Our directory of things of interest

University Directory

Playing laser tag with dolphins

  • Written by  Helen Taylor
  • Published in Wildlife
A bottlenose dolphin in the waters of Coll island in the Hebrides A bottlenose dolphin in the waters of Coll island in the Hebrides (Image: Martin Prochazkacz)
17 Apr
2018
Pioneering laser photography is being used by scientists on the west coast of Scotland to assess the health of the area’s marine life 

The Hebridean Whale and Dolphin Trust (HWDT), established in 1994, is carrying out research into the health of whales, dolphins and porpoises using photogrammetry – the science of taking measurements from photographs.

Silurian, the trust’s specialised research yacht (click here to track the vessel at sea), has been collecting data on cetaceans (the collective name for whales, dolphins and porpoises) since 2002. It was even used during the filming of the BBC’s Blue Planet series. Its photo-identification research has so far catalogued 230 minke whales, some of which have been returning to the same area for more than ten years.

Photographing a minke whale from the Silurian (Image: HWDT)Photographing a minke whale from the Silurian (Image: HWDT)

Over the last 15 years, Silurian has travelled more than 100,000 kilometres while surveying Hebridean waters from Islay to Cape Wrath and west of the Western Isles. Data collected onboard forms the largest continuous database of its kind in the UK, comprising over 6,000 hours of underwater sound recordings, and over 30,000 animal records. The current series of expeditions into the waters of Scotland take place until October this year.

The new technology works by pointing two lasers attached to the main identification camera 10cm apart onto the side of an animal at the same time a photograph is taken. ‘From those two dots on the image we can work out all sorts of things,’ says Lauren Hartny-Mills, science officer at the HWDT, ‘the health of the animals, how well they’re doing, how big they are, and whether they’re fully grown adults or younger animals. It will also help us look more closely at marks and scars and determine how those have been caused, whether by interaction with debris in the environment or natural markings from other animals.’

Minke whale in the Hebrides (Image: HWDT)A minke whale in the Hebrides (Image: HWDT)

Fiona Manson, a marine specialist at Scottish Natural Heritage, said: ‘The Hebridean Whale and Dolphin Trust is making an important contribution to marine conservation in Scotland. We’re excited by the innovative techniques being used to find out more about the health of wildlife in Scotland’s seas.’

The Silurian research yacht (Image: HWDT)The Silurian research yacht (Image: HWDT)

Because cetaceans are such long-lived animals that reproduce slowly, scientists at the Trust say it’s important to monitor population dynamics and composition, as any changes in health or behaviour may take a long time to show. Other issues facing cetaceans, as well as interactions with man-made objects such as marine plastic and fishing gear, are underwater noise (which interferes with their echolocation) and the accumulation of pollutants in their systems.

For example, in 2016, a member of the West Coast of Scotland killer whale pod was found to have one of the highest levels of polychlorinated biphenyl (PCB) pollution ever recorded in the species after she was washed-up on the Isle of Tiree in the Hebrides.

geo line break v3

Free eBooks - Geographical Newsletter

Get the best of Geographical delivered straight to your inbox by signing up to our weekly newsletter and get a free collection of eBooks!

geo line break v3

Related items

NEVER MISS A STORY - Follow Geographical on Social

Want to stay up to date with breaking Geographical stories? Join the thousands following us on Twitter, Facebook and Instagram and stay informed about the world.

More articles in NATURE...

Energy

Though the pandemic has gripped the world's attention, lying just…

Climate

The IPCC embraced the notion of carbon offset schemes in…

Geophoto

The shortlist for the 2020 Wellcome Photography Prize has been…

Climate

Millions have been displaced due to severe floods in central…

Wildlife

A portable DNA assay could revolutionise the way border officials…

Climate

A handy gathering of facts about carbon emissions with graphs…

Oceans

Researchers have revealed just how many polluting microfibres are released…

Wildlife

Increasing reports of seized jaguar fangs and skin suggest that…

Geophoto

Forced isolation has given many of us the chance to…

Oceans

A fifth of the ocean floor has now been mapped,…

Wildlife

Four ex-circus lions discovered in France are due to be…

Oceans

A roundup of some of the top discussions from the…

Energy

The agave plant, used to make Tequila, has proven itself…

Climate

Concerns about the ozone hole have diminished as levels of…

Wildlife

In the Eastern Cape of South Africa, Munu – a…

Geophoto

Photography competition, Earth Photo, returns for the third year with…

Oceans

A new study reveals the process behind the strange phenomenon…