Projecting and managing the future response of invasive species to global change requires a mechanistic understanding of how climate and ecology jointly drive species demography and range dynamics. Here, we use mark-recapture in replicated outdoor mesocosms to examine how survival and dispersal, two key drivers of demography and range dynamics, respond to climate and ecology in the invasive red swamp crayfish (Procambarus clarkii) along an invasi [...]
Ciguatera poisoning (CP) is caused by the consumption of marine products contaminated with ciguatoxins (CTXs) produced by dinoflagellates of the genus Gambierdiscus. Analytical methods for CTXs, involving the extraction/purification of trace quantities of CTXs from complex matrices, are numerous in the literature. However, little information on their effectiveness for nonpolar CTXs is available, yet these congeners, contributing to the risk of CP [...]
Background Vector-borne diseases cause morbidity and mortality globally. However, some areas are more impacted than others, especially with climate change. Controlling vectors remains the primary means to prevent these diseases, but new, more effective tools are needed. The World Health Organization (WHO) prioritized evaluating novel control methods, such as sterile insect technique (SIT) for control of Aedes-borne diseases. In response, a multia [...]
Ectotherm’s vulnerability to climate change is predicted to increase with temperature variations. Still, translating laboratory observations of organisms’ heat stress responses to the natural fluctuating environment remains challenging. In this study, we used an integrative framework combining insights from the TDT curves and physiological reaction norms, to precisely capturePinctada margaritiferastage -specific thermal tolerance. On a second han [...]
The Recharge Oscillator (RO) is a simple mathematical model of the El Niño Southern Oscillation (ENSO). In its original form, it is based on two ordinary differential equations that describe the evolution of equatorial Pacific sea surface temperature and oceanic heat content. These equations make use of physical principles that operate in nature: (i) the air-sea interaction loop known as the Bjerknes feedback, (ii) a delayed oceanic feedback aris [...]
Paracas Bay, located in the Humboldt Current system, is a highly variable coastal environment where hypoxia (dissolved oxygen concentrations <2 mg L−1) has been reported as a persistent feature of bottom conditions. In addition to hypoxia, milky water events have been reported in the bay, most likely associated with the presence of sulfides (i.e. sulfidic events), including toxic hydrogen sulfide (H2S). This study is the first report of sulfide c [...]
We describe new observations of the oceanic carbonate system in the South-Western Indian Ocean obtained in January 2021 (OISO-31 cruise) and May 2022 (RESILIENCE cruise). To evaluate the decadal trends and drivers of fugacity of CO2 (fCO2), air-sea CO2 fluxes, dissolved inorganic carbon (CT) and pH, we used available data in this region over 1963-2023 and compared the results in the Mozambique Basin and in the Agulhas region near the African coas [...]
The ongoing biodiversity crisis calls for a complete biodiversity inventory of marine and terrestrial ecosystems. The task is particularly challenging for fragmented island territories, where baseline biodiversity information is often difficult to procure. By centralising information from different sources (museums, research institutions, citizen scientists), ‘big-data’ platforms provide an opportunity to evaluate species biodiversity information [...]
Along-track and gridded altimetric observations of sea level are colocated and combined with data from drifter observations and wind reanalysis to reconstruct global instantaneous near-surface horizontal momentum balance. This reconstruction includes not only geostrophic terms, but also Lagrangian accelerative terms and turbulent stress terms. The methodology developed quantifies the degree of closure, distinguishes balanced signals from errors, [...]
Knowledge of the spatiotemporal behavior and interactions with fishing gear of bycatch species is essential to improve conservation and fisheries management strategies. We analyze fine-scale data from onboard observers, covering 25 fishing fleets from 2002 through 2018, to assess temporal trends and spatial variation in sea turtle bycatch in longline and purse seine tuna fisheries in the Atlantic and Indian oceans. For the spatial analysis, we us [...]
Many taxa around the globe are threatened by often unexplained mass mortality events (MMEs), which can decimate populations and compromise key ecosystem functions. One example of a highly threatened taxon facing frequent MMEs is freshwater mussels (Unionida). There has been a recent increase in interest in understanding the causes of freshwater mussel MMEs, but standardised methodologies for how best to respond to them to facilitate diagnoses are [...]
Since 2011 significant strandings of holopelagic Sargassum spp. have caused environmental, public health and socio-economic issues, particularly in the French West Indies. This study aimed to analyse the fatty acid composition of neutral and polar lipid fractions in three Sargassum morphotypes: Sargassum fluitans var. fluitans, S. natans var. natans, and S. natans var. wingei, sampled from nearshore, bay, and stranded locations. Total fatty acid [...]
Citizen Science initiatives have a worldwide impact on environmental research by providing data at a global scale and high resolution. Mapping marine biodiversity remains a key challenge to which citizen initiatives can contribute. Here we describe a dataset made of both underwater and aerial imagery collected in shallow tropical coastal areas by using various low cost platforms operated either by citizens or researchers. This dataset is regularl [...]
On les nomme « marées vertes », amer clin d’œil aux marées noires. Voilà plus de cinquante ans que la prolifération d’algues vertes dans certaines baies de la côte bretonne suscite d’âpres conflits sans que l’on s’interroge, finalement, sur ce qu’ils révèlent… Sous ce tapis d’algues se cache entre autres une mise à l’épreuve des solidarités locales. Entretien avec Alix Levain, anthropologue, chargée de recherche CNRS, membre du projet ANR Greense [...]
Molecular data from 35 of the 50 Acrossocheilinae species suggest that the species-level diversity in the subfamily has been overestimated, likely due to inadequate taxon and geographic sampling and reliance on morphological characters that vary intraspecifically. Three new genera, one resurrected genus, two resurrected species, and one new species are diagnosed and described herein. Nine synonyms of three valid species of Acrossocheilinae are re [...]
We report the first high-precision temperature measurements of individual methane seeps in the Zelenka methane seep field, achieved with an accuracy of 0.003 degrees C, a sensitivity of 0.001 degrees C, and a sampling interval of 2 seconds. This paper reviews previous Bulgarian research on underwater gas seeps, with a particular focus on the extensively studied shallow methane seep field at Zelenka, located west of Cape Kaliakra. We discuss the f [...]
