HWDT’s cetacean surveys show imperative to conserve healthy west coast waters

Basking shark alongside Silurian © HWDT

Research surveys conducted by the Hebridean Whale and Dolphin Trust [HWDT] during 2013 have identified a remarkably wide range of whale, dolphin and porpoise species – highlighting the need to conserve the rich biodiversity and globally-important marine habitats in the seas of western Scotland.

The latest research is part of HWDT’s unique and long-term monitoring project of cetaceans – whales, dolphins and porpoises – in the Hebrides.

With growing concerns over the state of the UK’s seas, and threats to wildlife and ecosystems from human activity, HWDT is calling for volunteers to help continue the pioneering research in 2014.

In total during 2013, HWDT recorded more than 400 encounters with cetaceans and basking sharks and made almost 1,000 underwater detections of cetaceans using specialist listening equipment.

Kerry Froud, HWDT Biodiversity Officer, says: ‘The impressive range of species of cetaceans and basking sharks that we have documented this year highlights the wealth of marine life in Scotland’s west coast ocean environment – and the importance of ensuring the continued survival of these spectacular animals and maintaining the healthy seas that support them.’

3,000 nautical miles and the ‘West Coast Community’ on the edge of extinction

With the help of 48 volunteers working alongside marine scientists, the charity carried out nine surveys on its research yacht Silurian during 2013. The surveys covered more than 3,000 nautical miles and spanned nearly all of the Hebrides and beyond – from Ballycastle, Northern Ireland in the south, west to the Outer Hebrides, and to Cape Wrath in the north.

A major encounter – in August near the Isle of Skye – was a rare sighting of three members of a group of killer whales known as the ‘West Coast Community’. This very small group consisting of just five males and four females is thought to be the UK’s only known resident group, but, as no calves have been seen within the group, it is likely to become extinct in our lifetime.

Other highlights of the 2013 surveys included:

  • 417 encounters with cetaceans and basking sharks – consisting of 321 encounters of harbour porpoise; 34 of minke whale; 32 of basking shark; 22 of common dolphin; six of white-beaked dolphin; one of killer whale; and one of Risso’s dolphin.
  • Recorded acoustic detections of 821 harbour porpoise; 129 common dolphin; six white-beaked dolphin; and one Risso’s dolphin – the latter adding to sparse acoustic data currently available for this species.
  • Visual sightings of 316 harbour porpoises, with the species being detected acoustically 821 times. Scotland’s west coast is one of Europe’s most important habitats for harbour porpoises.
  • 50 basking sharks recorded in nine days alone in June. Sightings of basking sharks have been increasing in recent years.

Although little was known about Hebridean cetaceans until relatively recently, HWDT’s work is strengthening knowledge about their distribution, movements, habitats and behaviour.

The charity’s findings now form the most comprehensive data available, supporting effective conservation – including by providing researchers and policy-makers with crucial data on cetacean distribution patterns – and benefitting HWDT’s education work.

The case for Marine Protected Areas

HWDT’s findings will contribute to the Scottish Government’s historic initiative to identify areas for possible Marine Protected Areas featuring cetaceans and basking sharks.

This year, a network of 33 marine reserves has been proposed. A decision on which will go forward for designation as Marine Protected Areas is expected in Spring 2014 – potentially providing protection to Scotland’s marine environment by preventing damaging activities within the reserves.

HWDT’s data will also contribute to the Joint Cetacean Protocol, a UK-wide initiative that is combining data from different sources to add to knowledge of cetacean distribution and trends.

Western Scotland’s seas are one of Europe’s most important habitats for cetaceans. The long, complex coastline, strong ocean currents and wide variety of habitats help make the Hebrides one of the most biologically productive areas in the UK. So far 24 cetacean species have been recorded in the region, many of which are national and international conservation priority species.

Marine ecosystems are fragile, and cetaceans face increasing stress from human activities including climate change, entanglement in fishing gear, pollution, underwater noise and habitat degradation.

HWDT improves knowledge and understanding of Scotland’s whales, dolphins and porpoises and the Hebridean marine environment through education, research and working within local communities to ensure lasting conservation of species and habitats.

HWDT recruiting volunteers now for 2014 surveys

The charity is recruiting volunteers to take part in its 2014 surveys. Volunteers will live and work onboard Silurian for almost two weeks, working alongside marine scientists, collecting data during visual surveys, and conducting acoustic monitoring including with hydrophones. They will receive full training and assist with the day-to-day running of the research vessel.

Places on the surveys – which depart from Tobermory on the Isle of Mull or Kyle of Lochalsh – are available from May to September.

Participation costs range from £800 – £1,300, which covers boat expenses, supports HWDT’s research programme and includes accommodation, food and insurance onboard Silurian.

For details

About HWDT

One of Argyll’s serious assets in establishing and protecting what is the richest area of biodiversty in the UK, HWDT was established in 1994. It is a registered charity that has pioneered practical, locally-based education and monitoring programmes on cetaceans (whales, dolphins and porpoises) in the Hebrides.

It conducts long-term monitoring of cetacean distribution, abundance and habitat use; educates people about the marine environment, with a focus on cetaceans.

It works with local communities to ensure the long-term sustainability of the marine environment. The charity is based in Tobermory on the Isle of Mull, where it has its main education and research offices, a visitor centre and shop.

Why ‘The Silurian’?

HWDT’s research vessel is called the Silurian for good reason.

‘Silurian’is the word used to describe a geological period and system that ran from the end of the Ordovician period – around 444 million years ago, to the beginning of the Devonian Period – about 420 million years ago.

All geological periods are defined by the specific rock beds that mark their beginning and their transition to a succeeding period but the exact dates of their starts and ends have a margin of error of several million years.

The start of the Silurian period is set at a major extinction event when 60% of marine species were wiped out. So naming the research boat, ‘Silurian’, is a clear statement of HWDT’s concerns for species threatened with extinction.

Then there is a  significant evolutionary milestone that took place during the Silurian period. Jawed and bony fish began to appear.

The photograph at the top shows a medium sized basking shark, swimming alongside HWDT’s research vessel, Silurian.  © HWDT and reproduced here with permission.

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2 Responses to HWDT’s cetacean surveys show imperative to conserve healthy west coast waters

  1. Ontop of the admirable work of the HWDT’s…SHN’s support of Exeter Universitys is also a driver for preservation and sustainable management of the west coast waters.
    SNH recieved reports from a helicopter in June of hundreds of basking sharks around Skerryvore…this followe on from last years sightings of over 900 basking sharks off Sandaig ( again the Skerryvore area) by the Exeter Uni tagging vessel…

    It is important that local fishing fleets are consulted on sustainable management of the area…if anybody knows the sea…its the folk who risk their lives to put the fish on our tables…

    Anyways…another great Christmas present.

    Like or Dislike: Thumb up 2 Thumb down 0

  2. Pingback: HWDT's cetacean surveys show imperative to conserve healthy west coast waters – For Argyll

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