Publications by authors named "M Claereboudt"
Article Synopsis
- This study explores the year-round aggregation behavior of sea cucumbers, highlighting that it occurs not only during the prespawning period but also among adults in sea-based pens and juveniles in labs, which may influence disease spread and resource use in aquaculture.
- Through olfactory experiments, researchers found that sediment and water conditioned by other sea cucumbers enhanced attraction in juveniles, demonstrating the importance of chemical signals in their social behavior.
- A specific pheromone profile consisting of disaccharide saponins was identified, facilitating intraspecific recognition; however, this attraction diminished in starved individuals, indicating a more complex role for saponins beyond mere toxicity.
Article Synopsis
- Correctly defining species and populations is essential for understanding connectivity, adaptation, and conservation, especially in organisms like Scleractinian corals that have limited distinguishing features.
- The study used RAD-sequencing to examine genetic differences and structure in Pocillopora spp. from Oman and French Polynesia, testing species hypotheses and site genetic variation.
- Findings showed significant genetic differentiation between samples from the two regions, but little differentiation within those regions, highlighting the presence of clonal lineages and discussing how clonality affects genetic diversity.
Echinoderms form a remarkable phylum of marine invertebrates that present specific chemical signatures unique in the animal kingdom. It is particularly the case for essential triterpenoids that evolved separately in each of the five echinoderm classes. Indeed, while most animals have Δ-sterols, sea cucumbers (Holothuroidea) and sea stars (Asteroidea) also possess Δ and Δ-sterols, a characteristic not shared with brittle stars (Ophiuroidea), sea urchins (Echinoidea), and crinoids (Crinoidea).
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- The Indian Ocean Dipole (IOD) has become more intense due to global warming, but its behavior during the global-warming hiatus from the late 1990s to 2015 is not well understood.
- A 26-year study of coral from the Gulf of Oman revealed a major shift in 1999, indicating increased upwelling in the region, which altered the typical IOD pattern.
- This change suggests that during the hiatus, stronger Walker circulation affected upwelling in the Western Indian Ocean, leading to a disconnect from the IOD dynamics.
We used a high-resolution oxygen isotope (δO), carbon isotope (δC) and Sr/Ca ratios measured in the skeleton of a reef-building coral, Porites sp., to reveal seasonal-scale upwelling events and their interannual variability in the Gulf of Oman. Our δC record shows sharp negative excursions in the summer, which correlate with known upwelling events.
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