Articles tagged with Dead Zones
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A study found that a global pandemic is quietly wiping out sea urchins around the world, with populations nearing local extinction in the Canary Islands. The 2022-2023 mass mortality event affected the entire population of the species across the archipelago, causing a 74% decrease in La Palma and a 99.7% decrease in Tenerife.
The project aims to quantify the link between water conditions, fish populations, and wading bird nesting success in the Florida Everglades. Researchers will collect data on aquatic prey and habitat conditions during the dry season to provide essential insight into restoration efforts.
A new USF study suggests that nutrient upwelling and biological productivity remained stable despite higher global temperatures in the eastern tropical Pacific. The researchers found no evidence of reduced nitrate concentrations, a key nutrient for plankton, over the last five million years.
UCSB researchers warn that the ocean's cumulative impact will double by 2050 due to climate change and human activities. The tropics and poles are expected to experience the fastest changes in impacts, with coastal areas bearing the brunt of the increased pressures.
Researchers warn that artificial oxygen input cannot replace comprehensive water protection strategies. Technical approaches have shown promise, but risks include intensifying greenhouse gases and disrupting marine habitats. Climate protection and reducing nutrient inputs remain crucial for mitigating ocean oxygen loss.
Researchers at the University of Illinois have developed a new technique to eliminate fluid flow dead zones in electrodes used for battery-based seawater desalination. The tapered flow channel design improves fluid flow by two to three times, making it more efficient than current reverse osmosis methods.
Restoring field-margin wetlands in the US is insufficient to reduce nitrogen pollution in the Gulf of Mexico. Existing conservation programs have failed to meet targets for nutrient reduction, necessitating additional strategies to address the issue.
Researchers found that oxygen depletion in the Pacific Ocean off California's coast is linked to nutrient levels, not just temperature fluctuations. The study uses ancient molecules to warn of potential ecosystem disasters and fisheries impacts from increased nutrient input.
Research by University of Illinois Urbana-Champaign suggests that phosphorus legacy in riverbeds can delay water quality improvements in the Gulf of Mexico. It may take years or even decades for the reductions to be seen at the Gulf, according to a study published in Science of the Total Environment.
Local sea snails, such as the frilled dog winkle, are vulnerable to warming oceans due to their inability to adapt or migrate. In contrast, species like oysters and northern anchovies, which are tolerant of heat, may survive in warmer waters.
Researchers created a map of ancient ocean 'dead zones' to predict future locations and impacts of low oxygen zones in a warmer Earth's oceans. The map showed that during the Pliocene epoch, low-oxygen waters were widespread in the Atlantic Ocean, particularly in the North Atlantic.
Scientists at Michigan State University have discovered a way to use satellite views to understand and predict the formation of dead zones in coastal areas. The study found that satellites can provide near-real-time information on where, when, and how long hypoxic zones persist, enabling better management of these critical problems.
A study reveals a consistent pairing of volcanic ash and low ocean oxygen events during times of rapid climate warming at the end of the last ice age. The research suggests that volcanic eruptions may increase as the planet warms, posing risks to populated regions.
A team of scientists found that the largest open ocean dead zone in the eastern Pacific Ocean emerged eight million years ago due to increasing nutrient content. This natural phenomenon was caused by changes in weathering and erosion on land, leading to a major transition in terrestrial ecosystems.
Researchers found that low oxygen areas, or dead zones, were more likely to occur when red tides began in early summer. The study linked hypoxia to red tides across the west coast of Florida, shedding light on the conditions favorable for combined events.
Researchers used computer simulations and experiments to find that dead zones in indoor spaces can linger with infectious aerosols up to 10 times longer than the rest of the room. This discovery highlights the need for ventilation systems based on air circulation within a room, rather than relying solely on air changes per hour.
A new Stanford University study suggests that rising oxygen levels may have slowed down ancient ocean extinctions. The research found that oxygen levels beyond 40% of present atmospheric levels expanded viable ocean habitat and reduced extinction rates. This discovery has implications for understanding the fate of ocean creatures in to...
Researchers analyzed sediment cores from Bering Sea to find evidence of recurring low-oxygen events in North Pacific Ocean. High sea levels and changes in ocean circulation are thought to trigger these events, which could have severe consequences for ecosystems and food sources.
Researchers propose using cultivated seaweed to draw down available nutrients, limiting algae blooms and oxygen-poor dead zones. Seaweed aquaculture could also generate revenue through the production of biofuel, fertilizer, and food products.
Researchers found that pumping oxygen-rich surface water into the depths of lakes, estuaries, and coastal ocean waters could alleviate dangerous dead zones. The downwelling method was shown to be three to 100 times more efficient than other technological techniques.
