ABSTRACTS OF POSTERS –PHOTO ID
P 18 Post-release monitoring of grey seal (Halichoerus grypus) pups rehabilitated at the national Seal Sanctuary, cornwall, UK
Daniel S. Jarvis (1), Sue Sayer (2)
(1) National Seal Sanctuary (2) Cornwall Seal Group
tolroydave@aol.com
The National Seal Sanctuary has been rehabilitating rescued grey seal pups back to the wild for over 50 years. Every winter season since 1996-97, pups have been tagged with a small plastic roto-tag through the webbing of a rear flipper, which has a seasonal colour code and unique identifying number that should last their lifetime. Two other tag types have also been trialled, paint and hat tags, to increase public reporting. Paint tags were used in 2001-02 and each pup had a different colour and symbol painted on their head. Hat tags (pyramid-shaped plastic tag that was affixed to the fur on the head of each pup) were used in the 2003-05 seasons. Both methods were temporary, lasting a maximum of year until the seal moulted. Paint tags did not increase reporting rates so were not re-used. Hat tags did increase reporting rates, but the tags were decided to be unsuitable due to the method of attachment and their use discontinued. Cornwall Seal Group carries out monitoring and photo-identification of local wild seals by matching pelage patterns to track seals over time and between locations. As this method has been successful, a photo-ID catalogue for each season is now kept so photos can be matched back if the flipper tag is not seen. Of 491 seals released since 1996-97, 112 (23%) have been resighted, consisting of 576 records mainly from Southwest England, but also from the coasts of Wales, Ireland and northern France. This distribution matches the suspected range of this species in what is known as the “Celtic Fringe” population. Three rehabilitated females have been recorded breeding and successfully raising their own pups, demonstrating the success of the current post-release monitoring methods and of the rehabilitation process.
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