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Chiantore M, Asnaghi V, Saab MAA, Acaf L, Accoroni S, Badreddine A, Escalera L, Fricke A, Jauzein C, Lemée R, Totti C, Turki S, Vila M, Zaghmourii I, Zingone A, Berdalet E, Mangialajo L. Basin scale variability of Ostreopsis spp. blooms provides evidence of effectiveness of an integrated sampling approach. HARMFUL ALGAE 2024; 136:102651. [PMID: 38876529 DOI: 10.1016/j.hal.2024.102651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 05/02/2024] [Accepted: 05/19/2024] [Indexed: 06/16/2024]
Abstract
Ostreopsis spp. blooms have been occurring in the last two decades in the Mediterranean Sea in association with a variety of biotic and abiotic substrata (macroalgae, seagrasses, benthic invertebrates, sand, pebbles and rocks). Cells proliferate attached to the surfaces through mucilaginous trichocysts, which lump together microalgal cells, and can also be found in the plankton and on floating aggregates: such tychoplanktonic behavior makes the quantitative assessment of blooms more difficult than planktonic or benthic ones. Different techniques have been so far applied for quantifying cell abundances of benthic microalgae for research, monitoring and risk assessment purposes. In this context, the Benthic Dinoflagellates Integrator (BEDI), a non-destructive quantification method for benthic dinoflagellate abundances, was developed and tested within the EU ENPI-CBCMED project M3-HABs. This device allows mechanical detachment of cells without collecting the benthic substrate, providing an integrated assessment of both epiphytic and planktonic cells, i.e. of the number of cells potentially made available in the water volume from "resuspension" which could have harmful effects on other organisms (including humans). The present study confirms the effectiveness of the BEDI sampling device across different environments across the Mediterranean Sea and constitutes the first large-scale study of Ostreopsis spp. blooms magnitude in function of different macro- and meso‑habitat features across the basin.
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Affiliation(s)
- Mariachiara Chiantore
- DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy; CoNISMa, Piazzale Flaminio 9, 00196 Rome, Italy; National Biodiversity Future Center, 90133 Palermo, Italy
| | - Valentina Asnaghi
- DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy; CoNISMa, Piazzale Flaminio 9, 00196 Rome, Italy; National Biodiversity Future Center, 90133 Palermo, Italy.
| | - Marie Abboud-Abi Saab
- National Council for Scientific Research, National Centre for Marine Sciences, P.O. Box 534, Batroun, Lebanon
| | - Laury Acaf
- National Council for Scientific Research, National Centre for Marine Sciences, P.O. Box 534, Batroun, Lebanon; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 06234 Villefranche-sur-mer, France
| | - Stefano Accoroni
- CoNISMa, Piazzale Flaminio 9, 00196 Rome, Italy; Department of Life and Environmental Sciences, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy
| | - Ali Badreddine
- National Council for Scientific Research, National Centre for Marine Sciences, P.O. Box 534, Batroun, Lebanon
| | - Laura Escalera
- Stazione Zoologica Anton Dohrn, Napoli, Italy; Subida a Radiofaro 50, 36390 Vigo (Pontevedra, Spain), Centro Oceanografico de Vigo (IEO-CSIC), Spain
| | - Anna Fricke
- Université Côte d'Azur, CNRS, ECOMERS, Parc Valrose 28, Avenue Valrose, 06108 Nice, France; IGZ - Leibniz Institute of Vegetable and Ornamental Crops, e.V. Theodor-Echtermeyer-Weg 1, 14979 Großbeeren, Germany
| | - Cécile Jauzein
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 06234 Villefranche-sur-mer, France; Laboratoire d'Ecologie Pélagique (PDG-ODE-DYNECO-PELAGOS) Centre Bretagne - ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané, France
| | - Rodolphe Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, 06234 Villefranche-sur-mer, France
| | - Cecilia Totti
- CoNISMa, Piazzale Flaminio 9, 00196 Rome, Italy; Department of Life and Environmental Sciences, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy
| | - Souad Turki
- National Institute of Marine Sciences and Technologies, 28 rue 2 mars 1934, Carthage Salammbô, Tunisia
| | - Magda Vila
- Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Catalonia, Spain
| | - Imen Zaghmourii
- National Institute of Marine Sciences and Technologies, 28 rue 2 mars 1934, Carthage Salammbô, Tunisia
| | | | - Elisa Berdalet
- Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Catalonia, Spain
| | - Luisa Mangialajo
- Université Côte d'Azur, CNRS, ECOMERS, Parc Valrose 28, Avenue Valrose, 06108 Nice, France
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2
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Monserrat M, Asnaghi V, Verdura J, Meroni L, Lemée R, Rossi AM, Romero G, Priouzeau F, Chiantore M, Mangialajo L. From micro to mesoscale: Understanding the influence of macroalgal communities on Ostreopsis Schmidt blooms. HARMFUL ALGAE 2024; 136:102650. [PMID: 38876526 DOI: 10.1016/j.hal.2024.102650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 05/08/2024] [Accepted: 05/19/2024] [Indexed: 06/16/2024]
Abstract
Harmful Algal Blooms (HABs) are increasing in temperate areas, and the growth rates of benthic harmful dinoflagellates may be favoured in the context of global climate change. Benthic dinoflagellates, including species belonging to the Ostreopsis Schmidt genus, are known to develop on the surface of macroalgae and different macroalgal morphotypes and communities could host higher or lower cell abundances. The physical structure of the macroalgal substrate at the small scale (cm, microhabitat scale) and the structural complexity of the macroalgal community at the medium scale (few m, mesohabitat scale) could play a relevant role in bloom facilitation: the hypothesis that Ostreopsis species could be associated with macroalgal turfs and shrubs, structurally less complex communities than canopy-forming macroalgae, is especially under discussion and, if confirmed, could link bloom occurrence to regime shifts in temperate ecosystems. The present study, performed in two locations of the Ligurian Sea (Rochambeau, France and Vernazzola, Italy) aimed at understanding marine vegetation's role at the micro and mesohabitat scales in controlling the distribution and abundance of Ostreopsis. The abundance of the microalgal cells was quantified at different spatial scales, from cm to a few m, on different macroalgal species and communities, including artificial substrates, to tease apart the micro and mesohabitat effects. The results obtained show a high spatio-temporal variability, potentially hiding habitat-related patterns. The substrate's preferences diminish when cell abundances are very high, as in the case of Rochambeau, while in presence of moderate cell abundances as in Vernazzola or the first phases of blooms, it is possible to appreciate differences in abundances among substrates (in our study, Dictyota fasciola (Roth) Lamouroux supporting higher abundances). Our results open new research topics such as the study of blooms at a larger scale (macrohabitat) and testing different sampling methods to standardise the cells' abundances independently on the substrate.
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Affiliation(s)
- M Monserrat
- Université Côte d'Azur, CNRS, ECOSEAS, France; CoNISMa, Piazzale Flaminio 9, Roma Italy.
