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Chai X, Zheng L, Liu J, Zhan J, Song L. Comparison of photosynthetic responses between haptophyte Phaeocystis globosa and diatom Skeletonema costatum under phosphorus limitation. Front Microbiol 2023; 14:1085176. [PMID: 36756351 PMCID: PMC9899818 DOI: 10.3389/fmicb.2023.1085176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 01/06/2023] [Indexed: 01/24/2023] Open
Abstract
The diatom Skeletonema costatum and the haptophyte Phaeocystis globosa often form blooms in the coastal waters of the South China Sea. Skeletonema costatum commonly dominates in nutrient enrichment coastal waters, whereas P. globosa starts flourishing after the diatom blooms when phosphorus (P) is limited. Therefore, P limitation was proposed to be a critical factor affecting diatom-haptophyte transition. To elucidate the tolerance to P limitation in P. globosa compared with S. costatum, the effect of P limitation on their photosystem II (PSII) performance was investigated and their photosynthesis acclimation strategies in response to P limitation were evaluated. P limitation did not affect the growth of P. globosa over 7 days but decreased it for S. costatum. Correspondingly, the PSII activity of S. costatum was significantly inhibited by P limitation. The decline in PSII activity in S. costatum under P limitation was associated with the impairment of the oxygen-evolving complex (the donor side of PSII), the hindrance of electron transport from QA - to QB (the acceptor side of PSII), and the inhibition of electron transport to photosystem I (PSI). The 100% decrease in D1 protein level of S. costatum after P limitation for 6 days and PsbO protein level after 2 days of P limitation were attributed to its enhanced photoinhibition. In contrast, P. globosa maintained its photosynthetic activity with minor impairment of the function of PSII. With accelerated PSII repair and highly increased non-photochemical quenching (NPQ), P. globosa can avoid serious PSII damage under P limitation. On the contrary, S. costatum decreased its D1 restoration under P limitation, and the maximum NPQ value in S. costatum was only one-sixth of that in P. globosa. The present work provides extensive evidence that a close interaction exists between the tolerance to P limitation and photosynthetic responses of S. costatum and P. globosa.
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Affiliation(s)
- Xiaojie Chai
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China,College of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - Lingling Zheng
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Jin Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Jiao Zhan
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China,*Correspondence: Jiao Zhan, ✉
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
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van der Meer J, Hin V, van Oort P, van de Wolfshaar KE. A simple DEB-based ecosystem model. CONSERVATION PHYSIOLOGY 2022; 10:coac057. [PMID: 35949258 PMCID: PMC9358698 DOI: 10.1093/conphys/coac057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 07/11/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
A minimum stoichiometric carbon and nitrogen model of an entire ecosystem based on Dynamic Energy Budget (DEB) theory is presented. The ecosystem contains nutrients, producers, consumers, decomposers and detritus. All three living groups consist of somatic structure and either one (consumers and decomposers) or two (producers) reserve compartments, hence the living matter is described by seven state variables. Four types of detritus are distinguished. As the system is closed for matter, the dynamics of the nutrients carbon dioxide and ammonium follow automatically from the dynamics of the other 11 state variables. All DEB organisms in the model are V1-morphs, which means that surface area of each organism is proportional to volume. The resulting ontogenetic symmetry implies that complicated modelling of size structure is not required. The DEB V1-morph model is explained in detail, and the same holds for the idea of synthesizing units, which plays a key role in DEB modelling. First results of system dynamics are presented.
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Affiliation(s)
- Jaap van der Meer
- Wageningen Marine Research, Korringaweg 7, 4401 NT Yerseke, The Netherlands, , +31 317 488105
| | - Vincent Hin
- Wageningen Marine Research, Korringaweg 7, 4401 NT Yerseke, The Netherlands, , +31 317 488105
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Moncelon R, Metzger E, Pineau P, Emery C, Bénéteau E, de Lignières C, Philippine O, Robin FX, Dupuy C. Drivers for primary producers' dynamics: New insights on annual benthos pelagos monitoring in anthropised freshwater marshes (Charente-Maritime, France). WATER RESEARCH 2022; 221:118718. [PMID: 35749922 DOI: 10.1016/j.watres.2022.118718] [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: 03/01/2022] [Revised: 06/03/2022] [Accepted: 06/04/2022] [Indexed: 06/15/2023]
Abstract
Wetlands, especially marshes, support many services such as carbon catchment control or water purification led by primary producers such as phytoplankton and microphytobenthos (PB). The impact of the sedimentary compartment, as source and sink of essential nutrients for the water column, is often neglected in the study of their dynamics and water purification capacity of the systems. This work compared monthly (between February 2020 and April 2021) the benthic and pelagic primary producers' dynamics in two anthropised freshwater marshes (Marans and Genouillé), with the simultaneous follow-up of physico-chemical parameters of the water column and nutrient fluxes at the sediment-water (SWI) interface. It was suggested a strong contribution of phytoplankton (pumping) and the benthic compartment (denitrification) to the water purification of these two nitrates (NO3-)-rich marshes. Total phytoplankton production fluctuated between ∼5 (winter) and 1500 mg C m-3 d-1 (fall) at Marans and between 40 (winter) and ∼750 mg C m-3 d-1 (spring) at Genouillé. At Marans, soluble reactive phosphorus (SRP) benthic effluxes (-2.101 to -6.102 µmol m-2 d-1 in fall and summer, respectively) coincided with phytoplankton bloom periods. These effluxes were inhibited by NO3- penetration in the sediment (0 to 5.104 µmol m-2 d-1), by inhibiting iron respiration. At Genouillé, inhibition of SRP effluxes depended on denitrification rate and on P stocks in the sediment, where slight SRP effluxes (-101 µmol m-2 d-1) could have co-occurred with slight NO3- influxes (5.102 µmol m-2 d-1) in spring. The presence of PB (between 10-60 and 40-120 mg gsed-1 at Marans and Genouillé, respectively), suggested a strong contribution of the benthic compartment to the total primary production (benthic and pelagic through resuspension processes) in these environments. This work encourages to consider the benthos and the pelagos as a unicum to provide better sustainable management of such systems and limit eutrophication risks in coastal areas.
