Estuaries

When the Schuylkill swallowed the city: Lessons from Hurricane Ida’s historic flood

Environmental DNA in NYC’s East River reveals clues about nearby human and animal residents

Researchers used eDNA to monitor human diets and track local wildlife in NYC's East River, revealing the presence of domesticated animals and seasonal fish populations. The study found correlations between wastewater eDNA levels and human dietary patterns, providing a valuable tool for urban estuary management.

Waikīkī faces escalating threat of sewage-contaminated flooding as sea level rises

A new study reveals that Waikiki is facing a fundamental shift in flood hazards as sea levels rise, transitioning from rainfall-driven floods to tidal process-dominated events. The team identified two key pathways, storm drain backflow and groundwater emergence, which will increase public exposure to sewage-contaminated waters.

Which species are most at risk from complex global change?

A new framework links body size, lifespan, and mobility to species' responses to multiple environmental pressures. The study suggests that smaller and less mobile species are more vulnerable to warming, while short-lived species exhibit variable responses over time.

New study assesses potential dust control options for Great Salt Lake

A new collaborative study evaluates potential dust control measures for the Great Salt Lake, considering effectiveness, cost, water demand, maintenance needs, and ecological impacts. The analysis emphasizes the importance of long-term planning, sustained maintenance, and careful consideration of unintended consequences.

Shrinking shellfish? FAU study uncovers acidic water risks in Indian River lagoon

A new FAU study uncovers the impact of acidic water on shell-building marine organisms, highlighting the need for strategies to mitigate coastal acidification. The research found that nutrient pollution, freshwater input, and other environmental factors contribute to reduced aragonite saturation.

Flood risks in delta cities are increasing, study finds

Research shows that flooding in delta cities like Shanghai can expand by up to 80% and be much deeper by 2100 due to extreme climate events, sea-level rise and land subsidence. A major adaptation effort is required to raise defences and construct mobile flood barriers.

Sand mining threatens the future of critical SE Asian ecosystem

The study found that sand mining in the Mekong River is causing a decline in the reverse flow system that feeds water into Tonlé Sap Lake. The lake is home to 885 species and provides livelihoods for almost two million fishers, but its future is at risk due to the increased extraction rates.

FAU’s CAROSEL offers new ‘spin’ on monitoring water quality in real time

Researchers track benthic nutrient fluxes using a new device called CAROSEL, which measures nitrogen released from sediments in real-time. The findings reveal daily rhythms in oxygen fluxes and highlight the importance of understanding sediment-water interactions in managing aquatic ecosystems.

Global review identifies opportunities to improve monitoring of juvenile fish habitats

A global review highlights the need for better tools to understand juvenile fish habitats, which are facing increased pressure from various factors. The study recommends incorporating metrics like growth, survival, and contribution rates to assess habitat quality.

New Chesapeake Bay Watershed stream maps double documented stream miles

A new dataset doubles documented stream miles in the Chesapeake Bay Watershed, allowing for more accurate characterization of water flow and land use. The high-resolution data will help prioritize restoration projects, such as streamside tree plantings and pollutant filtering.

Juvenile salmon roam between salt and fresh water while exploring coast and rivers, new research finds

Juvenile salmon were found to roam miles of coastline, moving between freshwater and saltwater and exploring rivers as they go. This behavior improves their resilience by locating new habitats and reduces competition, increasing their chances of survival.

UH researcher unveils new model to evaluate impact of extreme events and natural hazards

A new numerical computer model tracks how pollution travels through Galveston Bay, helping scientists understand water movement in estuaries. The model is critical for evaluating climate variability and sea level fluctuation impacts on coastal communities, guiding better decisions to keep water clean and prevent flooding.

Tree rings from Gaspésie mountains reveal effects of global warming dating back almost a century

Researchers found significant implications for water management and wildlife due to the decline in snowpack, affecting the Sainte-Anne River and its streamflow patterns. The study's findings align with historical records of droughts and heavy precipitation, highlighting the importance of protecting old growth forests.

Salt influx from land and sea spells ‘double trouble’ for drinking water

A new study led by University of Maryland geologist Sujay Kaushal finds that multiple threats are making fresh water saltier, including land-based pollution and saltwater intrusion. The researchers offer a framework for predicting and preventing the issue, which affects ecosystems, agriculture, and drinking water supplies.

Study warns of deadly future marine heat waves in East Coast estuaries

A study predicts East Coast estuaries will face devastating consequences from increased marine heat waves, with potential ecosystem collapse and job losses. The researchers found strong connections between estuaries in similar geographic regions, driven by atmospheric heat exchange.

