a balanced and skewed sex ratio.

"With average global temperature predicted to increase 4.7 Fahrenheit (2.6 Celsius) by 2100, many sea turtle populations are in danger of high egg mortality and female-only offspring production," said the report.

Since figuring out the sex of buried eggs is too difficult, researchers decided to catch sea turtles and use genetic tests to find out where they'd come from.

They worked in an area where two different populations of green sea turtles (Chelonia mydas) forage -- one from a warmer area and the other from a cooler area.

After collecting 411 for analysis and release, they found a "moderate female sex bias" in turtles from beaches in the cooler, southern Great Barrier Reef, where about 65-69 percent were female.

But those in the warmer, northern Great Barrier Reef were "extremely female-biased," at 99.1 percent female among juveniles and 99.8 percent for those between juveniles and adults.

A total of 86.8 percent of adult-sized turtles from the area were female.

The trend of producing more females in warm areas has been ongoing for more than two decades, according to lead author Michael Jensen, from the US National Oceanic and Atmospheric Administration.

The study "provides a new understanding of what these populations are dealing with," he said.

"Knowing what the sex ratios in the adult breeding population are today and what they might look like five, 10 and 20 years from now when these young turtles grow up and become adults is going to be incredibly valuable."

Experts say there are strategies that could help, including erecting shady tents over beaches where turtles nest to keep them cool.

Green sea turtles are considered endangered throughout much of the world, under siege from coastal debris, loss of habitat, fishing nets and pollution, according to the International Union for Conservation of Nature.

Australia is calling on the world's top scientific minds to help save the Great Barrier Reef, offering hundreds of thousands of dollars to fund research into protecting the world's largest living structure.

The UNESCO World Heritage-listed reef is reeling from significant coral bleaching due to warming sea temperatures linked to climate change.

The 2,300-kilometre (1,400-mile) site is also under pressure from farming runoff, development and predatory crown-of-thorns starfish, with experts warning it could be suffering irreparable damage.

On Tuesday, the Australian government announced a Aus$2.0 million (US$1.6 million) funding pot available to people with bright ideas on how to save the reef.

"The scale of the problem is big and big thinking is needed, but it's important to remember that solutions can come from anywhere," said Environment Minister Josh Frydenberg.

He said the money would be available to the world's "greatest scientific minds, industry and business leaders, innovators and entrepreneurs".

"Solutions could focus on anything from reducing the exposure of corals to physical stressors, to boosting coral regeneration rates by cultivating reef-building coral larvae that attract other important marine species," Frydenberg added.

Up to Aus$250,000 is available for an initial feasibility stage, where researchers can test the technical and commercial viability of their proposals for up to six months.

More than one proposal is expected to be accepted at this stage, the government said.

A further Aus$1 million will then be made available to the best solutions at the proof of concept stage, where applicants develop and test their prototypes for up to 12 months.

Those that are successful will retain intellectual property rights and will be able to try to commercialise their innovation.

UNESCO's World Heritage Committee last year decided not to place the Barrier Reef on its list of sites "in danger" despite concern over the mass coral bleaching.

The 2017 bleaching marked the second-straight year that corals have been damaged by warming sea temperatures, an unprecedented occurrence that scientists said would give the invertebrate marine creatures insufficient time to fully recover.

Coral reefs make up less than one percent of Earth's marine environment, but are home to an estimated 25 percent of ocean life, acting as nurseries for many species of fish.

WATER WORLD
Sea levels off Dutch coast highest ever recorded in 2017
The Hague (AFP) Jan 13, 2018
Storm surges and tidal cycles caused record sea levels along the coast of the Netherlands last year, a Dutch marine institute has found. "The level has been rising gradually since 1890 by about 0.2 cm per year due to the melting of the ice and the warming up of the ocean," expert Fedor Baart, of the research organisation Deltares, said in a statement Friday. "That means that, as a rule, ... read more

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