England’s largest seal colony sees 4500 pups born each year
One of England’s most spectacular winter wildlife events is underway with the births of the first grey seal pups at Blakeney National Nature Reserve on the North Norfolk coast, cared for by The National Trust.
Rangers at the conservation charity have high hopes for another successful pupping season for the colony, which has grown dramatically over the past 25 years to become the largest in England.
The latest estimates show around 4,500 pups being born every year. It is a far cry from the early 2000s when the colony was still becoming established.
In 2001, just 25 seal pup births were recorded. The charity now anticipates that there will be 180 times that number born between now and mid-January.
The success of the colony is believed to be due to the abundance of fish for the grey seals to feed on in the North Sea along with low levels of disturbance and mortality during the pups’ key first few weeks of life. They also benefit from a lack of natural predators.
National Trust rangers and volunteers continue to play a key part in supporting the seals by maintaining a regular presence on the four mile long shingle spit, which helps prevent disturbance and gives them the opportunity to share information with visitors.
The National Trust works throughout the year to ensure Blakeney Point offers a hospitable environment for the seals.
Local volunteers clean beach to protect pups
These efforts are supported by local volunteers whose contribution includes helping with a beach clean prior to pupping season. In September, they cleared up washed-up plastics, and other waste, from a two mile stretch of Blakeney Point.
Rangers are able to keep an extra close watch on how the grey seals are doing, thanks to the usage of a remote monitoring camera which’ll provide a continuous live video feed from the heart of the colony.
‘The grey seal colony is in the early stages of becoming established for this year and we are looking forward to following the progress of the colony, and its new pups, this winter,’ says Duncan Halpin, the National Trust’s Ranger for the North Norfolk coast.
‘Over the coming months, Blakeney Point will be carpeted in grey seals, as something in the region of 4,500 cow seals come ashore to have their pups.’
‘It’s a breathtaking sight and is testimony to the potential of our marine life to thrive when the right conditions, and protection from disturbance, are in place.’
As the numbers of grey seals at Blakeney Point have grown, the task of monitoring the size of the colony has become more complex. Efforts to count the seals on the ground have become increasingly impractical.
This is not only due to the sheer numbers of seals, but also because of the very real dangers of getting too close to these wild animals (experts say fully-grown bulls weigh around 230 kg).
Aerial photography provides estimated colony size
As such, the size of the colony will be estimated from aerial photographs, taken at different points during the pupping season, by marine biologists from the Sea Mammal Research Unit (SMRU) at the University of St Andrews.
This data is triangulated with observations on the ground, to arrive at a reliable estimate of the number of pups born.
‘The UK hosts almost half of the world’s grey seals,’ explains Dr Debbie Russell, Deputy Director of the Sea Mammal Research Unit.
‘Working with the National Trust, SMRU can estimate the number of pups born at Blakeney Point which feeds into our UK estimates.’
‘Critically, these numbers also feed into a project aiming to understand why grey seals are increasing so rapidly in Southeast England while harbour seals have declined by around 25% in the last five years.’
The National Trust suggests the best way to view the grey seal colony at Blakeney Point is by boat, with one of the seal boat tour operators that are based at Morston Quay. It’s recommended you book ahead this winter to ensure your place on the boats.
To prevent disturbance to the seals and their pups, visitors with dogs are no longer permitted to walk the full length of Blakeney Point during pupping season.
Blakeney Point is the only one of its significant sites in the area which saw seabirds escape from Avian flu relatively unscathed. It also had a good breeding year for Little terns.
