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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dando, C.; Walsh, D.; Ormerod, Thomas;

    Two studies explored triage decision-making in a welfare fraud investigation, specifically decisions concerning what evidence to collect when deciding whether to pursue a case to prosecution or to issue a warning only. An observational study revealed that triage decisions appear to be determined by subjective estimates of the ease of evidence collection and that these estimates are influenced by complexity of mapping evidence onto fraud types. This hypothesis was explored in an experimental study of investigators, managers, and students choosing evidence to inform triage decisions for cases that varied according to relevance and complexity. Student selections were unaffected by the nature of the case. In contrast, with a simple fraud case, investigators and managers tended to select evidence to support a prosecution decision, but with complex fraud they selected evidence that supported comparative evaluation of prosecution and warning decisions. The results demonstrate flexible expertise in choosing what evidence to sample.

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    Authors: Eva S. Horna Lowell; Julie A. Morris; Mayra C. Vidal; Catherine Durso; +1 Authors

    International audience; AbstractForaging honey bees (Apis mellifera) seem to use the presence of conspecific foragers as cues for flower quality. However, there is disagreement regarding how a conspecific cue is perceived by other foragers (enhancement or inhibition). Most studies manipulate the total number of bees foraging in an arena or the presence or absence of a bee on a flower and then observe the behavior of one forager in response to a single conspecific, which does not reflect natural foraging. We tested how a range of conspecifics on flowers affected on which flowers foraging honey bees landed. We trained students from a biology class for non-STEM majors to collect data and tested whether the number of conspecifics on flowers influences on which flower foragers land. We found that foragers land more frequently on flowers occupied by more conspecifics, which supports the hypothesis that conspecifics are cues for local enhancement. Our results increase our understanding of how honey bees forage once at a flower patch.

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    Apidologie
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    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Apidologie
    Article . 2019 . Peer-reviewed
    License: Springer TDM
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      Apidologie
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Apidologie
      Article . 2019 . Peer-reviewed
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    Authors: Polyakov, Igor; Walsh, David; Dmitrenko, Igor; Colony, Roger L.; +1 Authors

    This study has been motivated by reports of extraordinary change in the Arctic Ocean observed in recent decades. Most of these observations are based on synoptic measurements, while evaluation of anomalies requires an understanding of the underlying long‐term variability. Historical climatologies give reference means, and while these datasets are a reliable source of the mean Atlantic Layer temperature, they significantly underestimate variability. Using historical data, we calculated statistical parameters for selected Arctic Ocean regions. They demonstrate a high level of Atlantic Layer temperature variability in the Nansen Basin and sea‐surface salinity fluctuations on the Siberian shelf and the Amundsen Basin. These estimates suggest strong limitations on our ability to define amplitudes of anomalies by comparing recent synoptic measurements with climatologies, especially for regions characterized by strong variability.

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    Geophysical Research Letters
    Article . 2003 . Peer-reviewed
    License: Wiley Online Library User Agreement
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      Geophysical Research Letters
      Article . 2003 . Peer-reviewed
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    Authors: Mengqi Wang; Qichao Tu; Qichao Tu; Qichao Tu; +1 Authors

    Microorganisms do not exist as individual population in the environment. Rather, they form complex assemblages that perform essential ecosystem functions and maintain ecosystem stability. Besides the diversity and composition of microbial communities, deciphering their potential interactions in the form of association networks has attracted many microbiologists and ecologists. Much effort has been made toward the methodological development for constructing microbial association networks. However, microbial profiles suffer dramatically from zero values, which hamper accurate association network construction. In this study, we investigated the effects of zero-value issues associated with microbial association network construction. Using the TARA Oceans microbial profile as an example, different zero-value-treatment approaches were comparatively investigated using different correlation methods. The results suggested dramatic variations of correlation coefficient values for differently treated microbial profiles. Most specifically, correlation coefficients among less frequent microbial taxa were more affected, whichever method was used. Negative correlation coefficients were more problematic and sensitive to network construction, as many of them were inferred from low-overlapped microbial taxa. Consequently, microbial association networks were greatly differed. Among various approaches, we recommend sequential calculation of correlation coefficients for microbial taxa pairs by excluding paired zero values. Filling missing values with pseudo-values is not recommended. As microbial association network analyses have become a widely used technique in the field of microbial ecology and environmental science, we urge cautions be made to critically consider the zero-value issues in microbial data.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Microbi...arrow_drop_down
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    Frontiers in Microbiology
    Article . 2022
    Data sources: DOAJ
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    Frontiers in Microbiology
    Article . 2022 . Peer-reviewed
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Frontiers in Microbi...arrow_drop_down
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      Frontiers in Microbiology
      Article . 2022
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      Frontiers in Microbiology
      Article . 2022 . Peer-reviewed
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    Authors: Hissmann, Karen; Fricke, H.; Schauer, Jürgen; Ribbink, A.; +3 Authors

