Researchers Aim to Map Danger Areas for Dolphins

Research Highlights Marine Threat Hotspots Around Channel Islands

A new study by the University of Plymouth is shedding light on areas of risk for marine life around the Channel Islands, with a focus on threats to species such as dolphins.

PhD researchers Becky Dudley and Beth Harvey are leading the project, which aims to assess human impacts and identify danger zones for key marine populations.

As part of the research, Ms Harvey recorded a disturbance caused by a rigid inflatable boat (RIB) passing through a pod of bottlenose dolphins. Using hydrophones—underwater microphones—the team captured acoustic evidence of how such encounters can disrupt dolphin communication.

"The boat passed through the group without realising the potential impact," Ms Harvey explained. "There are clear guidelines in place for approaching bottlenose dolphins while boating."

She emphasised the need to keep a distance of at least 100 metres from the animals. "It’s essential that these dolphins are able to communicate with one another without interference," she said.

The University of Plymouth highlighted that the entire south coast of England, including the Gulf of Saint Malo, is designated as an Important Marine Mammal Area (IMMA), underscoring its significance for marine biodiversity.

Ms Dudley’s work focuses on how coastal dolphin populations, particularly bottlenose dolphins, can be better protected and managed. “They serve as indicators of ocean health,” she noted. “The issues impacting dolphins are often signs of broader environmental concerns affecting the entire marine ecosystem.”

Both researchers said the IMMA designation for the Channel Islands provides vital international recognition of the region’s ecological value. They hope this could lead to enhanced conservation measures.

“We want to show people what an extraordinary place the Channel Islands are for marine mammals,” said Ms Dudley. “Raising awareness is a crucial step in ensuring their protection.”