Defending food stocks one theory over Moray dolphin attack on porpoise

RESEARCHERS at The Sea Watch Foundation say they will investigate the cause of dolphin attacks on porpoises in the Moray Firth.

The rare event was capture by photographers Jamie Muny and Alister Kemp near Chanonry Point.

Now officials will look at whether competition for food stocks or other reasons could be behind the confrontations.

The group has also urged sea watchers to pass on any of their own sightings or look to volunteer with them.

Sea Watch Foundation is a national charity that monitors the numbers and distributions of whales, dolphins and porpoises around the British Isles,.

They were alerted to the bottlenose dolphin attacks upon porpoises last week.

Both photographers have studied  dolphins for over a decade and although they had heard about these attacks before, the May 9 and May 11 were unusual. 

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Pods of bottlenose dolphins were seen attacking harbour porpoises, with each attack lasting around five to 10 minutes.

On both occasions, the photographers thought the dolphins were throwing a large salmon up into the air, as they often feed on this species of fish in the area.

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It was only when they reviewed their images afterwards that they realised it was in fact a porpoise.

While being tossed in the air, the porpoise appeared motionless as the dolphin pushed it up out of the water with their beaks seemingly across the stomach. On one occasion, a dolphin appears out of the water with a porpoise resting on its beak.

“In the hundreds if not thousands of hours I’ve spent photographing the dolphins, I have never witnessed such an attack” said Alister.

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Jamie added: “I was saddened and shocked by the whole event and at the same time there is a feeling in my heart that tells me that I am lucky to have witnessed this very rare event but have no doubt it is something that I will not want see again, it was brutal.”

The first aggressive interactions between these two species in UK waters date back to the 1990s but they have since been reported on a number of occasions particularly in NE Scotland.

The reason for some bottlenose dolphins to kill porpoises is not fully known.

It is generally adult males that do the attacking, and sometimes they do so in a group of two or three animals.

The UK Cetacean Strandings Investigation Programme (CSIP) in collaboration with Sea Watch Foundation and other bodies have recorded 142 porpoises stranded-attacks by bottlenose dolphins spanning from 1991 to 2013, using stranding data for Wales.

And in East Scotland, the number is even higher.

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“The cause of these incidents is not clear but aggressive interactions could be due to the high co-occurrence of the two species which can result in competition over a shared food resource, occasionally leading to the death of the smaller species, although other theories have included misdirected infanticide.

“The changing testosterone levels in male dolphins could also influence the extent and seasonality of these attacks.

“The waters in the UK are incredibly rich for whales, dolphins and porpoises, and reporting sightings, whether they are of species displaying unusual behaviours or not, is a really important for Sea Watch as they are way to learn more about the many cetacean species occurring around the UK”, said Chiara Giulia Bertulli, Sightings Officer for Sea Watch Foundation.

WANT TO LEARN MORE? Read: Seawatch Foundation – submit your sightings

IMAGE CREDITS: Jamie Muny and Alister Kemp / Sea Watch Foundation

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