Two decades of data on the neurotoxic Gymnodinium catenatum dynamics and paralytic shellfish toxins contamination of molluscs in the southwestern Mediterranean: What have we learned?

Leblad Benlahcen Rijal, Amnhir Rachid, Maamour Niama, Haddouch Asia ben, Hormat-Allah Amal

Harmful algal blooms have been documented in the Moroccan Western Mediterranean region since 1993, primarily associated with the presence of paralytic shellfish toxins (PSTs) produced by the dinoflagellate Gymnodinium catenatum. The proliferation of this neurotoxic species has led to recurring bans on the harvesting of molluscs, resulting in significant socio-economic repercussions and threats to human health. In the present study, we examine the [...]

Wang Tong, Ng Hong Chin, Hatton Jade e., Hammond Samantha j., Woodward E. malcolm s.

Accelerated mass loss from the Greenland Ice Sheet leads to retreating glaciers and enhanced freshwater runoff to adjacent coastal regions, potentially providing additional essential nutrients, such as silicon, to downstream primary producers. However, the role of fjordic sediments in modulating the supply of silicon from glacial environments to marine ecosystems remains poorly constrained, particularly for the quantification of silicon fluxes fr [...]

Van vu Sang, Kumar Manoharan, Rastas Pasi, Boudry Pierre, Gheyas Almas

This study elucidates to generate a linkage map for Portuguese oysters, Crassostrea angulata, and recognise potential markers linked to economical traits in C. angulata. Genome-wide association studies (GWAS) using 19,475 single nucleotide polymorphisms (SNPs) generated by a genotyping-by-sequencing approach consisting of 647 individuals in two selection generations of C. angulata, consisting of 57 full-sib family of the first generation and 33 f [...]

Major natural hazards in recent decades have led to a revisiting of the concept of resilience, particularly in order to analyze traditional models of response to an unforeseen event and post-crisis management mechanisms. For resilience to be an applicable/operational concept to guide management and inform decisions, it must ultimately be characterized for its assessment. This assessment can be done through the identification of indicators specifi [...]

From formulae, via models to theories: Dynamic Energy Budget theory illustrates requirements

Kooijman Sebastiaan A.l.m., Kearney Michael r., Marn Nina, Sousa Tânia, Domingos Tiago

As sciences mature, they transition from observation and description to explanation and prediction. This transition is associated with qualitative changes in the way quantitative mathematical formulations are constructed and interpreted, resulting in a ‘theory’. Such transitions from phenomenology to theory are happening in biology but the heuristic framework involved is rarely articulated. We here describe how the use of models in research sets [...]

Baudet Jean-Baptiste, Xuereb Benoît, Schaal Gauthier, Rollin Marc, Poret Agnès

In crustaceans that live in seasonal environments and produce several broods during an annual cycle, there are generally seasonal patterns in reproductive traits. Thus, females are able to modulate the trade-off between per offspring investment and quantity of eggs produced in order to maximise the fitness of their offspring in response to the environmental conditions they will face during their development. We collected females of Palaemon serra [...]

Klotz Adrien n., Almar Rafael, Quenet Yohan, Bergsma Erwin W.j., Youssefi David

Accurate nearshore bathymetry estimation remains a critical challenge, impacting coastal forecasting evolution assessments through the inaccuracies in both in-situ and remote sensing surveys. This article introduces the Satellite Derived Bathymetry (SDB) temporal correlation method, showcasing its ability in deriving accurate nearshore bathymetry from one minute spaceborne videos. The approach utilises correlation of pixel intensity time series, [...]

Cossu F., Makarova E., Rabaneda A. s., Portabella M., Tenerelli Joseph

In the framework of the MAXSS project, a multi-mission (MM) wind product under tropical cyclone conditions has been generated for the period 2010-2020, i.e., a synergistic product that combines the European Center for Medium-range Weather Forecast fifth reanalysis (ERA5) output with several scatterometer and radiometer wind data adjusted to the wind scale of hurricane hunter in situ observations. The errors of the satellite and MM wind products h [...]

The International Sampling Program: continent of origin and biological characteristics of Atlantic salmon (Salmo salar) collected at West Greenland in 2020 and 2021

Sheehan Timothy f., Gargan Paddy, Kerr Brendan, Nevoux Marie, Ravn Malu

An Atlantic salmon (Salmo salar) mixed-stock fishery generally operating from August through October exists off the coast of Greenland and primarily harvests 1 sea-winter (1SW) North American and European origin salmon destined to return to natal waters as 2 sea-winter (2SW) spawning adults. To collect data on the biological characteristics and origin of the harvest necessary for international stock assessment efforts, parties to the North Atlant [...]

