PhD Research: Combining local fisheries knowledge with novel ecological survey methods to identify and understand critical elasmobranch habitats and their threats
Most elasmobranch (shark and ray) conservation strategies require prior knowledge of elasmobranch habitat-use and preferably at crucial developmental stages (e.g. neonates, juveniles, pregnant females). However, this knowledge is generally limited and difficult to obtain. This PhD project aims to bridge the gap between traditional ecological survey methods (e.g. BRUVs, telemetry, fisheries data) and social science methods, using local ecological knowledge in fishing communities to refine ecological survey design and better understand elasmobranch habitat-use in the Southwest UK.
By engaging with fishing communities through semi-structured interviews, this research will tap into local knowledge passed down through generations to gain insights into elasmobranch habitats (past and present) and seasonal movements, at different life stages. Interview data will be coupled with additional data sources (e.g. catch-release data) to create a broad overview of elasmobranch habitats in Devon and Cornwall. This overview will underpin the use of conventional ecological survey techniques, such as telemetry and video methods. Ecological surveys, delivered in collaboration with local anglers, will then be used to characterise higher resolution elasmobranch movement in key areas, relative to habitat features and threats to inform future conservation management.
One area of interest is the offshore mussel farm in Sidmouth which is thought to be an important habitat for thornback rays (Raja clavata) and will be examined with acoustic telemetry to determine fine-scale movement behaviour. In-situ ultrasonography methods will also be developed and validated to complement these surveys and to determine the presence and behaviours of pregnant female elasmobranchs in Devon and Cornwall.