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Akian DD, Yao K, Parmentier E, Joassard L, Clota F, Baroiller JF, Lozano P, Chatain B, Bégout ML. Acoustic signals produced by Nile tilapia Oreochromis niloticus and black-chinned tilapia Sarotherodon melanotheron during intra- and interspecific pairings. ZOOLOGY 2020; 143:125831. [PMID: 32949976 DOI: 10.1016/j.zool.2020.125831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 07/20/2020] [Accepted: 07/27/2020] [Indexed: 11/18/2022]
Abstract
We characterised, for the first-time, the sound production of black-chinned tilapia Sarotherodon melanotheron and show differences with that of Nile tilapia Oreochromis niloticus in a hybridization pairing context. Although both species were able to produce drum sounds, they showed different acoustic features. Drum sounds were produced in aggressive (chasing or lateral attack) and non-aggressive (courtship) contexts by O. niloticus but only in aggressive situations (fleeing or avoidance) by S. melanotheron. The second type of sounds produced by O. niloticus were grunts, produced in both aggressive (chasing and after biting) and non-aggressive contexts (nest building). The second type of sound produced by S. melanotheron was a rolling sound, produced only during courtship. Each species was able to produce common sounds (drum) and species-specific sounds (grunts and rolling). This implies that species can communicate without being able to understand each other because the sounds emitted may probably have different significance. Drumming corresponded only to aggressivity in S. melanotheron, whereas this was not true for O. niloticus. 11-ketotestosterone (11-kt) levels were significantly higher in male O. niloticus than male S. melanotheron, but there was no significant correlation between 11-kt or estradiol concentrations and the number of sounds produced in aggressive or non-aggressive behavioural contexts in either species. During interspecies interactions, O. niloticus drum sounds are likely considered to be aggressive by S. melanotheron and could potentially constitute a reproductive barrier between the two species.
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Affiliation(s)
- Dieudonné Djétouan Akian
- Département Eaux, Forêts et Environnement, Institut National Polytechnique Félix Houphouët Boigny, BP 1313, Yamoussoukro, Cote d'Ivoire; Laboratoire de Biologie et Cytologie Animales, Unité de Formation et de Recherche Science de la Nature, Université Nangui-Abrogoua, 02 BP 801, Abidjan 02, Cote d'Ivoire; Laboratoire Ressources Halieutiques, Institut Français de Recherche pour l'Exploitation de la Mer, L'Houmeau, 17137, France
| | - Kouakou Yao
- Laboratoire de Biologie et Cytologie Animales, Unité de Formation et de Recherche Science de la Nature, Université Nangui-Abrogoua, 02 BP 801, Abidjan 02, Cote d'Ivoire
| | - Eric Parmentier
- Laboratoire de Morphologie Fonctionnelle et Evolutive, AFFISH, Institut de chimie- B6C, Université de Liège, Sart Tilman, 4000, Liège, Belgium
| | - Lucette Joassard
- Laboratoire Ressources Halieutiques, Institut Français de Recherche pour l'Exploitation de la Mer, L'Houmeau, 17137, France
| | - Frédéric Clota
- Université Paris-Saclay, INRAE, AgroParisTech, GABI, 78350, Jouy-en-Josas, France
| | - Jean-François Baroiller
- Unité Mixte de Recherche 116, Institut des Sciences de l'Evolution de Montpellier, Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Montpellier, France
| | - Paul Lozano
- Unité Mixte de Recherche 116, Institut des Sciences de l'Evolution de Montpellier, Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Montpellier, France
| | - Béatrice Chatain
- MARBEC, Université Montpellier, CNRS, Ifremer, IRD, Chemin de Maguelone, 34250, Palavas-les-Flots, France
| | - Marie-Laure Bégout
- Laboratoire Ressources Halieutiques, Institut Français de Recherche pour l'Exploitation de la Mer, L'Houmeau, 17137, France; MARBEC, Université Montpellier, CNRS, Ifremer, IRD, Chemin de Maguelone, 34250, Palavas-les-Flots, France.
