Navigation Links
BP Deepwater Horizon oil spill exacerbated existing environmental problems in Louisiana marshes
Date:6/25/2012

GAINESVILLE, Fla. --- The BP Deepwater Horizon oil spill temporarily worsened existing manmade problems in Louisiana's salt marshes such as erosion, but there may be cause for optimism, according to a new study.

A study appearing online Monday in the Proceedings of the National Academy of Sciences found the 2010 spill killed off salt marsh plants 15 to 30 feet from the shoreline and this plant die off resulted in a more-than-doubled rate of erosion along the marsh edge and subsequent permanent marsh habitat loss. Vegetation farther from shore was relatively untouched by the incoming oil.

"Louisiana is already losing about a football field worth of wetlands every hour, and that was before the spill," said Brian Silliman, a University of Florida biologist and lead author of the study. "When grasses die from heavy oiling, their roots, that hold the marsh sediment together, also often die. By killing grasses on the marsh shoreline, the spill pushed erosion rates on the marsh edge to more than double what they were before. Because Louisiana was already experiencing significant erosive marsh loss due to the channelization of the Mississippi, this is a big example of how multiple human stressors can have additive effects."

Marshes are the life's blood of coastal Louisiana because they act as critical nurseries for the shrimp, oysters and fish produced in these waters while helping to sequester significant amounts of carbon. They also protect coastlines from flooding and guard estuarine waters from nutrient pollution.

But the marshes have been suffering for decades as a result of the channelization of the Mississippi River, which has starved them from needed sediments to deter erosion.

Then came the oil spill.

Researchers observed minimal oil on the surfaces of grasses located more than 45 feet from the shoreline, indicating that significant amounts of oil did not move into interior marshes.

Instead, the researchers found that the tall grasses along the marsh edge acted as wall-like trap to incoming oil slicks, concentrating oil on the marsh edge. This concentration of oil on the shoreline protected interior marshes from oiling but worsened already extreme erosion on the shoreline. As oiled plants died, their roots that hold tight to the sediment perished as well. Already eroding sediment was now exposed to wave action without the effect of the gripping plant roots.

The result: elevated erosion rates for 1.5 years that averaged more than 10 feet of shoreline loss per year -- double the natural rate for this area.

The encouraging results, Silliman said, included significant declines in the oil concentration on the marsh surface over 1.5 years and that unaffected, healthy marsh plants in the marsh interior quickly grew back into marsh die-off areas that had not yet been lost due to heightened erosion.

When the new marsh plant growth grew into the erosive edge of the marsh, Silliman said, the recolonization of the area by the gripping plant roots shut down the oil-elevated erosion rates and returned them to those seen at marsh sites where oil coverage did not occur.

The researchers also found that polyaromatic hydrocarbons, or PAHs, a carcinogenic byproduct of oil, was 100 percent greater at the Barateria Bay testing site than in reference marshes. This finding provides chemical evidence to support their visual observations that marshes in the affected areas were laden with oil while those in reference areas did not receive significant oiling.

By adding Biochar, a charcoal-based substance, to marshlands, Silliman's team is also using new bioremediation tactics to try to break down PAHs into organic material. If this method is successful, he said, it could be used to supplement naturally occurring microbes in the marsh mud that already oxidize the oil carcinogen. The team is soon to publish those findings.

"This is a new idea applied toward cleaning up PAHs," said UF chemistry professor Andrew R. Zimmerman, a co-author on the paper. "It's possible there's a bunch lurking at the bottom of the bay."


'/>"/>

Contact: Brian Silliman
brs@ufl.edu
University of Florida
Source:Eurekalert

Related biology news :

1. Study confirms oil from Deepwater Horizon disaster entered food chain in the Gulf of Mexico
2. Study by Haverford College professor reveals unprecedented impact of Deepwater Horizon on deep ocean
3. Microbial communities shifted dramatically after Deepwater Horizon spill
4. Waves of Berkeley Lab responders deploy omics to track Deepwater Horizon cleanup microbes
5. Westpak Deploys Horizontal Impact Test System (HITS)
6. Trouble on the horizon for GM crops?
7. Crabs, insects and spiders vulnerable to oil spill, but also resilient
8. University of Houston study shows BP oil spill hurt marshes, but recovery possible
9. Researchers call for a new direction in oil spill research
10. Marine scientists urge government to reassess oil spill response
11. NCEAS researchers offer new ecological model for deep-water oil spills
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/3/2016)... 2016 --> ... "Automated Fingerprint Identification System Market by Component (Hardware and ... & Finance, Government, Healthcare, and Transportation) and Geography - ... is expected to be worth USD 8.49 Billion by ... and 2020. The transformation and technology evolution from the ...
(Date:2/2/2016)... , Feb. 2, 2016 This BCC ... bioinformatic market by reviewing the recent advances in ... that drive the field forward. Includes forecast through ... Identify the challenges and opportunities that exist in ... software solution developers, as well as IT and ...
(Date:2/2/2016)... Feb. 2, 2016  Based on its recent ... Sullivan recognizes US-based Intelligent Retinal Imaging Systems (IRIS) ... Award for New Product Innovation. IRIS, a prominent ... North America , is poised to set ... diabetic retinopathy market. The IRIS technology presents superior ...
Breaking Biology News(10 mins):
(Date:2/3/2016)... Feb. 3, 2016 Ascendis Pharma A/S (Nasdaq: ... applies its innovative TransCon technology to address significant unmet ... upcoming investor conference.Event:2016 Leerink Partners Global Healthcare Conference Location: ... Wednesday, February 10, 2016 Time:  , 11:55am EST ... --> An audio webcast of this event ...
(Date:2/3/2016)... ... 03, 2016 , ... ProMIS Neurosciences is currently in the ... misfolded, propagating strains of Amyloid beta involved in Alzheimer’s disease. The Company plans ... Following on from the first misfolded Amyloid beta target announced on Nov. 12, ...
(Date:2/3/2016)... PALO ALTO, Calif. , Feb. 3, 2016 /PRNewswire/ ... the sale of AlphaImpactRx , a leading provider ... consumer health companies to IMS Health , a ... industry. AlphaImpactRx,s complementary offerings, capabilities and technologies will be ... the company,s growing global primary market research capabilities. ...
(Date:2/3/2016)... ... February 03, 2016 , ... Big games come and ... sacrificed so much for our country. CereScan, a nationally recognized brain diagnostics and technology ... Warrior Amputee Football Team (WWAFT) vs. NFL Stars Flag Football Game on February 6, ...
Breaking Biology Technology: