Study of parasites of introduced and indigenous fish fauna in Corsica
With 3,000 km of waterways, Corsica has a particularly dense and complex hydrographic network. This complexity is compounded by the complexity of current fish populations, which is the result of successive waves of species introductions into the island's rivers and reservoirs. Although Corsica&...
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| Other Authors: | , , , , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | French |
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HAL CCSD
2024
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| Subjects: | |
| Online Access: | https://theses.hal.science/tel-04634732 https://theses.hal.science/tel-04634732/document https://theses.hal.science/tel-04634732/file/these_esposito_anais.pdf |
| Summary: | With 3,000 km of waterways, Corsica has a particularly dense and complex hydrographic network. This complexity is compounded by the complexity of current fish populations, which is the result of successive waves of species introductions into the island's rivers and reservoirs. Although Corsica's native fish fauna is poorly diversified (only four species), more than twenty introduced species have artificially increased this diversity since the end of the 19th century. The impacts of introduced species on aquatic ecosystems are multiple (e.g., competition, predation, habitat modification, genetic impacts) and among these, the co-introduction of pathogens, including parasites, is of particular concern and still too poorly documented. Moreover, it is interesting to approach this type of subject in an insular environment. The work presented here therefore aims to determine the composition of the parasitofauna of native and introduced fish in Corsica, to assess its richness, to determine whether transfers of parasites from introduced fish to native fish have occurred, and whether the parasites present are likely to have an impact in terms of animal or human health. Sampling campaigns were carried out on a selection of native species (Anguilla anguilla, Salmo trutta, Salariopsis fluviatilis and Atherina boyeri) and introduced species (Phoxinus minnows, Perca fluviatilis, Squalius cephalus and Gobio spp.), four of which were particularly targeted for their accessibility and the parasitological problems they presented. The work carried out enabled us to determine the composition of A. anguilla parasite communities in two lagoons on the eastern plain and, for the first time, in numerous watercourses throughout the island. In addition, this work has highlighted the presence throughout Corsica of invasive parasites: the Monogenea Pseudodactylogyrus bini and P. anguillae and the Nematoda Anguillicola crassus, as well as their maintenance and the increase in their prevalence and abundance in the Biguglia lagoon since the ... |
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