| | - V Asnaghi
- CoNISMa, Piazzale Flaminio 9, Roma Italy; DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy; National Biodiversity Future Center, 90133 Palermo, Italy
| | - J Verdura
- Université Côte d'Azur, CNRS, ECOSEAS, France; Departament de Biologia Marina, Institut de Ciències del Mar (CSIC), Barcelona, Spain
| | - L Meroni
- CoNISMa, Piazzale Flaminio 9, Roma Italy; DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy; National Biodiversity Future Center, 90133 Palermo, Italy
| | - R Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, France
| | - A M Rossi
- DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy
| | - G Romero
- Université Côte d'Azur, CNRS, ECOSEAS, France
| | - F Priouzeau
- Université Côte d'Azur, CNRS, ECOSEAS, France
| | - M Chiantore
- CoNISMa, Piazzale Flaminio 9, Roma Italy; DiSTAV, Università di Genova, C. so Europa 26, 16132 Genoa, Italy; National Biodiversity Future Center, 90133 Palermo, Italy
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3
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Drouet K, Lemée R, Guilloud E, Schmitt S, Laza-Martinez A, Seoane S, Boutoute M, Réveillon D, Hervé F, Siano R, Jauzein C. Ecophysiological responses of Ostreopsis towards temperature: A case study of benthic HAB facing ocean warming. HARMFUL ALGAE 2024; 135:102648. [PMID: 38830713 DOI: 10.1016/j.hal.2024.102648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 04/05/2024] [Accepted: 05/15/2024] [Indexed: 06/05/2024]
Abstract
Reports of the benthic dinoflagellate Ostreopsis spp. have been increasing in the last decades, especially in temperate areas. In a context of global warming, evidences of the effects of increasing sea temperatures on its physiology and its distribution are still lacking and need to be investigated. In this study, the influence of temperature on growth, ecophysiology and toxicity was assessed for several strains of O. cf. siamensis from the Bay of Biscay (NE Atlantic) and O. cf. ovata from NW Mediterranean Sea. Cultures were acclimated to temperatures ranging from 14.5 °C to 32 °C in order to study the whole range of each strain-specific thermal niche. Acclimation was successful for temperatures ranging from 14.5 °C to 25 °C for O. cf. siamensis and from 19 °C to 32 °C for O. cf. ovata, with the highest growth rates measured at 22 °C (0.54-1.06 d-1) and 28 °C (0.52-0.75 d-1), respectively. The analysis of cellular content of pigments and lipids revealed some aspects of thermal acclimation processes in Ostreopsis cells. Specific capacities of O. cf. siamensis to cope with stress of cold temperatures were linked with the activation of a xanthophyll cycle based on diadinoxanthin. Lipids (neutral reserve lipids and polar ones) also revealed species-specific variations, with increases in cellular content noted under extreme temperature conditions. Variations in toxicity were assessed through the Artemia franciscana bioassay. For both species, a decrease in toxicity was observed when temperature dropped under the optimal temperature for growth. No PLTX-like compounds were detected in O. cf. siamensis strains. Thus, the main part of the lethal effect observed on A. franciscana was dependent on currently unknown compounds. From a multiclonal approach, this work allowed for defining specificities in the thermal niche and acclimation strategies of O. cf. siamensis and O. cf. ovata towards temperature. Potential impacts of climate change on the toxic risk associated with Ostreopsis blooms in both NW Mediterranean Sea and NE Atlantic coast is further discussed, taking into account variations in the geographic distribution, growth abilities and toxicity of each species.
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Affiliation(s)
- K Drouet
- Sorbonne Université, CNRS - Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, 06230, France; Ifremer, DYNECO/Pelagos, F-29280, Plouzané, France.
| | - R Lemée
- Sorbonne Université, CNRS - Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, 06230, France
| | - E Guilloud
- Ifremer, DYNECO/Pelagos, F-29280, Plouzané, France
| | - S Schmitt
- Ifremer, DYNECO/Pelagos, F-29280, Plouzané, France
| | - A Laza-Martinez
- Department of Plant Biology and Ecology, University of the Basque Country UPV/EHU, Leioa, 48940, Spain; Research Centre for Experimental Marine Biology and Biotechnology (Plentzia Marine Station, PiE- UPV/EHU), Plentzia, 48620, Spain
| | - S Seoane
- Department of Plant Biology and Ecology, University of the Basque Country UPV/EHU, Leioa, 48940, Spain; Research Centre for Experimental Marine Biology and Biotechnology (Plentzia Marine Station, PiE- UPV/EHU), Plentzia, 48620, Spain
| | - M Boutoute
- Sorbonne Université, CNRS - Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, 06230, France
| | - D Réveillon
- Ifremer, PHYTOX, Laboratoire METALG, F-44000, Nantes, France
| | - F Hervé
- Ifremer, PHYTOX, Laboratoire METALG, F-44000, Nantes, France
| | - R Siano
- Ifremer, DYNECO/Pelagos, F-29280, Plouzané, France
| | - C Jauzein
- Ifremer, DYNECO/Pelagos, F-29280, Plouzané, France
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Ibghi M, Rijal Leblad B, L’Bachir El Kbiach M, Aboualaalaa H, Daoudi M, Masseret E, Le Floc’h E, Hervé F, Bilien G, Chomerat N, Amzil Z, Laabir M. Molecular Phylogeny, Morphology, Growth and Toxicity of Three Benthic Dinoflagellates Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis Developing in Strait of Gibraltar, Southwestern Mediterranean. Toxins (Basel) 2024; 16:49. [PMID: 38251265 PMCID: PMC10819257 DOI: 10.3390/toxins16010049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/23/2024] Open
Abstract
Few works have been carried out on benthic harmful algal blooms (BHAB) species in the southern Mediterranean and no data are available for the highly dynamic Strait of Gibraltar (western Mediterranean waters). For the first time, Ostreopsis sp. 9, Prorocentrum lima and Coolia monotis were isolated in this key region in terms of exchanges between the Atlantic Ocean and the Mediterranean and subject to intense maritime traffic. Ribotyping confirmed the morphological identification of these three dinoflagellates species. Monoclonal cultures were established and the maximum growth rate and cell yield were measured at a temperature of 24 °C and an irradiance of 90 µmol photons m-2 s-1, for each species: 0.26 ± 0.02 d-1 (8.75 × 103 cell mL-1 after 28 days) for Ostreopsis sp. 9, 0.21 ± 0.01 d-1 (49 × 103 cell mL-1 after 145 days) for P. lima and 0.21 ± 0.01 d-1 (10.02 × 103 cell mL-1 after 28 days) for C. monotis. Only P. lima was toxic with concentrations of okadaic acid and dinophysistoxin-1 measured in optimal growth conditions ranging from 6.4 pg cell-1 to 26.97 pg cell-1 and from 5.19 to 25.27 pg cell-1, respectively. The toxin content of this species varied in function of the growth phase. Temperature influenced the growth and toxin content of P. lima. Results suggest that future warming of Mediterranean coastal waters may lead to higher growth rates and to increases in cellular toxin levels in P. lima. Nitrate and ammonia affected the toxin content of P. lima but no clear trend was noted. In further studies, we have to isolate other BHAB species and strains from Strait of Gibraltar waters to obtain more insight into their diversity and toxicity.
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Affiliation(s)
- Mustapha Ibghi
- Marine Environment Monitoring Laboratory, INRH (Moroccan Institute of Fisheries Research), Tangier 90000, Morocco; (M.I.); (H.A.); (M.D.)
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Tetouan 93000, Morocco;
- MARBEC, University of Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France; (E.M.); (E.L.F.)
| | - Benlahcen Rijal Leblad
- Marine Environment Monitoring Laboratory, INRH (Moroccan Institute of Fisheries Research), Tangier 90000, Morocco; (M.I.); (H.A.); (M.D.)
| | - Mohammed L’Bachir El Kbiach
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Tetouan 93000, Morocco;
| | - Hicham Aboualaalaa
- Marine Environment Monitoring Laboratory, INRH (Moroccan Institute of Fisheries Research), Tangier 90000, Morocco; (M.I.); (H.A.); (M.D.)
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University Tetouan, Tetouan 93000, Morocco;
- MARBEC, University of Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France; (E.M.); (E.L.F.)
| | - Mouna Daoudi
- Marine Environment Monitoring Laboratory, INRH (Moroccan Institute of Fisheries Research), Tangier 90000, Morocco; (M.I.); (H.A.); (M.D.)
| | - Estelle Masseret
- MARBEC, University of Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France; (E.M.); (E.L.F.)
| | - Emilie Le Floc’h
- MARBEC, University of Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France; (E.M.); (E.L.F.)
| | - Fabienne Hervé
- Laboratoire Phycotoxines, IFREMER (French Research Institute for Exploitation of the Sea)/PHYTOX/METALG, 44311 Nantes, France; (F.H.); (Z.A.)
| | - Gwenael Bilien
- IFREMER, Unité Littoral, Station de Biologie Marine, Place de la Croix, 29185 Concarneau, France; (G.B.); (N.C.)
| | - Nicolas Chomerat
- IFREMER, Unité Littoral, Station de Biologie Marine, Place de la Croix, 29185 Concarneau, France; (G.B.); (N.C.)
| | - Zouher Amzil
- Laboratoire Phycotoxines, IFREMER (French Research Institute for Exploitation of the Sea)/PHYTOX/METALG, 44311 Nantes, France; (F.H.); (Z.A.)
| | - Mohamed Laabir
- MARBEC, University of Montpellier, CNRS, IRD, Ifremer, 34095 Montpellier, France; (E.M.); (E.L.F.)
