by Anne M Stark for LLNL News
Livermore CA (SPX) Aug 24, 2012
Many marine species will be harmed or won't survive if the levels of carbon dioxide continue to increase. Current protection policies and management practices are unlikely to be enough to save them. Unconventional, non-passive methods to conserve marine ecosystems need to be considered if various marine species are to survive.
This is the conclusion of a group of scientists led by University of California, Santa Cruz researcher and Lawrence Livermore National Laboratory visiting scientist Greg Rau, and includes Elizabeth McLeod of The Nature Conservancy in Hawaii and Ove Hoegh-Guldberg of the University of Queensland in Australia.
The increasing concentration of atmospheric CO" is thermally and chemically impacting the ocean and its ecosystems, namely warming and acidifying the oceans. By the middle of this century, the globe will likely warm by at least 2 degrees Celsius and the oceans will experience a more than 60 percent increase in acidity relative to pre-industrial levels.
"Our concern is that the specific actions to counter such impacts as identified in current policy statements will prove inadequate or ineffective," say the authors. "A much broader evaluation of marine management and mitigation options must now be seriously considered."
When carbon dioxide is released into the atmosphere, a significant fraction is passively taken up by the ocean in a form that makes the ocean more acidic. This acidification has been shown to be harmful to many species of marine life, especially corals and shellfish.
Earlier research has shown that ocean acidification can cause exoskeletal components to decay, retard growth and reproduction, reduce activity and threaten the survival of marine life including coral reefs.
Current marine policy recommends three calls to action to address ocean warming and acidification: stabilize or reduce atmospheric CO" levels; increase monitoring to better understand and predict the ocean's physical, chemical and biological responses to elevated CO"; and preserve ecosystem resilience and adaptability by reducing non-CO" related environmental threats.
While Rau and colleagues agree with the current policies, they conclude that these alone are unlikely to be enough.
"We are concerned that conventional marine environmental management methods may prove to be insufficient or not fully achievable in the time frame necessary to ensure the preservation of current marine ecosystems and their services in the face of CO"-related threats," Rau said.
The team suggests that policy makers solicit and evaluate all potential marine management strategies, including unconventional ones to determine which if any might satisfy the 1992 Convention of Biological Diversity's call for cost-effective prevention of environmental degradation.
The paper appears in the Aug. 19 edition of the journal, Nature Climate Change.
Lawrence Livermore National Laboratory
Water News - Science, Technology and Politics
Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.
Sea life 'facing major shock'
Brisbane, Australia (SPX) Aug 24, 2012
Life in the world's oceans faces far greater change and risk of large-scale extinctions than at any previous time in human history, a team of the world's leading marine scientists has warned. The researchers from Australia, the US, Canada, Germany, Panama, Norway and the UK have compared events which drove massive extinctions of sea life in the past with what is observed to be taking place in th ... read more
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2012 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|