University of Adelaide researchers have for the first time demonstrated that the ocean acidification expected in the future will reduce fish diversity significantly, with small ‘weedy’ species dominating marine environments. Published today in Current Biology, the researchers studied species interactions in natural marine environments at underwater volcanic vents, where concentrations of CO2 match those predicted for oceans at the end of the century. They were compared with adjacent marine environments with current CO2 levels.
The six ocean hot spots that teem with the biggest mix of species are also getting hit hardest by global warming and industrial fishing, a new study finds. An international team looked at more than 2,100 species of fish, seabirds, marine mammals and even tiny plankton to calculate Earth’s hot spots of marine biodiversity.
POINT JUDITH, R.I. — There was a time when whiting were plentiful in the waters of Rhode Island Sound, and Christopher Brown pulled the fish into his long stern trawler by the bucketful. “We used to come right here and catch two, three, four thousand pounds a day, sometimes 10,” he said, sitting at the wheel of the Proud Mary — a 44-footer named, he said, after his wife, not the Creedence Clearwater Revival song — as it cruised out to sea.
New restrictions on U.S. seafood imports, which will require seafood to be harvested in accordance with the U.S. Marine Mammal Protection Act (MMPA), will likely offer significant marine conservation benefits on a global scale. In this Policy Forum, Rob Williams et al. highlight the impacts and challenges involved in this endeavor. The U.S. is the largest importer of seafood in the world, accepting marine catches from more than 120 countries. Best case scenario, countries will comply and marine species will benefit from improved protection. Worst case, countries could suffer economically from not being able to export to the US, and/or choose not to comply.
A geological expedition to the southwest Indian Ocean in November 2011 made a highly unusual find, at least insofar as its own stated goals: six new species of underwater creatures that had never been seen before. A team of researchers, led by Jon Copley of the University of Southampton used a remotely operated vehicle to explore the area the size of a football field at a site called Longqi, or Dragon’s Breath, which is about 1,200 miles southeast of Madagascar and about 2 miles below the ocean surface. Longqi is home to a number of hydrothermal vents, where heat escaping from below the ocean floor attracts a diverse range of deep sea creatures.
A deep sea octopod, dubbed “Casper” after the film ghost because of its appearance, could be at risk from mining, scientists say. The animal, possibly a new species, was discovered last spring at depths of more than 4,000 metres (2.5 miles). Studies suggest females nurture their eggs for several years on parts of the seabed that contain valuable metals.
The tsunami of 2011 is well remembered in Japan. Some towns have recovered, while others struggle to return to a life that once was. The same is true for ecosystems. In a new study in PLOS ONE, Japanese researchers report how the sea life in different coastal regions of Japan struck by the tsunami have flourished or faltered. “We watched in real time an ecosystem recover from a large natural disaster,” said Reiji Masuda, who directs the Maizuru Fisheries Research Station at Kyoto University and led the study. “We could observe how species recovered and whether any invading species could thrive.”
Seaweed-eating fish are becoming increasingly voracious as the ocean warms due to climate change and are responsible for the recent destruction of kelp forests off the NSW north coast near Coffs Harbour, research shows. The study includes an analysis of underwater video, covering a 10-year period between 2002 and 2012, during which the water warmed by 0.6 degrees. “Kelp forests provide vital habitat for hundreds of marine species, including fish, lobster and abalone,” says study first author Dr Adriana Vergés of UNSW and the Sydney Institute of Marine Science.
Six new animal species have been identified at deep-sea vents beneath the Indian Ocean. The remote area is home to life not seen elsewhere in the world’s oceans, yet has been earmarked for future mineral exploration. Hydrothermal vents form at locations where seawater meets magma. They are surrounded by a large number of organisms that are new to science. The latest finds include worms, snails and a crab.
Graduate student Paul Gonzalez at Stanford University’s Hopkins Marine Station recently became a hunter, breeder and farmer of a rare marine worm, all to fill in a considerable gap in our understanding of how animals develop. He knew that some animals go through a long larval stage, a developmental strategy known as indirect development, and this rare worm was his chance to better understand that process.
Coral across Australia’s Great Barrier Reef has suffered its most devastating die-off on record, a new report says.
(From CNN / by Ben Westcott)– In just nine months, bleaching caused by warmer water has killed around 67% …
Scientists studying naturally high carbon dioxide coral reefs in Papua New Guinea found that erosion of essential habitat is accelerated in these highly acidified waters, even as coral growth continues to slow. The new research by the University of Miami Rosenstiel School’s Cooperative Institute for Marine and Atmospheric Studies (CIMAS), NOAA, and the Australian Institute of Marine Science has important implications for coral reefs around the world as the ocean become more acidic as a result of global change.