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Phua YH, Tejeda J, Roy MC, Husnik F, Wakeman KC. Bacterial communities and toxin profiles of Ostreopsis (Dinophyceae) from the Pacific Island of Okinawa, Japan. Eur J Protistol 2023; 89:125976. [PMID: 37060793 DOI: 10.1016/j.ejop.2023.125976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 03/24/2023] [Indexed: 03/31/2023]
Abstract
Variations in toxicity of the benthic dinoflagellate Ostreopsis Schmidt 1901 have been attributed to specific molecular clades, biogeography of isolated strains, and the associated bacterial community. Here, we attempted to better understand the biodiversity and the basic biology influencing toxin production of Ostreopsis. Nine clonal cultures were established from Okinawa, Japan, and identified using phylogenetic analysis of the ITS-5.8S rRNA and 28S rRNA genes. Morphological analysis suggests that the apical pore complex L/W ratio could be a feature for differentiating Ostreopsis sp. 2 from the O. ovata species complex. We analyzed the toxicity and bacterial communities using liquid chromatography-mass spectrometry, and PCR-free metagenomic sequencing. Ovatoxin was detected in three of the seven strains of O. cf. ovata extracts, highlighting intraspecies variation in toxin production. Additionally, two new potential analogs of ovatoxin-a and ostreocin-A were identified. Commonly associated bacteria clades of Ostreopsis were identified from the established cultures. While some of these bacteria groups may be common to Ostreopsis (Rhodobacterales, Flavobacteria-Sphingobacteria, and Enterobacterales), it was not clear from our analysis if any one or more of these plays a role in toxin biosynthesis. Further examination of biosynthetic pathways in metagenomic data and additional experiments isolating specific bacteria from Ostreopsis would aid these efforts.
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Affiliation(s)
- Yong Heng Phua
- School of Science, Hokkaido University, North 10, West 8, Sapporo, Hokkaido 060-0810, Japan; Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Javier Tejeda
- Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Michael C Roy
- Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Filip Husnik
- Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495 Japan
| | - Kevin C Wakeman
- Institute for the Advancement of Higher Education, Hokkaido University, North 10, West 8, Sapporo, Hokkaido 060-0810, Japan.
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Xianbiao J, Baohong C, Kang W, Conghui P, Yahui G, Hui L. A new microalgae community — Epimicroplastic microalgae (EMP-MA). ALGAL RES 2023. [DOI: 10.1016/j.algal.2023.103059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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Álvarez EA, Klemm K, Hoppenrath M, Cembella A, John U, Karlson B. Temporal and spatial distribution of epibenthic dinoflagellates in the Kattegat-Skagerrak, NE Atlantic-Focus on Prorocentrum lima and Coolia monotis. HARMFUL ALGAE 2022; 118:102318. [PMID: 36195412 PMCID: PMC9580043 DOI: 10.1016/j.hal.2022.102318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 07/23/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
Epibenthic dinoflagellates occur globally and include many toxin-producing species of concern to human health and benthic ecosystem function. Such benthic harmful algal blooms (BHABs) have been well described from tropical and sub-tropical coastal environments, but assessments from north temperate waters, e.g., northern Europe, and polar regions are scarce. The present study addressed the biodiversity and distribution of potentially toxic epibenthic dinoflagellate populations along the west coast of Sweden (Kattegat-Skagerrak) by morphological and molecular criteria. Morphological analysis conducted by light- and electron-microscopy was then linked by DNA barcoding of the V4 region of 18S rRNA gene sequences to interpret taxonomic and phylogenetic relationships. The presence of two potentially toxigenic epibenthic dinoflagellates, Prorocentrum lima (Ehrenberg) F.Stein and Coolia monotis Meunier was confirmed, along with a description of their spatial and temporal distribution. For P. lima, one third of the cell abundance values exceeded official alarm thresholds for potentially toxic BHAB events (>1000 cells gr-1 of macroalgae fresh weight). The same species were recorded consecutively for two summers, but without significant temporal variation in cell densities. SEM analyses confirmed the presence of other benthic Prorocentrum species: P. fukuyoi complex, P. cf. foraminosum and P. cf. hoffmannianum. Analyses of the V4 region of the 18S rRNA gene also indicated the presence P. compressum, P. hoffmannianum, P. foraminosum, P. fukuyoi, and P. nanum. These findings provide the first biogeographical evidence of toxigenic benthic dinoflagellates along the west coast of Sweden, in the absence of ongoing monitoring to include epibenthic dinoflagellates. Harmful events due to the presence of Coolia at shellfish aquaculture sites along the Kattegat-Skagerrak are likely to be rather marginal because C. monotis is not known to be toxigenic. In any case, as a preliminary assessment, the results highlight the risk of diarrhetic shellfish poisoning (DSP) events caused by P. lima, which may affect the development and sustainability of shellfish aquaculture in the region.
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Affiliation(s)
- Elena Alabarces Álvarez
- Swedish Meteorological and Hydrological Institute, Research and Development, Oceanography, Sven Källfelts gata 15, 426 71 Västra Frölunda, Sweden
| | - Kerstin Klemm
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Mona Hoppenrath
- Senckenberg am Meer, Deutsches Zentrum für Marine Biodiversitätsforschung (DZMB) Südstrand 44, D-26382 Wilhelmshaven, Germany
| | - Allan Cembella
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Uwe John
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany; Helmholtz Institute for Functional Marine Biodiversity, Ammerländer Heersstraße 231, 26129 Oldenburg, Germany
| | - Bengt Karlson
- Swedish Meteorological and Hydrological Institute, Research and Development, Oceanography, Sven Källfelts gata 15, 426 71 Västra Frölunda, Sweden.
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Ibghi M, El Kbiach ML, Rijal Leblad B, Aboualaalaa H, Hervé F, Sibat M, Chair A, Masseret E, Maamour N, Daoudi M, Amzil Z, Laabir M. Occurrence of three dominant epibenthic dinoflagellates (Ostreopsis spp., Coolia monotis and Prorocentrum lima) in relation to biotic substrates and environmental factors in a highly dynamic ecosystem, the Strait of Gibraltar (Southwestern Mediterranean). ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:810. [PMID: 36129570 PMCID: PMC9490739 DOI: 10.1007/s10661-022-10426-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
No studies have been carried out on the benthic harmful algal blooms (BHABs) along the Strait of Gibraltar in the Mediterranean, and little is known about the diversity of blooming species. Here, epibenthic dinoflagellates were monitored at least biweekly over 18 months (May 2019-November 2020) in Oued Lihoud, Cap Malabata and Dalia on the thalli of five dominant macrophytes and in the water column. This is the first report on the seasonal distribution of BHAB species hosted by natural biotic substrates in the Strait of Gibraltar, which is known for high hydrodynamics, major entry of Atlantic waters and important maritime traffic. Three BHAB dinoflagellates were observed in the surveyed areas: Ostreopsis spp., Coolia monotis and Prorocentrum lima. The analysis of all data at the three sites showed that Dictyota dichotoma was the most favourable macroalgae host for these benthic dinoflagellates. The highest cell densities were observed in Cap Malabata for Ostreopsis spp. (2.7 × 105 cells/g fresh weight in September 2020), P. lima (4.57 × 104 cells/g FW in September 2020) and C. monotis (4.07 × 104 cells/g FW in June 2019). Phosphate and temperature were positively correlated to the abundances of the studied thermophilic BHAB species. In contrast, negative correlations were recorded with salinity, ammonium, nitrite, nitrate, DIN, nitrogen/phosphate ratio and suspended material, attesting of the complex relationships between environmental factors and BHAB species dynamic in each marine ecosystem. Toxin analyses of the natural phytoplankton assemblage during BHABs showed the presence of only lipophilic toxins, namely okadaic acid and dinophysistoxins produced by P. lima. These BHABs species have to be isolated to establish monoclonal cultures for ribotyping and ecophysiological investigations.