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Alfonso S, Sadoul B, Gesto M, Joassard L, Chatain B, Geffroy B, Bégout ML. Coping styles in European sea bass: The link between boldness, stress response and neurogenesis. Physiol Behav 2019; 207:76-85. [PMID: 31047951 DOI: 10.1016/j.physbeh.2019.04.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 04/24/2019] [Accepted: 04/24/2019] [Indexed: 12/12/2022]
Abstract
Coping styles consist of a coherent set of individual physiological and behavioral differences in stress responses that are consistent across time and context. Such consistent inter-individual differences in behavior have already been shown in European sea bass (Dicentrarchus labrax), but the associated mechanisms are still poorly understood. Here, we combine physiological measurements with individual behavioral responses in order to characterize coping styles in fish. Fish were tagged and placed in a tank for group risk-taking tests (GRT) at 8 months of age to evaluate boldness using the proxy latency of leaving a sheltered area towards an open area. A subsample of these fish were individually challenged 16 months later using an open field test (OFT), in which the boldness was assessed after being placed in a shelter within an open arena. Latency to exit the shelter, time spent in the shelter, and distance travelled were recorded for this purpose. The blood and brain were then collected to evaluate plasma cortisol concentration and neurotransmitter levels (dopamine, norepinephrine, serotonin, and related metabolites), as well as brain transcription of key genes involved in stress axis regulation (gr1, gr2, mr, crf), neurogenesis (neurod1, neurod2, pcna), and neuronal development (egr1). Fish acting bolder in the GRT were not necessarily those acting bolder in the OFT, highlighting the relatively low consistency across different types of tests performed with a 16-months interval. There was, however, a significant correlation between stress markers and boldness. Indeed, mRNA levels of mr, crf, gr2, egr1, and neurod2, as well as norepinephrine levels were higher in shy than bold fish, whereas brain serotonergic activity was lower in shy fish. Overall, our study highlights the fact that boldness was not consistent over time when testing context differed (group vs. alone). This is in agreement with previous literature suggesting that social context play a key role in boldness measurement and that the particular life history of each individual may account in shaping the personality fate of a fish.
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Affiliation(s)
- Sébastien Alfonso
- MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Palavas-les-flots, France; Laboratoire Ressources Halieutiques, Ifremer, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Bastien Sadoul
- MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Palavas-les-flots, France
| | - Manuel Gesto
- Technical University of Denmark, Willemoesvej 2 Building Hovedbygning, D-9850 Hirtshals, Denmark
| | - Lucette Joassard
- Laboratoire Ressources Halieutiques, Ifremer, Place Gaby Coll, F-17137 L'Houmeau, France
| | - Béatrice Chatain
- MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Palavas-les-flots, France
| | - Benjamin Geffroy
- MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Palavas-les-flots, France
| | - Marie-Laure Bégout
- Laboratoire Ressources Halieutiques, Ifremer, Place Gaby Coll, F-17137 L'Houmeau, France
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Alfonso S, Blanc M, Joassard L, Keiter SH, Munschy C, Loizeau V, Bégout ML, Cousin X. Examining multi- and transgenerational behavioral and molecular alterations resulting from parental exposure to an environmental PCB and PBDE mixture. Aquat Toxicol 2019; 208:29-38. [PMID: 30605867 DOI: 10.1016/j.aquatox.2018.12.021] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 12/20/2018] [Accepted: 12/27/2018] [Indexed: 06/09/2023]
Abstract
Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants extensively used during the 20th century and still present in aquatic environments despite their ban. Effects of exposure to these compounds over generations are poorly documented. Therefore, our aims were to characterize behavioral responses and underlying molecular mechanisms in zebrafish exposed to an environmentally relevant mixture of PCBs and PBDEs as well as in four unexposed offspring generations. Zebrafish (F0) were chronically exposed from the first meal onward to a diet spiked with a mixture containing 22 PCB and 7 PBDE congeners in proportions and concentrations reflecting environmental situations (ΣPCBs = 1991 and ΣPBDEs = 411 ng/g). Four offspring generations (F1 to F4) were obtained from this F0 and were not further exposed. Behavior was assessed at both larval and adult stages. Mechanisms related to behavioral defects (habenula maturation and c-fos transcription) and methylation (dnmts transcription) were monitored in larvae. Exposed adult F0 as well as F1 and F3 adults displayed no behavioral change while F2 expressed anxiety-like behavior. Larval behavior was also disrupted, i.e. hyperactive after light to dark transition in F1 or hypoactive in F2, F3 and F4. Behavioral disruptions may be related to defect in habenula maturation (observed in F1) and change in c-fos transcription (observed in F1 and F2). Transcription of the gene encoding DNA methyltransferase (dnmt3ba) was also modified in all generations. Our results lead us to hypothesize that chronic dietary exposure to an environmentally relevant mixture of PCB and PBDE triggers multigenerational and transgenerational molecular and behavioral disruptions in a vertebrate model.
