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Global warming changing Australian seaweed communities

Kelp in Hazards Bay, Freycinet National Park, Tasmania, Australia. Photo courtesy Bjørn Christian Tørrissen, via the Creative Commons.

Many species likely to become extinct

By Summit Voice

SUMMIT COUNTY — Some seaweed communities around Australia have become increasingly subtropical and many temperate species have retreated south towards the Australian south coast, according to new research — yet another sign that global warming is affecting nearly all the Earth’s ecoystems.

“Our findings add an important piece in the puzzle that is determining the global impacts of climate change,” said Thomas Wernberg of the University of Western Australia.

The study, reported online Oct. 27 in Current Biology, is based on herbarium records collected in Australia since the 1940s. The study helps to fill an important gap in understanding about the impact that global warming is having on the oceans, the researchers said.

The findings in Australia represent two of the major global oceans, the Indian and Pacific, Wernberg said. He added that it is also important to have documented these shifts in Australia because the Southern Hemisphere has been substantially underrepresented in climate change studies.

The changes observed in the seaweed community could have cascading effects across marine ecosystems, Wernberg said, as seaweeds are the “trees of the ocean,” providing food, shelter, and habitat to a diversity of other species.

“By extending the observed rates of poleward retreat to other species in the southern Australian seaweed flora, we estimated that projected ocean warming could lead to several hundred species retracting south and beyond the edge of the Australian continent, where they will have no suitable habitat and may therefore go extinct,” he said.

The magnitude of the shifts the researchers observed are consistent with patterns of observed warming in those areas.

The analyses draw on a very extensive marine database of more than 20,000 records of collected seaweeds. “Importantly, we did not select species based on preconceived ideas about which ones should have shifted or not—we looked at all 1,500 or so species in the southern seaweed flora and analyzed all of those species that had sufficient records.”

“I hope people will appreciate that the threats of climate change to marine environments are not just about exotic tropical coral reefs but also are likely to affect the diversity of life across a much broader spectrum of marine ecosystems,” Wernberg said.

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