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Affiliation(s)
- Mustapha Ibghi
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University, Tetouan, Morocco
- National Institute of Fisheries Research (INRH), Tangier, Morocco
- CNRS, IRD, Ifremer, Montpellier University, MARBEC, Montpellier, France
| | | | | | - Hicham Aboualaalaa
- Equipe de Biotechnologie Végétale, Faculty of Sciences, Abdelmalek Essaadi University, Tetouan, Morocco
- National Institute of Fisheries Research (INRH), Tangier, Morocco
- CNRS, IRD, Ifremer, Montpellier University, MARBEC, Montpellier, France
| | - Fabienne Hervé
- French Institute for Research and Exploitation of the sea (IFREMER), METALG laboratory, PHYTOX, F-44000, Nantes, France
| | - Manoella Sibat
- French Institute for Research and Exploitation of the sea (IFREMER), METALG laboratory, PHYTOX, F-44000, Nantes, France
| | - Adil Chair
- National Institute of Fisheries Research (INRH), Tangier, Morocco
- Marine Geosciences and Soil Sciences Laboratory, Faculty of Sciences, Chouaïb Dokkali University, El Jadida, Morocco
| | - Estelle Masseret
- CNRS, IRD, Ifremer, Montpellier University, MARBEC, Montpellier, France
| | - Niama Maamour
- National Institute of Fisheries Research (INRH), Tangier, Morocco
| | - Mouna Daoudi
- National Institute of Fisheries Research (INRH), Tangier, Morocco
| | - Zouher Amzil
- French Institute for Research and Exploitation of the sea (IFREMER), METALG laboratory, PHYTOX, F-44000, Nantes, France
| | - Mohamed Laabir
- CNRS, IRD, Ifremer, Montpellier University, MARBEC, Montpellier, France
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9
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Wang K, Lin H, Wang S, Dong X, Sun L, Zhou Q, Chen Y, Su B, Pan Z, Chen B, Gao Y. Species diversity and community structure of microalgae living on microplastics in Luoyuan Bay, China. MARINE POLLUTION BULLETIN 2022; 180:113809. [PMID: 35688065 DOI: 10.1016/j.marpolbul.2022.113809] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
This study was carried out in Luoyuan Bay in March 2021. The species composition of microalgae community colonizing on microplastics called epimicroplastic microalgae (EMP-MA) was analyzed and compared with planktonic microalgae (PM) community. The species number of EMP-MA community (73) was higher than that of PM community (56). However Simpson Index and Pielou Evenness Index of EMP-MA community were significantly lower than that of PM community (P < 0.05). Although diatom was the most diverse and abundant taxa in both EMP-MA and PM community, their species compositions were significantly different (P < 0.05). Dominant species were also different between the two communities. Moreover, 12 harmful algal species were found in EMP-MA community, which may drift with microplastics and increase the risks of harmful algal blooms (HABs). This study is helpful to reveal the dispersal mechanism of HABs and potential impacts of EMP-MA on marine ecosystem.
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Affiliation(s)
- Kang Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China; School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Hui Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Sumin Wang
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Xu Dong
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Lin Sun
- School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Qianqian Zhou
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Yanghang Chen
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Baosi Su
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Zhong Pan
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Baohong Chen
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China.
| | - Yahui Gao
- School of Life Sciences, Xiamen University, Xiamen 361102, China.
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10
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Monserrat M, Catania D, Asnaghi V, Chiantore M, Lemée R, Mangialajo L. The role of habitat in the facilitation of Ostreopsis spp. blooms. HARMFUL ALGAE 2022; 113:102199. [PMID: 35287932 DOI: 10.1016/j.hal.2022.102199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 01/05/2022] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
In recent decades, recurrent Ostreopsis spp. blooms have been recorded throughout the globe, causing public health issues and mass mortalities of invertebrates. Ostreopsis species are benthic and develop in shallow waters in close relation with a substrate, but possible substrate preferences are still ambiguous. Bloom develops on both living and dead substrates and several interacting biotic and abiotic factors acting at different spatial scales can potentially foster or regulate Ostreopsis spp. development. The objective of this review is to collect and summarize information on Ostreopsis spp. blooms related to the habitat at different spatial scales, in order to assess preferences and trends. References including Ostreopsis spp. samplings in the field were analysed in this review, as potentially including information about the micro- (substrate), meso‑ (community) and macrohabitat (ecosystem) related to Ostreopsis spp. blooms. The sampled substrate and the ecosystem where Ostreopsis spp. were collected were generally reported and described in the studies, while the description of the mesohabitat was rarely reported. Ostreopsis spp. were generally described as attached to biotic substrates and in particular, macroalgae, even in studies conducted in coral reefs, where macroalgae are generally not dominant (but they can be in case of coral reef degradation). In both temperate and tropical areas, Ostreopsis spp. were mostly sampled on algal species usually forming medium or low complexity communities (erect or turf-forming algae), often characteristic from post-regime shift scenarios, and rarely on canopy-forming species (such as fucoids and kelps). This literature review highlights the need of collecting more information about the mesohabitat where important Ostreopsis spp. blooms develop, as much as of the underlying mechanisms driving eventual differences on Ostreopsis spp. abundances. This knowledge would allow a better risk assessment of Ostreopsis spp. blooms, identifying areas at high risk on the base of the benthic habitats.
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Affiliation(s)
- Margalida Monserrat
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-mer, France; Federative Research Institute - Marine Resources, Université Côte d'Azur, Nice, France.
| | - Daniela Catania
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-mer, France
| | | | | | - Rodolphe Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-mer, France
| | - Luisa Mangialajo
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; Federative Research Institute - Marine Resources, Université Côte d'Azur, Nice, France
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11
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Drouet K, Jauzein C, Gasparini S, Pavaux AS, Berdalet E, Marro S, Davenet-Sbirrazuoli V, Siano R, Lemée R. The benthic toxic dinoflagellate Ostreopsis cf. ovata in the NW Mediterranean Sea: Relationship between sea surface temperature and bloom phenology. HARMFUL ALGAE 2022; 112:102184. [PMID: 35144819 DOI: 10.1016/j.hal.2022.102184] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 12/24/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
Blooms of the toxic benthic dinoflagellate Ostreopsis cf. ovata can induce ecological and human health issues in certain temperate areas. In order to prevent these negative effects, long-term monitoring studies of O. cf. ovata blooms have been conducted in several impacted areas to have a comprehensive understanding of bloom dynamics and efficient tools for risk management. O. cf. ovata blooms were monitored every summer (from mid-June to the end of August) on five identified sites in Larvotto beach (Monaco, NW Mediterranean Sea), between 2007 and 2019. This time-series represents one of the largest time-series in the world describing blooms of this species. Bloom phenological features (timing, duration, maximum cell abundance and growth rate), were found to be highly variable throughout the studied period, and were analyzed as a function of different hydroclimatic parameters, including sea surface temperature (SST). The highest net growth rates were related to temperatures ranging between 21°C and 25°C, and did not coincide with maximal temperature records (27.5°C). Such results suggest that, although global warming possibly influences the expansion of O. cf. ovata from tropical to temperate waters, the definite impact of temperature on bloom dynamics might be more complex than a simple facilitation factor for algal growth, at least in NW Mediterranean waters. Furthermore, monthly SST anomalies calculated over this 13-year survey showed a strong positive correlation between spring SST positive anomalies and the bloom starting date, indicating that blooms occurred earlier in the season when spring SSTs were warmer than usual. Overall results provide tools to modelers and managers who are facing crucial challenges to predict the distribution and phenology of O. cf. ovata blooms in European coastal waters, moreover in a context of global warming.
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Affiliation(s)
- K Drouet
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, FRANCE; Ifremer, DYNECO Pelagos, F-29280 Plouzané, FRANCE.
| | - C Jauzein
- Ifremer, DYNECO Pelagos, F-29280 Plouzané, FRANCE
| | - S Gasparini
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, FRANCE
| | - A-S Pavaux
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, FRANCE
| | - E Berdalet
- Institut de Ciènces del Mar (CSIC), Barcelona, SPAIN
| | - S Marro
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, FRANCE
| | | | - R Siano
- Ifremer, DYNECO Pelagos, F-29280 Plouzané, FRANCE
| | - R Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-Mer, FRANCE
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12
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de Virgilio M, Cifarelli S, Garofoli G, Lamberti G, Massari V, Degryse B. Citizen science in the monitoring of Ostreopsis ovata blooms in southern Italy: A five-year study. MARINE POLLUTION BULLETIN 2021; 173:112981. [PMID: 34600169 DOI: 10.1016/j.marpolbul.2021.112981] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
The toxic benthic dinoflagellate Ostreopsis ovata causes harmful algal blooms. During five years, citizens have monitored blooms of O. cf. ovata along the coast of Molfetta city facing the Adriatic Sea. Coscinodiscus spp., Licmophora spp., Gyrosigma spp. and Achnantes spp. diatoms were also quantified. O. cf. ovata was detected from spring up to winter, however, blooms always occurred in summer. Correlation with nine weather parameters was relatively strong with seawater temperature, dew point and air temperature. Dew point has never been reported before as key parameter. Blooms of O. cf. ovata were preceded by lag period during which conditions permitted proliferation but no proliferation observed. Furthermore, dew point, seawater and air temperature only moderately correlated with proliferation of Coscinodiscus spp. However, correlation between blooms of O. cf. ovata and Coscinodiscus spp. was relatively strong. Correlation between proliferation of O. cf. ovata and Gyrosigma spp. was very weak, while moderate and negative with Licmophora spp. or Achnantes spp.
