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Morelle J, Maire O, Richard A, Slimani A, Orvain F. Contrasted impact of two macrofaunal species (Hediste diversicolor and Scrobicularia plana) on microphytobenthos spatial distribution and photosynthetic activity at microscale. MARINE ENVIRONMENTAL RESEARCH 2021; 163:105228. [PMID: 33302156 DOI: 10.1016/j.marenvres.2020.105228] [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: 09/01/2020] [Revised: 11/16/2020] [Accepted: 11/28/2020] [Indexed: 06/12/2023]
Abstract
Microphytobenthos is most often the primary source of carbon for coastal soft-sediment communities, especially in intertidal and shallow subtidal environments. The influence of benthic macrofaunal organisms on microphytobenthic biomass, spatial distribution and photosynthetic capacities is not only resulting from their feeding intensity but also indirectly from their bioturbation activity, which regulates nutrient fluxes and sediment mixing. This study compares the impact of two species (Hediste diversicolor and Scrobicularia plana) that dominate macrofaunal communities in estuarine intertidal mudflats on microphytobenthic biomass and photosynthetic activity. Imaging-PAM fluorescence was used to non-invasively map the development of microphytobenthic biomass and to assess its spatial extent. Our results showed that, due to intense deposit feeding, Scrobicularia plana quickly limited microphytobenthos growth and photosynthetic activity, even at low density (<250 ind m-2). In contrast, the negative impact of Hediste diversicolor on microphytobenthos development due to direct consumption was very low. Thereby, the stimulation of nutrient fluxes at the sediment-water interface resulting from bioirrigation seems to enhance microphytobenthos growth and photosynthesis.
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Affiliation(s)
- Jérôme Morelle
- Univ. Normandie, Univ. Caen Normandie, FRE 2030 BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UCBN, UA, Caen, France.
| | - Olivier Maire
- Univ. Bordeaux, UMR 5805, EPOC UMR, OASU, Arcachon, France
| | - Anaïs Richard
- Univ. Bordeaux, UMR 5805, EPOC UMR, OASU, Arcachon, France
| | - Alex Slimani
- Univ. Normandie, Univ. Caen Normandie, FRE 2030 BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UCBN, UA, Caen, France
| | - Francis Orvain
- Univ. Normandie, Univ. Caen Normandie, FRE 2030 BOREA, CNRS-7208, IRD-207, MNHN, UPMC, UCBN, UA, Caen, France
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van der Heijden LH, Graeve M, Asmus R, Rzeznik-Orignac J, Niquil N, Bernier Q, Guillou G, Asmus H, Lebreton B. Trophic importance of microphytobenthos and bacteria to meiofauna in soft-bottom intertidal habitats: A combined trophic marker approach. MARINE ENVIRONMENTAL RESEARCH 2019; 149:50-66. [PMID: 31153060 DOI: 10.1016/j.marenvres.2019.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 04/22/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
Meiofauna can play an important role in the carbon fluxes of soft-bottom coastal habitats. Investigation of their feeding behavior and trophic position remains challenging due to their small size. In this study, we determine and compare the food sources used by nematodes and benthic copepods by using stable isotope compositions, fatty acid profiles and compound specific isotope analyses of fatty acids in the mudflats, seagrass beds and a sandflat of the Marennes-Oléron Bay, France, and the Sylt-Rømø Bight, Germany. Suspended particulate organic matter was much more 13C-depleted than other food sources and meiofauna, highlighting its poor role in the different studied habitats. The very low proportions of vascular plant fatty acid markers in meiofauna demonstrated that these consumers did not rely on this food source, either fresh or detrital, even in seagrass beds. The combined use of stable isotopes and fatty acids emphasized microphytobenthos and benthic bacteria as the major food sources of nematodes and benthic copepods. Compound specific analyses of a bacteria marker confirmed that bacteria mostly used microphytobenthos as a substrate.
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Affiliation(s)
- L H van der Heijden
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France; Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany.