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Affiliation(s)
- Sébastien Alfonso
- Ifremer, Laboratoire Ressources Halieutiques, Place Gaby Coll, F-17137, L'Houmeau, France; UMR MARBEC, Ifremer, IRD, UM2, CNRS, Laboratoire Adaptation et Adaptabilités des Animaux et des Systèmes, Route de Maguelone, F-34250, Palavas-les-Flots, France.
| | - Mélanie Blanc
- Ifremer, Laboratoire Ressources Halieutiques, Place Gaby Coll, F-17137, L'Houmeau, France; Man-Technology-Environment Research Centre (MTM), School of Science and Technology, Örebro University, Fakultetsgatan 1, S-701 82, Örebro, Sweden
| | - Lucette Joassard
- Ifremer, Laboratoire Ressources Halieutiques, Place Gaby Coll, F-17137, L'Houmeau, France
| | - Steffen H Keiter
- Man-Technology-Environment Research Centre (MTM), School of Science and Technology, Örebro University, Fakultetsgatan 1, S-701 82, Örebro, Sweden
| | - Catherine Munschy
- Ifremer, Laboratoire Biogéochimie des Contaminants Organiques, Rue de l'Ile d'Yeu, BP 21105, F-44311, Nantes, Cedex 3, France
| | - Véronique Loizeau
- Ifremer, Laboratoire Biogéochimie des Contaminants Organiques, ZI Pointe du Diable, CS 10070, F-29280, Plouzané, France
| | - Marie-Laure Bégout
- Ifremer, Laboratoire Ressources Halieutiques, Place Gaby Coll, F-17137, L'Houmeau, France
| | - Xavier Cousin
- UMR MARBEC, Ifremer, IRD, UM2, CNRS, Laboratoire Adaptation et Adaptabilités des Animaux et des Systèmes, Route de Maguelone, F-34250, Palavas-les-Flots, France; Inra, UMR GABI, Inra, AgroParisTech, Domaine de Vilvert, Batiment 231, F-78350 Jouy-en-Josas, France
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Vignet C, Larcher T, Davail B, Joassard L, Le Menach K, Guionnet T, Lyphout L, Ledevin M, Goubeau M, Budzinski H, Bégout ML, Cousin X. Fish Reproduction Is Disrupted upon Lifelong Exposure to Environmental PAHs Fractions Revealing Different Modes of Action. Toxics 2016; 4:toxics4040026. [PMID: 29051429 PMCID: PMC5606653 DOI: 10.3390/toxics4040026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 10/17/2016] [Accepted: 10/19/2016] [Indexed: 11/20/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) constitute a large family of organic pollutants emitted in the environment as complex mixtures, the compositions of which depend on origin. Among a wide range of physiological defects, PAHs are suspected to be involved in disruption of reproduction. In an aquatic environment, the trophic route is an important source of chronic exposure to PAHs. Here, we performed trophic exposure of zebrafish to three fractions of different origin, one pyrolytic and two petrogenic. Produced diets contained PAHs at environmental concentrations. Reproductive traits were analyzed at individual, tissue and molecular levels. Reproductive success and cumulative eggs number were disrupted after exposure to all three fractions, albeit to various extents depending on the fraction and concentrations. Histological analyses revealed ovary maturation defects after exposure to all three fractions as well as degeneration after exposure to a pyrolytic fraction. In testis, hypoplasia was observed after exposure to petrogenic fractions. Genes expression analysis in gonads has allowed us to establish common pathways such as endocrine disruption or differentiation/maturation defects. Taken altogether, these results indicate that PAHs can indeed disrupt fish reproduction and that different fractions trigger different pathways resulting in different effects.
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Affiliation(s)
- Caroline Vignet
- Ifremer, Ecotoxicology Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Thibaut Larcher
- INRA UMR703, APEX, Oniris, F-44307 Nantes, France.
- Oniris, École Nationale vétérinaire, Agro-Alimentaire et de L'alimentation Nantes-Atlantique, LUNAM Université, F-44307 Nantes, France.
| | - Blandine Davail
- Department of Science and Technology, University of Bordeaux 1, EPOC, UMR CNRS 5805, F-33405 Talence, France.
| | - Lucette Joassard
- Ifremer, Fisheries Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Karyn Le Menach
- Department of Science and Technology, University of Bordeaux 1, EPOC, UMR CNRS 5805, F-33405 Talence, France.
| | - Tiphaine Guionnet
- Ifremer, Fisheries Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Laura Lyphout
- Ifremer, Ecotoxicology Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
- Ifremer, Fisheries Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Mireille Ledevin
- INRA UMR703, APEX, Oniris, F-44307 Nantes, France.
