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Analyse et modélisation des évolutions à long terme de la biodiversité phytoplanctonique dans les zones côtières sous l’effet des pressions environnementales et anthropiques ArchiMer
Hernandez Farinas, Tania.
Coastal areas are highly-dynamic systems exposed to the effect of climate variations and human impacts, influencing the community diversity. In these ecosystems, the phytoplankton constitutes the base of food webs and integrates the effects of global changes and quality variations of coastal waters. In this context, the general objective of this study was to assess the long-term changes in the diversity of phytoplankton communities in coastal waters at different dcales and levels of organisation. Firstly, the data collected by the Phytoplankton and Phycotoxin Monitoring Network from the IFREMER was examined to study the temporal variations of the assemblages within the last two decades along the French coast and to assess the relationship with the...
Tipo: Text Palavras-chave: Variation temporelle; Niche ecologique; Forme de vie; Modele dynamique lineaire; Methode multi-tableaux; Temporal variation; Ecological niche; Life-forms; Dynamic linear model; Multi-table analysis.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00315/42648/42032.pdf
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Application de l’indice de composition pigmentaire ICBC pour Manche-Atlantique aux masses d’eau méditerranéennes ArchiMer
Lampert, Luis; Hernandez Farinas, Tania.
Suite aux  études concernant la mise en place d’un indice de composition pigmentaire dans les eaux de Manche-Atlantique (Lampert, 2018) et en Méditerranée (Goffart, 2018), il a été convenu de procéder à un échange de données pour ces deux façades afin d’évaluer le potentiel de ces deux indicateurs sur les façades pour lesquelles ils n’ont pas été conçus. Nous avons donc, appliqué l’indice de composition ICBC aux données obtenues entre 2009 et 2017 en Méditerranée (ICBCmed), défini une grille de classement pour l’EQR IC et finalement classé les masses d’eau afin d’inclure l’indice de composition dans l’indicateur phytoplancton de Méditerranée. Cet ICBCmed a été calculé pour les 15 points échantillonnés. Le résultat du classement est cohérent avec les...
Tipo: Text Palavras-chave: MEDITERRANEE; DCE; HPLC; PHYTOPLANCTON; INDICE DE COMPOSITION; ICBC.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00469/58111/60531.pdf
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Assessing Alternative Microscopy-Based Approaches to Species Abundance Description of Intertidal Diatom Communities ArchiMer
Ribeiro, Lourenço; Brotas, Vanda; Hernandez Farinas, Tania; Jesus, Bruno; Barille, Laurent.
Diatoms usually dominate microphytobenthic biofilms in coastal and estuarine intertidal environments. Yet, functional studies on biofilms often skip species analysis because benthic diatoms are notoriously difficult to extract from sediments and challenging to identify at that taxonomic level. Valid, less time-consuming alternatives would surely be welcomed and increase the inclusion of community structure information in microphytobenthos (MPB) ecophysiological studies. Starting with an original 181-species abundances matrix (OSM), obtained during a 2-year spatial–temporal survey in a Tagus Estuary intertidal flat with contrasting sediment textures, the current study assessed the effectiveness of several approaches to species abundances analysis. The...
Tipo: Text Palavras-chave: Diatoms; Community structure; Intertidal flats; Microphytobenthos; Multivariate analysis; Taxonomic sufficiency.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00610/72187/70963.pdf
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Assessing phytoplankton realized niches using a French National Phytoplankton Monitoring Network ArchiMer
Hernandez Farinas, Tania; Bacher, Cedric; Soudant, Dominique; Belin, Catherine; Barille, Laurent.
Relating environmental factors to species occurrence is a fundamental step in a better understanding of the community structure, the spatial and temporal dynamics of populations and how species may respond to environmental changes. In this paper, we used phytoplankton occurrence data, from a French national phytoplankton monitoring network, and environmental variables with the aim of characterizing the realized ecological niches of phytoplankton groups. We selected 35 phytoplankton taxa representing the most important taxa in terms of occurrence frequency and abundance along the French coast of the eastern English Channel, the Southern Bight of the North Sea and the Atlantic Ocean. We show that environmental variables such as nutrient concentration, water...
Tipo: Text Palavras-chave: Phytoplankton; Environment; Niche position; Tolerance; Kernel density; Outlying mean index.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00255/36627/35263.pdf
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Contribution of benthic microalgae to the temporal variation in phytoplankton assemblages in a macrotidal system ArchiMer
Hernandez Farinas, Tania; Ribeiro, Lourenco; Soudant, Dominique; Belin, Catherine; Bacher, Cedric; Lampert, Luis; Barille, Laurent.
Suspended marine benthic microalgae in the water column reflect the close relationship between the benthic and pelagic components of coastal ecosystems. In this study, a 12-year phytoplankton time-series was used to investigate the contribution of benthic microalgae to the pelagic system at a site along the French-Atlantic coast. Furthermore, all taxa identified were allocated into different growth forms in order to study their seasonal patterns. The highest contribution of benthic microalgae was observed during the winter period, reaching up to 60% of the carbon biomass in the water column. The haptobenthic growth form showed the highest contribution in terms of biomass, dominant in the fall-winter period when the turbidity and the river flow were high....
