Conservation charity the Hebridean Whale and Dolphin Trust said that from its research yacht Silurian, which was used in the BBC TV programme Blue Planet, volunteers and scientists spotted 2,303 common dolphins, 42 bottlenose dolphins and 94 Risso’s dolphins in its 2016 expeditions.
Trust director Alison Lomax said: “The impressive range of species documented in our at-sea surveys last year is a powerful reminder that Scotland’s west coast ocean environment is home to remarkable marine life.
The figures for all three species are the highest recorded in the charity’s annual surveys.
Average annual figures over the last 14 years recorded 463 individual common dolphins, 14 bottlenose dolphins and 12 Risso’s dolphins. For common dolphins, records range from zero in earlier field seasons to 1,862 during 2007.
Dr Lauren Hartny-Mills, science officer at the trust, said: “The reasons for the high number of sightings of these charismatic dolphin species and the broader effects on the marine environment and other species remain unclear.
“But the intriguing findings highlight the importance of ongoing monitoring and research to strengthen our understanding of what is taking place in Hebridean waters and to ensure well-informed conservation action.”
The latest findings came during a research season lasting from May to October, as part of the trust’s citizen science project monitoring whales, dolphins and porpoises – collectively known as cetaceans – and basking sharks in the area.
Last year saw 71 volunteers work with marine scientists on visual surveys and acoustic monitoring with underwater microphones or hydrophones, and identifying individual cetaceans through photography.
The charity, based on the Isle of Mull, now holds data from a surveyed area measuring more than 95,000km.
It aims to pass the 100,000km milestone during 2017 and recruits volunteers to work for two-week periods between April and September.
“Long-term scientific studies of this globally-important habitat and its inhabitants are crucial if we are to ensure a secure future for the Hebrides’ spectacular cetaceans.”
Chris went out of his way to avoid the threatened weather, with the happy result that the weather was much better than expected at this time of year. The team also arranged the itinerary to make sure that, where a guest had specific requests, these were accommodated (and without having a negative impact on the other guests). They tried very hard to show us as many species of wildlife as possible and to introduce us to areas and their history that we might not have been aware of. The guided walks were much more interesting than going on our own and the crew took great care in getting us all on and off shore, with radios for safety when we decided to split up. The presence of Hannah, in particular, made all the difference. Her knowledge of the local wildlife was exceptional and it was very interesting to hear about the islands and communities that we visited. She (and Chris) kept a look-out to make sure that anything of interest was highlighted to us on the voyage and her end of day wrap up reminded us of what we’d seen. Craig looked after us very well and seemed to be everywhere – he was certainly very hard working. I think that he cleaned the cabins as well – he definitely did a good job there. Along with Hannah, the meals that Izzy cooked were the best thing about the cruise for me. On a previous cruise (with another small company), the quality and service of the food (and the garrulous chef) spoiled the cruise for me. I was a little worried about this when I joined this cruise, but needn’t have been. Izzy was a great cook, providing a nice variety of well-cooked meals. Serving sizes were appropriate for the daily menus and we did not go hungry (or leave the table feeling too full). I looked forward to seeing what the next meal would be and also very much enjoyed her cakes. The whole team looked after us very well, but weren’t too obtrusive, allowing us to have quiet moments and to talk amongst ourselves.
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