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Affiliation(s)
- Raphaël Moncelon
- Laboratoire LIENSs, UMR 7266, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France.
| | - Edouard Metzger
- Laboratoire de Planétologie et Géosciences, CNRS, Université d'Angers, Nantes Université, Le Mans Université, Angers, France
| | - Philippe Pineau
- Laboratoire LIENSs, UMR 7266, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | - Claire Emery
- Laboratoire LIENSs, UMR 7266, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | - Eric Bénéteau
- Laboratoire de Planétologie et Géosciences, CNRS, Université d'Angers, Nantes Université, Le Mans Université, Angers, France
| | - Charlotte de Lignières
- Laboratoire LIENSs, UMR 7266, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | | | | | - Christine Dupuy
- Laboratoire LIENSs, UMR 7266, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
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Spatiotemporal Variation in Phytoplankton and Physiochemical Factors during Phaeocystis globosa Red-Tide Blooms in the Northern Beibu Gulf of China. WATER 2022. [DOI: 10.3390/w14071099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Phaeocystis globosa blooms frequently in the Beibu Gulf of China. This species has a distinct life cycle that includes colonies and solitary cells. Colonies are formed during a bloom, while solitary cells are produced between blooms. Information about the abundance of solitary cells and other picophytoplankton in the northern Beibu Gulf is limited. To elucidate phytoplankton variation trends during periods of frequent P. globosa blooms and to determine the main physiochemical factors affecting phytoplankton distribution, four cruises were conducted between November 2018 and April 2019. Seawater was collected, and water temperature, salinity, and nutrient concentrations were simultaneously determined. Redundancy analysis was performed to understand the relationship between environmental factors and phytoplankton assemblages. Seven phytoplankton clusters were present during the cruises. Picophytoplankton abundance (including Synechococcus and Picoeukaryote groups I and II) dominated during the four cruises. Synechococcus abundance was restricted by the low temperatures in winter, decreasing from November to February and increasing in April. Picoeukaryote I abundance was almost unaffected by low temperatures and was mainly affected by nutrient concentration. P. globosa solitary cell abundance increased from November to January and decreased in February and April, and phosphorus was the key factor affecting P. globosa blooms. This is the first study to reveal the abundance and distribution of P. globosa solitary cells in this area.
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Environmental Impact on Harmful Species Pseudo-nitzschia spp. and Phaeocystis globosa Phenology and Niche. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2022. [DOI: 10.3390/jmse10020174] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Global environmental change modifies the phytoplankton community, which leads to variations in their phenology and potentially causes a temporal mismatch between primary producers and consumers. In parallel, phytoplankton community change can favor the appearance of harmful species, which makes the understanding of the mechanisms involved in structuring phytoplankton ecological niches paramount for preventing future risk. In this study, we aimed to assess for the first time the relationship between environmental conditions, phenology and niche ecology of harmful species Phaeocystis globosa and the complex Pseudo-nitzschia along the French coast of the eastern English Channel. A new method of bloom detection within a time-series was developed, which allowed the characterization of 363 blooms by 22 phenological variables over 11 stations from 1998 to 2019. The pairwise quantification of asymmetric dependencies between the phenological variables revealed the implication of different mechanisms, common and distinct between the taxa studied. A PERMANOVA helped to reveal the importance of seasonal change in the environmental and community variables. The Outlying Mean and the Within Outlying Mean indexes allowed us to position the harmful taxa niche among the rest of community and quantify how their respective phenology impacted the dynamic of their subniches. We also discussed the possible hypothesis involved and the perspective of predictive models.
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Xu Q, Wang P, Huangleng J, Su H, Chen P, Chen X, Zhao H, Kang Z, Tang J, Jiang G, Li Z, Zou S, Dong K, Huang Y, Li N. Co-occurrence of chromophytic phytoplankton and the Vibrio community during Phaeocystis globosa blooms in the Beibu Gulf. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 805:150303. [PMID: 34537702 DOI: 10.1016/j.scitotenv.2021.150303] [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: 06/04/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Accumulating research evidence has revealed that harmful algal blooms (HABs) can substantially affect the community structures of phytoplankton and heterotrophic bacteria in marine ecosystems. However, little is known about their species-specific interactions between phytoplankton and heterotrophic bacteria during the HABs period and about their interaction shifts in response to blooms. From this perspective, we investigated the co-occurrence of chromophytic phytoplankton and Vibrio during Phaeocystis globosa blooms in the Beibu Gulf. The results showed that Vibrio communities were distinct during the blooms, and P. globosa blooms resulted in a decline in phytoplankton alpha diversity, revealing that the blooms could affect their community compositions. The regression lines between the Shannon indices and Bray-Curtis distances of phytoplankton and Vibrio showed positive correlations with each other (p < 0.001), suggesting that they may have intrageneric symbiotic interactions overall. In addition, network analysis further demonstrated that relationships between phytoplankton and Vibrio were dominated by positive correlations, and more interaction modules were observed during the blooms, revealing that the blooms intensified synergistic association and mutual symbiotic interactions between them. Environmental factors (SiO32-, NH4+, NO3- and TN,) and P. globosa density more deeply affected network interactions between phytoplankton and Vibrio during the periods of P. globosa blooms than those before the blooms and after the blooms. This study provided new insight to elucidate community structure and interaction relationships between phytoplankton and Vibrio in response to P. globosa blooms and their ecological effects in marine ecosystems.
