Surveying shows one of England’s important chalk streams has suffered “a decade of decline”, campaigners warn as they call for more action to protect the globally rare habitat.
Monitoring at five sites on the River Avon, which flows through Wiltshire and Hampshire, over the past 10 years by conservation charity WildFish has found a significant decline in wildlife such as freshwater shrimps, mayflies, caddisflies, beetles and aquatic bugs.