    Using the manned submersible Jago, the habits, distribution and number of coelacanths within all main submarine canyons of the Greater St Lucia Wetland Park were studied during 47 survey dives, with a total bottom time of 166 hours at depths ranging from 46 to 359 m, between 2002 and 2004. Twenty-four individuals were positively identified from three of the canyons, primarily from inside caves at or close to the canyon edges at depths of 96-133 m with water temperatures between 16 and 22.5oC. The population size of coelacanths within the canyons is assumed to be relatively small; coelacanths are resident but not widespread nor abundant within the park.

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    OceanRep
    Article . 2006 . Peer-reviewed
    Data sources: OceanRep
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      OceanRep
      Article . 2006 . Peer-reviewed
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    Authors: Merga, Lemessa; Redondo-Hasselerharm, P.E.; van den Brink, P.J.; Koelmans, A.A.;

    Abstract Pollution with microplastics has become an environmental concern worldwide. Yet, little information is available on the distribution of microplastics in lakes. Lake Ziway is one of the largest lakes in Ethiopia and is known for its fishing and drinking water supply. This study aims to examine the distribution of plastic particles, of all sizes (micro- and small macro-plastics) in four of the major fish species of the lake and in its shoreline sediment. The gastrointestinal tracts analysis showed that 35% of the sampled fishes ingested plastic particles. The median number of particles per fish was 4 (range 1–26). Benthic (Clarias gariepinus) and benthopelagic (Cyprinus carpio and Carassius carassius) fish species were found to contain a significantly higher number of plastic particles in comparison to the planktivorous fish species (Oreochromis niloticus). More fishes ingested plastic particles in the wet compared to the dry season. The maximum plastic size (40 mm fibre) was found in C. carpio. Estimated median mass of plastic particles in fish was 0.07 (0.0002–385.2) mg/kg_ww. Fish and sediment samples close to known potential sources of plastic particles had a higher plastic ingestion frequency (52% of the fish) and higher plastic concentration compared to the other parts of the lake. The median count and mass of plastic particles measured in sediment of the lake were 30,000 (400–124,000) particles/m3 and 764 (0.05–36,233) mg/kg_dw, respectively, the upper limits of which exceed known effect thresholds. Attenuated total reflection (ATR) - Fourier-transform infrared (FTIR) spectroscopy showed that polypropylene, polyethylene and alkyd-varnish were the dominant polymers in fishes and in sediment. The plastic particles size distributions were Log-linear and were identical for plastic particles found in fish and in sediment, suggesting strong benthic-pelagic coupling of plastic particles transfer.

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    NARCIS; Research@WUR
    Article . 2020
    License: CC BY
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    The Science of The Total Environment
    Article . 2020 . Peer-reviewed
    License: CC BY
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      Article . 2020
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      The Science of The Total Environment
      Article . 2020 . Peer-reviewed
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    Authors: Shasha Wang; Florian Weinberger; Mark Lenz;

    Marine macroalgae in temperate regions are constantly exposed to colonization by fouling organisms, but the intensity of fouling fluctuates in time. We, therefore, hypothesized that a macroalgal species from these latitudes should be able to adjust its antifouling defense to the prevailing colonization pressure. To test this assumption, fouling pressure in the Western Baltic Sea as well as the activity of surface extracts gained from the non-native Gracilaria vermiculophylla against the diatom Stauroneis constricta and the filamentous alga Ceramium tenuicorne were assessed over one vegetation period on a monthly basis. We used two solvents with different polarities to extract chemical compounds from the alga. Both, hexane and dichloromethane (DCM) surface extracts, inhibited settlement of C. tenuicorne, while only hexane surface extracts deterred S. constricta. Furthermore, the activities of both extracts fluctuated on the scale of months and the fluctuations in the activity against C. tenuicorne, which were observed in DCM extracts, correlated with the intensity of fouling pressure that C. tenuicorne inflicted on G. vermiculophylla in the field. Thus, G. vermiculophylla appears to be able to adjust its antifouling defenses—at least partly—to fouling pressure.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Marine Biologyarrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Marine Biology
    Article . 2018 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Marine Biology
      Article . 2018 . Peer-reviewed
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    Authors: Jeffrey A. Hawkes; Pamela E. Rossel; Aron Stubbins; David A. Butterfield; +7 Authors

    Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood1, 2. Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212–401 °C. In laboratory experiments, where we heated samples to 380 °C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years3.