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Affiliation(s)
- Qiangsheng Xu
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Pengbin Wang
- Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, 36 Baochubei Road, Hangzhou 310012, Zhejiang, People's Republic of China; Fourth Institute of Oceanography, Ministry of Natural Resources, 26 New Century Avenue, Beihai, 536000, Guangxi, People's Republic of China
| | - Jinghua Huangleng
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Huiqi Su
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Panyan Chen
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Xing Chen
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China; College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning 530004, Guangxi, People's Republic of China
| | - Huaxian Zhao
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Zhenjun Kang
- Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, 12 Binhai Avenue, Qinzhou 535011, Guangxi, People's Republic of China
| | - Jinli Tang
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Gonglingxia Jiang
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Zhuoting Li
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Shuqi Zou
- Department of biological sciences, Kyonggi University, 154-42, Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16227, South Korea
| | - Ke Dong
- Department of biological sciences, Kyonggi University, 154-42, Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16227, South Korea
| | - Yuqing Huang
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China
| | - Nan Li
- Key Laboratory of Ministry of Education for Environment Change and Resources Use in Beibu Gulf, Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation, Nanning Normal University, 175 East Mingxiu Road, Nanning 530001, Guangxi, People's Republic of China.
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Trombetta T, Vidussi F, Roques C, Mas S, Scotti M, Mostajir B. Co-occurrence networks reveal the central role of temperature in structuring the plankton community of the Thau Lagoon. Sci Rep 2021; 11:17675. [PMID: 34480057 PMCID: PMC8417261 DOI: 10.1038/s41598-021-97173-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 08/18/2021] [Indexed: 02/07/2023] Open
Abstract
To identify the environmental factors that drive plankton community composition and structure in coastal waters, a shallow northwestern Mediterranean lagoon was monitored from winter to spring in two contrasting years. The campaign was based on high-frequency recordings of hydrological and meteorological parameters and weekly samplings of nutrients and the plankton community. The collected data allowed the construction of correlation networks, which revealed that water temperature was the most important factor governing community composition, structure and succession at different trophic levels, suggesting its ubiquitous food web control. Temperature favoured phytoplanktonic flagellates (Cryptophyceae, Chrysophyceae, and Chlorophyceae) and ciliates during winter and early spring. In contrast, it favoured Bacillariophyceae, dinoflagellates, phytoplankton < 6 µm and aloricate Choreotrichida during spring. The secondary factors were light, which influenced phytoplankton, and wind, which may regulate turbidity and the nutrient supply from land or sediment, thus affecting benthic species such as Nitzschia sp. and Uronema sp. or salinity-tolerant species such as Prorocentrum sp. The central role of temperature in structuring the co-occurrence network suggests that future global warming could deeply modify plankton communities in shallow coastal zones, affecting whole-food web functioning.
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Affiliation(s)
- Thomas Trombetta
- grid.121334.60000 0001 2097 0141MARBEC (Marine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Francesca Vidussi
- grid.121334.60000 0001 2097 0141MARBEC (Marine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Cécile Roques
- grid.121334.60000 0001 2097 0141MARBEC (Marine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Sébastien Mas
- grid.121334.60000 0001 2097 0141MEDIMEER (Mediterranean Platform for Marine Ecosystems Experimental Research), OSU OREME, Univ Montpellier, CNRS, IRD, IRSTEA, Sète, France
| | - Marco Scotti
- grid.15649.3f0000 0000 9056 9663GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Behzad Mostajir
- grid.121334.60000 0001 2097 0141MARBEC (Marine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
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Moncelon R, Gouazé M, Pineau P, Bénéteau E, Bréret M, Philippine O, Robin FX, Dupuy C, Metzger E. Coupling between sediment biogeochemistry and phytoplankton development in a temperate freshwater marsh (Charente-Maritime, France): Evidence of temporal pattern. WATER RESEARCH 2021; 189:116567. [PMID: 33161327 DOI: 10.1016/j.watres.2020.116567] [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: 06/25/2020] [Revised: 09/26/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
In freshwater systems, sediment can be an important source for the internal loading of PO4. The limiting character of this element in such system leads to consider this phenomenon in terms of eutrophication risks and water quality stakes. A four-months follow-up (January, March, April and May 2019) was carried out in a strong phosphate (PO4) limited secondary channel from an artificial irrigation system of Charente Maritime (France) to link the mobilization of remineralization products in the upper 6 cm layer of sediment (conventional core slicing/centrifugation and DET probes) and the phytoplankton biomass dynamics in the water column. Results showed congruent patterns between the temporal succession of the organic matter mineralization processes in the sediment and the primary biomass dynamics in the water column. In January and March (considered in winter), PO4 proved to be retained by adsorption onto iron oxides in anoxic sediment since pore water nitrate inhibited for about a month the respiration of metal oxides in the first cm of sediment, thus limiting PO4 availability and the phytoplankton growth. In April and May (early spring), after exhaustion of pore water nitrate, the dissolutive reduction of iron oxides released PO4 into pore water generated a significant diffusive outgoing flux from the sediment to the water column with a maximum in April (-1.10E-04±2.81E-05 nmol cm-2 s-1). This release coincided with the nanophytoplankton bloom (5.50 µg Chla L-1) and a potential increase of PO4 concentration in the water column. This work provides some insight on the importance of benthic-pelagic coupling in anthropogenic systems. This conceptual model has to be deployed on other sites of interest where internal loading of P takes precedence over external inputs and nitrate mitigation drives its benthic recycling and ultimately its bioavailability. This is to be essential to characterize the aquatic environment quality in order to limit eutrophication risks.
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Affiliation(s)
- Raphaël Moncelon
- Laboratoire LIENSs, UMR 6250, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France.