Tipo: Text Palavras-chave: Co-inertia; Dynamic linear models; Epipelon; Epiphyton; Haptobenthos; Microphytobenthos growth forms; Seasonality; Tychoplankton.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00392/50345/51035.pdf
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Définition d’un indice composition pour le phytoplancton en Manche- Atlantique, à partir des données du micro-phytoplancton du REPHY et des réseaux régionaux, et des mesures complémentaires de la flore phytoplanctonique acquises avec des techniques novatrices. Action 3 – Livrable 1. Propositions pour un indice de composition du phytoplancton, basé sur les résultats des méthodes microscopie, pigments et diversité génétique. Rapport final, février 2016 ArchiMer
Hernandez Farinas, Tania; Brun, Melanie; Siano, Raffaele; Delmas, Daniel.
This deliverable is composed of two reports which propose indice of phytoplankton composition, based respectively on the results of pigment and genetic diversity methods, and the results of microscopy method. Proposals based on the results of pigment and genetic diversity methods. The present work is a continuation of several studies carried out in the past (Siano and Delmas, 2013, 2015) on investigating an indicator of phytoplankton diversity using two methods complementary to optical microscopy: the genetic diversity analyzed with metabarcoding (exhaustive analysis of the diversity and relative abundance of OTUs, i.e. groups of sequences identified by their genetic resemblance) and the pigmentary diversity (analysis of the diversity and abundance of...
Tipo: Text Palavras-chave: Metabarcoding; OTUs; Pigments; Picophytoplancton; Indice composition; Niche ecologique; Mamiellophyceae; Chlorophylle b; Rade de Brest; Bretagne sud; Panache de la Gironde; Denombrements du micro-phytoplancton; Abondance totale; Monotonicite; Linearite; Pressions; Facade Manche-Atlantique; Metabarcoding; OTUs; Pigments; Picophytoplankton; Composition indice; Ecological niche; Mamiellophyceae; Chlorophyll b; Brest Bay; Southern Britain; Gironde plume; Micro-phytoplankton counts; Total abundance; Monotonicity; Linearity; Pressure; Channel-Atlantic coast.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47421/47426.pdf
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Détermination d’un indice de composition phytoplanctonique pigmentaire pour les eaux de la Manche et de l’Atlantique (DCE) ArchiMer
Lampert, Luis; Hernandez Farinas, Tania.
La demande de la part de la Commission Européenne, pour inclure un Indice de Compositions (IC) dans l’indicateur « phytoplancton » de la Directive Cadre de l’Eau, a été prise en compte et un test en conditions réelle a été mené sur les données pigmentaires acquises entre 2016 et 2017. Deux échantillons par mois ont été analysés par chromatographie liquide (HPLC) sur 16 points, situés de la frontière belge et jusqu’au nord de la Loire. Cet indice (ICBC) a été bâti par la comparaison des moyennes pigmentaires de chaque point à une référence, via l’indice de similarité de Bray-Curtis. Cette référence (REF-Atl) a été définie comme la moyenne des deux points les moins impactées (Querqueville et Les Hébihens). La fréquence d’échantillonnage retenue est celle de...
Tipo: Text Palavras-chave: MANCHE; ATLANTIQUE; DCE; HPLC; PHYTOPLANCTON; INDICE DE COMPOSITION; ICBC.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00469/58110/60530.pdf
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Evaluation de l’état écologique des masses d’eau de transition dans le cadre de la DCE. Etude de la pertinence du suivi des peuplements du microphytobenthos estuarien ArchiMer
Ribeiro, Lourenço; Le Bris, Anthony; Hernandez Farinas, Tania; Buchet, Remi; Dutertre, Mickaël; Metzger, Edouard; Rosa, Philippe; Gernez, Pierre; Lerouxel, Astrid; Barille, Laurent.
In order to establish the ecological status of water bodies, the European Water Framework Directive (WFD) is based on the evaluation of a number of biological quality elements, as well as physical parameters supporting the biology. In estuaries, phytoplankton monitoring was not considered relevant because of the high turbidity characterizing the large metropolitan estuaries and the French overseas departments (Guyana). In this work, we considered the possibility of using microphytobenthos (MPB) as a biological indicator of the ecological status of estuaries. This activity report summarizes the actions undertaken in 2017 under an AFB / Université de Nantes convention, which is structured around two main axes: the first axis is based on the analysis of the...