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Affiliation(s)
- Maddalena de Virgilio
- Osservatorio del Mare a Molfetta, Piazza Effrem, 4, Molfetta, BA, Italy; Institute of Bioscience and Bioresources - National Research Council of Italy, Via Amendola 165/A, Bari, Italy.
| | | | - Giuseppe Garofoli
- Osservatorio del Mare a Molfetta, Piazza Effrem, 4, Molfetta, BA, Italy
| | - Grazia Lamberti
- Osservatorio del Mare a Molfetta, Piazza Effrem, 4, Molfetta, BA, Italy
| | - Vincenzo Massari
- Osservatorio del Mare a Molfetta, Piazza Effrem, 4, Molfetta, BA, Italy
| | - Bernard Degryse
- Osservatorio del Mare a Molfetta, Piazza Effrem, 4, Molfetta, BA, Italy
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13
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Lounas R, Kasmi H, Chernai S, Amarni N, Hamdi B. Dynamics of the genus Ostreopsis (Gonyaulacales, Dinophyceae) in a Mediterranean fish farm. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:333. [PMID: 33970342 DOI: 10.1007/s10661-021-09117-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 05/02/2021] [Indexed: 06/12/2023]
Abstract
This study revealed the dynamics of the genus Ostreopsis in the south-western Mediterranean Sea fish farm during the 2016 and 2017 summers. This phytoplankton is known to produce palytoxin-like compounds, listed among the most potent marine toxins known, and can pose a serious concern for humans in the Mediterranean area. Principal component analysis (PCA) explained the significance of temperature, salinity, and dissolved inorganic nitrogen in the proliferation of this toxic dinoflagellate. The peak of the Ostreopsis sp. (6.34 × 103 cells L-1) was recorded at 28.4 °C, at a salinity of 38.3 PSU, and the dissolved inorganic nitrogen had a value of 0.60 μmol L-1. Our results highlight the importance of monitoring the proliferation of this harmful dinoflagellate in southern Mediterranean waters.
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Affiliation(s)
- Ryhane Lounas
- Laboratory of Conservation and Valorization of Marine Resources, National Higher School of Marine Science and Coastal Management (ENSSMAL), University Campus of Dely Ibrahim, Bois des Cars, 16320, Algiers, Algeria.
| | - Hamza Kasmi
- Sécurité de Convoyage de Fonds Et de Produits Sensibles Et/Ou Dangereux, SGS Centre, Bois des cars III Villa n°96 Dely-Ibrahim, 16320, Algiers, Algeria
| | - Safia Chernai
- Laboratory of Conservation and Valorization of Marine Resources, National Higher School of Marine Science and Coastal Management (ENSSMAL), University Campus of Dely Ibrahim, Bois des Cars, 16320, Algiers, Algeria
| | - Nadia Amarni
- Laboratory of Conservation and Valorization of Marine Resources, National Higher School of Marine Science and Coastal Management (ENSSMAL), University Campus of Dely Ibrahim, Bois des Cars, 16320, Algiers, Algeria
| | - Boualem Hamdi
- Laboratory of Conservation and Valorization of Marine Resources, National Higher School of Marine Science and Coastal Management (ENSSMAL), University Campus of Dely Ibrahim, Bois des Cars, 16320, Algiers, Algeria
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14
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Drouet K, Jauzein C, Herviot-Heath D, Hariri S, Laza-Martinez A, Lecadet C, Plus M, Seoane S, Sourisseau M, Lemée R, Siano R. Current distribution and potential expansion of the harmful benthic dinoflagellate Ostreopsis cf. siamensis towards the warming waters of the Bay of Biscay, North-East Atlantic. Environ Microbiol 2021; 23:4956-4979. [PMID: 33497010 DOI: 10.1111/1462-2920.15406] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/08/2021] [Accepted: 01/18/2021] [Indexed: 01/05/2023]
Abstract
In a future scenario of increasing temperatures in North-Atlantic waters, the risk associated with the expansion of the harmful, benthic dinoflagellate Ostreopsis cf. siamensis has to be evaluated and monitored. Microscopy observations and spatio-temporal surveys of environmental DNA (eDNA) were associated with Lagrangian particle dispersal simulations to: (i) establish the current colonization of the species in the Bay of Biscay, (ii) assess the spatial connectivity among sampling zones that explain this distribution, and (iii) identify the sentinel zones to monitor future expansion. Throughout a sampling campaign carried out in August to September 2018, microscope analysis showed that the species develops in the south-east of the bay where optimal temperatures foster blooms. Quantitative PCR analyses revealed its presence across almost the whole bay to the western English Channel. An eDNA time-series collected on plastic samplers showed that the species occurs in the bay from April to September. Due to the water circulation, colonization of the whole bay from the southern blooming zones is explained by inter-site connectivity. Key areas in the middle of the bay permit continuous dispersal connectivity towards the north. These key areas are proposed as sentinel zones to monitor O. cf. siamensis invasions towards the presumably warming water of the North-East Atlantic.
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Affiliation(s)
- Kévin Drouet
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-mer, 06230, France.,Ifremer, DYNECO, Plouzané, F-29280, France
| | | | | | | | - Aitor Laza-Martinez
- Department of Plant Biology and Ecology, University of the Basque Country UPV/EHU, Leioa, 48940, Spain.,Research Centre for Experimental Marine Biology and Biotechnology (Plentzia Marine Station, PiE- UPV/EHU), Plentzia, 48620, Spain
| | | | | | - Sergio Seoane
- Department of Plant Biology and Ecology, University of the Basque Country UPV/EHU, Leioa, 48940, Spain.,Research Centre for Experimental Marine Biology and Biotechnology (Plentzia Marine Station, PiE- UPV/EHU), Plentzia, 48620, Spain
| | | | - Rodolphe Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche (UMR 7093), Villefranche-sur-mer, 06230, France
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15
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Zou J, Li Q, Lu S, Dong Y, Chen H, Zheng C, Cui L. The first benthic harmful dinoflagellate bloom in China: Morphology and toxicology of Prorocentrum concavum. MARINE POLLUTION BULLETIN 2020; 158:111313. [PMID: 32568087 DOI: 10.1016/j.marpolbul.2020.111313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 05/19/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
More frequent events and geographic expansion of benthic harmful algal blooms have been reported in recent years. An unexpected bloom of benthic P. concavum occurred in Xincun Bay, Hainan Island, the South China Sea was monitored in August 2018. Species identification, toxin analysis and toxicity test were conducted in the study. Quantitative study revealed that P. concavum had a high cell density on the surface of substrates and in water column. The bloom forming species was identified based on the morphology and phylogeny. Toxin analysis indicated that there were no detectable DSP toxins either in algae or in shellfish samples. The result of toxicity test revealed that the extracts of P. concavum caused the mortality of brine shrimp larvae (Artemia salina). The results from this study may provide more insight into the rising threats of harmful dinoflagellate blooms to marine benthic ecosystems.
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Affiliation(s)
- Jian Zou
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
| | - Qun Li
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
| | - Songhui Lu
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China.
| | - Yuelei Dong
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
| | - Heng Chen
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
| | - Chengzhi Zheng
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
| | - Lei Cui
- Research Center of Harmful Algae and Marine Biology, Jinan University, Guangzhou 510632, China; Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China.
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Effects of substratum and depth on benthic harmful dinoflagellate assemblages. Sci Rep 2020; 10:11251. [PMID: 32647125 PMCID: PMC7347539 DOI: 10.1038/s41598-020-68136-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 06/19/2020] [Indexed: 11/14/2022] Open
Abstract
Microhabitats influence the distribution and abundance of benthic harmful dinoflagellate (BHAB) species. Currently, much of the information on the relationships between BHABs and microhabitat preferences is based on non-quantitative anecdotal observations, many of which are contradictory. The goal of this study was to better quantify BHAB and microhabitat relationships using a statistically rigorous approach. Between April 2016 to May 2017, a total of 243 artificial substrate samplers were deployed at five locations in the Perhentian Islands, Malaysia while simultaneous photo-quadrat surveys were performed to characterize the benthic substrates present at each sampling site. The screen samplers were retrieved 24 h later and the abundances of five BHAB genera, Gambierdiscus, Ostreopsis, Coolia, Amphidinium, and Prorocentrum were determined. Substrate data were then analyzed using a Bray–Curtis dissimilarity matrix to statistically identify distinct microhabitat types. Although BHABs were associated with a variety of biotic and abiotic substrates, the results of this study demonstrated differing degrees of microhabitat preference. Analysis of the survey results using canonical correspondence analysis explained 70.5% (horizontal first axis) and 21.6% (vertical second axis) of the constrained variation in the distribution of various genera among microhabitat types. Prorocentrum and Coolia appear to have the greatest range being broadly distributed among a wide variety of microhabitats. Amphidinium was always found in low abundances and was widely distributed among microhabitats dominated by hard coral, turf algae, sand and silt, and fleshy algae and reached the highest abundances there. Gambierdiscus and Ostreopsis had more restricted distributions. Gambierdiscus were found preferentially associated with turf algae, hard coral and, to a lesser extent, fleshy macroalgae microhabitats. Ostreopsis, almost always more abundant than Gambierdiscus, preferred the same microhabitats as Gambierdiscus and were found in microbial mats as well. With similar habitat preferences Ostreopsis may serve as an indicator organism for the presence of Gambierdiscus. This study provides insight into how BHAB-specific microhabitat preferences can affect toxicity risks.