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    Authors: Ifremer, ODE/VIGIES;

    Les Journées du Réseau d'Observation et de Surveillance du Phytoplancton et des Phycotoxines (REPHY-REPHYTOX) mis en oeuvre par l’Ifremer sont un moment privilégié pour échanger et améliorer nos connaissances sur les domaines qui ont trait à l’observation du phytoplancton, au contexte hydrologique et à la thématique des phycotoxines. Ouvertes à toute personne intéressée par ces thématiques, les 2 journées ont rassemblé près de 145 participants, des scientifiques, biologistes, chimistes, économistes, des gestionnaires, des opérateurs de terrain, des professionnels, issus de structures variées, notamment de centres techniques, bureaux d’études, représentants des professionnels de la conchyliculture et de la pêche, Directions Départementales Interministérielles, Collectivités locales, Laboratoire Départementaux, entreprises innovantes, Université de Nantes (ISOMer), représentants de la DGAL, de l’ANSES, et les services et laboratoires Ifremer tels que le service Valorisation de l'Information pour la Gestion Intégrée Et la Surveillance (VIGIES), l’unité Physiologie et toxines des microalgues toxiques et nuisibles (Phytox), les laboratoires Ecologie pélagique (DYNECO-PELAGOS), Détection, Capteurs et Mesures (DCM), et les Laboratoires Environnement Ressources (LER) de l’Unité Littoral. Une vingtaine d’exposés ont été présentés, sur des sujets très variés. La première journée était consacrée au REPHY, avec l’observation et la surveillance du phytoplancton et de l’hydrologie dans les eaux littorales, et la seconde aux réseaux REPHY et REPHYTOX, avec la surveillance des phycotoxines dans les organismes marins (notamment les coquillages destinés à la consommation humaine) et des microalgues toxiques ou nuisibles. Ces journées 2022 ont à nouveau démontré la forte interactivité et le dynamisme du réseau existant autour du suivi du phytoplancton. Le présent rapport est la compilation des diaporamas présentés durant ces journées (Partie 2), et des résumés associés (Partie 1). Seule une présentation n’y apparait pas, car certains travaux qui y sont présentés, toujours en cours, vont faire l’objet d’une publication.

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    Authors: Dando, C.; Walsh, D.; Ormerod, Thomas;

    Two studies explored triage decision-making in a welfare fraud investigation, specifically decisions concerning what evidence to collect when deciding whether to pursue a case to prosecution or to issue a warning only. An observational study revealed that triage decisions appear to be determined by subjective estimates of the ease of evidence collection and that these estimates are influenced by complexity of mapping evidence onto fraud types. This hypothesis was explored in an experimental study of investigators, managers, and students choosing evidence to inform triage decisions for cases that varied according to relevance and complexity. Student selections were unaffected by the nature of the case. In contrast, with a simple fraud case, investigators and managers tended to select evidence to support a prosecution decision, but with complex fraud they selected evidence that supported comparative evaluation of prosecution and warning decisions. The results demonstrate flexible expertise in choosing what evidence to sample.

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    Authors: Eva S. Horna Lowell; Julie A. Morris; Mayra C. Vidal; Catherine Durso; +1 Authors

    International audience; AbstractForaging honey bees (Apis mellifera) seem to use the presence of conspecific foragers as cues for flower quality. However, there is disagreement regarding how a conspecific cue is perceived by other foragers (enhancement or inhibition). Most studies manipulate the total number of bees foraging in an arena or the presence or absence of a bee on a flower and then observe the behavior of one forager in response to a single conspecific, which does not reflect natural foraging. We tested how a range of conspecifics on flowers affected on which flowers foraging honey bees landed. We trained students from a biology class for non-STEM majors to collect data and tested whether the number of conspecifics on flowers influences on which flower foragers land. We found that foragers land more frequently on flowers occupied by more conspecifics, which supports the hypothesis that conspecifics are cues for local enhancement. Our results increase our understanding of how honey bees forage once at a flower patch.

