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Monserrat M, Comeau S, Verdura J, Alliouane S, Spennato G, Priouzeau F, Romero G, Mangialajo L. Climate change and species facilitation affect the recruitment of macroalgal marine forests. Sci Rep 2022; 12:18103. [PMID: 36302874 PMCID: PMC9613703 DOI: 10.1038/s41598-022-22845-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 10/20/2022] [Indexed: 12/30/2022] Open
Abstract
Marine forests are shrinking globally due to several anthropogenic impacts including climate change. Forest-forming macroalgae, such as Cystoseira s.l. species, can be particularly sensitive to environmental conditions (e.g. temperature increase, pollution or sedimentation), especially during early life stages. However, not much is known about their response to the interactive effects of ocean warming (OW) and acidification (OA). These drivers can also affect the performance and survival of crustose coralline algae, which are associated understory species likely playing a role in the recruitment of later successional species such as forest-forming macroalgae. We tested the interactive effects of elevated temperature, low pH and species facilitation on the recruitment of Cystoseira compressa. We demonstrate that the interactive effects of OW and OA negatively affect the recruitment of C. compressa and its associated coralline algae Neogoniolithon brassica-florida. The density of recruits was lower under the combinations OW and OA, while the size was negatively affected by the temperature increase but positively affected by the low pH. The results from this study show that the interactive effects of climate change and the presence of crustose coralline algae can have a negative impact on the recruitment of Cystoseira s.l. species. While new restoration techniques recently opened the door to marine forest restoration, our results show that the interactions of multiple drivers and species interactions have to be considered to achieve long-term population sustainability.
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Affiliation(s)
- Margalida Monserrat
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France ,grid.4444.00000 0001 2112 9282Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, Villefranche-sur-Mer, France
| | - Steeve Comeau
- grid.4444.00000 0001 2112 9282Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, Villefranche-sur-Mer, France
| | - Jana Verdura
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France
| | - Samir Alliouane
- grid.4444.00000 0001 2112 9282Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, Villefranche-sur-Mer, France
| | - Guillaume Spennato
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France
| | - Fabrice Priouzeau
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France
| | - Gilbers Romero
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France
| | - Luisa Mangialajo
- grid.4444.00000 0001 2112 9282Université Côte d’Azur, CNRS, ECOSEAS, Nice, France
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Di Franco E, Pierson P, Di Iorio L, Calò A, Cottalorda JM, Derijard B, Di Franco A, Galvé A, Guibbolini M, Lebrun J, Micheli F, Priouzeau F, Risso-de Faverney C, Rossi F, Sabourault C, Spennato G, Verrando P, Guidetti P. Effects of marine noise pollution on Mediterranean fishes and invertebrates: A review. Mar Pollut Bull 2020; 159:111450. [PMID: 32892911 DOI: 10.1016/j.marpolbul.2020.111450] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [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: 03/23/2020] [Revised: 07/06/2020] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
Marine noise pollution (MNP) can cause a multitude of impacts on many organisms, but information is often scattered and general outcomes difficult to assess. We have reviewed the literature on MNP impacts on Mediterranean fish and invertebrates. Both chronic and acute MNP produced by various human activities - e.g. maritime traffic, pile driving, air guns - were found to cause detectable effects on intra-specific communication, vital processes, physiology, behavioral patterns, health status and survival. These effects on individuals can extend to inducing population- and ecosystem-wide alterations, especially when MNP impacts functionally important species, such as keystone predators and habitat forming species. Curbing the threats of MNP in the Mediterranean Sea is a challenging task, but a variety of measures could be adopted to mitigate MNP impacts. Successful measures will require more accurate information on impacts and that effective management of MNP really becomes a priority in the policy makers' agenda.