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Gémin MP, Réveillon D, Hervé F, Pavaux AS, Tharaud M, Séchet V, Bertrand S, Lemée R, Amzil Z. Toxin content of Ostreopsis cf. ovata depends on bloom phases, depth and macroalgal substrate in the NW Mediterranean Sea. HARMFUL ALGAE 2020; 92:101727. [PMID: 32113596 DOI: 10.1016/j.hal.2019.101727] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 11/29/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
Over the last fifteen years, blooms of the genus Ostreopsis have been reported more frequently and at higher abundances in the Mediterranean area. Ostreopsis cf. ovata is known to produce ovatoxins (OVTXs), structural analogues of palytoxin, which is one of the most potent non-polymeric toxins. However, the production of OVTXs is poorly characterized in situ. The present study focuses on toxin content and profile according to the bloom phase during summer 2017 in Villefranche-sur-Mer, France (NW Mediterranean Sea), depth (from 0.5 to 5 m) and three different macroalgal substrates of this epiphytic dinoflagellate (Padina pavonica, Dictyota spp. and Halopteris scoparia). Ovatoxin quantification of all samples was performed by liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The bloom started at the end of June and declined in mid-July, showing the typical seasonal pattern of the NW Mediterranean Sea area. The peak was observed on the 10 July with 1.8 × 106 cells/g FW and 1.7 × 104 cells/L for benthic and planktonic cells, respectively. Total toxin content of cells, collected using artificial substrates, increased during the exponential and stationary growth phases. After reaching a maximum concentration of 9.2 pg/cell on 18 July, toxin concentration decreased and remained stable from 25 July until the end of monitoring. A decreasing trend of the abundance and of the associated total toxin content was noted with depth. Finally, the decreasing order of maximal epiphytic concentration of O. cf. ovata was: Dictyota spp. (8.3 × 105 cells/g FW), H. scoparia (3.1 × 105 cells/g FW) and P. pavonica (1.6 × 105 cells/g FW). Interestingly, the highest OVTX quota was obtained in cells present on Halopteris scoparia, then on Dictyota spp. and Padina pavonica. This suggests that the nature of the macroalgal substrate influences both growth and toxin production of O. cf. ovata and further work will be required to understand the underlying mechanisms (e.g., competition for nutrition, pH or allelopathic interaction). However, the toxin profiles (i.e., the proportion of each ovatoxin analogue) were not affected by any of the studied parameters (bloom phase, depth, macroalgae or artificial substrates).
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Affiliation(s)
| | | | - Fabienne Hervé
- IFREMER - Phycotoxins Laboratory, F- 44311 Nantes 03, France
| | - Anne-Sophie Pavaux
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, UMR 7093, BP 28, F-06230 Villefranche-sur-Mer, France
| | - Maxime Tharaud
- IFREMER - Phycotoxins Laboratory, F- 44311 Nantes 03, France
| | | | - Samuel Bertrand
- Groupe Mer, Molécules, Santé-EA 2160, UFR des Sciences Pharmaceutiques et Biologiques, Université de Nantes, Nantes-cedex 1 44035, France
| | - Rodolphe Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, UMR 7093, BP 28, F-06230 Villefranche-sur-Mer, France
| | - Zouher Amzil
- IFREMER - Phycotoxins Laboratory, F- 44311 Nantes 03, France
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Boudouresque CF, Verlaque M. Paracentrotus lividus. DEVELOPMENTS IN AQUACULTURE AND FISHERIES SCIENCE 2020. [DOI: 10.1016/b978-0-12-819570-3.00026-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Wells ML, Karlson B, Wulff A, Kudela R, Trick C, Asnaghi V, Berdalet E, Cochlan W, Davidson K, De Rijcke M, Dutkiewicz S, Hallegraeff G, Flynn KJ, Legrand C, Paerl H, Silke J, Suikkanen S, Thompson P, Trainer VL. Future HAB science: Directions and challenges in a changing climate. HARMFUL ALGAE 2020; 91:101632. [PMID: 32057342 DOI: 10.1016/j.hal.2019.101632] [Citation(s) in RCA: 135] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 06/07/2019] [Indexed: 06/10/2023]
Abstract
There is increasing concern that accelerating environmental change attributed to human-induced warming of the planet may substantially alter the patterns, distribution and intensity of Harmful Algal Blooms (HABs). Changes in temperature, ocean acidification, precipitation, nutrient stress or availability, and the physical structure of the water column all influence the productivity, composition, and global range of phytoplankton assemblages, but large uncertainty remains about how integration of these climate drivers might shape future HABs. Presented here are the collective deliberations from a symposium on HABs and climate change where the research challenges to understanding potential linkages between HABs and climate were considered, along with new research directions to better define these linkages. In addition to the likely effects of physical (temperature, salinity, stratification, light, changing storm intensity), chemical (nutrients, ocean acidification), and biological (grazer) drivers on microalgae (senso lato), symposium participants explored more broadly the subjects of cyanobacterial HABs, benthic HABs, HAB effects on fisheries, HAB modelling challenges, and the contributions that molecular approaches can bring to HAB studies. There was consensus that alongside traditional research, HAB scientists must set new courses of research and practices to deliver the conceptual and quantitative advances required to forecast future HAB trends. These different practices encompass laboratory and field studies, long-term observational programs, retrospectives, as well as the study of socioeconomic drivers and linkages with aquaculture and fisheries. In anticipation of growing HAB problems, research on potential mitigation strategies should be a priority. It is recommended that a substantial portion of HAB research among laboratories be directed collectively at a small sub-set of HAB species and questions in order to fast-track advances in our understanding. Climate-driven changes in coastal oceanographic and ecological systems are becoming substantial, in some cases exacerbated by localized human activities. That, combined with the slow pace of decreasing global carbon emissions, signals the urgency for HAB scientists to accelerate efforts across disciplines to provide society with the necessary insights regarding future HAB trends.
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Affiliation(s)
- Mark L Wells
- School of Marine Sciences, University of Maine, Orono, ME, 04469, USA; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, 36 Baochubei Road, Hangzhou, 310012, China.