A new study suggests that dark carbon fixation could be contributing to the growth of ocean 'dead zones', where oxygen is scarce. This means that existing models may underestimate the impact of climate change on these regions, leading to severe ecological and economic consequences.
The annual Chesapeake Bay Dead Zone Report Card shows hypoxia in 2019 was within the normal range despite record river flow and light winds. This suggests that nutrient reductions since the 1980s have successfully improved water quality, with the dead zone lasting longer than in recent years.
Researchers from Kanazawa University discovered that saturation of transcription or translation generates a dead zone in the circadian clock system, enabling it to remain insensitive to light signals during daytime. This finding highlights the fundamental properties of circadian clocks determined at the single-cell level.
A new study published in Environmental Research Letters finds that the volume of the Gulf of Mexico's dead zone is more responsive to nitrogen load reductions than its area. This suggests that measuring hypoxic volume could be a more effective way to assess the impacts of nutrient pollution on fisheries.
The Mississippi Bight region is expected to expand its low dissolved oxygen zones due to human impacts. Satellite data and field observations suggest the eastern delta region is similarly affected by river discharge.
A new study by Finnish and German researchers found that oxygen loss in the Baltic Sea's coastal areas is 'unprecedentedly severe' over the past century. Human-induced pollution from fertilizers, sewage, and agricultural runoff is the main driver of this issue.
Scientists found that late-season replenishment of oxygen allows the Bay to clean itself, leading to smaller and shorter-lived dead zones. This natural response suggests progress in reducing eutrophication and improving water quality.
The Gulf of Oman has been found to have a vast and growing oxygen minimum zone, with an area larger than Scotland having almost no oxygen left. Climate change and pollution are exacerbating the issue, threatening marine life and human reliance on the oceans.
Agricultural nitrogen runoff has created a massive oxygen-deprived 'dead zone' in the Gulf of Mexico, taking decades to recover even if eliminated. The area would need to reach 5,000 km² by 2050 to mitigate effects, an unrealistic goal given current unsustainable levels.
Researchers warn that achieving water quality goals for the Gulf of Mexico will take decades, as decades-long nitrogen buildup from agriculture poses a long-term problem. The study suggests major changes in agricultural and river management practices are necessary to improve water quality.
A new study predicts that shrinking the Gulf of Mexico dead zone will require a 59% reduction in nitrogen runoff, primarily through changes to agricultural practices. The study suggests that bold new approaches are needed to achieve this goal and meet the longstanding objective of reducing the dead zone by two-thirds.
A new study by Smithsonian scientists reveals that dead zones are a major threat to coral reefs globally, causing mass mortality. By controlling sewage and agricultural runoff, these localized threats can be reduced.
The Bay of Bengal has been identified as a new 'dead zone' with low oxygen levels, impacting its role in the global ocean's nutrient balance. Microbial communities can remove nitrogen, but the low oxygen concentrations limit their activity.
Researchers found that incorporating an unfertilized winter wheat cover crop into annual crop rotations can significantly reduce nitrogen and phosphorus lost from row crops, enhancing downstream water quality. The strategy may also help alleviate the Mississippi River's nutrient load contributing to the Gulf Dead Zone.
The NOAA-sponsored Gulf of Mexico hypoxia forecast predicts an average dead zone of 5,898 square miles, affecting nationally important commercial and recreational fisheries. The forecast uses multiple models to provide better information to communities and businesses, and aims to reduce the threat of hypoxic zones.
A new study found a link between abrupt ocean warming at the end of the last ice age and low-oxygen conditions that led to vast marine dead zones. Warming surface temperatures triggered loss of oxygen in the North Pacific, raising concern that similar events will occur again as oceans warm.
The Gulf of Mexico is forecasted to have a large 'dead zone' this year due to nutrient-rich runoff from farming states, with the predicted size ranging from 4,344 to 5,985 sq mi. The region's oxygen levels are expected to drop significantly, affecting commercial and sports fisheries.
Scientists discovered that Lake Erie's dead zones are variable and move erratically, affecting fish distributions and catch rates. Fish like yellow perch cluster at the edges of these areas, making it essential to determine effective fishing strategies.
A study by Smithsonian scientists found that oyster disease is more prevalent in areas with low oxygen levels at night, which can cripple the oysters' defense against the parasite. However, surprisingly, oysters' filtration powers flag during periods of low oxygen but recover afterwards.