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Affiliation(s)
- E Di Franco
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France.
| | - P Pierson
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - L Di Iorio
- CHORUS Institute, Phelma Minatec, 38016 Grenoble, France; Foundation of the Grenoble Institute of Technology, 38031 Grenoble, France
| | - A Calò
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; Dipartimento di Scienze della Terra e del Mare (DiSTeM), Università di Palermo, Via Archirafi 20-22, 90123 Palermo, Italy
| | - J M Cottalorda
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - B Derijard
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - A Di Franco
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; Department of Integrative Marine Ecology, Sicily, Stazione Zoologica Anton Dohrn, Lungomare Cristoforo Colombo (complesso Roosevelt), 90149 Palermo, Italy
| | - A Galvé
- Université Côte d'Azur, CNRS, IRD, Observatoire de la Côte d'Azur, Géoazur, Sophia-Antipolis, France
| | - M Guibbolini
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - J Lebrun
- Université Côte d'Azur, CNRS, UMR 7271 I3S, Sophia Antipolis, France
| | - F Micheli
- Hopkins Marine Station and Stanford Center for Ocean Solutions, Stanford University, Pacific Grove, CA 93950, USA
| | - F Priouzeau
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | | | - F Rossi
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - C Sabourault
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - G Spennato
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France
| | - P Verrando
- Université Côte d'Azur, CNRS, INSERM, Institut de Biologie Valrose (iBV, INSERM U1091 - CNRS UMR7277), Nice, France
| | - P Guidetti
- Université Côte d'Azur, CNRS, UMR 7035 ECOSEAS, Nice, France; CoNISMa (National Interuniversitary Consortium of Marine Sciences), P.le Flaminio 9, 00196 Rome, Italy; Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn - National Institute of Marine Biology, Ecology and Biotechnology, Villa Comunale, 80121 Naples, Italy
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3
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Dani V, Priouzeau F, Mertz M, Mondin M, Pagnotta S, Lacas-Gervais S, Davy SK, Sabourault C. Expression patterns of sterol transporters NPC1 and NPC2 in the cnidarian-dinoflagellate symbiosis. Cell Microbiol 2017; 19. [DOI: 10.1111/cmi.12753] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 05/16/2017] [Accepted: 05/18/2017] [Indexed: 12/13/2022]
Affiliation(s)
- Vincent Dani
- Institut de Biologie Valrose (iBV); Université Côte d'Azur; Nice France
- UMR7138, Equipe Symbiose Marine; Université Côte d'Azur; Nice France
| | - Fabrice Priouzeau
- Institut de Biologie Valrose (iBV); Université Côte d'Azur; Nice France
- UMR7138, Equipe Symbiose Marine; Université Côte d'Azur; Nice France
| | - Marjolijn Mertz
- Institut de Biologie Valrose (iBV); Université Côte d'Azur; Nice France
| | - Magali Mondin
- Institut de Biologie Valrose (iBV); Université Côte d'Azur; Nice France
| | - Sophie Pagnotta
- Centre Commun de Microscopie Appliquée; Université Côte d'Azur; Nice France
| | | | - Simon K. Davy
- School of Biological Sciences; Victoria University of Wellington; Wellington New Zealand
| | - Cécile Sabourault
- Institut de Biologie Valrose (iBV); Université Côte d'Azur; Nice France
- UMR7138, Equipe Symbiose Marine; Université Côte d'Azur; Nice France
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Villanueva MA, Barnay-Verdier S, Priouzeau F, Furla P. Chloroplast and oxygen evolution changes in Symbiodinium sp. as a response to latrunculin and butanedione monoxime treatments under various light conditions. Photosynth Res 2015; 124:305-313. [PMID: 25904178 DOI: 10.1007/s11120-015-0142-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 04/03/2015] [Indexed: 06/04/2023]
Abstract
The actin cytoskeleton is a dynamic structure that provides an interactive platform for organelles and cellular components. It also serves as track for membranes and vesicles that move via myosin. The actin cytoskeleton of Symbiodinium is a well-organized reticular structure suggestive of multiple membrane interactions, very likely including those of the chloroplast. The Symbiodinium chloroplast membrane network is, in turn, a highly organized structure, suggestive of being under the control of an organizing network. We visualized the chloroplast membranes of cultured Symbiodinium sp. under various light conditions and observed changes dependent on illumination intensity. Since we suspected interaction between these two organelles, and we knew that the Symbiodinium actin cytoskeleton collapses upon treatment with either latrunculin B, an actin microfilament-disrupting agent, or butanedione monoxime, a myosin function inhibitor, we tested the Symbiodinium sp. oxygen evolution in their presence. Upon latrunculin B addition, the oxygen production decreased compared to non-treated cells; however, this was not observed after a 24 h latrunculin treatment. On the contrary, butanedione monoxime treatment caused a non-recoverable dysfunction of the chloroplast causing a severe loss in oxygen production even after long-term exposure. Using electron microscopy, we observed an alteration of the Symbiodinium sp. chloroplast distribution after latrunculin B treatment, with respect to untreated cells. Furthermore, a thorough disorganization of the chloroplast grana was observed after butanedione monoxime treatment. These data suggest that an actomyosin system would be important for chloroplast organization and distribution, and critical for normal photosynthetic function of Symbiodinium sp.
