E-Thesis 189 views 72 downloads
Parasitic Diseases of Crabs in Swansea Bay / GRACE CROCKER
Swansea University Author: GRACE CROCKER
Abstract
The digenean trematode Microphallus similis affects Cancer pagurus populations, influencing the ecological dynamics of this commercially important species. Therefore, understanding the factors that influence prevalence, and intensity is crucial for understanding crustacean disease dynamics. This stu...
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Swansea University, Wales, UK
2025
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| Institution: | Swansea University |
| Degree level: | Master of Research |
| Degree name: | MRes |
| Supervisor: | Davies, C. E., and Rowley, A. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa69882 |
| Abstract: |
The digenean trematode Microphallus similis affects Cancer pagurus populations, influencing the ecological dynamics of this commercially important species. Therefore, understanding the factors that influence prevalence, and intensity is crucial for understanding crustacean disease dynamics. This study investigated the prevalence, intensity, and identification of trematodes in C. pagurus at Mumbles Pier and Oxwich Bay, focusing on temporal variation, host sex, size and environmental conditions. Crabs were sampled from both locations, with analyses of M. similis using PCR (polymerase chain reaction). Microphallus similis was present at both sites, with greater prevalence in April and August, likely due to favourable temperatures and host availability. Although location was not statistically significant, prevalence was greater at Oxwich Bay, potentially due to favourable conditions.Size was associated with the presence of M. similis, but no biometric or environmental variables significantly influenced parasite severity at either site. Additionally, metacercariae size did not differ between locations. The study highlights the potential implications for C.pagurus populations and the broader ecosystem, including possible effects on species dynamics and ecological interactions. Future research should focus on the long-term effects of trematodes and their interactions with crustacean hosts, including how these dynamics may influence host health, population dynamics and ecosystem stability. |
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| Item Description: |
A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. |
| Keywords: |
Trematode, Microphallus similis, disease, parasites, PCR, phylogeny, edible crab, Cancer pagurus, Wales, Swansea Bay, Mumbles Pier, Oxwich Bay |
| College: |
Faculty of Science and Engineering |