Global study links shipping and wastewater to changing bacteria in port waters
A global study of 23 ports reveals that shipping activity and wastewater discharge significantly alter bacterial communities in port waters. Researchers found that larger ports and high shipping traffic correlate with increased microbial diversity and the presence of potential pathogens.
Why it matters
The findings underscore the environmental impact of maritime trade and the need for stricter ballast water management and wastewater treatment to prevent the spread of pathogens.
A global study of port waters has found that shipping activity, port size and wastewater discharges play a significant role in shaping bacterial communities, highlighting the growing environmental pressures facing some of the world's busiest maritime gateways.
Researchers analysed more than 1,000 water samples collected from 23 ports in eight countries across five continents, examining over 16.5m DNA sequences to compare microbial diversity and identify the factors influencing port ecosystems.
The study found that bacterial communities generally became less similar as the distance between ports increased. However, this relationship was less pronounced at larger ports, suggesting intensive shipping activity may help transport microorganisms between distant regions through ballast water and biofouling on vessel hulls.
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