@article {9903, title = {Settlement patterns and temporal successions of coral reef cryptic communities affect diversity assessments using autonomous reef monitoring structures (ARMS).}, journal = {Sci Rep}, volume = {14}, year = {2024}, month = {2024 Nov 07}, pages = {27061}, abstract = {

Autonomous Reef Monitoring Structures (ARMS) are used worldwide to assess cryptic diversity, especially on coral reefs. They were developed as standardised tools, yet conditions of deployment, such as immersion duration and/or deployment and retrieval seasons, vary among studies. Here we studied temporal and seasonal variability in coral reef cryptic communities sampled with 15 ARMS on a single coral reef slope site at Reunion Island, Southwest Indian Ocean. Settlement patterns and temporal succession of Eukaryote communities were investigated across three immersion times (6\ months, 1\ year, 2\ years), two immersion seasons (hot vs. cool) and three fractions (500-2000\ μm, 106-500\ μm, sessile) using two genetic markers (18S, COI). Both markers detected different taxa with different resolutions, but broadly similar patterns of community composition and structure. While OTU diversity of communities did not change with immersion time and season, these parameters significantly affected community structure and composition. Our results showed a decrease of the similarity of ARMS communities with duration of immersion, and a strong temporal turnover of species with only a small proportion of the diversity persisting over time. The small proportion of OTUs assigned at phylum level highlights the uniqueness of the Mascarene cryptobiome.