Dans le but d’expérimenter de nouveaux capteurs de température pour le suivi environnemental à l’aide de capteurs autonomes de température et la collecte et le transfert dématérialisés des données (utilisation de tablettes), des capteurs de température ont été déployés sur la côte sénégalaise. Sur les 10 sites recensés (Saint Louis, Kayar, Yoff, Hann, Mbour, Joal, Djiffer, Foundiougne, Ziguinchor et Kafountine), on a déploré la perte de 04 capteu [...]

Rapport AGD. Appui à la Gestion Durable des pélagiques

Le projet d’Appui à la Gestion Durable des petits pélagiques en Afrique de l’Ouest (AGD-pélagique) logé à la CSRP et financé par la MAVA, a pour objectif d’aider à améliorer la gestion des petits pélagiques en Afrique de l’Ouest. Pour se faire l’IRD coordonne l’harmonisation et la dématérialisation des formulaires d’enquête de pêche artisanale dans quatre pays de l’Afrique de l’Ouest (Gambie, Guinée-Bissau, Mauritanie et Sénégal) notamment par la [...]

Estimer l’importance des habitats halieutiques essentiels pour le renouvellement des populations marines exploitées

L’objectif du projet Hapomax est de contribuer à combler ces manques en développant des modèles permettant de représenter la dynamique des populations exploitées en intégrant les phases de vie sur les ZFHI (Figure 1). In fine, ces modèles doivent permettre d’estimer conjointement les impacts de pressions multiples subies localement au niveau de ces habitats côtiers et de l’exploitation par la pêche qui s’opère à une échelle beaucoup plus large, n [...]

Menet Florence, Grouhel Anne, Bizzozero Lucie

Avis de l’Ifremer concernant la demande de renouvellement de l’autorisation préfectorale de dragage d’entretien et gestion des sédiments du port du Tréport en Seine-Maritime

Presentation of the role of the structure in charge of animal welfare (SBEA) at Ifremer's Palavas marine experimental platform (PEMP).

Pichevin Laetitia e., Bollasina Massimo, Nederbragt Alexandra j., Ganeshram Raja s.

Ocean oxygen content is decreasing with global change. A major challenge for modelling future declines in oxygen concentration is our lack of knowledge of the natural variability associated with marine oxygen inventory on interannual and multidecadal timescales. Here, we present 10 annually resolved 200 year-long records of denitrification, a marker of deoxygenation, from a varved sedimentary archive in the North Pacific oxygen minimum zone cover [...]

Bernardini Ilaria, Tallec Kevin, Paul-Pont Ika, Peruzza Luca, Dalla Rovere Giulia

By 2040, tire particles (TP) are expected to dominate marine plastic contamination, raising concerns about their effects on marine animals. This study employed a multidisciplinary and multigenerational approach on the Pacific oyster Magallana gigas to investigate the effects of TP and their leachates (LEA). Effects were analysed at the individual scale, from cellular, molecular, and microbiota changes to reproductive outputs and offspring perform [...]

Trivedi Akash, Sarkar Sudipta, Ker Stephan, Minshull Timothy a, Haflidason Haflidi

Understanding the dynamic history of the marine-based paleo-Svalbard Ice Sheet  is crucial, as it provides insights into past climate change and the interactions between the  ocean system and the cryosphere. High-resolution seismic imaging is essential for  deciphering the glacial history of the western Svalbard continental margin, which has  experienced multiple glaciations throughout the Quaternary period. Glaciomarine sediments  preserved in t [...]

Grodsky Semyon a., Reul Nicolas, Vandemark Douglas

The Chukchi Sea is an open estuary in the southwestern Arctic. Its near-surface salinities are higher than those of the surrounding open Arctic waters due to the key inflow of saltier and warmer Pacific waters through the Bering Strait. This salinity distribution may suggest that interannual changes in the Bering Strait mass transport are the sole and dominant factor shaping the salinity distribution in the downstream Chukchi Sea. Using satellite [...]

Comportement des géniteurs de saumons et utilisation de l'habitat lors de leur retour en rivière

Lasne Emilien, Tremblay Julien, Forget Guillaume, Anfray Mathieu, Michelot Armand

L’arasement des barrages de Vezins (36m) en 2019 et la Roche-Qui-Boit (16m) en 2022 va permettre aux poissons migrateurs de recoloniser la partie amont du Bassin versant de la Sélune. Le suivi radio-télémétrique de 98 géniteurs de saumon atlantique (Salmo salar), essentiellement des individus de 1 hiver de mer, capturés et équipés d’émetteurs-biologgers dans l’estuaire de la Sélune en été sur la période 2019-2021, a permis de produire des données [...]