Artificial islands offer refuge for endangered migratory birds in Germany

In the tranquil waters of Germany's Groß Schauener Seen, a vital conservation effort is underway to protect the endangered common tern. Ornithologists are meticulously ringing and weighing young birds, providing them with a unique aluminum ring that serves as their "personal identification card," according to Tim Funkenberg, a regional supervisor for the Heinz Sielmann Foundation.

These elegant seabirds, known for their striking black caps and white plumage, rely on gravelly, vegetation-poor areas for nesting. However, environmental changes, including river straightening, have significantly reduced the availability of natural sandbanks, their preferred nesting sites. This scarcity, coupled with threats from water tourism and predators like foxes and raccoons, has led to the species being placed on the Red List.

To combat this decline, the Heinz Sielmann Foundation, in collaboration with local partners, has deployed four artificial nesting islands. These platforms, primarily constructed from aluminum with smooth edges to deter predators, offer a safe haven for the terns to lay their eggs. The initiative, costing approximately 30,000 euros, is largely financed by private donations, highlighting a community-driven approach to conservation.

During a recent operation, 43 chicks were marked, with older birds weighing around 120 grams at two weeks old, while five-day-old chicks weighed just 40 to 50 grams. Last year, around 50 young birds were ringed. This ongoing project, now in its fourth summer of successful breeding, underscores the critical need for innovative solutions to preserve biodiversity in the face of habitat loss.