- Oniris, École Nationale vétérinaire, Agro-Alimentaire et de L'alimentation Nantes-Atlantique, LUNAM Université, F-44307 Nantes, France.
| | - Manon Goubeau
- Ifremer, Ecotoxicology Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Hélène Budzinski
- Department of Science and Technology, University of Bordeaux 1, EPOC, UMR CNRS 5805, F-33405 Talence, France.
| | - Marie-Laure Bégout
- Ifremer, Fisheries Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
| | - Xavier Cousin
- Ifremer, Ecotoxicology Laboratory, Place Gaby Coll, F-17137 L'Houmeau, France.
- INRA LPGP, Campus de Beaulieu, F-35042 Rennes, France.
- Ifremer, Laboratoire Adaptation et Adaptabilité des Animaux et des Systèmes, UMR MARBEC, Route de Maguelone, F-34250 Palavas les Flots, France.
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Vignet C, Joassard L, Lyphout L, Guionnet T, Goubeau M, Le Menach K, Brion F, Kah O, Chung BC, Budzinski H, Bégout ML, Cousin X. Exposures of zebrafish through diet to three environmentally relevant mixtures of PAHs produce behavioral disruptions in unexposed F1 and F2 descendant. Environ Sci Pollut Res Int 2015; 22:16371-16383. [PMID: 25639250 DOI: 10.1007/s11356-015-4157-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Accepted: 01/20/2015] [Indexed: 06/04/2023]
Abstract
The release of polycyclic aromatic hydrocarbons (PAHs) into the environment has increased very substantially over the last decades. PAHs are hydrophobic molecules which can accumulate in high concentrations in sediments acting then as major secondary sources. Fish contamination can occur through contact or residence nearby sediments or though dietary exposure. In this study, we analyzed certain physiological traits in unexposed fish (F1) issued from parents (F0) exposed through diet to three PAH mixtures at similar and environmentally relevant concentrations but differing in their compositions. For each mixture, no morphological differences were observed between concentrations. An increase in locomotor activity was observed in larvae issued from fish exposed to the highest concentration of a pyrolytic (PY) mixture. On the contrary, a decrease in locomotor activity was observed in larvae issued from heavy oil mixture (HO). In the case of the third mixture, light oil (LO), a reduction of the diurnal activity was observed during the setup of larval activity. Behavioral disruptions persisted in F1-PY juveniles and in their offspring (F2). Endocrine disruption was analyzed using cyp19a1b:GFP transgenic line and revealed disruptions in PY and LO offspring. Since no PAH metabolites were dosed in larvae, these findings suggest possible underlying mechanisms such as altered parental signaling molecule and/or hormone transferred in the gametes, eventually leading to early imprinting. Taken together, these results indicate that physiological disruptions are observed in offspring of fish exposed to PAH mixtures through diet.
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Affiliation(s)
- Caroline Vignet
- Ecotoxicology Laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Lucette Joassard
- Fisheries laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Laura Lyphout
- Fisheries laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Tiphaine Guionnet
- Fisheries laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Manon Goubeau
- Ecotoxicology Laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Karyn Le Menach
- University of Bordeaux 1, EPOC, UMR CNRS 5805, 33405, Talence, France
| | - François Brion
- Unité d'Ecotoxicologie in vitro et in vivo, Direction des Risques Chroniques, INERIS, 60550, Verneuil-en-Halatte, France
| | - Olivier Kah
- INSERM U1085, Research Institute in Health, Environment and Occupation, Team NEED, Case 1302Université de Rennes 1 Campus de Beaulieu, 35 042, Rennes cedex, France
| | - Bon-Chu Chung
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Hélène Budzinski
- University of Bordeaux 1, EPOC, UMR CNRS 5805, 33405, Talence, France
| | - Marie-Laure Bégout
- Fisheries laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France
| | - Xavier Cousin
- Ecotoxicology Laboratory, Ifremer, Place Gaby Coll, BP7, 17137, L'Houmeau, France.
- INRA LPGP, Campus de Beaulieu, 35042, Rennes, France.