}, keywords = {Animals, Anthozoa, Biodiversity, Coral Reefs, Environmental Monitoring, Indian Ocean, Seasons}, issn = {2045-2322}, doi = {10.1038/s41598-024-76834-8}, author = {Cou{\"e}del, Marion and Dettai, Agn{\`e}s and Guillaume, Mireille M M and Bonillo, C{\'e}line and Frattini, Baptiste and Bruggemann, J Henrich} } @article {9640, title = {Accounting for variability in life-history traits for the definition of amphidromous goby fry fisheries closure periods}, journal = {Cybium}, volume = {47}, year = {2023}, month = {10/2023}, pages = {391-399}, abstract = {Amphidromous goby fry (post-larvae and young juveniles) are traditionally fished when they arrive in rivers after their larval development at sea. In Reunion Island (Indian Ocean) two species of amphidromous goby are mainly targeted by the fisheries: the endemic\ Cotylopus acutipinnis\ and the cosmopolitan\ Sicyopterus lagocephalus. Despite the lack of quantitative data on these fisheries, their impact on populations\ is expected to be important because the catches can represent several tonnes per year. Consequently, fishery regulation changes have been proposed that increase the duration of the existing fisheries closure period of two weeks in March. We developed an approach to identify key periods for fisheries closure, including assessment of the proposed management scenario and several alternative protection scenarios, based on the maximization of fry abundance and on the variability of four life-history traits: (i) fry size and (ii) age at arrival in rivers, (iii) the time the juveniles spend in river before maturation and (iv) their migration behaviour. This approach is in seeking to preserve a high level of phenotypic diversity, which is predicted to promote population resilience. We conducted a multiple-criteria decision analysis to rank 4096 alternatives of fisheries closure periods, ranging from zero to 12 months, based on their propensity to maintain fry abundance and life history trait diversity. Finally, according to the type of fisheries closure period (discontinuous or continuous) and the proportion of annual abundance and variability of life-history traits preserved during the period (50\% or 75\%), we propose four different fisheries closures lasting from six to nine months.}, keywords = {amphidromy, Bichiques, Conservation, diadromy, Indian Ocean, Management, recruitment}, doi = {10.26028/cybium/2023-018}, url = {https://sfi-cybium.fr/fr/accounting-variability-life-history-traits-definition-amphidromous-goby-fry-fisheries-closure}, author = {Lagarde, Rapha{\"e}l and Valade, Pierre and Teichert, Nils} } @article {6663, title = {Multi-trace-element sea surface temperature coral reconstruction for the southern Mozambique Channel reveals teleconnections with the tropical Atlantic}, journal = {Biogeosciences}, volume = {16}, year = {2019}, pages = {695-712}, abstract = {Here we report seasonally resolved sea surface temperatures for the southern Mozambique Channel in the SW Indian Ocean based on multi-trace-element temperature proxy records preserved in two Porites sp. coral cores. Particularly, we assess the suitability of both separate and combined Sr/Ca and Li/Mg proxies for improved multi-element SST reconstructions. Overall, geochemical records from Europa Island Porites sp. highlight the potential of Sr/Ca and Li/Mg ratios as high-resolution climate proxies but also show significant differences in their response at this Indian Ocean subtropical reef site. Our reconstruction from 1970 to 2013 using the Sr/Ca SST proxy reveals a warming trend of 0.58 {\textpm} 0.1 {\textbullet} C in close agreement with instrumental data (0.47 {\textpm} 0.07 {\textbullet} C) over the last 42 years (1970-2013). In contrast, the Li/Mg showed unrealistically large warming trends, most probably caused by uncertainties around different uptake mechanisms of the trace elements Li and Mg and uncertainties in their temperature calibration. In our study, Sr/Ca is superior to Li/Mg to quantify absolute SST and relative changes in SST. However, spatial correlations between the combined detrended Sr/Ca and Li/Mg proxies compared to instrumental SST at Europa revealed robust correlations with local climate variability in the Mozambique Channel and teleconnections to regions in the Indian Ocean and southeastern Pacific where surface wind variability appeared to dominate the underlying pattern of SST variability. The strongest correlation was found between our Europa SST reconstruction and instrumental SST records from the northern tropical Atlantic. Only a weak correlation was found with ENSO, with recent warm anomalies in the geochemical proxies coinciding with strong El Ni{\~n}o or La Ni{\~n}a. We identified the Pacific-North American (PNA) atmospheric pattern , which develops in the Pacific in response to ENSO, and the tropical North Atlantic SST as the most likely causes of the observed teleconnections with the Mozambique Channel SST at Europa.}, keywords = {Anthozoa, Atlantic Ocean, Atlantic Ocean (North), Atlantic Ocean (Tropical), climate variation, coral, El Nino, El Nino-Southern Oscillation, Europa Island, Indian Ocean, La Nina, Mascarene Islands, Mozambique Channel, Pacific Ocean, Pacific Ocean (Southeast), Porites, proxy climate record, reconstruction, Reunion, sea surface temperature, subtropical region, surface wind, teleconnection, trace element}, issn = {17264170}, doi = {10.5194/bg-16-695-2019}, url = {https://www.biogeosciences.net/16/695/2019/}, author = {Zinke, J. and D{\textquoteright}Olivo, J.P. and Gey, C.J. and McCulloch, M.T. and Henrich J Bruggemann and Lough, J.M. and Mireille M.M. Guillaume} } @article {6041, title = {Phylog{\'e}ographie de Neritina stumpffi Boettger, 1890 et Neritina canalis Sowerby, 1825 (Gastropoda, Cycloneritida, Neritidae)}, journal = {Zoosystema}, volume = {41}, year = {2019}, pages = {237-248}, abstract = {

The population genetic structure of Neritina stumpffi Boettger, 1890 in the Indo-Pacific and Neritina canalis Sowerby, 1825 in the Pacific Ocean were investigated using a fragment of the mitochondrial COI gene. The haplotype network of N. stumpffi showed a genetic structuration between the two oceans, with shared haplotypes. Concerning N. canalis, western Pacific and central Pacific populations are genetically structured, without shared haplotypes. The Coral Triangle appears to have played a filtering barrier role for N. stumpffi, whose presence in both oceans could be explained by the flow of the south-equatorial current. A barrier to the dispersal of N. canalis between the western and the central Pacific may also exist.

}, keywords = {COI gene, Indian Ocean, larval dispersion, Pacific Ocean, Phylogeography}, author = {Ahmed Abdou and Clara Lord and Philippe Keith and Ren{\'e} Galzin} }