| | - Marie Gouazé
- Laboratoire LIENSs, UMR 6250, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | - Philippe Pineau
- Laboratoire LIENSs, UMR 6250, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | - Eric Bénéteau
- LPG-BIAF, Bio-Indicateurs Actuels et Fossiles, UMR CNRS 6112, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
| | - Martine Bréret
- Laboratoire LIENSs, UMR 6250, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | | | | | - Christine Dupuy
- Laboratoire LIENSs, UMR 6250, La Rochelle Université, Bâtiment ILE, 2 Rue Olympe de Gouges, La Rochelle, France
| | - Edouard Metzger
- LPG-BIAF, Bio-Indicateurs Actuels et Fossiles, UMR CNRS 6112, Université d'Angers, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
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Manuri DB, Chandrasekaran M, Perumal M, Mallavarapu RV. Environmental gradients along the tropical coast drive plankton biomass and alter food web interactions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:36186-36202. [PMID: 32557075 DOI: 10.1007/s11356-020-09488-4] [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: 08/29/2019] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Traditionally, the Bay of Bengal is considered as a less productive basin when compared with the neighbouring Arabian Sea. However, limited information is available for a comparative study between these two basins on plankton with relation to environmental properties of inshore waters. In order to understand the spatial variability in plankton biomass along tropical coastal waters, the analysis was carried out by collecting samples from 8 locations, covering both east and west coasts of India during dry and wet periods during 2011. Salinity showed considerable seasonal variability along west coast of India (WCI) and east coast of India (ECI); it has highly fluctuated during wet period along ECI. Suspended solids (SSC) and nitrate showed their concentrations along ECI than WCI. Phosphate and silicate exhibited significant seasonality along WCI, whereas insignificant along ECI. Inconsistency in the monsoonal runoff, physical processes and anthropogenic and terrestrial sources seems to be the major driving forces for these parameters. Nearly 3-fold higher phytoplankton biomass was noticed along WCI than ECI due to low SSC in the former region. Though the zooplankton population also followed the same pattern as phytoplankton, the difference between WCI and ECI is lesser than phytoplankton. Zooplankton abundance showed significant relation with phytoplankton and SSC along WCI and ECI, respectively. The present study reveals irrespective of nutrient concentrations; phytoplankton was dominantly constrained by light availability followed by grazers. Moreover, mesozooplankton was supported by not only phytoplankton but also alternative carbon sources; hence, variability in phytoplankton biomass and SSC leads to alterations in trophic interactions.
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Affiliation(s)
- Durga Bharathi Manuri
- National Centre for Coastal Research (NCCR), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikaranai, Chennai, 600100, India.
| | - Muthukumar Chandrasekaran
- National Centre for Coastal Research (NCCR), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikaranai, Chennai, 600100, India
| | - Madeswaran Perumal
- National Centre for Coastal Research (NCCR), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikaranai, Chennai, 600100, India
| | - Ramanamurthy Venkata Mallavarapu
- National Centre for Coastal Research (NCCR), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikaranai, Chennai, 600100, India
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Spatiotemporal Variation in Phytoplankton Community Driven by Environmental Factors in the Northern East China Sea. WATER 2020. [DOI: 10.3390/w12102695] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The East China Sea (ECS) is the largest marginal sea in the northern western Pacific Ocean. In comparison to various physical studies, little information on the seasonal patterns in community structure of phytoplankton is currently available. Based on high performance liquid chromatography (HPLC) pigment analysis, spatiotemporal variations in phytoplankton community compositions were investigated in the northern ECS. Water temperature and salinity generally decreased toward the western part of the study area but warmer conditions in August led to strong vertical stratification of the water column. In general, major inorganic nutrient concentrations were considerably higher in the western part with a shallow water depth, and consistent with previous results, had no discernable vertical pattern during our observation period except in August. This study also revealed PO4-limited environmental conditions in May and August. The monthly averaged integral chlorophyll-a concentration varied seasonally, highest (35.2 ± 20.22 mg m−2) in May and lowest (5.2 ± 2.54 mg m−2) in February. No distinct vertical differences in phytoplankton community compositions were observed for all the sampling seasons except in August when cyanobacteria predominated in the nutrient-deficient surface layer and diatoms prevailed at deep layer. Canonical correlation analysis results revealed that nutrient distribution and the water temperature were the major drivers of the vertical distribution of phytoplankton communities in August. Spatially, a noticeable difference in phytoplankton community structure between the eastern and western parts was observed in November with diatom domination in the western part and cyanobacteria domination in the eastern part, which were significantly (p < 0.01) correlated with water temperature, salinity, light conditions, and nutrient concentrations. Overall, the two major phytoplankton groups were diatoms (32.0%) and cyanobacteria (20.6%) in the northern ECS and the two groups were negatively correlated, which holds a significant ecological meaning under expected warming ocean conditions.
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Käse L, Kraberg AC, Metfies K, Neuhaus S, Sprong PAA, Fuchs BM, Boersma M, Wiltshire KH. Rapid succession drives spring community dynamics of small protists at Helgoland Roads, North Sea. JOURNAL OF PLANKTON RESEARCH 2020; 42:305-319. [PMID: 32494090 PMCID: PMC7252501 DOI: 10.1093/plankt/fbaa017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 03/12/2020] [Accepted: 03/13/2020] [Indexed: 05/22/2023]
Abstract
The dynamics of diatoms and dinoflagellates have been monitored for many decades at the Helgoland Roads Long-Term Ecological Research site and are relatively well understood. In contrast, small-sized eukaryotic microbes and their community changes are still much more elusive, mainly due to their small size and uniform morphology, which makes them difficult to identify microscopically. By using next-generation sequencing, we wanted to shed light on the Helgoland planktonic community dynamics, including nano- and picoplankton, during a spring bloom. We took samples from March to May 2016 and sequenced the V4 region of the 18S rDNA. Our results showed that mixotrophic and heterotrophic taxa were more abundant than autotrophic diatoms. Dinoflagellates dominated the sequence assemblage, and several small-sized eukaryotic microbes like Haptophyta, Choanoflagellata, Marine Stramenopiles and Syndiniales were identified. A diverse background community including taxa from all size classes was present during the whole sampling period. Five phases with several communities were distinguished. The fastest changes in community composition took place in phase 3, while the communities from phases 1 to 5 were more similar to each other despite contrasting environmental conditions. Synergy effects of next-generation sequencing and traditional methods may be exploited in future long-term observations.
