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Norderney, Niedersachsen - A rare natural phenomenon is currently drawing attention on the East Frisian Islands, where massive amounts of shellfish remains are piling up on the beaches. It appears that millions of mussels have succumbed to freezing temperatures, resulting in alarming scenes along the coastline.
Recent tides have washed ashore these creatures, predominantly American razor clams, which have been identified in the North Sea since 1979. These clams can grow up to 17 centimeters in length and are particularly sensitive to cold.
The mass die-off primarily affects the American razor clam species. According to the Lower Saxony State Office for Water Management, Coastal Defense, and Nature Conservation (NLWKN), this non-native species is less resilient to prolonged cold spells compared to native bivalves.
As a result, a blanket of dead mussels has accumulated on the northern beach of Norderney. Many of these marine animals were still alive when washed ashore, but the extreme cold rendered them too weak to re-burrow into the sand, leading to their demise.
In addition to the mussels, there are numerous dead sea stars and sea urchins scattered among the mussel remains. These marine species also appear to have perished due to the frigid conditions.
While this phenomenon is concerning, authorities indicate it is not unprecedented. Occurrences of mass shellfish die-offs have been recorded every few years, yet they do not typically raise alarm among scientists. The American razor clam, which was first documented along the North Sea coast in the late 20th century, is known for its high population density, with estimates of 440 to 1,500 individuals per square meter in regularly inundated areas of the Wadden Sea.
For local wildlife like seagulls and oystercatchers, the abundance of dead mussels presents a significant food source. As temperatures rise in the coming weeks, it is anticipated that the surviving clams will be able to burrow back into their preferred sandy habitats, allowing populations to recover.
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