Marine life dramatically declined in Gulf of Mexico in years after BP oil spill, study finds
Marine Life Dramatically Declined in Gulf After BP Spill
Indiadailyupdate.com – Marine life dramatically declined in Gulf waters in the years following the 2010 Deepwater Horizon disaster, according to research examining the region’s poorly understood midwater “twilight zone.” The findings raise concerns about lasting disruption to a part of the ecosystem that supports fish, squid, crustaceans, whales and dolphins.
The Deepwater Horizon explosion killed 11 workers and triggered an oil and gas leak that continued for nearly five months. The BP-operated well released an estimated 134 million gallons of oil into the Gulf of Mexico.
Study records sharp losses in midwater species
Researchers surveyed waters from the surface to roughly 5,000 feet deep and compared observations made after the spill with data collected in 2015. Their study, published in PNAS, found broad declines among several important groups of animals.
Fish numbers fell 63.5%, while crustaceans including shrimp and krill declined 62%. Larger animals such as squid and octopuses decreased 59.7%. Krill fell 72%, and lanternfish populations dropped to about one-third of their earlier level. Dragonfish also showed substantial losses.
“These are foundational species,” Sutton said. “They're the things most things eat. So it's no wonder that we had wholesale changes across the community.”
Marine life dramatically declined in Gulf twilight-zone habitats that link the ocean’s upper and deeper waters. Many species move upward at night to feed and descend during the day, helping transfer energy through the Gulf’s food web.
Repeated surveys showed losses persisted
Scientists used net collections at different depths, acoustic sonar estimates and genetic analysis to assess changes in the marine community. The genetic work indicated reduced diversity among affected species, a potential concern because smaller populations can become more vulnerable to inbreeding.
An expedition in 2011 provided an early post-spill picture of the ecosystem. When researchers returned to the same area about three and a half years later using comparable methods, animal abundance had fallen to between one-quarter and one-third of the 2011 level.
“We saw this big decline,” Sutton said. “The question was then why? So we looked at all of the natural variables we thought could account for it, namely temperature, oxygen supply and food. None of those vary with the decline. The event that did was the oil spill.”
Sampling after 2015 found that depleted populations largely remained low. Researchers noted a modest increase in 2022 and 2023, but it was not statistically significant and did not demonstrate a sustained recovery.
Why the oil spill remains the leading explanation
The study does not prove a direct cause for every species decline. However, researchers found that changes in temperature, oxygen supply and food availability did not match the downturn. The timing of the losses made the spill the most likely explanation.
Oil exposure may have harmed animals during the disaster and could have affected surviving animals and their eggs. Marine life dramatically declined in Gulf ecosystems where even small animals play a central role as food for larger predators.
Gulf Coast FAQ
Why does the twilight zone matter to Gulf Coast communities? The midwater ecosystem supports marine food chains connected to commercially important fish and to wildlife such as dolphins and whales. Changes there can affect the wider Gulf ecosystem.
Has marine life recovered since the BP spill? The research found no statistically significant evidence of a lasting recovery through the reported surveys, despite a modest increase observed in 2022 and 2023.
What can Gulf residents take from this study? The findings underscore the importance of long-term marine monitoring after major spills, especially in deep and midwater habitats that are difficult to observe but essential to the Gulf’s food web.
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