GHG concentration and emissions vary seasonally and alongside human behaviors in estuaries

A two-year study found that anthropogenic activities significantly impact methane and nitrous oxide levels in the Pearl River Estuary. Seasonal variations also play a role, with reduced concentrations observed during COVID-19 lockdowns.

Invasive pike use marine corridors to colonize new Alaska territory

A new study reveals that northern pike are colonizing freshwater habitats in Southcentral Alaska through marine corridors, challenging existing conservation efforts. Researchers analyzed otoliths from caught fish and found isotopic signatures matching upper Cook Inlet water, suggesting the fish had occupied the inlet at some point.

AMS 2025 meeting promotes atmospheric science for a “thriving planet”

The 105th Annual Meeting of the American Meteorological Society will address key issues in weather, water, and climate. The meeting features a Presidential Forum on physical, social, cultural, and economic impacts of climate change, with experts from the region of the Mississippi River Delta.

Heavy rains deliver largest amounts of fertilizer-derived nitrogen pollution to the Gulf of Mexico, new study finds

A new study finds that heavy rains deliver the greatest amounts of fertilizer-derived nitrogen through creeks and rivers into the northern Gulf of Mexico. The research can be used to develop policies to protect the gulf from nutrient overloading, harmful algal blooms, and oxygen-depleted 'dead zones'.

‘Drowning continent’: Study confirms Western Australian coastline’s complex history

Researchers confirm Rottnest Island and Swan River geological histories through ancient mineral grains. The study offers insights into the coast's transformation over thousands of years and its future adaptations to rising sea levels.

Dams built to prevent coastal flooding can worsen it

Researchers found that coastal dams can either increase or decrease flood risks, depending on the duration of a surge event and friction from water flow. The study, published in the Journal of Geophysical Research: Oceans, analyzed data from Charleston Harbor and other estuaries to make this surprising discovery.

What’s really ‘fueling’ harmful algae in Florida’s lake Okeechobee?

Research by FAU Harbor Branch reveals that managing both phosphorus and nitrogen is crucial for tackling toxic cyanobacterial blooms in Lake Okeechobee. Human waste is identified as a major source of nutrients, with elevated nitrogen levels found in urbanized estuaries and the Kissimmee River.

South Florida estuaries warming faster than Gulf of Mexico, global ocean, USF research shows

Researchers at University of South Florida found that sea surface temperatures in four estuaries in South Florida have risen faster than globally and in the Gulf of Mexico. The accelerated warming poses a threat to marine life, including algae, seagrass, and coral reefs.

Waters along Bar Harbor, Acadia home to billions of microplastics

Researchers discovered an estimated 400 billion microplastic fibers in Frenchman Bay and its tributaries, with concentrations highest in the bay itself. The study found that microplastics were transported from land through rivers and estuaries into the bay, posing a significant threat to marine life and humans.

Could fishponds help with Hawaiʻi’s food sustainability?

A study by University of Hawaii researchers suggests that revitalizing Indigenous aquaculture systems, known as loko iʻa fishponds, can increase locally available seafood production. This revival has the potential to boost local food production and provide a sustainable solution to Hawaiʻi's seafood supply.

Humans converted at least 250,000 acres of estuaries to cities, farms in last 35 years

Over the past 35 years, dams and land reclamation activities converted 250,000 acres of estuary — an area roughly 17 times the size of Manhattan — to urban land or agricultural fields. Most land conversion and estuary loss in rapidly developing countries.

Ecology: Increasing sea temperatures associated with higher bull shark abundance

Increasing sea surface temperatures have led to a five-fold increase in juvenile bull sharks in Mobile Bay. The study found that warmer waters made habitats more suitable for these sharks. Computer modeling revealed that temperatures above 22.5°C were associated with higher shark presence.

UT Arlington grad student earns fellowship from atomic energy agency

Suprina Shrestha, a UT Arlington graduate student, has been awarded the Marie Sklodowska-Curie Fellowship from the International Atomic Energy Agency. The fellowship aims to support women in studying nuclear-related subjects and will provide financial assistance for her research in isotope hydrology.

Sea otters’ homecoming to a California estuary proves there is payoff in conservation

The reintroduction of sea otters to their former habitat in Central California's Elkhorn Slough has slowed erosion of creekbanks and marsh edges by up to 90%. The study, published in Nature, highlights the benefits of conservation efforts and suggests a promising tool for stabilizing ecosystems worldwide.

How tidal range electricity generation can protect coastal areas from flooding

Researchers at Lancaster University found that tidal range schemes can protect estuaries and coastal areas from sea level rise by harnessing high tides and maintaining low tide levels. These barrages can provide jobs, reliable power, and reduced costs while conserving habitats.

