We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The dual role of coastal mangroves: Sinks and sources of microplastics in rapidly urbanizing areas
AI summary Read the abstract
Researchers studied microplastic dynamics in mangrove ecosystems along two rivers and a coastal mangrove park in China's Pearl River Estuary. They found that mangroves play a dual role, acting as both sinks that trap microplastics and sources that release them back into the environment. The study highlights that rapid urbanization significantly increases microplastic loads in these sensitive coastal ecosystems.
Mangrove ecosystems are vital for coastal protection, biodiversity, and pollution interception, yet their interactions with microplastics in rapidly urbanizing regions remain underexplored. This study investigated the microplastic dynamics in the Maozhou River and Dasha River, along with the coastal Xiwan Mangrove Park in the Pearl River Estuary, the second largest estuary in China. Samples were collected from mangrove and surrounding areas, identifying microplastics using Fourier-transform infrared spectroscopy (FTIR) and Laser Direct Infrared (LDIR) techniques. Microplastic concentrations ranged from 245.8 to 1562.4 n/m³ in water and 374.3 to 7475.3 n/kg in sediments. The Maozhou River exhibited consistent microplastic levels across varying hydrological conditions, while the Dasha River and Xiwan Mangrove showed greater sensitivity to water flow changes influenced by urban land use. During high-flow periods, urban river microplastic concentrations decreased due to dilution, whereas mangrove areas experienced elevated levels in water from urban runoff, upstream retention, and sediment resuspension, suggesting a potential for outward release. Weaker water dynamics led to increased microplastic accumulation in mangrove sediments. The distribution of microplastic types was influenced by multiple urban pollution sources, with synthetic rubbers linked to urban transportation comprising over 50 % of some samples, peaking at 79 %. These findings underscore the dual role of mangroves as microplastic sinks and potential sources, highlighting the significant impact of hydrological conditions on their function. This study offers new insights into microplastic pollution in urban mangrove ecosystems and emphasizes the urgent need for improved management strategies in coastal areas facing rapid urbanization.
More Papers Like This
Characteristics and distribution of microplastics in the coastal mangrove sediments of China
AI summary Read the abstract
A survey of mangrove sediments along China's coast found microplastics were ubiquitous, with concentrations and polymer types varying by proximity to human activity and hydrological conditions. The study shows that mangrove forests, which provide critical coastal ecosystem services, are accumulating significant quantities of plastic pollution.
Microplastics in Singapore’s coastal mangrove ecosystems
AI summary Read the abstract
Researchers sampled coastal mangrove ecosystems in Singapore and found microplastics throughout, demonstrating that mangrove habitats accumulate plastic pollution and raising concerns for the organisms that depend on these ecologically important coastal forests.
The distribution, characteristics and ecological risks of microplastics in the mangroves of Southern China
AI summary Read the abstract
Microplastics were found to be widespread in mangrove sediments across Southern China, with higher concentrations in areas closer to urban development and aquaculture. The study highlights mangroves as accumulation zones for microplastic pollution, which could threaten these ecologically important coastal ecosystems.
Rivers as microplastics gatekeepers: Linking terrestrial inputs to coastal sediment sinks and sources
AI summary Read the abstract
Researchers measured microplastics in riverine and estuarine sediments across seasons in an urban Chinese coastal system, finding that riverine sediments held roughly 2.7 times more microplastics than estuarine sediments, and that a typhoon-driven discharge event flipped the estuary from a net sink to an active source by resuspending and exporting accumulated particles.
Breaking the coastal barrier: Typhoons convert estuarine mangroves into sources of microplastics to the ocean
AI summary Read the abstract
Researchers studied how typhoons affect the ability of mangrove forests in the Shenzhen River estuary to trap microplastics. During calm conditions, mangrove sediments stored high levels of microplastics, but typhoons flushed out roughly 90% of those particles, turning mangroves from microplastic sinks into sources. The findings suggest that extreme weather events can dramatically reshape how microplastics move through coastal ecosystems.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.