| | - M Graeve
- Alfred Wegener Institut Helmholtz Centre for Polar- and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany
| | - R Asmus
- Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany
| | - J Rzeznik-Orignac
- UMR 8222 Laboratoire d'Ecogéochimie des Environnements Benthiques, (CNRS - Sorbonne Université), Observatoire Océanologique de Banyuls, 1 avenue Pierre Fabre, 66650, Banyuls-sur-Mer, France
| | - N Niquil
- UMR 7208 Unité Biologie des Organismes et Ecosystèmes Aquatiques (MNHN - CNRS - IRD - Sorbonne Université - Université de Caen Normandie - Université des Antilles), Esplanade de la Paix, 14000, CAEN, France
| | - Q Bernier
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - G Guillou
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
| | - H Asmus
- Alfred Wegener Institute Helmholtz Centre for Polar- and Marine Research, Wattenmeerstation Sylt, Hafenstraße 43, 25992, List, Sylt, Germany
| | - B Lebreton
- UMR 7266 Littoral, Environment et Societies (CNRS - University of La Rochelle), Institute du littoral et de l'environnement, 2 rue Olympe de Gouges, 17000, La Rochelle, France
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Borrett SR, Sheble L, Moody J, Anway EC. Bibliometric review of ecological network analysis: 2010–2016. Ecol Modell 2018. [DOI: 10.1016/j.ecolmodel.2018.04.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Pezy JP, Raoux A, Marmin S, Balay P, Niquil N, Dauvin JC. Before-After analysis of the trophic network of an experimental dumping site in the eastern part of the Bay of Seine (English Channel). MARINE POLLUTION BULLETIN 2017; 118:101-111. [PMID: 28233526 DOI: 10.1016/j.marpolbul.2017.02.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/14/2017] [Accepted: 02/15/2017] [Indexed: 06/06/2023]
Abstract
An experimental study was conducted to assess the physical and biological impacts of muddy fine sand dredged material dumped on a medium sand site Machu offshore the Seine Estuary. Complementary trophic web modelling tools were applied to the Machu ecosystem to analyse the effects of dumping operations. Results show that, after the dumping operations, the biomass of fish increased while invertebrate biomass remained relatively stable through time. Nevertheless, the biomasses of benthic invertebrates, omnivores/scavengers and predators showed some increases, while non-selective deposit feeders and filter feeders decreased. At the ecosystem level, results show that the total ecosystem activity, the ascendency and the overall omnivorous character of the food-web structure increased after dumping operations, whereas recycling subsequently decreased. Finally, the fine and medium sand habitat offshore from the Seine estuary, which undergoes regular natural physical perturbations, shows a high resilience after a short dumping phase.
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Affiliation(s)
- Jean-Philippe Pezy
- Normandie Univ., UNICAEN, UNIROUEN, CNRS UMR 6143 M2C, Laboratoire Morphodynamique Continentale et Côtière, 24 rue des Tilleuls, 14000 Caen, France.
| | - Aurore Raoux
- Normandie Univ., UNICAEN, UNIROUEN, CNRS UMR 6143 M2C, Laboratoire Morphodynamique Continentale et Côtière, 24 rue des Tilleuls, 14000 Caen, France; Normandie Univ., UNICAEN, UMR BOREA (MNHN, UPMC, CNRS-7208, IRD-207), Esplanade de la Paix, 14032 Caen CEDEX 5, France
| | - Stella Marmin
- Normandie Univ., UNICAEN, UNIROUEN, CNRS UMR 6143 M2C, Laboratoire Morphodynamique Continentale et Côtière, 24 rue des Tilleuls, 14000 Caen, France
| | - Pierre Balay
- Cellule de Suivi du Littoral Normand, CSLN, 53 Rue de Prony, 76600 Le Havre, France
| | - Nathalie Niquil
- Normandie Univ., UNICAEN, UMR BOREA (MNHN, UPMC, CNRS-7208, IRD-207), Esplanade de la Paix, 14032 Caen CEDEX 5, France
| | - Jean-Claude Dauvin
- Normandie Univ., UNICAEN, UNIROUEN, CNRS UMR 6143 M2C, Laboratoire Morphodynamique Continentale et Côtière, 24 rue des Tilleuls, 14000 Caen, France
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Horn S, de la Vega C, Asmus R, Schwemmer P, Enners L, Garthe S, Binder K, Asmus H. Interaction between birds and macrofauna within food webs of six intertidal habitats of the Wadden Sea. PLoS One 2017; 12:e0176381. [PMID: 28489869 PMCID: PMC5425016 DOI: 10.1371/journal.pone.0176381] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 04/09/2017] [Indexed: 11/20/2022] Open
Abstract
The determination of food web structures using Ecological Network Analysis (ENA) is a helpful tool to get insight into complex ecosystem processes. The intertidal area of the Wadden Sea is structured into diverse habitat types which differ in their ecological functioning. In the present study, six different intertidal habitats (i.e. cockle field, razor clam field, mud flat, mussel bank, sand flat and seagrass meadow) were analyzed using ENA to determine similarities and characteristic differences in the food web structure of the systems. All six systems were well balanced between their degree of organization and their robustness. However, they differed in their detailed features. The cockle field and the mussel bank exhibited a strong dependency on external imports. The razor clam field appeared to be a rather small system with low energy transfer. In the mud flat microphytobenthos was used as a main food source and the system appeared to be sensitive to perturbations. Bird predation was the most pronounced in the sand flat and the seagrass meadow and led to an increase in energy transfer and parallel trophic cycles in these habitats. Habitat diversity appears to be an important trait for the Wadden Sea as each subsystem seems to have a specific role in the overall functioning of the entire ecosystem.
