德国报告说外来物种河狸鼠威胁防洪与生态

Core Viewpoint - The invasive species nutria is increasingly threatening flood safety and ecosystems in Germany, as reported by the German Hunting Association [1][2] Group 1: Invasive Species Impact - In 2023, nutria was found in approximately 35% of surveyed hunting areas, doubling from 2015 [1] - In Bremen and Hamburg, up to 93% and 74% of hunting areas respectively reported the presence of nutria, indicating significant urban infiltration [1] - Nutria burrow tunnels several meters long along riverbanks and levees, posing risks to flood safety in coastal and inland river areas [1] Group 2: Ecological Consequences - Nutria particularly damage reed beds, which can lead to the complete loss of reed coverage along riverbanks, severely impacting biodiversity [1] - Reed beds are crucial breeding habitats for insects, amphibians, fish, and birds due to their slower water flow [1] Group 3: Historical Context and Call to Action - Nutria were introduced to Germany in the 19th century for meat and fur production, and have since established stable populations in the wild [2] - Factors such as feeding by humans, climate change, and hunting restrictions have contributed to their prevalence in urban areas [2] - The German Hunting Association urges government levels, city managers, and the public to collaborate in controlling the spread of nutria [2]