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Affiliation(s)
- Laura Käse
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, BIOLOGISCHE ANSTALT HELGOLAND, 27498 HELGOLAND, Germany
- CORRESPONDING AUTHOR:
| | - Alexandra C Kraberg
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, 27570 BREMERHAVEN, Germany
| | - Katja Metfies
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, 27570 BREMERHAVEN, Germany
- HELMHOLTZ-INSTITUT FüR FUNKTIONELLE MARINE BIODIVERSITäT, 26129 OLDENBURG, Germany
| | - Stefan Neuhaus
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, 27570 BREMERHAVEN, Germany
| | - Pim A A Sprong
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, 27570 BREMERHAVEN, Germany
| | - Bernhard M Fuchs
- DEPARTMENT OF MOLECULAR ECOLOGY, MAX PLANCK INSTITUTE FOR MARINE MICROBIOLOGY, 28359 BREMEN, Germany
| | - Maarten Boersma
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, BIOLOGISCHE ANSTALT HELGOLAND, 27498 HELGOLAND, Germany
- UNIVERSITY OF BREMEN, 28359 BREMEN, Germany
| | - Karen H Wiltshire
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, BIOLOGISCHE ANSTALT HELGOLAND, 27498 HELGOLAND, Germany
- ALFRED-WEGENER-INSTITUT, HELMHOLTZ-ZENTRUM FüR POLAR- UND MEERESFORSCHUNG, WADDEN SEA STATION, 25992 LIST AUF SYLT, Germany
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Karasiewicz S, Chapelle A, Bacher C, Soudant D. Harmful algae niche responses to environmental and community variation along the French coast. HARMFUL ALGAE 2020; 93:101785. [PMID: 32307069 DOI: 10.1016/j.hal.2020.101785] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 02/14/2020] [Accepted: 02/21/2020] [Indexed: 06/11/2023]
Abstract
Distribution, frequency and intensity of harmful phytoplanktonic species are impacted by changes in environmental conditions. In the Bay of Brest, Alexandrium minutum has been responsible for several harmful algal blooms (HABs) associated with toxin production causing paralytic shellfish poisoning (PSP). Additionally, Lepidodinium chlorophorum causes green water and hypoxia locally in the Bay of Biscay. Previous studies revealed that L. chlorophorum's success was related to possible competitive exclusion. Therefore, the phytoplankton composition and the environmental conditions should be taken into account. This study aims to assess the combined effect of changes in habitat conditions and community structure with the occurrence of HAB species, on a spatial-temporal scale. For the investigation we first used the Hutchinson's niche concept by means of the Outlying Mean Index (OMI) analysis. The OMI analysis enable us to observe the environmental variables defining the ecological niche of the harmful species among the community. Secondly, we used the subniche theory to highlight the environmental variables defining the subniches in cases of high and low abundance of HABs with an estimation of the biological constraint restricting the species' subniche. This was undertaken using the Within Outlying Mean indexes (WitOMI) calculated under environmental conditions promoting high (H) and low (L) abundance bloom. Thirdly, we used the Indicator Species Concept from the Indicator Species Analysis (ISA) to link the biological restriction with potential competing or indicator species. We combined a data set from the French National Phytoplankton and Phycotoxin Monitoring Network (REPHY), the Velyger network (oyster monitoring program) and satellite imagery. A total of 44 stations, over the period of 1998-2017 using 50 taxonomic units. 36 taxa had significant niche and were mostly distributed along nutrient and salinity gradients. The two species of interest L. chlorophorum and A. minutum seemed to have similar affinity for summer-like environmental conditions and both used a marginal habitat compared to the rest of the community. A. minutum had a larger niche due to a greater affinity to the estuarine-like conditions. The subniche of the two species had a similar response to the environmental variation; their respective abundance was partly caused by greater environmental restrains. Their success in abundance appeared to be linked to local hydrodynamics which increases or reduces resources. On the other hand, the biotic pressure exerted upon A. minutum and L. chlorophorum were antagonistic. A possible competitor assemblage was exposed but the analysis was inconclusive. The methodological limitations were discussed as well as a perspective for future similar studies.
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Affiliation(s)
- Stéphane Karasiewicz
- IFREMER-Centre de Bretagne, ODE/DYNECO, Plouzané, France; IFREMER-Centre de Bretagne, ODE/DYNECO, Plouzané, France.
| | - Annie Chapelle
- IFREMER-Centre de Bretagne, ODE/DYNECO, Plouzané, France
| | - Cédric Bacher
- IFREMER-Centre de Bretagne, ODE/DYNECO, Plouzané, France
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Karasiewicz S, Breton E, Lefebvre A, Hernández Fariñas T, Lefebvre S. Realized niche analysis of phytoplankton communities involving HAB: Phaeocystis spp. as a case study. HARMFUL ALGAE 2018; 72:1-13. [PMID: 29413380 DOI: 10.1016/j.hal.2017.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 12/09/2017] [Accepted: 12/11/2017] [Indexed: 06/08/2023]
Abstract
The link between harmful algal blooms, phytoplankton community dynamics and global environmental change is not well understood. To tackle this challenging question, a new method was used to reveal how phytoplankton communities responded to environmental change with the occurrence of an harmful algae, using the coastal waters of the eastern English Channel as a case study. The great interannual variability in the magnitude and intensity of Phaeocystis spp. blooms, along with diatoms, compared to the ongoing gradual decrease in anthropogenic nutrient concentration and rebalancing of nutrient ratios; suggests that other factors, such as competition for resources, may also play an important role. A realized niche approach was used with the Outlying Mean Index analysis and the dynamics of the species' realized subniches were estimated using the Within Outlying Mean Indexes calculations under low (L) and high (H) contrasting Phaeocystis spp. abundance. The Within Outlying Mean Indexes allows the decomposition of the realized niche into realized subniches, found within the subset of habitat conditions and constrained by a subset of a biotic factor. The two contrasting scenarios were characterized by significantly different subsets of environmental conditions and diatom species (BV-step analysis), and different seasonality in salinity, turbidity, and nutrients. The subset L environmental conditions were potentially favorable for Phaeocystis spp. but it suffered from competitive exclusion by key diatom species such as Skeletonema spp., Thalassiosira gravida, Thalassionema nitzschioides and the Pseudo-nitzchia seriata complex. Accordingly, these diatoms species occupied 81% of Phaeocystis spp.'s existing fundamental subniche. In contrast, the greater number of diatoms, correlated with the community trend, within subset H exerted a weaker biological constraint and favored Phaeocystis spp. realized subniche expansion. In conclusion, the results strongly suggest that both abiotic and biotic interactions should be considered to understand Phaeocystis spp. blooms with greater consideration of the preceeding diatoms. HABs needs must therefore be studied as part of the total phytoplankton community.
