

FOLLOWUS
1.Department of Agricultural & Food Science, Faculty of Agriculture, University of Mauritius, Réduit 80837, Mauritius
2.Department of Biosciences & Ocean Studies, Pole of Research Excellence Sustainable Marine Biodiversity, Faculty of Science, University of Mauritius, Réduit 80837, Mauritius
would like to thank the University of Mauritius for a postgraduate scholarship and logistics and Mr. Le Court de Billot for his support. The authors also thank the Ministry of Defence and Rodrigues for sampling permits within the Republic of Mauritius and the staff of the South East Marine Protected Areas (SEMPA) for their help in sample collection.
Received:17 August 2022,
Accepted:10 January 2023,
Online First:16 January 2023,
Published:03 January 2024
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AH SHEE TEE Lisa,APPADOO Chandani,PUCHOOA Daneshwar,et al.Research PaperAn updated inventory of marine opisthobranch (Mollusca, Gastropoda) from the territorial waters of the Republic of Mauritius[J].Journal of Oceanology and Limnology,2024,42(01):226-243.
AH SHEE TEE Lisa,APPADOO Chandani,PUCHOOA Daneshwar,et al.Research PaperAn updated inventory of marine opisthobranch (Mollusca, Gastropoda) from the territorial waters of the Republic of Mauritius[J].Journal of Oceanology and Limnology,2024,42(01):226-243. DOI: 10.1007/s00343-023-2300-9.
Island ecosystems support diverse aquatic invertebrate communities comprising endemic taxa. Documentation of existing species is important for conservation. In this study
a checklist of marine opisthobranch from the Republic of Mauritius is presented. A combination of benthic surveys (50 m×5 m in triplicates)
rover diving techniques and photo documentation were used over two years (2018–2020) within 35 sheltered and unsheltered lagoons. Morphological and molecular analysis were used for identification. Species composition within sheltered and unsheltered areas in Mauritius was estimated using the Bray-Curtis similarity. The checklist featured 117 species belonging to 61 genera and 28 families
of which 13 are new records. The findings increased the knowledge of opisthobranch diversity from the Mauritius by 15.4%. Among the listed species
the distribution range of
Cyerce nigra
Actinocyclus papillatus
and
Phyllidia picta
extended from the Western Pacific to the South Western Indian Ocean. Molecular analysis of the undescribed
Gymnodoris
sp. showed it resembled
Gymnodoris
sp. from Hawaii and were different by a genetic distance value of 10.6%. The species richness and evenness were higher within the sheltered regions of Mauritius which harboured the food resource of opisthobranch. These areas as compared to unsheltered regions were heavily populated
suggesting the probable influence of wave actions on opisthobranch diversity and abu
ndance. The order Nudibranchia was reported as most speciose
with 86 species. The Sacoglossa and Nudibranchia were observed only on macroalgae and sponges respectively. High abundance was also recorded on shipwrecks which are the most common form of artificial reefs. With the inclusion of observations from previous studies
201 species belonging to 94 genera and 36 families are now known from the Mauritius.
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