Researchers awarded $1M to protect coastal communities, aquaculture industry

The BioSPACE project aims to provide farmers, environmental agencies, and water-reliant industries with portable sensors to rapidly detect germs that threaten marine and freshwater life. The economic burden caused by waterborne diseases exceeds $3 billion in direct health care costs each year in the United States.

All aquatic species in river mouths are contaminated by microplastics

A study by Universitat Autonoma de Barcelona found that all aquatic species in river mouths are contaminated with microplastics. Molluscs were the most affected, and nanoplastics posed a greater risk to aquatic organisms due to their ability to pass through cellular membranes.

Clearing mangroves makes ‘muddification’ worse

A new study found that removing mangroves in New Zealand's estuaries actually increases mud build-up, as these coastal trees and shrubs trap sediment efficiently. This highlights the need for sustainable land use upstream to address the root cause of the issue, rather than focusing solely on mangrove removal.

Climate is increasing risk of high toxin concentrations in Northern US lakes

Researchers have found that water temperatures between 20-25 degrees Celsius are at the greatest risk for developing dangerous levels of microcystin, a common algae-produced toxin. Climate change is expected to increase blue-green algae populations, posing serious health hazards and economic risks.

Underwater cameras facilitate large-scale study of oyster reef habitat in Chesapeake Bay

A new study used underwater cameras to assess oyster reef habitats across 12 tributaries in the Chesapeake Bay, finding that unharvested reefs and restored reefs had more complex structures. The results showed an upward trend in habitat scores over time, with unharvested and restored reefs maintaining higher habitat scores consistently.

Rebates can offer solutions to California’s groundwater woes

A new study suggests that rebates can offer solutions to California's groundwater woes by incentivizing the collection of stormwater runoff and its infiltration into aquifers. The recharge net metering (ReNeM) program, modeled after rooftop solar metering, helps agencies meet Sustainable Groundwater Management Act requirements.

New research findings: Understanding the sex life of coral gives hope of clawing it back from the path to extinction

Scientists have mapped the reproductive strategies and life cycle of an endangered coral species, offering a glimmer of hope for its recovery. The purple cauliflower soft coral's findings can inform conservation strategies and potential restoration efforts, including the creation of new coral colonies to repopulate areas of habitat.

Nitrogen runoff strategies complicated by climate change

New research suggests that rising temperatures may offset the impact of increased precipitation on nitrogen runoff, which could lead to reduced aquatic pollution. The study found that warmer temperatures reduce evaporation, allowing more nitrogen to enter waterways, while also affecting microbial life in soil and sediment.

Rio Pará contributes high trace metal concentrations to the Amazon estuary

New research reveals that the Amazon estuary receives significant dissolved neodymium and hafnium from the Rio Pará River, contrary to previous assumptions about suspended solid sources. The findings indicate a revised estimate of global riverine neodymium flux, with concentrations up to three times higher than previously thought.

What controls the pathways of the Labrador Current?

Researchers from McGill University found that stronger winds shift the Labrador Current eastward, leading to sudden warmings or drops in oxygen levels. This has dire consequences for marine ecosystems and fisheries, including smaller species like cod and halibut, which struggle to survive in low-oxygen conditions.

Significant citizen participation: Study examines the fate of plastic particles

A multidisciplinary team of scientists conducted a comprehensive study to understand the sources and sinks of plastic debris in the Southern North Sea. Local citizen scientists played a crucial role in tracking the distribution pathways of plastic particles, revealing that two-thirds were washed ashore within 25km of their release site.

Marine seagrass meadows show resilience to ‘bounce back’ after die-offs

Study in Florida Bay reveals that turtlegrass can successfully recruit into open bare sediment following die-off events due to biomass partitioning and efficient oxidation. However, recovery of seagrass meadows takes time, with full recovery taking at least a decade.

CityU establishes the first UNESCO Regional Training and Research Centre on coastal contaminant monitoring in Hong Kong for the Western Pacific region

The City University of Hong Kong (CityU) has been approved to establish the first UNESCO Regional Training and Research Centre on coastal contaminant monitoring in Hong Kong, focusing on the Western Pacific region. The centre aims to strengthen marine pollution monitoring, promote innovative technologies, and facilitate international r...

Fish and bottlenose dolphins react differently to life in noisy shipping corridor of Charleston Harbor Estuary, with fish calls and choruses decreasing with anthropogenic noise, and dolphins ramping up vocalizations

Researchers found fish and bottlenose dolphins react differently to life in noisy shipping corridor of Charleston Harbor Estuary. Fish calls and choruses decreased with increasing anthropogenic noise, while dolphins ramped up their vocalizations. This study highlights the impact of human activities on marine wildlife.