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    Apidologie
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    Apidologie
    Article . 2019 . Peer-reviewed
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      Apidologie
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    Authors: Polyakov, Igor; Walsh, David; Dmitrenko, Igor; Colony, Roger L.; +1 Authors

    This study has been motivated by reports of extraordinary change in the Arctic Ocean observed in recent decades. Most of these observations are based on synoptic measurements, while evaluation of anomalies requires an understanding of the underlying long‐term variability. Historical climatologies give reference means, and while these datasets are a reliable source of the mean Atlantic Layer temperature, they significantly underestimate variability. Using historical data, we calculated statistical parameters for selected Arctic Ocean regions. They demonstrate a high level of Atlantic Layer temperature variability in the Nansen Basin and sea‐surface salinity fluctuations on the Siberian shelf and the Amundsen Basin. These estimates suggest strong limitations on our ability to define amplitudes of anomalies by comparing recent synoptic measurements with climatologies, especially for regions characterized by strong variability.

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    Geophysical Research Letters
    Article . 2003 . Peer-reviewed
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      Geophysical Research Letters
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    Authors: Mengqi Wang; Qichao Tu; Qichao Tu; Qichao Tu; +1 Authors

    Microorganisms do not exist as individual population in the environment. Rather, they form complex assemblages that perform essential ecosystem functions and maintain ecosystem stability. Besides the diversity and composition of microbial communities, deciphering their potential interactions in the form of association networks has attracted many microbiologists and ecologists. Much effort has been made toward the methodological development for constructing microbial association networks. However, microbial profiles suffer dramatically from zero values, which hamper accurate association network construction. In this study, we investigated the effects of zero-value issues associated with microbial association network construction. Using the TARA Oceans microbial profile as an example, different zero-value-treatment approaches were comparatively investigated using different correlation methods. The results suggested dramatic variations of correlation coefficient values for differently treated microbial profiles. Most specifically, correlation coefficients among less frequent microbial taxa were more affected, whichever method was used. Negative correlation coefficients were more problematic and sensitive to network construction, as many of them were inferred from low-overlapped microbial taxa. Consequently, microbial association networks were greatly differed. Among various approaches, we recommend sequential calculation of correlation coefficients for microbial taxa pairs by excluding paired zero values. Filling missing values with pseudo-values is not recommended. As microbial association network analyses have become a widely used technique in the field of microbial ecology and environmental science, we urge cautions be made to critically consider the zero-value issues in microbial data.

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    Frontiers in Microbiology
    Article . 2022
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    Frontiers in Microbiology
    Article . 2022 . Peer-reviewed
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      Frontiers in Microbiology
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    Authors: Hissmann, Karen; Fricke, H.; Schauer, Jürgen; Ribbink, A.; +3 Authors

    Using the manned submersible Jago, the habits, distribution and number of coelacanths within all main submarine canyons of the Greater St Lucia Wetland Park were studied during 47 survey dives, with a total bottom time of 166 hours at depths ranging from 46 to 359 m, between 2002 and 2004. Twenty-four individuals were positively identified from three of the canyons, primarily from inside caves at or close to the canyon edges at depths of 96-133 m with water temperatures between 16 and 22.5oC. The population size of coelacanths within the canyons is assumed to be relatively small; coelacanths are resident but not widespread nor abundant within the park.

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    OceanRep
    Article . 2006 . Peer-reviewed
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      OceanRep
      Article . 2006 . Peer-reviewed
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    Authors: Merga, Lemessa; Redondo-Hasselerharm, P.E.; van den Brink, P.J.; Koelmans, A.A.;

    Abstract Pollution with microplastics has become an environmental concern worldwide. Yet, little information is available on the distribution of microplastics in lakes. Lake Ziway is one of the largest lakes in Ethiopia and is known for its fishing and drinking water supply. This study aims to examine the distribution of plastic particles, of all sizes (micro- and small macro-plastics) in four of the major fish species of the lake and in its shoreline sediment. The gastrointestinal tracts analysis showed that 35% of the sampled fishes ingested plastic particles. The median number of particles per fish was 4 (range 1–26). Benthic (Clarias gariepinus) and benthopelagic (Cyprinus carpio and Carassius carassius) fish species were found to contain a significantly higher number of plastic particles in comparison to the planktivorous fish species (Oreochromis niloticus). More fishes ingested plastic particles in the wet compared to the dry season. The maximum plastic size (40 mm fibre) was found in C. carpio. Estimated median mass of plastic particles in fish was 0.07 (0.0002–385.2) mg/kg_ww. Fish and sediment samples close to known potential sources of plastic particles had a higher plastic ingestion frequency (52% of the fish) and higher plastic concentration compared to the other parts of the lake. The median count and mass of plastic particles measured in sediment of the lake were 30,000 (400–124,000) particles/m3 and 764 (0.05–36,233) mg/kg_dw, respectively, the upper limits of which exceed known effect thresholds. Attenuated total reflection (ATR) - Fourier-transform infrared (FTIR) spectroscopy showed that polypropylene, polyethylene and alkyd-varnish were the dominant polymers in fishes and in sediment. The plastic particles size distributions were Log-linear and were identical for plastic particles found in fish and in sediment, suggesting strong benthic-pelagic coupling of plastic particles transfer.

