内容摘要：Erin Williamson, vice-president of US customs brokerage at GEODIS, a global supply chain operator, said on Tuesday afternoon that the uncertainty had prompted some of her firm's clients to simply put shipments on pause.

Erin Williamson, vice-president of US customs brokerage at GEODIS, a global supply chain operator, said on Tuesday afternoon that the uncertainty had prompted some of her firm's clients to simply put shipments on pause.

"We see someone reporting a pod heading north from Seaton Sluice then about half an hour later, we detect it on our system," he said.Their system cannot yet track individual dolphins, but Prof Neasham said in the next few months the team hoped to introduce a dolphin whistle monitor to the sea.

Dolphins have "signature whistles", he said, and so it may be "possible to start tracking individuals by that".Teachers working at three schools have begun seven days of strike action in a long-running dispute over their potential closure.Education union the NASUWT said the plans for Glendale, Tweedmouth and Berwick middle schools in Northumberland would put 142 staff at risk, with only 50-60 jobs available after restructuring.

Union general secretary Dr Patrick Roach said Northumberland County Council was "behaving appallingly in refusing to do everything possible to save jobs and engage in a full consultation with those affected".The authority said its aim was to "secure permanent employment" for all staff over the next two years.

The council wants to close the middle schools as part of a move to a two-tier primary and secondary system.

The union has accused it ofTeachers at three middle schools have announced seven days of strike action in a long-running dispute over potential job losses.

There are plans to switch to a two-tier system in north Northumberland and shut three schools.The education union NASUWT said the planned closure of Glendale, Tweedmouth and Berwick middle schools would put 142 staff at risk with only 50 to 60 jobs to apply for after restructuring.

Northumberland County Council said it was trying to "secure permanent employment" for all staff over the next two years.NASUWT said the latest action would take place from 7 to 10 October and from 21 to 23 later in the month.