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Affiliation(s)
- Marco A Villanueva
- Instituto de Ciencias del Mar y Limnología, Unidad Académica de Sistemas Arrecifales, Universidad Nacional Autónoma de México-UNAM, Prol. Avenida Niños Héroes S/N, 77580, Puerto Morelos, Quintana Roo, México,
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Kopp C, Wisztorski M, Revel J, Mehiri M, Dani V, Capron L, Carette D, Fournier I, Massi L, Mouajjah D, Pagnotta S, Priouzeau F, Salzet M, Meibom A, Sabourault C. MALDI-MS and NanoSIMS imaging techniques to study cnidarian-dinoflagellate symbioses. ZOOLOGY 2014; 118:125-31. [PMID: 25447219 DOI: 10.1016/j.zool.2014.06.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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: 04/01/2014] [Revised: 06/29/2014] [Accepted: 06/30/2014] [Indexed: 12/22/2022]
Abstract
Cnidarian-dinoflagellate photosynthetic symbioses are fundamental to biologically diverse and productive coral reef ecosystems. The hallmark of this symbiotic relationship is the ability of dinoflagellate symbionts to supply their cnidarian host with a wide range of nutrients. Many aspects of this association nevertheless remain poorly characterized, including the exact identity of the transferred metabolic compounds, the mechanisms that control their exchange across the host-symbiont interface, and the precise subcellular fate of the translocated materials in cnidarian tissues. This lack of knowledge is mainly attributed to difficulties in investigating such metabolic interactions both in situ, i.e. on intact symbiotic associations, and at high spatial resolution. To address these issues, we illustrate the application of two in situ and high spatial resolution molecular and ion imaging techniques-matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI-MSI) and the nano-scale secondary-ion mass spectrometry (NanoSIMS) ion microprobe. These imaging techniques provide important new opportunities for the detailed investigation of many aspects of cnidarian-dinoflagellate associations, including the dynamics of cellular interactions.
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Affiliation(s)
- C Kopp
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
| | - M Wisztorski
- PRISM, University of Lille 1, EA 4550 - FRE3637 CNRS, Bat SN3, F-59655 Villeneuve d'Ascq Cedex, France
| | - J Revel
- UMR7138 University of Nice-Sophia Antipolis, CNRS, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France; UMR7138 Sorbonne University Paris 6, CNRS, Institut de Biologie Paris-Seine, 7 quai Saint Bernard, 75005 Paris, France
| | - M Mehiri
- UMR7272 University of Nice-Sophia Antipolis, CNRS, Institut de Chimie de Nice, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France
| | - V Dani
- UMR7138 University of Nice-Sophia Antipolis, CNRS, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France; UMR7138 Sorbonne University Paris 6, CNRS, Institut de Biologie Paris-Seine, 7 quai Saint Bernard, 75005 Paris, France
| | - L Capron
- UMR7272 University of Nice-Sophia Antipolis, CNRS, Institut de Chimie de Nice, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France
| | - D Carette
- CCMA, University of Nice-Sophia Antipolis, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France
| | - I Fournier
- PRISM, University of Lille 1, EA 4550 - FRE3637 CNRS, Bat SN3, F-59655 Villeneuve d'Ascq Cedex, France
| | - L Massi
- UMR7272 University of Nice-Sophia Antipolis, CNRS, Institut de Chimie de Nice, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France
| | - D Mouajjah
- PRISM, University of Lille 1, EA 4550 - FRE3637 CNRS, Bat SN3, F-59655 Villeneuve d'Ascq Cedex, France
| | - S Pagnotta
- CCMA, University of Nice-Sophia Antipolis, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France
| | - F Priouzeau
- UMR7138 University of Nice-Sophia Antipolis, CNRS, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France; UMR7138 Sorbonne University Paris 6, CNRS, Institut de Biologie Paris-Seine, 7 quai Saint Bernard, 75005 Paris, France
| | - M Salzet
- PRISM, University of Lille 1, EA 4550 - FRE3637 CNRS, Bat SN3, F-59655 Villeneuve d'Ascq Cedex, France
| | - A Meibom
