Ratty's messing about the the river again: Number of water voles on inland rivers increases

 

Hello again: The water vole is making a comeback

It's news to gladden Mole's heart – Ratty is making a comeback. There are now twice as many water voles being spotted on inland rivers compared with last year.

The small animals, which were the inspiration for the Ratty character in Kenneth Grahame's The Wind in the Willows, have been the UK's fastest declining mammal.

So the resurgence in sightings has been described as 'encouraging' by conservationists.

The semi-aquatic mammals, which have chubby faces and dark brown fur, were once a common sight in the UK.

Their population before 1960 was estimated at eight million, but the most recent estimate, in 2004, put numbers around 220,000.

The decline is partly attributed to increased numbers of American Mink, an aggressive predator, along with unsympathetic farming and watercourse management.

In April 2008, water voles were granted full status as an 'endangered species'. British Waterways conducts an annual survey of wildlife dependent on inland waters.

Most of this year's 89 sightings of water voles were on the Kennet and Avon Canal between Reading and Bristol.

The mammals live in burrows excavated in the banks of rivers, ditches, ponds and streams. 

In The Wind and The Willows, Ratty teaches Mole the ways of the river and the joy of 'simply messing about in boats'

Childhood favourite: In The Wind in the Willows, Ratty teaches Mole the ways of the river

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By Mark Kinver
Science and environment reporter, BBC News

Habitat loss caused the UK's water vole population to crash in recent years

A survey of the UK's waterways called 2009 a "bumper year" for water voles, which had been considered to be one of the nation's fastest declining mammals.

The study, organised by British Waterways, recorded 89 sightings of the rare rodent - twice as many as in 2008.

The number of water voles had crashed by 90% in recent years as a result of habitat loss and being preyed upon.

Of the 42,500 entries sent to the survey's website, mallards were the most frequently sighted species.

Water voles (Arvicola amphibius) are the UK's largest species of vole and are often mistaken for rats.

Adult males can measure in excess of 20cm (8ins), and weigh more than 300g (10.5oz). The rodents have an average lifespan of two years.

Although once a common sight along waterways, their numbers have plummeted in recent years.

Canals provide ideal conditions for a wide range of plant and animal species

Minks that escaped from fur farms were very efficient predators of water voles. Also, changes to farming practices and flood management schemes affected the rodents' habitats.

However, the resurgence in inland waterways has also been beneficial for wildlife.

Most of the sightings were recorded on the Kennet and Avon Canal, which runs between Reading and Bristol.

"The canals are like linear habitat corridors," Mark Robinson, British Waterways' national ecology manager, told BBC News.

"As well as water, we also have towpaths with grasslands and boundary hedges.

"These corridors are also excellent for species like bumblebees, butterflies, lots of flowering plants."

This year's survey is the sixth annual assessment conducted by British Waterways, but it has been the first year that people have been able to submit their findings online.

"This is the first year that we have made the survey completely internet-based," Dr Robinson explained.

"As a result, we have had a lot more entries than in the previous years.

"In the past, we would have between 6,000 and 7,000 individual records of species sent to us. This year, we have had in excess of 42,000 records.

"But with such a massive increase, we do have to bear in mind that we have received more sightings of species, including water voles.

"However, the benefit is that it tells us where we have got the voles. One of the key points to the survey is that we find out where we have got rare or endangered species."