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    NARCIS; Research@WUR
    Article . 2020
    License: CC BY
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    The Science of The Total Environment
    Article . 2020 . Peer-reviewed
    License: CC BY
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      Article . 2020
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      The Science of The Total Environment
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    Authors: Shasha Wang; Florian Weinberger; Mark Lenz;

    Marine macroalgae in temperate regions are constantly exposed to colonization by fouling organisms, but the intensity of fouling fluctuates in time. We, therefore, hypothesized that a macroalgal species from these latitudes should be able to adjust its antifouling defense to the prevailing colonization pressure. To test this assumption, fouling pressure in the Western Baltic Sea as well as the activity of surface extracts gained from the non-native Gracilaria vermiculophylla against the diatom Stauroneis constricta and the filamentous alga Ceramium tenuicorne were assessed over one vegetation period on a monthly basis. We used two solvents with different polarities to extract chemical compounds from the alga. Both, hexane and dichloromethane (DCM) surface extracts, inhibited settlement of C. tenuicorne, while only hexane surface extracts deterred S. constricta. Furthermore, the activities of both extracts fluctuated on the scale of months and the fluctuations in the activity against C. tenuicorne, which were observed in DCM extracts, correlated with the intensity of fouling pressure that C. tenuicorne inflicted on G. vermiculophylla in the field. Thus, G. vermiculophylla appears to be able to adjust its antifouling defenses—at least partly—to fouling pressure.

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    Marine Biology
    Article . 2018 . Peer-reviewed
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      Marine Biology
      Article . 2018 . Peer-reviewed
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    Authors: Jeffrey A. Hawkes; Pamela E. Rossel; Aron Stubbins; David A. Butterfield; +7 Authors

    Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood1, 2. Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212–401 °C. In laboratory experiments, where we heated samples to 380 °C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years3.

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    Authors: Ifremer, ODE/VIGIES;

    Les Journées du Réseau d'Observation et de Surveillance du Phytoplancton et des Phycotoxines (REPHY-REPHYTOX) mis en oeuvre par l’Ifremer sont un moment privilégié pour échanger et améliorer nos connaissances sur les domaines qui ont trait à l’observation du phytoplancton, au contexte hydrologique et à la thématique des phycotoxines. Ouvertes à toute personne intéressée par ces thématiques, les 2 journées ont rassemblé près de 145 participants, des scientifiques, biologistes, chimistes, économistes, des gestionnaires, des opérateurs de terrain, des professionnels, issus de structures variées, notamment de centres techniques, bureaux d’études, représentants des professionnels de la conchyliculture et de la pêche, Directions Départementales Interministérielles, Collectivités locales, Laboratoire Départementaux, entreprises innovantes, Université de Nantes (ISOMer), représentants de la DGAL, de l’ANSES, et les services et laboratoires Ifremer tels que le service Valorisation de l'Information pour la Gestion Intégrée Et la Surveillance (VIGIES), l’unité Physiologie et toxines des microalgues toxiques et nuisibles (Phytox), les laboratoires Ecologie pélagique (DYNECO-PELAGOS), Détection, Capteurs et Mesures (DCM), et les Laboratoires Environnement Ressources (LER) de l’Unité Littoral. Une vingtaine d’exposés ont été présentés, sur des sujets très variés. La première journée était consacrée au REPHY, avec l’observation et la surveillance du phytoplancton et de l’hydrologie dans les eaux littorales, et la seconde aux réseaux REPHY et REPHYTOX, avec la surveillance des phycotoxines dans les organismes marins (notamment les coquillages destinés à la consommation humaine) et des microalgues toxiques ou nuisibles. Ces journées 2022 ont à nouveau démontré la forte interactivité et le dynamisme du réseau existant autour du suivi du phytoplancton. Le présent rapport est la compilation des diaporamas présentés durant ces journées (Partie 2), et des résumés associés (Partie 1). Seule une présentation n’y apparait pas, car certains travaux qui y sont présentés, toujours en cours, vont faire l’objet d’une publication.

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ ArchiMer - Instituti...arrow_drop_down
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