A massive dead zone in Lake Erie was linked to the 2012 drought, according to a new study. Researchers found that agricultural practices and meteorological conditions explain year-to-year variability in the size of the dead zone.
The Gulf of Mexico dead zone measures 5,052 square miles this summer, slightly smaller than last year's record high. Nutrient runoff from agricultural activities continues to affect the nation's coastal resources and habitats in the Gulf.
A new study suggests that a natural limiting switch exists in ocean systems, preventing the development of unchecked hypoxic areas. This cutoff switch is triggered by the formation of iron sulfides when oxygen levels approach zero.
A large Gulf of Mexico oxygen-free 'dead' zone was found to be 5,840 square miles in size, larger than expected but smaller than predicted. This year's measurement highlights the continued effects of nutrient pollution from agricultural and human activities in the Mississippi River watershed.
The University of Michigan ecologist predicts a very large and potentially record-setting 2013 Gulf of Mexico 'dead zone,' expected to be between 7,286 and 8,561 square miles. This would be roughly equivalent to the size of Connecticut, Rhode Island, and the District of Columbia combined.
The NOAA is predicting a record-setting deadzone in the Gulf of Mexico, spanning between 7,286 and 8,561 square miles. This would be among the largest ever recorded, potentially affecting commercially important fisheries and the regional economy.
A new study reveals that land use in watersheds can impact Bay water quality, with urbanized landscapes contributing energy to fuel low-oxygen 'dead zones'. Organic carbon from these sources is more resistant to degradation, leading to increased persistence downstream.
The Gulf of Mexico's 'Dead Zone' grows larger due to increased fertilizer runoff from Midwestern fields, depleting oxygen levels and harming fish and shellfish populations. Advanced solutions like soil-staying fertilizers and genetically modified crops could mitigate the problem.
A recent study by Texas A&M researchers found the Gulf Dead Zone to be its smallest size in years, with no hypoxia detected off the Texas coast. The team's analysis covered over 1,200 miles of cruise track and revealed about 1,580 square miles of hypoxia compared to 3,400 square miles in 2011.
This year's predicted dead zone size features a wide range of 1,197 to 6,213 square miles due to differences between two forecast models. The actual size will be released after monitoring surveys led by Louisiana Universities Marine Consortium.
A recent study led by a US scientist estimates that human impacts on the ocean could cost the global economy over $1 trillion per year by 2100. The research highlights the urgent need to reduce pollution, overfishing, and other threats to ocean health.
Expanding ocean dead zones driven by climate change reduce oxygen levels, forcing blue marlins and other billfish to surface waters where they are more vulnerable to fishing. This shift affects the long-term health of these species and their ecosystems.
The size of dead zones in the Chesapeake Bay has decreased steadily since the late 1980s, linked to reduced nutrient pollution efforts, while early summer spikes are influenced by climate forces, not pollutants
A record-sized Gulf of Mexico 'dead zone' is expected, driven by massive amounts of nutrients from the Mississippi River. The predicted size could surpass 8,500 square miles, threatening major fisheries and ecosystems.
Scientists simulate oil and methane plumes, predicting locally significant but regionally confined dead zones in the northern Gulf. The study suggests oxygen levels will drop too low to support most life forms, affecting marine ecosystems.
The University of Michigan predicts a larger-than-average Gulf dead zone this year, with a range of 6,500 to 7,800 square miles. The impact of the Deepwater Horizon oil spill on the size of the dead zone is unclear, but it could either increase or decrease due to various factors.
The Gulf oil spill is threatening to worsen and expand the oxygen-depleted region known as the 'dead zone', a phenomenon caused by urban runoff and nitrogen-based fertilizers. Researchers are analyzing water samples to understand the impact of oil on oxygen levels, which could have devastating effects on marine life.
Scientists will investigate hypoxia's development and impact on Gulf fish populations, including shrimp and croaker. The research aims to refine management strategies for the dead zone, a critical threat to commercial and recreational fisheries.
A team of UBC researchers has mapped the genome of a microbe that thrives in dead zones, offering new insight into its metabolic capabilities and potential impact on climate change. The discovery provides an experimental framework for studying dead zone ecology and may help monitor and mitigate their expansion.
Researchers at Texas A&M University, led by Steve DiMarco, have been awarded a five-year, $3.72 million project to better understand and predict the formation of 'dead zones' in the Gulf of Mexico. The team aims to identify key factors contributing to these areas, which can cause fish kills and harm marine life.
The Gulf of Mexico's dead zone is smaller than expected this year, measuring 3,000 square miles, but severe in some areas. The area was predicted to be larger by NOAA models, driven by high nitrate loads and freshwater flows from rivers.