The best of EcoWatch, right in your inbox. Sign up for our email newsletter!
Drifting Icebergs Cause Rapid Decline in Antarctica's Biodiversity
A once-rich habitat in the Antarctic has become an impoverished zone as icebergs—increasingly breaking free from the surrounding sea ice because of global warming—scour the shallow-water rocks and boulders on which a diversity of creatures cling to life.
Photo credit: Vincent van Zeijst via Wikimedia Commons
A report in the journal Current Biology says that researchers who carried out a survey dive in 2013 at Lagoon Island, off the West Antarctic Peninsula, discovered that “no live mega or macro-fauna can be found, the first time this has been observed there, despite being regularly visited by scientific divers since 1997”.
Dr. David Barnes, of the British Antarctic Survey, and colleagues report that boulders on the seabed near the Rothera research station had once been richly encrusted with creatures that competed for living space. Now such rocks might only support a single species.
Early Warning System
“The Antarctic Peninsula can be considered an early warning system, like a canary in a coal mine,” Barnes said. “Physical changes there are among the most extreme and the biology considered quite sensitive, so it was always likely to be a good place to observe impacts of climate change.”
“But impacts elsewhere are likely to be not too far behind. A lot of the planet depends on the near shore environment, not least for food. What happens there to make it less stable is important.”
Climate change has already begun to affect Antarctica in different ways. Researchers last year found that as icebergs broke free, the surviving ice shelf had begun to melt from underneath. The effect of the drifting icebergs was mixed: at depth in the fjords of the Peninsula, for instance, the species variety seemed to have got richer, according to one set of observations.
But no such effect was observed in the ocean shallows that are being scraped and scoured by drifting icebergs. The researchers say that although no species has disappeared entirely from the region, the numbers are so low as to be negligible.
In 2013, most of the observations seemed to involve just one opportunistic or pioneer species, a suspension feeder called Fenstrulina rugula. What had once been a rich habitat had become one of the simplest seabed systems to be found anywhere.
“Reduction of complex systems into very simple ones, where many (formerly important) species become too rare to maintain meaningful ecological roles, is a common reaction to anthropogenic disturbance such as overfishing, pollution, introductions of non-indigenous species and habitat destruction,” the report’s authors say.
“Across West Antarctica, the levels of these disturbances are among the lowest globally, apart from greenhouse contributions to climate change.”
The scientists conclude: “We expect the deeper seabed to become richer in benthic colonisation with more ice shelf collapses and fast ice losses, but hard surfaces in the shallows are likely to become deserts dominated by rapidly-colonising pioneers and responsive scavengers.”
EcoWatch Daily Newsletter
A dire new report issued by the World Meteorological Organization (WMO) found that the climate crisis is on a worrying trajectory as the crisis's hallmarks — sea level rise, ice loss and extreme weather — all increased over the last five years, which will end as the warmest five-year period on record.
By Peter Gleick
War is a miserable thing. It kills and maims soldiers and civilians. It destroys infrastructure, cultures and communities. It worsens poverty and development challenges. And it damages and cripples vital ecological and environmental resources.
Hundreds of activists gathered in the Swiss Alps on Sunday to mourn the loss of Pizol, a glacier that has steadily retreated over the last decade as temperatures have warmed the mountain tops, according to CNN.
Vice President Mike Pence sparked outrage on social media Saturday when he traveled in the first-ever motorcade to drive down the streets of Michigan's car-free Mackinac Island, HuffPost reported.
By Shawn Radcliffe
- As illnesses and deaths linked to vaping continue to rise, health officials urge people to stop using e-cigarettes.
- Officials report 8 deaths have been linked to lung illnesses related to vaping.
- Vitamin E acetate is one compound officials are investigating as a potential cause for the outbreak.
By Julia Conley
As organizers behind Friday's Global Climate Strike reported that four million children and adults attended marches and rallies all over the world — making it the biggest climate protest ever — they assured leaders who have been reticent to take bold climate action that the campaigners' work is far from over.