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland; Center for Advanced Surface Analysis, Institute of Earth Sciences, University of Lausanne, CH-1015 Lausanne, Switzerland
| | - C Sabourault
- UMR7138 University of Nice-Sophia Antipolis, CNRS, Faculty of Science, 28 Avenue Valrose, BP 71, F-06108 Nice Cedex 2, France; UMR7138 Sorbonne University Paris 6, CNRS, Institut de Biologie Paris-Seine, 7 quai Saint Bernard, 75005 Paris, France.
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6
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Dani V, Ganot P, Priouzeau F, Furla P, Sabourault C. Are Niemann-Pick type C proteins key players in cnidarian-dinoflagellate endosymbioses? Mol Ecol 2014; 23:4527-40. [DOI: 10.1111/mec.12876] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 07/24/2014] [Accepted: 07/25/2014] [Indexed: 01/20/2023]
Affiliation(s)
- Vincent Dani
- UMR7138; Université de Nice-Sophia-Antipolis; Faculty of Science; 28 Avenue Valrose Nice 06108 France
- Institut de Biologie Paris-Seine; UMR7138; Sorbonne Universités Paris VI; 7 quai Saint Bernard Paris 75005 France
- Institut de Biologie Paris-Seine; UMR7138; Centre National de la Recherche Scientifique; Paris 75016 France
| | - Philippe Ganot
- UMR7138; Université de Nice-Sophia-Antipolis; Faculty of Science; 28 Avenue Valrose Nice 06108 France
- Institut de Biologie Paris-Seine; UMR7138; Sorbonne Universités Paris VI; 7 quai Saint Bernard Paris 75005 France
- Institut de Biologie Paris-Seine; UMR7138; Centre National de la Recherche Scientifique; Paris 75016 France
| | - Fabrice Priouzeau
- UMR7138; Université de Nice-Sophia-Antipolis; Faculty of Science; 28 Avenue Valrose Nice 06108 France
- Institut de Biologie Paris-Seine; UMR7138; Sorbonne Universités Paris VI; 7 quai Saint Bernard Paris 75005 France
- Institut de Biologie Paris-Seine; UMR7138; Centre National de la Recherche Scientifique; Paris 75016 France
| | - Paola Furla
- UMR7138; Université de Nice-Sophia-Antipolis; Faculty of Science; 28 Avenue Valrose Nice 06108 France
- Institut de Biologie Paris-Seine; UMR7138; Sorbonne Universités Paris VI; 7 quai Saint Bernard Paris 75005 France
- Institut de Biologie Paris-Seine; UMR7138; Centre National de la Recherche Scientifique; Paris 75016 France
| | - Cecile Sabourault
- UMR7138; Université de Nice-Sophia-Antipolis; Faculty of Science; 28 Avenue Valrose Nice 06108 France
- Institut de Biologie Paris-Seine; UMR7138; Sorbonne Universités Paris VI; 7 quai Saint Bernard Paris 75005 France
- Institut de Biologie Paris-Seine; UMR7138; Centre National de la Recherche Scientifique; Paris 75016 France
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Barnay-Verdier S, Dall'osso D, Joli N, Olivré J, Priouzeau F, Zamoum T, Merle PL, Furla P. Establishment of primary cell culture from the temperate symbiotic cnidarian, Anemonia viridis. Cytotechnology 2013; 65:697-704. [PMID: 23595421 DOI: 10.1007/s10616-013-9566-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Accepted: 04/10/2013] [Indexed: 01/03/2023] Open
Abstract
The temperate symbiotic sea anemone Anemonia viridis, a member of the Cnidaria phylum, is a relevant experimental model to investigate the molecular and cellular events involved in the preservation or in the rupture of the symbiosis between the animal cells and their symbiotic microalgae, commonly named zooxanthellae. In order to increase research tools for this model, we developed a primary culture from A. viridis animal cells. By adapting enzymatic dissociation protocols, we isolated animal host cells from a whole tentacle in regeneration state. Each plating resulted in a heterogeneous primary culture consisted of free zooxanthellae and many regular, small rounded and adherent cells (of 3-5 μm diameter). Molecular analyses conducted on primary cultures, maintained for 2 weeks, confirmed a specific signature of A. viridis cells. Further serial dilutions and micromanipulation allowed us to obtain homogenous primary cultures of the small rounded cells, corresponding to A. viridis "epithelial-like cells". The maintenance and the propagation over a 4 weeks period of primary cells provide, for in vitro cnidarian studies, a preliminary step for further investigations on cnidarian cellular pathways notably in regard to symbiosis interactions.