| | - Bengt Karlson
- SMHI/Swedish Meteorological and Hydrological Institute, Forskning & utveckling, oceanografi/Research & development, oceanography, Sven Källfelts gata 15, 426 71 Västra Frölunda, Sweden
| | - Angela Wulff
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE405 30 Göteborg, Sweden
| | - Raphael Kudela
- Ocean Sciences Department, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA
| | - Charles Trick
- Department of Biology, Western University & Interfaculty Program in Public Health, Schulich School of Medicine and Dentistry, 1151 Richmond St. N, London, ON, N6A 5B7, Canada
| | - Valentina Asnaghi
- Università degli Studi di Genova (DiSTAV), C.so Europa 26, 16132 Genova, Italy
| | - Elisa Berdalet
- Institute of Marine Sciences (ICM-CSIC), Pg. Marítim de la Barceloneta, 37-49 08003, Barcelona, Catalonia, Spain
| | - William Cochlan
- Estuary & Ocean Science Center, Romberg Tiburon Campus, San Francisco State University, 3150 Paradise Drive, Tiburon, CA, 94920-1205, USA
| | - Keith Davidson
- Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll, PA37 1QA, Scotland, UK
| | - Maarten De Rijcke
- Flanders Marine Institute (VLIZ), InnovOcean site, Wandelaarkaai 7, 8400 Ostend, Belgium
| | - Stephanie Dutkiewicz
- Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Gustaaf Hallegraeff
- Institute for Marine and Antarctic Studies, University of Tasmania Private Bag 129 Hobart, TAS 7001, Australia
| | - Kevin J Flynn
- Department of Biosciences, Singleton Campus, Swansea University, Swansea, SA2 8PP, Wales, UK
| | - Catherine Legrand
- Linnaeus University, Centre for Ecology and Evolution in Microbial Model Systems, Faculty of Health and Life Sciences, SE-39182, Kalmar, Sweden
| | - Hans Paerl
- Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, NC, 28557, USA
| | - Joe Silke
- Marine Institute, Renville, Oranmore, Co. Galway, H91 R673, Ireland
| | - Sanna Suikkanen
- Finnish Environment Institute, Marine Research Centre, Latokartanonkaari 11, FI-00790 Helsinki, Finland
| | - Peter Thompson
- Marine and Atmospheric Science, CSIRO, Castray Esplanade, Hobart, TAS 7000, Australia
| | - Vera L Trainer
- Environment and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd. E., Seattle, WA 98112, USA
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Ben Gharbia H, Laabir M, Ben Mhamed A, Gueroun SKM, Daly Yahia MN, Nouri H, M'Rabet C, Shili A, Kéfi-Daly Yahia O. Occurrence of epibenthic dinoflagellates in relation to biotic substrates and to environmental factors in Southern Mediterranean (Bizerte Bay and Lagoon, Tunisia): An emphasis on the harmful Ostreopsis spp., Prorocentrum lima and Coolia monotis. HARMFUL ALGAE 2019; 90:101704. [PMID: 31806162 DOI: 10.1016/j.hal.2019.101704] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 10/28/2019] [Accepted: 10/29/2019] [Indexed: 06/10/2023]
Abstract
Harmful events associated with epibenthic dinoflagellates, have been reported more frequently over the last decades. Occurrence of potentially toxic benthic dinoflagellates, on the leaves of two magnoliophytes (Cymodocea nodosa and Zostera noltei) and thalli of the macroalgae (Ulva rigida), was monitored over one year (From May 2015 to April 2016) in the Bizerte Bay and Lagoon (North of Tunisia, Southern Mediterranean Sea). The investigated lagoon is known to be highly anthropized. This is the first report on the seasonal distribution of epibenthic dinoflagellates hosted by natural substrates, from two contrasted, adjacent coastal Mediterranean ecosystems. The environmental factors promoting the development of the harmful epibenthic dinoflagellates Ostreopsis spp., Prorocentrum lima and Coolia monotis were investigated. The highest cell densities were reached by Ostreopsis spp. (1.9 × 103 cells g-1 FW, in October 2015), P. lima (1.6 × 103 cells g-1 FW, in June 2015) and C. monotis (1.1 × 103 cells g-1 FW, in May 2015). C. nodosa and Z. noltei were the most favorable host macrophytes for C. monotis (in station L2) and Ostreopsis spp. (in station L3), respectively. Positive correlations were recorded between Ostreopsis spp. and temperature. Densities of the epibenthic dinoflagellates varied according to the collection site, and a great disparity was observed between the Bay and the Lagoon. Maximum concentrations were recorded on C. nodosa leaves from the Bizerte Bay, while low epiphytic cell abundances were associated with macrophytes sampled from the Bizerte Lagoon. The observed differences in dinoflagellate abundances between the two ecosystems (Bay-Lagoon) seemed not related to the nutrients, but rather to the poor environmental conditions in the lagoon.
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Affiliation(s)
- Hela Ben Gharbia
- Research Group on Oceanography and Plankton Ecology, Tunisian National Institute of Agronomy (INAT), 43 Avenue Charles Nicolle, IRESA- Carthage University, LR18ES41 (Tunis El Manar University), Tunis, 1082, Tunisia.
| | - Mohamed Laabir
- Center for Marine Biodiversity, Exploitation and Conservation (MARBEC), Institut de Recherche pour le Développement (IRD), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre National de la Recherche Scientifique (CNRS), Montpellier University, Place Eugène Bataillon, CC093, Montpellier, Cedex 5, F-34095, France
| | - Abdelouahed Ben Mhamed
- National Institute for Fisheries Research, Central laboratories, Bd Sidi Abderrahmane Ain Diab 2, Casablanca, Morocco
| | - Sonia Khadija Maïté Gueroun
- Faculty of Sciences of Bizerte, Laboratory of Aquatic Systems Biodiversity and Functioning, 7021 Zarzouna, Carthage University, Bizerte, Tunisia
| | - Mohamed Néjib Daly Yahia
- Department of Biological and Environmental Sciences, College of Arts and Sciences, Qatar University, PO Box 2713, Doha, Qatar
| | - Habiba Nouri
- Institut de Recherche pour le Développement (IRD), 2 Rue Des Sports-El Menzah 1, BP 434, Tunis, 1004, Tunisia
| | - Charaf M'Rabet
- Research Group on Oceanography and Plankton Ecology, Tunisian National Institute of Agronomy (INAT), 43 Avenue Charles Nicolle, IRESA- Carthage University, LR18ES41 (Tunis El Manar University), Tunis, 1082, Tunisia
| | - Abdessalem Shili
- Tunisian National Institute of Agronomy (INAT), 43 Avenue Charles Nicolle, IRESA-Carthage University, Tunis, 1082, Tunisia
| | - Ons Kéfi-Daly Yahia
- Research Group on Oceanography and Plankton Ecology, Tunisian National Institute of Agronomy (INAT), 43 Avenue Charles Nicolle, IRESA- Carthage University, LR18ES41 (Tunis El Manar University), Tunis, 1082, Tunisia
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21
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Boisnoir A, Pascal PY, Cordonnier S, Lemée R. Spatio-temporal dynamics and biotic substrate preferences of benthic dinoflagellates in the Lesser Antilles, Caribbean sea. HARMFUL ALGAE 2019; 81:18-29. [PMID: 30638495 DOI: 10.1016/j.hal.2018.11.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 11/18/2018] [Accepted: 11/21/2018] [Indexed: 06/09/2023]
Abstract
Epibenthic dinoflagellates were monitored monthly over an 18 month period in Guadeloupe and Martinique (Lesser Antilles, Caribbean Sea). These islands are located in the second most affected ciguatera fish poisoning (CFP) region of the world. Guadeloupe presented five times more total epibenthic dinoflagellates and two times less abundant Gambierdiscus spp. compared to Martinique, although the area of frequent CFP outbreaks covers Guadeloupe and not Martinique. Results did not show any clear seasonal variations of benthic dinoflagellates abundances. Temperature and salinity were not driving parameters in the evolution of total benthic dinoflagellate abundances. Preferential associations were found between macrophyte species and epibenthic dinoflagellates. The Phaeophyceae Dictyota spp. hosted the highest abundances of total epibenthic dinoflagellates, composed mainly of Ostrepsis and Prorocentrum genera. The seagrass Halophila stipulacea hosted the highest abundances of Gambierdiscus spp. and Sinophysis spp. whilst the highest abundance of Coolia was determined on Galaxaura spp. The pelagic Sargassum spp. hosted the lowest abundances of benthic dinoflagellates including the genus Gambierdiscus.
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Affiliation(s)
- Aurélie Boisnoir
- Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, Université des Antilles. Équipe Biologie de la mangrove. UFR SEN. 97100 Pointe-à-Pitre. France; Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230 Villefranche-sur-Mer, France.
| | - Pierre-Yves Pascal
- Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, Université des Antilles. Équipe Biologie de la mangrove. UFR SEN. 97100 Pointe-à-Pitre. France
| | - Sébastien Cordonnier
- Institut de Systématique, Évolution, Biodiversité, ISYEB, UMR 7205, Université des Antilles. Équipe Biologie de la mangrove. UFR SEN. 97100 Pointe-à-Pitre. France
| | - Rodolphe Lemée
- Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV, F-06230 Villefranche-sur-Mer, France
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22
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Meroni L, Chiantore M, Petrillo M, Asnaghi V. Habitat effects on Ostreopsis cf. ovata bloom dynamics. HARMFUL ALGAE 2018; 80:64-71. [PMID: 30502813 DOI: 10.1016/j.hal.2018.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 09/25/2018] [Accepted: 09/25/2018] [Indexed: 06/09/2023]
Abstract
In the last few decades, Ostreopsis spp., toxic benthic dinolagellates of tropical origin, generated large interest in the Mediterranean Sea, where several bloom events have been observed. Ecology and proliferation dynamics of O. cf. ovata are driven by complex interactions among biotic and abiotic drivers, and understanding mechanisms triggering bloom events is still far from being complete. The aim of the present study is to highlight the role of different habitat conditions, elucidating the effects of i) exposure to hydrodynamic conditions, ii) macroalgal community and iii) urbanisation level, in driving O. cf. ovata bloom dynamics. A significant effect of hydrodynamics was observed only for cells in seawater, with higher abundances in sheltered zones, irrespective of the urbanisation level. Similarly, a significant effect of the dominant macroalgal community, with higher abundances in Corallinales and turf dominated communities, and lower ones in Cystoseira amentacea canopies, has been recorded, consistently in the differently urbanised sites. Additionally, stretches of the coast suffering from a more intense anthropic exploitation are in general more prone to the proliferation of potentially toxic benthic microalgae. All these results imply a larger risk exposure to toxic effects for humans in urban beaches and sheltered areas, usually more attended by swimmers and bathers. These findings underline the need to preserve, and eventually restore, canopy dominated assemblages, which presently are under regression because of human threats, providing a straightforward example that restoration of relevant habitats implies a cascading improvement of human welfare.
