'Damaging the Antarctic damages us all'—scientists warn of the potential impacts of coastal freshening
Many of Antarctica's smallest inhabitants have evolved over millions of years so that their body fluids are similar in chemical composition to those of seawater. However, a combination of melting glaciers, increased rain and extreme weather events means that waters in some of the remotest parts of the planet are increasingly being exposed to reduced salt levels.
Scientists warn that coastal freshening in Antarctica could have severe impacts on the region's marine life and the global ocean. Many of the small organisms living in Antarctica have evolved to have body fluids similar to seawater, but melting glaciers, increased rainfall, and extreme weather events are causing waters to become increasingly diluted with fresh water. This phenomenon, known as freshening, can have significant consequences for marine invertebrates in shallow coastal waters.
In a new study, researchers from the University of Plymouth and the British Antarctic Survey investigated the effects of freshening on the giant amphipod species Paraceradocus miersi, which is abundant in Antarctic waters. They found that even a slight reduction in salt levels in the water can cause these amphipods to lose salts, gain water, and damage their gills.
The study's lead author, Professor John Spicer, has observed an extreme freshening event in 2017 at the Rothera Research Station on the Antarctic Peninsula, where the amphipods experienced salt loss, water gain, and gill damage.
The researchers warn that continued coastal freshening could lead to significant mortality among shallow-dwelling amphipods and other marine invertebrates, reshaping the community structure on the seafloor. Dr. Simon Morley, an ecophysiologist at the British Antarctic Survey, emphasizes that as climate change continues and the Antarctic ice melts, the oceans will become increasingly diluted with freshwater, leading to dramatic impacts on marine life.
The study highlights the importance of preserving the Antarctic ecosystem, as its health is crucial to the functioning of the global environment.
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