Isolation and characterisation of 16 microsatellite loci from a widespread tropical hydrozoan, Lytocarpia brevirostris (Busk, 1852)

International audienceWe isolated and characterized 16 polymorphic microsatellite loci for Lytocarpia brevirostris (Aglaophe- niidae), a hydrozoan common in the tropical Indo-Pacific region. Four to 34 alleles per locus were detected at the Indo-Pacific scale. At the population level, observed (Ho) and expected (He) heterozygosities ranged across 0.100–0.625 and 0.097–0.597, respectively. Three markers showed significant deviation from Hardy–Weinberg equi- librium, all of them presenting null alleles. Linkage dis- equilibrium was detected in three pairs of loci among 120. These primers provide powerful tools for studying popu- lation genetic diversity and the implication of life cycle strategies on population differentiation in tropical hydro- zoans. This will be valuable for the conservation of coral reefs biodiversity and the design of marine protected areas

Isolation and characterisation of 26 microsatellite loci from a widespread tropical hydrozoan, Macrorhynchia phoenicea (Leptothecata, Aglaopheniidae), and cross-amplification in closely related species

International audienceWe isolated and characterized 26 microsatellite loci for Macrorhynchia phoenicea (Busk, 1852), a rather common tropical hydrozoan from the Indo-Pacific. The number of alleles per locus ranged from 4 to 24. The observed heterozygosity ranged from 0.000 to 0.970 and the expected heterozygosity from 0.029 to 0.833. Ten loci were at HardyeWeinberg equilibrium. No pair of loci presented linkage disequilibrium. Transferability of up to 18 loci was positive across four other Aglaopheniidae species from different genera. These loci will be used in studying reef population connectivity for these particular species at the scale of the Indo-Pacific, a promising but little explored research field

Morpho-molecular delineation of structurally important reef species, the fire corals, Millepora spp., at Réunion Island, Southwestern Indian Ocean

International audienc

Distribution, partitioning and fluxes of carbon and nitrogen in benthic communities from Glorioso Islands (Mozambique Channel)

PosterDistribution, partitioning and fluxes of carbon and nitrogen in benthic communities from Glorioso Islands (Mozambique Channel

Phylogenetic relationships within Aglaopheniidae (Cnidaria, Hydrozoa) reveal unexpected generic diversity

International audienceMorphology can be misleading in the representation of phylogenetic relationships, especially in simple organisms like cnidarians and particularly in hydrozoans. These suspension feeders are widely distributed in many marine ecosystems, and the family Aglaopheniidae Marktanner-Turneretscher, 1890 is among the most diverse and visible, especially on tropical coral reefs. The taxonomy of this family is based on morphological characters with emphasis on reproductive structures for the identification of genera. This study is the most comprehensive molecular phylogeny of the Aglaopheniidae to date, including six genera and 38 species, of which 13 were investigated for the first time and sampled on tropical coral reefs throughout the Indo-Pacific region. For newly sampled individuals, we sequenced the 16S rRNA, the nuclear locus comprising the complete ITS1-5.8S rRNA gene-ITS2 and the first intron of the calmodulin nuclear gene. Phylogenetic analyses of the data revealed and confirmed a general polyphyly, or doubtful monophyly, of all sampled genera in tropical regions based on both the mitochondrial and nuclear markers. Our results revealed that several morphological characters used today are unsuited to resolve phylogenetic relationships between species and genera, as well as the high phyletic diversity within this family. Future revision of the classification of this family will require extensive geographic sampling and the use of an integrative approach

Journal de la mission DHEEP aux îles Éparses, du 03 au 30 avril 2019

This log illustrates the activities of the DHEEP mission aboard R.V. Marion Dufresne in the Îles Éparses in April 2019. The objective of this mission was to collect the biological material dedicated to a study of the demographic history of the reef fauna of the western Indian Ocean. Collections of fire corals, giant clams, chitons, hermit crabs, brittle stars, sea cucumbers and fishes were made on the reefs of the Europa Islands, Juan de Nova, Glorieuses and Tromelin. Among the highlights of this mission were the collection of specimens of two new species of the fish genus Gymnocranius and the sampling of two rare giant clams currently under taxonomic revision, Tridacna elongatissima and T. rosewateri.Ce journal illustre le déroulement de la mission DHEEP à bord du N.O. Marion Dufresne, aux îles Eparses en avril 2019. L'objectif de cette mission était de récolter le matériel biologique nécessaire à l'étude de l'histoire démographique de la faune marine récifale de l’ouest de l’océan Indien. Des récoltes de millépores, tridacnes, chitons, bernard l’hermite, ophiures, holothuries et poissons ont été faites sur les récifs des îles Europa, Juan de Nova, Glorieuses et Tromelin. Parmi les événements marquants de cette mission sont la collecte de spécimens de deux nouvelles espèces de poissons du genre Gymnocranius et l’échantillonnage de deux tridacnes rares en cours de révision taxonomique, Tridacna elongatissima et T. rosewateri

Can coral reef communities be used as indicators or proxies to assess ecological vulnerability of WIO small islands? The case of Glorieuses Island (Mozambic Channel, Indian Ocean)

International audienceOral presentation about Can coral reef communities be used as indicators or proxies to assess ecological vulnerability of WIO small islands? The case of Glorieuses Island (Mozambic Channel, Indian Ocean

Artificial reefs as a tool to supply artisanal fishery in Reunion Island: Implementation and scientific evaluation

PosterInternational audiencePoster about Artificial reefs as a tool to supply artisanal fishery in Reunion Island: Implementation and scientific evaluatio