Les huîtres creuses sont vulnérables aux pesticides, qui les affectent sur plusieurs générations. C’est ce que montre une vaste étude de l’Ifremer, qui a voulu évaluer l’effet cocktail produit sur le mollusque par un mélange de pesticides couramment retrouvé dans les milieux naturels. Les résultats suggèrent qu’il y a urgence à repenser la façon dont sont menées les études d’écotoxicité.
Some mixtures of photosynthetic inhibitor herbicides have synergistic effects on the inhibition of the photosynthetic electron transport. Light-sensitive photoprotective ability is involved in the tolerance to single pesticides. Phytoplankton are likely to be simultaneously stressed by light intensity fluctuations and pesticide mixtures in aquatic ecosystems. However, the effect of light intensity on the toxicity of mixed pesticides is very limit [...]
In intertidal rocky shores, sessile organisms are subject to local variations due to a complex interplay of physical and biological drivers. Here, we examined the patterns and the dynamics of distribution of a key benthic ecosystem-engineer species, the mussel Mytilus galloprovincialis. We characterized areas of loss, gain, and persistence of mussel space occupancy using drone images with a resolution of one centimeter across two rocky shores spa [...]
Grey seals (Halichoerus grypus) feeding on fishery catches, a behavior termed “depredation”, is a major socio-economic and environmental issue in many regions of the north Atlantic. In northern Brittany, seals depredating on monkfish in static nets (gillnet and trammel net) is increasingly reported as problematic, but the issue has yet to be assessed and understood. In this study, we monitored 795 net sets between 2016 and 2018 to i) quantify the [...]
This study aimed to examine the spatial organization of pelagic communities within the water column along a horizontal gradient extending from the coast to the offshore area, categorized into three zones: inshore, offshore, and transition. A total of 29,000 nautical miles of acoustic transects collected during 14 annual standardized surveys were analyzed using two complementary acoustic methods: (i) extraction of sound scattering layers (SSL) and [...]
The Community Trajectory Analysis Framework was used in conjunction with conventional methods to analyse, characterize, and represent long-term functional changes in soft sediment communities in the Rance basin (Normano-Breton Gulf) sampled in 1976, 1995, 2010, and 2020, in connection with the operation of the Rance Tidal Power Station (RTPP). The results of this study have shown a functional stability of assemblages in the downstream/median area [...]
The global accumulation of plastic debris in marine ecosystems is continually increasing. Understanding the interaction between these debris and the bacterial biofilm on their surface is essential, particularly with regard to potential human pathogenic bacteria (PHPB). In this meta-analysis, we re-evaluated 16S rRNA metabarcoding data from 35 plastisphere-related studies, published up to late 2022. We compared the bacteriomes of plastics and othe [...]
In coastal areas, various types of biological and anthropic structures significantly influence the flow and related sediment dynamics. In this paper we have developed a generic flow-obstruction module, designed to represent both upward or downward, rigid or flexible structures, using a limited number of parameters. This module can be integrated to any hydrodynamic coastal model. The obstruction/flow interactions module can operate either in 3D or [...]
Offshore wind farms (OWF) are a rapidly expanding renewable energy source, but their effects on marine wildlife need further investigation. These infrastructures form new artificial habitats that may modify the behaviour and spatial distribution of fish species. Among the species likely to be affected, benthic sharks occupying coastal habitats are particularly exposed to the development of OWF, especially as electrosensitive species. This study u [...]
At the turn of the last century, Senegal experienced a spectacular invasion of the Nigerian gerbil (Gerbillus nigeriae). In less than 20 years, the species could be spotted in almost all areas of the northern half of the country, where it was previously undetected. In an effort to decipher the modalities of this invasion, we incorporated available information about the environment and gerbils' life traits into a simulation model and attempted to [...]
The way artisanal fishermen use natural resources is highly adaptable in space and time. In the Amazon region, the spatial distribution of the tropical fishing fleet is influenced by various environmental and anthropogenic variables. Environmental variables include river level variation, which affects accessibility to different habitats and species during seasonal changes, such as the flood pulse characterized by dry and wet phases, and interannu [...]
Long-finned squids are among the valuable resources exploited by English Channel demersal fisheries. This resource consists of two short-lived species (not distinguished by fishers): Loligo forbesii and Loligo vulgaris, which differ in the timing of their life cycle.In the present study, we investigated spatial, seasonal and long-term biomass variation of Loligo spp. in the English Channel using 22 years (2000-2021) of commercial fishing data to [...]
Despite the relatively small proportion of ocean surface they represent, continental shelf ecosystems are among the most productive in the world. Located at the interface between terrestrial and marine environments, these habitats are structured by strong environmental forcings, especially on the sea bottom. A clear understanding of the spatial distribution of these habitats, along with knowledge on the composition and functioning of their associ [...]
Lactococcus carnosus CNCM I-4031 is a psychrotrophic lactic acid bacterium used for the biopreservation of seafood. It effectively inhibits the growth of spoilage and pathogenic bacteria, such as Listeria monocytogenes, through an atypical mechanism that relies on direct cell-to-cell contact, without producing conventional antimicrobial compounds like bacteriocins. However, the precise molecular mechanism behind this bacterial interaction remains [...]
The aim of this study was to compare the impact of three aquaculture production systems on the biodiversity and productivity of aquatic invertebrates. We compared two conventional fishpond designs (extensive and semi-intensive) with a new design combining a semi-intensive carp polyculture fishpond with a planted lagoon, called coupled semi-intensive design. All fishponds were stocked with the same proportions of common carp, roach, and Eurasian p [...]
The spatialisation of essential biodiversity variables is a crucial step in assessing the health of coral reefs. However, few studies propose a comprehensive method for a large-scale assessment, such as coral reefs around Reunion Island. This requires a trade-off between the area, the study time, and the number of sampled stations needed to achieve spatial interpolations at an acceptable human and financial cost. We estimated nine sighting benthi [...]
The quality of aquatic ecosystems can be significantly impacted by the input of nutrients and trace elements. Identifying the sources and bioavailability of these components is crucial for understanding their cycling and assessing the environmental effects in lakes subjected to increased anthropogenic pressure, such as Lake Paranoá, a man-made reservoir in Brasília, Brazil. This study explores the spatial distribution and geochemical partitioning [...]
Fishes inhabiting the mesopelagic zone of the world's oceans are estimated to account for the majority of the world's fish biomass. They have recently attracted new attention because they are part of the biological carbon pump and have been reconsidered as a contribution to food security. Hence, there is an urgent need to understand how environmental conditions and species interactions shape their assemblages, and how they contribute to the funct [...]
Ocean waves are essential elements across the air‐sea interface, regulating momentum and energy transfer. The mixture of wind sea and ocean swell coupled with surface winds results in diverse sea state conditions that modify the local air‐sea interaction. Previous classifications of wind waves and swells are mostly binary that are insufficient to represent the complexity of sea states. In this study, we utilize wind and wave measurements from the [...]
Living benthic foraminifera, known as environmental bio-indicators of both natural and anthropogenic conditions in marine environments, were investigated in the coastal environment of Roscoff Aber Bay (Brittany, France). Eight sampling sites subject to natural variations (freshwater inputs, tides) and/or anthropogenic impacts (pollution, eutrophication) were studied over four seasons in 2021–2022 (November, February, May, August). We sought to un [...]
