Laboratoire d’Océanologie et de Géosciences

Polycyclic Aromatic Hydrocarbons in Kenyan Coral Reef Sediments: Distribution, Sources, and Equivalent Ecological Risks

This study evaluated the spatial distribution, source apportionment, and equivalent ecological risk of polycyclic aromatic hydrocarbons (PAHs) in 18 surface sediments across four Kenyan coral reef ecosystems (Malindi, Watamu, Kilifi, and Mombasa-Nyali). Total PAH concentrations (...

Asymmetric bloom lengthening drives high-latitude ocean chlorophyll accumulation imbalance

Terrestrial ecosystems maintain a stable time-allocation budget between growth and senescence, but whether this applies to the ocean remains unclear. Using fused satellite LiDAR and ocean-color data (2007–2022), we show that marine phenology is variable and asymmetric. In high la...

A global consistent database of plankton and detritus from in situ imaging by the Underwater Vision Profiler 5

Plankton and detritus are essential components of the Earth's oceans influencing biogeochemical cycles and carbon sequestration. Climate change impacts their composition and fluxes, and marine ecosystems as a whole. To improve our understanding of these changes, standardized obse...

Estimating isotopic turnover rates using DEB theory

The isotopic turnover rate (λ) quantifies the rate at which an organism’s tissues are renewed. It is a key parameter in dietary studies as it governs predator-prey dynamics and by extension the broader food web. However, λ has historically been difficult to estimate, typically re...

Intra- and inter-specific variability in benthic foraminifera modulates surface sediment reworking

Abstract Bioturbation is a key ecological process that regulates benthic ecosystem functioning, including organic matter remineralization and nutrient regeneration. Despite growing evidence that meiofauna, and benthic foraminifera in particular, contribute to sediment bioturbatio...

Paleoenvironmental and paleoclimatic reconstruction in the Western Mediterranean during the Late Early Pleistocene

Abstract. The major climate change recorded during the Early-Middle Pleistocene Transition (1.4–0.4 Ma) is characterized by an increase in the length of climatic cycles from 41 to 100 ka. During this period, the Mediterranean climate underwent aridification associated with a drop...

Identification of living (Rose Bengal)-stained benthic foraminifera using automated image recognition

Abstract. Living and fossil benthic foraminifera are widely used as bioindicators of ecosystem quality, but their analysis is time-consuming. With the help of artificial intelligence, models for the automatic identification of fossil planktonic foraminifera and, more recently, be...