Newly discovered: walking sharks, Platypus on brink of extinction, Crab shells dissolving from ocean acidification, Marine works that can grow new brains and more…
Scientists have discovered four new species of walking sharks proving the ocean somehow can always seem a little more mysterious. According to a study published in the Marine and Freshwater Research journal on Tuesday, the Hemiscylliidae genus of sharks “walk” using their pectoral and pelvic fins to move across the ocean floor and live in coastal waters around northern Australia and the island of New Guinea. The scientists who authored the study say that walking sharks, also called “epaulette” sharks, are less than a meter long and feed on small fish and invertebrates.
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3. Pacific Ocean’s rising acidity causes Dungeness crabs’ shells to dissolve
The Pacific Ocean is becoming so acidic it is starting to dissolve the shells of a key species of crab, according to a new US study. Scientists found that the Dungeness crab, one of the most valuable species for recreational and commercial fisheries, is starting to weaken as its larvae are affected by rising ocean acidity. The study was published in the Science of the Total Environment academic journal and funded by the federal National Oceanic and Atmospheric Administration.
4. Marine heatwave linked to sharp increase in whale entanglements
Coast from 2014 to 2016 drove humpback whales into a narrow band of cooler water, leading to a dramatic increase in whale entanglements with crab-fishing gear, according to a new study. Researchers at the federal Southwest Fisheries Science Center examined the causes of the spike in whale entanglements off the West Coast in 2015 and 2016. They discovered that a large area of warm water, known as “the blob,” shrunk the suitable feeding habitat for humpback whales. The whales forage in cooler, nutrient-rich waters that support abundant populations of krill and anchovies.
5. The marine worms that can sprout new heads — including brains
Many species of marine ribbon worm have gained the power to regrow their heads — an unprecedented example of related animals independently mastering the trick of regeneration. Eduardo Zattara at the Smithsonian Institution’s National Museum of Natural History in Washington DC and his colleagues cut off the heads of individuals from 22 species of ribbon worm and observed that 5 species sprouted new heads. The researchers also found published accounts of 3 other species with this ability.
8. Spike in stranded dolphins – Great Britain
International conservation organizations have called on the government to ban supertrawlers from Irish waters due to an increase in the number of dolphins, porpoises, and whales being washed up on the coast, many with injuries that suggest they have been entangled in fishing nets. The deaths are said to coincide with the arrival of supertrawlers, giant vessels that target shoals of pelagic fish, near the surface but out at sea. There has been an increase in the number of common dolphins, harbor porpoises, pilot whales and striped dolphins being washed ashore each year, according to scientists.
Urban growth boundaries are created by A neural network-driven Earth system model has led University of California, Irvine oceanographers to a surprising conclusion: Phytoplankton populations in low-latitude waters will expand by the end of the 21st century. The unexpected simulation outcome runs counter to the longstanding belief by many in the environmental science community that global climate change will make tropical oceans inhospitable to phytoplankton, which forms the base of the aquatic food web. The UCI researchers provide evidence for their findings in a paper published today in Nature Geoscience.
More than 350 Amazon workers are speaking out about climate change, defying the company’s policy on making public comments about business activity. In a Medium post on Sunday night, 357 employees posted quotes critical of climate-related actions taken by the online retail giant. They said in a separate statement posted to Twitter that the quotes were to protest “Amazon’s newly updated external communications policy, which forbids employees from speaking about the company’s business without prior approval.”
Using the latest satellite technology from the European Space Agency (ESA), scientists from the University of Bristol have been tracking patterns of mass loss from Pine Island – Antarctica’s largest glacier. They found that the pattern of thinning is evolving in complex ways both in space and time with thinning rates now highest along the slow-flow margins of the glacier, while rates in the fast-flowing central trunk have decreased by about a factor of five since 2007. This is the opposite of what was observed prior to 2010.
17. Seabird ‘cops’ spy on sneaky fishing vessels
Sometimes fishing vessels vanish: Captains turn off beacons that broadcast their locations, leaving regulators wondering whether the boats are fishing illegally. Now, researchers have shown that albatrosses bearing small radar detectors can find these suspicious vessels—even in the middle of the open ocean. After a 6-month study with the large seabirds, the researchers estimate that more than one-third of vessels in the southern Indian Ocean are sailing undercover, confirming concerns about illegal or unreported fishing.