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Ramanoudjame L, Rocancourt C, Lainé J, Klein A, Joassard L, Gartioux C, Fleury M, Lyphout L, Kabashi E, Ciura S, Cousin X, Allamand V. Two novel COLVI long chains in zebrafish that are essential for muscle development. Hum Mol Genet 2015; 24:6624-39. [PMID: 26362255 DOI: 10.1093/hmg/ddv368] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 09/04/2015] [Indexed: 12/25/2022] Open
Abstract
Collagen VI (COLVI), a protein ubiquitously expressed in connective tissues, is crucial for structural integrity, cellular adhesion, migration and survival. Six different genes are recognized in mammalians, encoding six COLVI-chains that assemble as two 'short' (α1, α2) and one 'long' chain (theoretically any one of α3-6). In humans, defects in the most widely expressed heterotrimer (α123), due to mutations in the COL6A1-3 genes, cause a heterogeneous group of neuromuscular disorders, collectively termed COLVI-related muscle disorders. Little is known about the function(s) of the recently described α4-6 chains and no mutations have been detected yet. In this study, we characterized two novel COLVI long chains in zebrafish that are most homologous to the mammalian α4 chain; therefore, we named the corresponding genes col6a4a and col6a4b. These orthologues represent ancestors of the mammalian Col6a4-6 genes. By in situ hybridization and RT-qPCR, we unveiled a distinctive expression kinetics for col6a4b, compared with the other col6a genes. Using morpholino antisense oligonucleotides targeting col6a4a, col6a4b and col6a2, we modelled partial and complete COLVI deficiency, respectively. All morphant embryos presented altered muscle structure and impaired motility. While apoptosis was not drastically increased, autophagy induction was defective in all morphants. Furthermore, motoneuron axon growth was abnormal in these morphants. Importantly, some phenotypical differences emerged between col6a4a and col6a4b morphants, suggesting only partial functional redundancy. Overall, our results further confirm the importance of COLVI in zebrafish muscle development and may provide important clues for potential human phenotypes associated with deficiency of the recently described COLVI-chains.
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Affiliation(s)
- Laetitia Ramanoudjame
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France
| | | | - Jeanne Lainé
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France, Département de Physiologie, Sorbonne Universités UPMC Paris 06, Site Pitié-Salpêtrière, Paris F-75013, France
| | - Arnaud Klein
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France
| | | | - Corine Gartioux
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France
| | - Marjory Fleury
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France
| | - Laura Lyphout
- Fish Ecophysiology Group, Ifremer, L'Houmeau F-17137, France
| | - Edor Kabashi
- Sorbonne Universités Paris VI, UMR CNRS 1127 UPMC, INSERM U 1127, CNRS UMR 7225, Institut du Cerveau et de la Moelle épinière-ICM, Paris, France and
| | - Sorana Ciura
- Sorbonne Universités Paris VI, UMR CNRS 1127 UPMC, INSERM U 1127, CNRS UMR 7225, Institut du Cerveau et de la Moelle épinière-ICM, Paris, France and
| | - Xavier Cousin
- Fish Ecophysiology Group, Ifremer, L'Houmeau F-17137, France, INRA LPGP, Campus de Beaulieu, Rennes F-35042, France
| | - Valérie Allamand
- Sorbonne Universités, UPMC Univ Paris 06, INSERM UMRS974, CNRS FRE3617, Center for Research in Myology, Paris F-75013, France, Institut de Myologie, Paris F-75013, France,
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Laima M, Brossard D, Sauriau PG, Girard M, Richard P, Gouleau D, Joassard L. The influence of long emersion on biota, ammonium fluxes and nitrification in intertidal sediments of Marennes-Oléron Bay, France. Mar Environ Res 2002; 53:381-402. [PMID: 11991209 DOI: 10.1016/s0141-1136(01)00126-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A comparative study between waterlogged and reflooded intertidal sediments was undertaken in March and June 1999 through statistical analysis of selected sediment parameters (biota, salinity, O2, Eh), pool sizes and benthic fluxes of nutrients (NH4+, NO2-, NO3-) and nitrification rates. In March samples, absence of polychaetes and oligochaetes from upper sediment horizons were due to erosional events sweeping away surface sediments. Presence of richer annelid assemblages in June samples indicated more stable hydrodynamic conditions that favoured the development of benthic microalgae biofilms. Dewatering of sediments during a 3-day emersion period promoted a salinity rise on top layers, migration of pore water ions towards the sediment surface, and created sediment fissures that accelerated water exchange on reflooding. Reflooded and waterlogged sediment systems were comparable with respect to the release of NH4+ to overlying water but were different with respect to nitrification rates. Sediment-water NH4+ fluxes were higher (P = 0.011) in March (3.3 mmol m(-2) day(-1) compared to June (1.4 mmol m(-2) day(-1) due to higher macrofauna biomasses and lower benthic microalgae concentrations in March samples. Potential nitrification rates (range from 19 to 60 mmol NO3- (-2) day(-1)) were not statistically different between March and June. A thinner oxic layer in reflooded compared with waterlogged systems reflects a decrease of O2 diffusion into sediment at high salinities which resulted in the fall of the actual nitrification rates (P < 0.05). Our data suggest that long term dessication of intertidal sediments may depress the nitrification process at the ecosystem level.
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Affiliation(s)
- M Laima
- CREMA, UMR 10, CNR-IFREMER, L'Houmeau, France.
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