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Affiliation(s)
- Sabine Horn
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, WaddenSea Station Sylt, List/ Sylt, Germany
| | - Camille de la Vega
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, WaddenSea Station Sylt, List/ Sylt, Germany
| | - Ragnhild Asmus
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, WaddenSea Station Sylt, List/ Sylt, Germany
| | - Philipp Schwemmer
- Research and Technology Centre (FTZ), University of Kiel, Büsum, Germany
| | - Leonie Enners
- Research and Technology Centre (FTZ), University of Kiel, Büsum, Germany
| | - Stefan Garthe
- Research and Technology Centre (FTZ), University of Kiel, Büsum, Germany
| | - Kirsten Binder
- State Agency for Agriculture, Environment and Rural Areas Schleswig-Holstein, Flintbek, Germany
| | - Harald Asmus
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, WaddenSea Station Sylt, List/ Sylt, Germany
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Montanié H, De Crignis MG, Lavaud J. Viral Impact on Prokaryotic and Microalgal Activities in the Microphytobenthic Biofilm of an Intertidal Mudflat (French Atlantic Coast). Front Microbiol 2015; 6:1214. [PMID: 26617575 PMCID: PMC4639598 DOI: 10.3389/fmicb.2015.01214] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 10/19/2015] [Indexed: 01/20/2023] Open
Abstract
This is the first report on viriobenthos activity within the microbial biofilm located at the top-surface of the intertidal mudflat during emersion in Marennes-Oléron Bay (France). By combining in situ and ex situ approaches, the viral production (VP) was linked to the dynamics of prokaryotes and microphytobenthos (MPB). VP averaged 2–4 × 108 viruses ml−1 h−1. VP correlated positively with the Virus to Prokaryote Ratio, and both were correlated negatively with the water content. The virus-induced mortality of prokaryotes was lower in winter than in summer (6.8 vs. 39.7% of the production) and the C-shunting may supply 2–12% of their Carbon Demand, respectively. VP accounted for 79% of loss in Prokaryotes but the response was delayed compared to the increase in VP suggesting a simultaneous release of viruses of MPB origin. This hypothesis is supported by capsid-sizing of virions by transmission electronic microscopy and bioassays. Harvesting and ex situ maintenance of top-surface sediments was carried out to monitor the dynamics of viruses, prokaryotes and MPB after inoculation with benthic or planktonic viruses. Benthic viruses modified the prokaryotic and MPB dynamics and decreased the photosynthesis efficiency in contrast to planktonic viruses that impacted MPB but not the prokaryotes.
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Affiliation(s)
- Hélène Montanié
- UMRi 7266 ULR- Centre National de la Recherche Scientifique, LIENSs, Institut du Littoral et de l'Environnement, Université de La Rochelle La Rochelle, France
| | - Margot G De Crignis
- UMRi 7266 ULR- Centre National de la Recherche Scientifique, LIENSs, Institut du Littoral et de l'Environnement, Université de La Rochelle La Rochelle, France
| | - Johann Lavaud
- UMRi 7266 ULR- Centre National de la Recherche Scientifique, LIENSs, Institut du Littoral et de l'Environnement, Université de La Rochelle La Rochelle, France
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Bolam SG. Macrofaunal recovery following the intertidal recharge of dredged material: a comparison of structural and functional approaches. MARINE ENVIRONMENTAL RESEARCH 2014; 97:15-29. [PMID: 24534437 DOI: 10.1016/j.marenvres.2014.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 01/22/2014] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
There is a growing need to understand the functional implications of anthropogenic pressures, such as those following coastal disposal of dredged material. Current assessments, based on taxonomic structure of benthic organisms, only provide a limited capacity to determine functional impacts or recovery. This study assesses recovery of two intertidal dredged material recharge schemes, comparing results obtained based on taxonomic structure (univariate and multivariate approaches) and function (biological trait composition, functional diversity, secondary production) of the benthic assemblages. The assemblages recolonising both schemes were consistently less speciose, less densely-populated and exhibited multivariate community structures that differed from those of the reference areas. However, for both schemes metrics of functionality converged to those of reference areas, although some differences in trait composition persisted for up to 3 years. These data support the proposition that impacts of, and recovery from, anthropogenic disturbance should be assessed using a combination of both functional and taxonomic structural approaches.
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Affiliation(s)
- S G Bolam
- Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK.
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