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Affiliation(s)
- Stéphane Karasiewicz
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG Laboratoire d'Océanologie et Géosciences, F 62930 Wimereux, France.
| | - Elsa Breton
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG Laboratoire d'Océanologie et Géosciences, F 62930 Wimereux, France
| | - Alain Lefebvre
- Ifremer, laboratoire Environnement et ressources du centre Manche Mer du Nord, 150 quai Gambetta, BP 699, 62321 Boulogne-sur-Mer, France
| | - Tania Hernández Fariñas
- Ifremer, Laboratoire Environnement Ressources de Normandie, Avenue du Général de Gaulle, BP 32, 14520 Port en Bessin, France
| | - Sébastien Lefebvre
- Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG Laboratoire d'Océanologie et Géosciences, F 62930 Wimereux, France; Ifremer, Laboratoire Ressources Halieutiques, 150 Quai Gambetta BP 699, F-62321 Boulogne sur mer, France
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Bharathi MD, Sundaramoorthy S, Madeswaran P, Sundaramanickam A. Elucidation of seasonal variations of physicochemical and biological parameters with statistical analysis methods in Puducherry coastal waters. MARINE POLLUTION BULLETIN 2017; 122:432-440. [PMID: 28552252 DOI: 10.1016/j.marpolbul.2017.05.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 05/11/2017] [Accepted: 05/19/2017] [Indexed: 06/07/2023]
Abstract
The present investigation aimed to study the effect of monsoonal and anthropogenic influences on the water quality parameters of Puducherry coastal waters. Surface water sampling was performed at three fixed stations in four distinct seasons during 2011. Physical water quality parameters such as salinity and TSM showed strong seasonal and spatial variability. Evaporation and monsoonal runoff seem to be the major controlling forces for these parameters in the coastal waters. Seasonal distribution of the parameters showed a random pattern for nitrate and a well-defined pattern for silicate. Chl-a was minimum during monsoon when high TSM was encountered in the system. Moreover, factors that regulated the phytoplankton biomass varied with seasons. Moreover, TSM was strongly correlated with silicate. The relationship between Chl-a and nutrients were more consistent throughout the year, and much weaker correlations were noticed between Chl-a and TSM. Cluster analysis depicted the existence of a marked seasonal heterogeneity.
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Affiliation(s)
- M D Bharathi
- Integrated Coastal and Marine Area Management Project Directorate (ICMAM PD), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikkaranai, Chennai 600100, India..
| | - S Sundaramoorthy
- Integrated Coastal and Marine Area Management Project Directorate (ICMAM PD), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikkaranai, Chennai 600100, India
| | - P Madeswaran
- Integrated Coastal and Marine Area Management Project Directorate (ICMAM PD), 2nd Floor, NIOT Campus, Velacherry-Tambaram Main Road, Pallikkaranai, Chennai 600100, India
| | - A Sundaramanickam
- C.A.S. Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, India
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15
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Assessing the state of the lower level of the trophic web of a temperate lagoon, in situations of light or nutrient stress: A modeling study. Ecol Modell 2015. [DOI: 10.1016/j.ecolmodel.2015.06.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Simon M, López-García P, Deschamps P, Moreira D, Restoux G, Bertolino P, Jardillier L. Marked seasonality and high spatial variability of protist communities in shallow freshwater systems. ISME JOURNAL 2015; 9:1941-53. [PMID: 25853803 DOI: 10.1038/ismej.2015.6] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 12/02/2014] [Accepted: 12/11/2014] [Indexed: 11/09/2022]
Abstract
Small eukaryotes have key roles in aquatic ecosystems, influencing their local environment, global biogeochemical cycles and climate. Their impact depends on community structure, which varies along time. However, very few studies take into account temporal variation. This is especially true for small, shallow freshwater systems, which remain largely understudied despite their wide variety, global surface and intense microbial activity. We have monthly followed changes in the community structure of small microbial eukaryotes (0.2-5 μm cell diameter) for 2 years in four ponds and one brook located in North-Western France based on massive 18S rDNA amplicon 454 pyrosequencing. We detected a total of 3742 stringently defined operational taxonomic units (OTUs) encompassing all recognized eukaryotic supergroups and lineages of uncertain affiliation. Although geographically close, protist communities in the five ecosystems were contrasting, with very few shared OTUs, suggesting that environmental selection mainly drives community structure. The temporal dynamics of different high-rank taxa appeared complex and rapid at monthly scales. Despite this, a clear and reproducible seasonality was observed. As expected, low-abundance OTUs dominated the community. Although some of them appeared sporadically or remained at low frequencies during the survey, others occasionally reached relatively high abundances, sometimes recurrently. This shows that at least a fraction of low-abundance eukaryotes constitutes a seed bank. The annual proportion of primary producers, free-living heterotrophs and parasites appeared remarkably constant among the different ecosystems, suggesting underlying trends of ecosystem carrying capacity for these functional groups.