Tipo: Text Palavras-chave: DCE; Diatomées benthiques; Diversité; Estuaires; Facteurs naturels; Gradient de perturbation; Loire; Bio-indication; Microphytobenthos; Pressions anthropiques; Télédétection.; Anthropogenic pressures; Benthic diatoms; Bio-indication; Diversity; Estuary; Loire; Microphytobenthos; Natural factors; Perturbation gradient; Remote sensing; WFD.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00446/55725/57376.pdf
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Realized niche analysis of phytoplankton communities involving HAB: Phaeocystis spp. as a case study ArchiMer
Karasiewicz, Stephane; Breton, Elsa; Lefebvre, Alain; Hernandez Farinas, Tania; Lefebvre, Sebastien.
The link between harmful algal blooms, phytoplankton community dynamics and global environmental change is not well understood. To tackle this challenging question, a new method was used to reveal how phytoplankton communities responded to environmental change with the occurrence of an harmful algae, using the coastal waters of the eastern English Channel as a case study. The great interannual variability in the magnitude and intensity of Phaeocystis spp. blooms, along with diatoms, compared to the ongoing gradual decrease in anthropogenic nutrient concentration and rebalancing of nutrient ratios; suggests that other factors, such as competition for resources, may also play an important role. A realized niche approach was used with the Outlying Mean Index...
Tipo: Text Palavras-chave: Harmful algae bloom; WitOMI; Subniche; Diatoms; Biotic interaction; Eastern English Channel.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00416/52786/56650.pdf
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Surveillance écologique et halieutique du site électronucléaire de Flamanville. Année 2017 ArchiMer
Le Gac-abernot, Chantal; Antajan, Elvire; Courtay, Gaelle; Dreves, Luc; Hernandez Farinas, Tania; Lamort, Laure; Loots, Christophe; Rabiller, Emilie; Ropert, Michel; Schlaich, Ivan.
The monitoring report (n° 35) of the nuclear power plant located in Flamanville (France) takes into account studies carried out between March and September 2017. Environmental effects and potential impacts of the aquatic system are reported through different chapters: hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos. This power plant has been in operation for thirty-two years.
Tipo: Text Palavras-chave: Centrale nucléaire; Flamanville; Surveillance; Benthos; Halieutique; Pelagos; Flamanville; Monitoring; Nuclear power plant; Benthos; Fisheries; Pelagos.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00458/57008/58904.pdf
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Twenty years of satellite and in situ observations of surface chlorophyll-a from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving? ArchiMer
Gohin, Francis; Van Der Zande, Dimitry; Tilstone, Gavin; Eleveld, Marieke A.; Lefebvre, Alain; Andrieux-loyer, Francoise; Blauw, Anouk N.; Bryère, Philippe; Devreker, David; Garnesson, Philippe; Hernandez Farinas, Tania; Lamaury, Yoann; Lampert, Luis; Lavigne, Héloïse; Menet-nedelec, Florence; Pardo, Silvia; Saulquin, Bertrand.
The variability of the phytoplankton biomass derived from daily chlorophyll-a (Chl-a) satellite images was investigated over the period 1998–2017 in the surface waters of the English Channel and the northern Bay of Biscay. Merged satellite (SeaWiFS-MODIS/Aqua-MERIS-VIIRS) Chl-a was calculated using the OC5 Ifremer algorithm which is optimized for moderately-turbid waters. The seasonal cycle in satellite-derived Chl-a was compared with in situ measurements made at seven coastal stations located in the southern side of the English Channel and in the northern Bay of Biscay. The results firstly showed that the satellite Chl-a product, derived from a suite of space-borne marine reflectance data, is in agreement with the coastal observations. For compliance with...
Tipo: Text Palavras-chave: Satellite remote-sensing; Ocean colour; Phytoplankton; Chlorophyll-a; English Channel; Bay of Biscay; Eutrophication assessment; European marine strategy framework directive.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62514/66811.pdf
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Two decades of Pseudo-nitzschia spp. blooms and king scallop (Pecten maximus) contamination by domoic acid along the French Atlantic and English Channel coasts: Seasonal dynamics, spatial heterogeneity and interannual variability ArchiMer
Husson, Berengere; Hernandez Farinas, Tania; Le Gendre, Romain; Schapira, Mathilde; Chapelle, Annie.
King scallop contamination (Pecten maximus) by domoic acid, a neurotoxin produced by some species of the diatom Pseudo-nitzschia, is highly problematic because of its lengthy retention in the bivalve tissue, leading to prolonged fishery closures. Data collected within the French Phytoplankton and Phycotoxin monitoring network (REPHY) over the 1995–2012 period were used to characterize the seasonal dynamics and the interannual variability of P.-nitzschia spp. blooms as well as the contamination of king scallop fishing grounds, in six contrasted bays distributed along the French Atlantic coast and English Channel. Monitoring revealed that these toxic events have become more frequent since the year 2000, but with varying magnitudes, frequencies and timing...
Tipo: Text Palavras-chave: Pseudo-nitzschia spp.; Domoic acid; King scallop; Interannual variability; Seasonal dynamics; Environmental parameters.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00299/40983/40084.pdf
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