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Affiliation(s)
- L Meroni
- DISTAV, University of Genoa, C.so Europa 26, Genoa, Italy
| | - M Chiantore
- DISTAV, University of Genoa, C.so Europa 26, Genoa, Italy; CNR-IBF, via De Marini 5, Genoa, Italy
| | - M Petrillo
- DISTAV, University of Genoa, C.so Europa 26, Genoa, Italy
| | - V Asnaghi
- DISTAV, University of Genoa, C.so Europa 26, Genoa, Italy; CoNISMa, P.le Flaminio 9, Rome, Italy.
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Hachani MA, Dhib A, Fathalli A, Ziadi B, Turki S, Aleya L. Harmful epiphytic dinoflagellate assemblages on macrophytes in the Gulf of Tunis. HARMFUL ALGAE 2018; 77:29-42. [PMID: 30005800 DOI: 10.1016/j.hal.2018.06.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 06/10/2018] [Accepted: 06/10/2018] [Indexed: 06/08/2023]
Abstract
The spatio-temporal distribution of epiphytic and planktonic microalgae coupled with environmental factors was investigated for a one-year period in the Gulf of Tunis (northeastern Tunisia). Harmful microalgae assemblages were dominated by three toxic epiphytic dinoflagellates: Ostreopsis sp., Prorocentrum lima and Coolia monotis. They were observed, both on macrophytes (1.03 × 105 cells g-1 FW ; 1.3 × 104 cells g-1 FW and 865 cells g-1 FW, respectively) and in the water column (2.35 × 104 cells L-1; 3.72 × 103 cells L-1; 1.04 × 103 cells L-1, respectively). Species abundances decreased with depth and maximum concentrations were found in shallow waters (0.5-1 m). The highest species abundance was registered both on macroalgae and seagrass with no special preference observed for either of these substrates. Redundancy analyses (RDA) show significant changes in these species abundances according to sites and seasons. The proliferation of Ostreopsis sp. is widespread in summer, when water temperature is warm, and especially in bay zones. The occurrence of P. lima and C. monotis blooms was mainly correlated to nutrients. In this study, macrophyte beds in the Gulf of Tunis were a reservoir of potentially toxic species that could pose a real threat, both to ecosystems and to public health.
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Affiliation(s)
- Mohamed Amine Hachani
- Institut National des Sciences et Technologies de la Mer (INSTM), Centre la Goulette, Tunisie et la Faculté desSciencesde Tunis, Tunisia; Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030 Besançon, France
| | - Amel Dhib
- Institut National des Sciences et Technologies de la Mer (INSTM), Centre la Goulette, Tunisie et la Faculté desSciencesde Tunis, Tunisia; Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030 Besançon, France
| | - Afef Fathalli
- Institut National des Sciences et Technologies de la Mer (INSTM), Centre la Goulette, Tunisie et la Faculté desSciencesde Tunis, Tunisia
| | - Boutheina Ziadi
- Institut National des Sciences et Technologies de la Mer (INSTM), Centre la Goulette, Tunisie et la Faculté desSciencesde Tunis, Tunisia
| | - Souad Turki
- Institut National des Sciences et Technologies de la Mer (INSTM), Centre la Goulette, Tunisie et la Faculté desSciencesde Tunis, Tunisia
| | - Lotfi Aleya
- Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030 Besançon, France.
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Abadie E, Chiantella C, Crottier A, Rhodes L, Masseret E, Berteaux T, Laabir M. What are the main environmental factors driving the development of the neurotoxic dinoflagellate Vulcanodinium rugosum in a Mediterranean ecosystem (Ingril lagoon, France)? HARMFUL ALGAE 2018; 75:75-86. [PMID: 29778227 DOI: 10.1016/j.hal.2018.03.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 03/25/2018] [Accepted: 03/29/2018] [Indexed: 06/08/2023]
Abstract
Vulcanodinium rugosum, a dinoflagellate developing in Ingril Lagoon (Mediterranean, France) is responsible for shellfish intoxications due to the neurotoxin pinnatoxin G. A one year survey (March 2012-April 2013) was conducted in this oligotrophic shallow lagoon and key environmental parameters were recorded (temperature, salinity and nutrients). The spatio-temporal distribution of V. rugosum in water column and on macrophytes was also determined. Planktonic cells of V. rugosum were observed at all sampling stations, but in relatively low concentrations (maximum of 1000 cell/L). The highest abundances were observed from June to September 2012. There was a positive correlation between cell densities and both temperature and salinity. Non-motile cells were detected on macrophytes, with a maximum concentration of 6300 cells/g wet weight. Nitrite and ammonium were negatively related to V. rugosum abundance whereas total nitrogen, total phosphorus and phosphates showed a positive correlation. Altogether, in situ results suggest that V. rugosum is rather thermophilic and that organic nutrients should be considered when studying the nutrition requirements for this noxious expanding dinoflagellate.
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Affiliation(s)
- Eric Abadie
- IFREMER, Laboratoire Environnement Ressources du Languedoc-Roussillon, Centre for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, CS30171, Sete Cedex 03, France.
| | - Claude Chiantella
- IFREMER, Laboratoire Environnement Ressources du Languedoc-Roussillon, Centre for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, CS30171, Sete Cedex 03, France
| | - Anaïs Crottier
- IFREMER, Laboratoire Environnement Ressources du Languedoc-Roussillon, Centre for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, CS30171, Sete Cedex 03, France
| | - Lesley Rhodes
- Cawthron Institute, 98 Halifax Street East, Private Bag 2, Nelson, 7042, New Zealand
| | - Estelle Masseret
- Université de Montpellier, Center for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, Place E. Bataillon, CC93, 34095, Montpellier Cedex 5, France
| | - Tom Berteaux
- IFREMER, Laboratoire Environnement Ressources du Languedoc-Roussillon, Centre for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, CS30171, Sete Cedex 03, France
| | - Mohamed Laabir
- Université de Montpellier, Center for Marine Biodiversity, Exploitation and Conservation (MARBEC), IRD, Ifremer, CNRS, Université de Montpellier, Place E. Bataillon, CC93, 34095, Montpellier Cedex 5, France
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Toxicity and Growth Assessments of Three Thermophilic Benthic Dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) Developing in the Southern Mediterranean Basin. Toxins (Basel) 2016; 8:toxins8100297. [PMID: 27754462 PMCID: PMC5086657 DOI: 10.3390/toxins8100297] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 09/20/2016] [Accepted: 09/30/2016] [Indexed: 01/26/2023] Open
Abstract
Harmful benthic dinoflagellates, usually developing in tropical areas, are expanding to temperate ecosystems facing water warming. Reports on harmful benthic species are particularly scarce in the Southern Mediterranean Sea. For the first time, three thermophilic benthic dinoflagellates (Ostreopsis cf. ovata, Prorocentrum lima and Coolia monotis) were isolated from Bizerte Bay (Tunisia, Mediterranean) and monoclonal cultures established. The ribotyping confirmed the morphological identification of the three species. Maximum growth rates were 0.59 ± 0.08 d−1 for O. cf. ovata, 0.35 ± 0.01 d−1 for C. monotis and 0.33 ± 0.04 d−1 for P. lima. Toxin analyses revealed the presence of ovatoxin-a and ovatoxin-b in O. cf. ovata cells. Okadaic acid and dinophysistoxin-1 were detected in P. lima cultures. For C. monotis, a chromatographic peak at 5.6 min with a mass m/z = 1061.768 was observed, but did not correspond to a mono-sulfated analogue of the yessotoxin. A comparison of the toxicity and growth characteristics of these dinoflagellates, distributed worldwide, is proposed.
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