Lingering Effects of VLSFO Spill on Mauritius Mangroves: Three Years On

Research confirms that remnants of the VLSFO spill from the MV Wakashio still exist in Mauritius’ mangroves three years after the incident. Dr. Alan Scarlett led a study showing a matching chemical fingerprint between the oil in sediments and that from the spill. While weathering has diminished toxicity, the lingering oil poses ecological risks, necessitating ongoing environmental monitoring and study of VLSFO behavior in marine settings.

Three years post the MV Wakashio’s grounding off Mauritius, research from Curtin University indicates that remnants of the Very Low Sulphur Fuel Oil (VLSFO) spill still contaminate local mangrove forests. This area is ecologically vital and near Ramsar conservation sites, emphasizing the need for continued monitoring and assessment of environmental effects.

Lead researcher Dr. Alan Scarlett confirmed that the chemical signature of the oil found in these mangroves closely matches the VLSFO released during the spill, marking the first recorded incident involving this type of fuel.

Dr. Scarlett stated, “Local communities in Mauritius have been aware of oil contamination in the mangrove wetlands since the Wakashio spill, but no official confirmation had been made regarding the source.” He emphasized the significance of acknowledging this contamination for both local communities and global understanding, given the limited knowledge on the behavior of VLSFO after a spill.

Analysis of sediment samples from the mangroves revealed oil from the Wakashio’s fuel tanks at one site, while a control site showed no oil impact. This indicates the spill’s localized environmental effect, raising concerns about the ongoing contamination’s implications for the delicate ecosystem.

Despite considerable weathering and biodegradation altering the spilled oil’s toxicity over three years, its lingering presence remains a threat to the mangrove ecosystem.

Prior work with the Woods Hole Oceanographic Institution produced a distinct chemical fingerprint of the spilled VLSFO, aiding confirmation of its presence in sediment samples.

Additionally, simulations using NOAA models suggested that the Wakashio’s VLSFO would more readily evaporate, disperse, or sink than traditional heavy fuel oils. However, evaluating its impact on marine organisms continues to be complex and challenging.

The study illustrates the prolonged environmental impact of the MV Wakashio oil spill, with VLSFO still detected in Mauritius’ mangrove ecosystems nearly three years later. The findings highlight the necessity of ongoing assessments to understand the spill’s ramifications fully and to inform local communities about potential risks to their environment. Advanced chemical analysis has confirmed both the presence and persistence of the oil, signaling a need for protective measures in vulnerable ecosystems.

Original Source: www.marinelink.com