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Affiliation(s)
- Marianne Simon
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
| | | | - Philippe Deschamps
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
| | - David Moreira
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
| | - Gwendal Restoux
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
| | - Paola Bertolino
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
| | - Ludwig Jardillier
- Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, France
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Acheampong E, Hense I, St. John MA. A model for the description of feeding regulation by mesozooplankton under different conditions of temperature and prey nutritional status. Ecol Modell 2014. [DOI: 10.1016/j.ecolmodel.2013.09.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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18
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Queste BY, Fernand L, Jickells TD, Heywood KJ. Spatial extent and historical context of North Sea oxygen depletion in August 2010. BIOGEOCHEMISTRY 2013; 113:53-68. [PMID: 32355379 PMCID: PMC7175662 DOI: 10.1007/s10533-012-9729-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Accepted: 03/15/2012] [Indexed: 05/06/2023]
Abstract
Prompted by recent observations of seasonal low dissolved oxygen from two moorings in the North Sea, a hydrographic survey in August 2010 mapped the spatial extent of summer oxygen depletion. Typical near-bed dissolved oxygen saturations in the stratified regions of the North Sea were 75-80 % while the well-mixed regions of the southern North Sea reached 90 %. Two regions of strong thermal stratification, the area between the Dooley and Central North Sea Currents and the area known as the Oyster Grounds, had oxygen saturations as low as 65 and 70 % (200 and 180 μmol dm-3) respectively. Low dissolved oxygen was apparent in regions characterised by low advection, high stratification, elevated organic matter production from the spring bloom and a deep chlorophyll maximum. Historical data over the last century from the International Council for the Exploration of the Sea oceanographic database highlight an increase in seasonal oxygen depletion and a warming over the past 20 years. The 2010 survey is consistent with, and reinforces, the signal of recent depleted oxygen at key locations seen in the (albeit sparse) historical data.
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Affiliation(s)
- Bastien Y. Queste
- School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ UK
| | - Liam Fernand
- Centre for Environment, Fisheries & Aquaculture Science (CEFAS), Pakefield Road, Lowestoft, NR33 0HT UK
| | - Timothy D. Jickells
- School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ UK
| | - Karen J. Heywood
- School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ UK
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Lopes JF, Almeida M, Cunha M. Modelling the ecological patterns of a temperate lagoon in a very wet spring season. Ecol Modell 2010. [DOI: 10.1016/j.ecolmodel.2010.06.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bouma JA, van der Woerd HJ, Kuik OJ. Assessing the value of information for water quality management in the North Sea. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2009; 90:1280-1288. [PMID: 18804324 DOI: 10.1016/j.jenvman.2008.07.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Revised: 04/24/2008] [Accepted: 07/24/2008] [Indexed: 05/26/2023]
Abstract
Global Earth Observation (GEO) is one of the most important sources of information for environmental resource management and disaster prevention. With budgets for GEO increasingly under pressure, it is becoming important to be able to quantify the returns to informational investments. For this, a clear analytical framework is lacking. By combining Bayesian decision theory with an empirical, stakeholder-oriented approach, this paper attempts to develop such a framework. The analysis focuses on the use of satellite observations for Dutch water quality management in the North Sea. Dutch water quality management currently relies on information from 'in situ' measurements but is considering extending and deepening its information base with satellite observations. To estimate returns to additional investments in satellite observation, we analyze the added value of an extended monitoring system for the management of eutrophication, potentially harmful algal blooms and suspended sediment and turbidity in the North Sea. First, we develop a model to make the potential contribution of information to welfare explicit. Second, we use this model to develop a questionnaire and interpret the results. The results indicate that the expected welfare impact of investing in satellite observation is positive, but that outcomes strongly depend on the accuracy of the information system and the range of informational benefits perceived.
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Affiliation(s)
- J A Bouma
- Institute for Environmental Studies, Vrije Universiteit, Amsterdam, The Netherlands.
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21
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Kim E, Archibald JM. Diversity and Evolution of Plastids and Their Genomes. PLANT CELL MONOGRAPHS 2008. [DOI: 10.1007/978-3-540-68696-5_1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Flynn KJ, Clark DR, Xue Y. MODELING THE RELEASE OF DISSOLVED ORGANIC MATTER BY PHYTOPLANKTON(1). JOURNAL OF PHYCOLOGY 2008; 44:1171-87. [PMID: 27041714 DOI: 10.1111/j.1529-8817.2008.00562.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Three models describing dissolved organic matter (DOM) flux and phytoplankton death, each of different levels of complexity, were constructed and tested against experimental data for a cyanobacterium, a chlorophyte, two diatoms, two dinoflagellates, and two prymnesiophytes. The simplest model described only bulk carbon (C) and nitrogen (N) forms of DOM (DOMC and DOMN ) and employed a fixed relationship between phytoplankton nutrient status and DOM release and death rate. The most complex model described fractions of DOM as low molecular weight dissolved organic carbon (DOC; saccharides, low molecular weight carbohydrates [DOCs]), low molecular weight nitrogenous material (comprising C and N as DOC associated with low molecular weight compounds containing amino acids and/or nucleic acids [DOCa] and N associated with DOCa [DONa], which included dissolved free amino acids [DFAA]), and more complex materials (DOC associated with high molecular weight compounds typically requiring extracellular degradation prior to uptake or use by microbes [DOCx] and N associated with DOCx [DONx]). It also employed descriptions of DOM flux and cell death related to nutrient status and growth rates. In all instances, material lysed from dead cells contributed to the DOM pool. All three models captured the gross dynamics of the primary data (dissolved inorganic C [DIC], dissolved inorganic N [DIN], particulate organic carbon [POC], particulate organic N [PON], DOC, dissolved organic N [DON]), but there was little or no improvement of the fit with increasing model complexity. However, the simplest models tended to employ excessively high growth rates to compensate for high fixed death rates. While the proportion of newly fixed C being liberated as DOMC (DOCs plus DOCa) increased as nutrient status declined, the actual rate of release typically did not do so and often declined. The most complex model gave predictions for changes in released saccharides and DFAA in keeping with expectations. The major obstacle to future progress is the lack of suitable, mass balanced data sets for further model testing.
