9/20/2023 0 Comments Twilight zone ocean![]() “The rich variety of twilight zone life evolved in the last few million years, when ocean waters had cooled enough to act rather like a fridge, preserving the food for longer, and improving conditions allowing life to thrive,” said Dr. The study showed that in warmer seas of the past, this organic matter was degraded much faster by bacteria – meaning less food reached the twilight zone. “In these warm periods, far fewer organisms lived in the twilight zone, because much less food arrived from surface waters.”Īnimals in the twilight zone mainly feed on particles of organic matter that have sunk down from the ocean surface. “We found that the twilight zone was not always a rich habitat full of life. “We looked at two warm periods in the Earth’s past, about 50 million years ago and 15 million years ago,” said Professor Paul Pearson of Cardiff University, who led the research. The research team, made up of paleontologists and ocean modelers, looked at how abundant life was in the twilight zone in past warm climates, using records from preserved microscopic shells in ocean sediments. Katherine Crichton, from the University of Exeter, and lead author of the study. “We still know relatively little about the ocean twilight zone, but using evidence from the past we can understand what may happen in the future,” said Dr. The new study warns that climate change could cause a 20-40% reduction in twilight zone life by the end of the century.Īnd in a high-emissions future, life in the twilight zone could be severely depleted within 150 years, with no recovery for thousands of years. ![]() The twilight zone, which lies 200 to 1,000 meters (650 to 3,300 feet) deep, gets very little light but is home to a wide variety of organisms and billions of tonnes of organic matter. Life in the ocean’s “twilight zone” could decline dramatically due to climate change, new research suggests. The research highlights the urgent need to reduce greenhouse gas emissions to mitigate this impact. If high emissions persist, severe depletion could occur within 150 years, with no recovery for thousands of years. If greenhouse gas emissions aren’t reduced rapidly, much of the twilight zone’s biodiversity could disappear or go extinct within 150 years, with impacts lasting for millennia.Ī new study warns of a 20-40% reduction in biodiversity in the ocean’s twilight zone by the end of the century due to climate change. Based on Earth System Model simulations, the study suggested that significant changes may already be occurring. Researchers from the University of Exeter and Cardiff University examined the abundance of life in this region during past warm climates, discovering that less food reached the twilight zone due to faster degradation of organic matter by bacteria in warmer seas. If high emissions continue, the twilight zone could see severe depletion within 150 years with no recovery for thousands of years. ![]() Send us feedback about these examples.Climate change could cause a 20-40% reduction in life in the ocean’s twilight zone (200m to 1,000m deep) by the end of the century, according to a new study. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'twilight zone.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Eduardo Medina, New York Times, 13 Nov. Nasseri became trapped in a legal twilight zone. 2022 As the months turned into years, Mr. ![]() 2022 Some researchers suggest that there are at least a million undescribed species living in the ocean’s twilight zone. 2023 But in the ocean’s twilight zone, transparency has really taken off. 2020 Mounted high off the floor, the angled thigh cushion shores you up for relaxed control, and for comfort that carries you from an early start to well beyond the twilight zone. 2022 Traditional methods, which include trawling and baited cameras, can only offer snapshots of the complex deep-ocean world, says Elizabeth Allan, a postdoctoral investigator at the Woods Hole Oceanic Institute who works on the Institute’s ocean twilight zone project. 2023 Entering the twilight zone is no easy feat. Ed Park, The New York Review of Books, 14 Mar. 2021 As in David Lynch’s Blue Velvet (1986), a young man descends into a twilight zone behind an explicitly all-American façade. Nathaniel Scharping, Discover Magazine, 17 Mar. Recent Examples on the Web Some astronomers think extraterrestrial life could find a happy medium in the twilight zone of tidally locked worlds, near to where day turns to night. ![]()
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