Environmental impact reports hugely underestimate consequences for wildlife

A study from the University of East Anglia found that environmental impact assessments often fail to account for species movement between sites, leading to underestimated impacts on wildlife. The research highlights a planned airport development in Portugal that could affect over 10 times the number of Black-tailed Godwits estimated by...

Estuaries face higher nutrient loads in the future – particularly on the Atlantic coast

Estuaries along the Atlantic coast and eastern Gulf of Mexico are expected to experience significant increases in nutrient loading, posing risks for harmful algal blooms and ecosystem health. The study identified regions with high adaptive capacity as having more resources to mitigate these effects.

Novel method of analyzing microplastic particle pollution can facilitate environmental impact assessment

Researchers propose a novel approach to analyzing microplastic particles, highlighting the importance of particle size and shape in determining environmental impact. Studies show that even samples with similar numbers of particles can have varying levels of plastic pollution based on mass, volume, and specific surface area.

Excess nutrients lead to dramatic ecosystem changes in Cape Cod’s Waquoit Bay; the bay is a harbinger for estuaries worldwide, say researchers

Researchers found that Waquoit Bay has shifted from a benthic to a pelagically-dominated ecosystem due to human causes, including excess nutrient pollution and climate change. The bay's ecosystem degradation has broader implications for estuaries worldwide.

New insights on why improvements to Chesapeake Bay remain a challenge

A new study on Chesapeake Bay water quality found that pollution thresholds affect reduction efforts, and larger reductions may be needed to induce complete reversal of eutrophication-induced hypoxia. The research revealed that the system responds only until a certain threshold is crossed, then it takes twice the effort to make a change.

The key to weathering rapid sea-level rise may lie in a Massachusetts salt marsh

A team of researchers found that coastal habitats can adapt to rapid sea-level rise by utilizing abundant sediment, which can help salt marshes survive. The study's key finding highlights the importance of re-infusing sediment into estuary systems when dredging is necessary.

Researchers propose a more effective method to predict floods

A team of researchers from Xi'an Jiaotong-Liverpool University and other institutions has identified a flexible and user-friendly model for predicting flood frequency in a changing environment. The fractional polynomial-based regression method is more effective than existing models, which often fail to account for factors like climate ...

Scientists find first evidence that marine conservation mitigates climate change

Marine protected areas significantly increase carbon sequestration in seagrass and mangrove ecosystems. Biodiversity and species richness also rise in preserved waters, contributing to food security and human well-being. Full protection is necessary for maximum benefits.

Study shows potential of Southern cattail for phytoremediation of areas contaminated by mine tailings

Researchers found that the Southern cattail plant can scavenge up to 34 times more manganese from contaminated soil than other plants. The study suggests its potential for sustainable rehabilitation of areas affected by iron mine tailings, demonstrating its high efficiency in phytoremediation.

Humpback whales that visit New York, New Jersey stay longer and visit again

Researchers found that 58.4% of humpback whales in the New York Bight Apex stayed more than one day and returned within or between years. The average length of stay was 37.6 days.

The world’s rivers are changing, here’s how

The construction of dams and changes in land use have significantly impacted the amount of sediment rivers carry to oceans. Sediment transport has decreased by 49% globally due to dam construction, while increasing on 36% of rivers in the south, primarily driven by deforestation.

The New York – New Jersey Harbor Estuary is a dining hotspot during summer and autumn months for bottlenose dolphins

A WCS study tracked bottlenose dolphins' feeding behavior in the NYC-New Jersey Harbor Estuary, revealing seasonal patterns and relationships to environmental factors. The research aims to inform mitigation measures reducing human-wildlife conflict and conserving marine mammals.

New research on tidal flats is ‘wake up call’ for US coastal communities

A new study reveals that tidal flats in the southeastern US are under pressure from urbanization, leading to erosion and loss of these critical ecosystem guardians. The research highlights the need for sustainable management plans to mitigate the impacts of urban expansion on coastal environments.

Invasive species and climate change impact coastal estuaries

A recent study published in Ecology found that climate change and biological invasions are altering the predator-prey landscape in California's coastal estuaries. This interaction increases stress on native species, making them more vulnerable to invasive predators.

UNH researchers find watershed size plays major role in filtering pollutants

The study found that superlinear scaling occurs in aquatic ecosystems of larger watersheds, releasing carbon back into the atmosphere. Smaller watersheds are less effective at filtering pollutants and mitigating nonpoint source pollution.