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Affiliation(s)
- Kevin J Flynn
- Institute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UKPlymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth Devon PL1 3DH, UKInstitute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK
| | - Darren R Clark
- Institute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UKPlymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth Devon PL1 3DH, UKInstitute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK
| | - Yao Xue
- Institute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UKPlymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth Devon PL1 3DH, UKInstitute of Environmental Sustainability, Wallace Building, Swansea University, Singleton Park, Swansea SA2 8PP, UK
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Painting SJ, Devlin MJ, Rogers SI, Mills DK, Parker ER, Rees HL. Assessing the suitability of OSPAR EcoQOs for eutrophication vs ICES criteria for England and Wales. MARINE POLLUTION BULLETIN 2005; 50:1569-84. [PMID: 16083914 DOI: 10.1016/j.marpolbul.2005.06.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This paper provides a preliminary evaluation of the suitability of OSPAR Ecological Quality objectives for eutrophication for coastal and offshore waters of England and Wales on the basis of ICES criteria. In principle, EcoQOs are easy to understand, but responses to nutrient enrichment are complex. Few studies provide unequivocal evidence of links between inputs and response. Monitoring is generally feasible and in place, but needs to be improved. The best EcoQO is winter nutrient concentrations. Chlorophyll concentrations are a good indicator in environments susceptible to nutrient enrichment. The EcoQO for zoobenthos/fish kills potentially meets all criteria for a good indicator; EcoQOs for phytoplankton indicator species, oxygen concentrations and zoobenthos changes do not. Greater emphasis needs to be placed on seasonal effects of nutrient inputs and phytoplankton response, natural susceptibility of different water bodies, differences between coastal and offshore environments, and developing longer time series of data.
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Affiliation(s)
- S J Painting
- The Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, Suffolk NR33 0HT, UK.
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25
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Jennings S, Blanchard JL. Fish abundance with no fishing: predictions based on macroecological theory. J Anim Ecol 2004. [DOI: 10.1111/j.0021-8790.2004.00839.x] [Citation(s) in RCA: 204] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Walsh JJ. Decadal shifts in biophysical forcing of Arctic marine food webs: Numerical consequences. ACTA ACUST UNITED AC 2004. [DOI: 10.1029/2003jc001945] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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12 The North Sea Large Marine Ecosystem. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1570-0461(02)80064-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Reid PC, Edwards M. Long-term changes in the pelagos, benthos and fisheries of the North Sea. ACTA ACUST UNITED AC 2001. [DOI: 10.1007/bf03043021] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Moll A. Variabilität der Primärproduktion aus dreidimensionalen Modellrechnungen für die Nordsee mit ECOHAM1. ACTA ACUST UNITED AC 1999. [DOI: 10.1007/bf02933701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Reimer A, Brasse S, Doerffer R, Dürselen CD, Kempe S, Michaelis W, Rick HJ, Seifert R. Carbon cycling in the German Bight: An estimate of transformation processes and transport. ACTA ACUST UNITED AC 1999. [DOI: 10.1007/bf02764179] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Abstract
Tidal stirring gradients, interacting with seasonal variation in photosynthetically active radiation, sea-surface heating, and wind stirring, are proposed as the most important controls on plankton in the southern North Sea. The hypothesis, in the form of a numerical model, is tested against observations during 1988/89 of seasonal cycles and spatial variation in phyto- and zoo-plankton. The importance of the tidal mixing front, and the effects of residual circulation and nutrient-rich river discharges, are discussed, and estimates given of microplankton community production and its fate.
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Abstract
Measurements of oxygen uptake across the sediment-water interface suggested that between 17-45% of the net primary production in the southern North Sea was degraded in the bottom sediments. Similar measurements of nutrient exchange fluxes showed that the sediments were significant sources of nutrients transferred to the water column. The sediments are, therefore, important sites of organic matter degradation and nutrient recycling, and must be included in any models for the North Sea. The sediments are also accumulators of radionuclides, particularly associated with the silt/clay fraction. At one site in the more central area of the North Sea where the water column stratifies during summer, vertical profiles of radionuclides (
137
Cs,
239,240
Pu,
210
Pb) suggested a deposition rate of sediment of 0.3-0.6 cm a
-1
, but at other sites vertical sediment profiles were unsuitable to measure deposition.
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Bot PVM, Raaphorst W, Batten S, Laane RWPM, Philippart K, Radach G, Frohse A, Schultz H, Eynde D, Colijn F. Comparison of changes in the annual variability of the seasonal cycles of chlorophyll, nutrients and zooplankton at eight locations on the northwest european continental shelf (1960–1994). ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf02799378] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Tett P, Walne A. Observations and simulations of hydrography, nutrients and plankton in the southern North Sea. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/00785326.1995.10431514] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Escaravage V, Peperzak L, Prins TC, Peeters JCH, Joordens JCA. The development of aPhaeocystisbloom in a mesocosm experiment in relation to nutrients, irradiance and coexisting algae. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/00785326.1995.10431497] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Varela RA, Cruzado A, Gabaldón JE. Modelling primary production in the North Sea using the European Regional Seas Ecosystem Model. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0077-7579(95)90052-7] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Dinoflagellate resting cysts as factors in phytoplankton ecology of the North Sea. ACTA ACUST UNITED AC 1995. [DOI: 10.1007/bf02368363] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chattonella and Fibrocapsa (Raphidophyceae): First observation of, potentially harmful, red tide organisms in Dutch coastal waters. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0077-7579(95)90005-5] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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DOC storage in Arctic seas: The role of continental shelves. ACTA ACUST UNITED AC 1995. [DOI: 10.1029/ce049p0203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Hochman HT, Walsh JJ, Carder KL, Sournia A, Muller-Karger FE. Analysis of ocean color components within stratified and well-mixed waters of the western English Channel. ACTA ACUST UNITED AC 1995. [DOI: 10.1029/95jc00464] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Verification of annual growth increments in Arctica islandica L. from the North Sea by means of oxygen and carbon isotopes. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0077-7579(94)90054-x] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Interpretation of fluorometric chlorophyll registrations with Algal pigment analysis along a ferry transect in the Southern North Sea. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0077-7579(94)90049-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mills DK, Tett PB, Novarino G. The spring bloom in the south western North Sea in 1989. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0077-7579(94)90052-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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The human impact in the German Bight: Eutrophication during three decades (1962–1991). ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf02367167] [Citation(s) in RCA: 91] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hamerlynck O, Hostens K, Mees J, Arellano R, Cattrijsse A, Van De Vyver P, Craeymeersch J. The EBB tidal delta of the grevelingen: A man-made nursery for flatfish? ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0077-7579(92)90057-l] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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