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Affiliation(s)
- Stéphanie Barnay-Verdier
- Université Pierre et Marie Curie Paris 6, UMR 7138 Systématique Adaptation Evolution, 7 quai St Bernard, 75252, Paris cedex 05, France,
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Guibbolini M, Borelli G, Mayer-Gostan N, Priouzeau F, De Pontual H, Allemand D, Payan P. Characterization and variations of organic parameters in teleost fish endolymph during day–night cycle, starvation and stress conditions. Comp Biochem Physiol A Mol Integr Physiol 2006; 145:99-107. [PMID: 16777451 DOI: 10.1016/j.cbpa.2006.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2005] [Revised: 04/21/2006] [Accepted: 05/04/2006] [Indexed: 11/22/2022]
Abstract
The aim of the present work was to examine the modifications of the organic composition of fish endolymph under environmental conditions (day-night cycle, starvation and Cl2-stress) known to modify otolith growth. Endolymph electrophoretic patterns were compared. An antibody raised against the trout otolith organic matrix allowed examining the variations of organic matrix precursors in the endolymph under the above conditions. Western blot analysis showed bands around 60-80 kDa. A 50% decrease of immunolabelling was observed during the night whereas increases were seen after starvation (factor 3) or stress (factor 2) suggesting that these variations could be related to the organic matrix deposit. A factor retarding in vitro CaCO3 crystallization (FRC) was shown to co-precipitate with endolymph proteins and its apparent molecular mass (determined by measuring the activity after electro elution of gel electrophoresis) was estimated around 20 kDa. The FRC activity was stable during day-night cycle whereas it decreased by 70% and nearly 100% under starvation and stress respectively. These results suggest that the FRC, although retarding in vitro crystallization, plays a major role in the process of otolith calcification and that the decreases measured after starvation and stress are responsible for the decreases of the otolith growth. The variations of these two parameters (precursors and FRC) could contribute for the changes in the microstructure of the otolith.
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Affiliation(s)
- Marielle Guibbolini
- UMR INRA-UNSA N 1112, Laboratoire ROSE, Université de Nice-Sophia Antipolis, Faculté des Sciences, Parc Valrose, 06108 Nice Cedex 2, France.
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Borelli G, Guibbolini ME, Mayer-Gostan N, Priouzeau F, De Pontual H, Allemand D, Puverel S, Tambutte E, Payan P. Daily variations of endolymph composition: relationship with the otolith calcification process in trout. J Exp Biol 2003; 206:2685-92. [PMID: 12819274 DOI: 10.1242/jeb.00479] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Ionic and organic parameters of the otolith calcification process in the trout Oncorhynchus mykiss were analysed in plasma and endolymph over the day:night cycle. Plasma pH remained constant and total CO(2) concentration was significantly lower (by 21%) during the day than at night. Calcifying parameters (total CO(2), total calcium concentration) were measured in the proximal and distal endolymphs and were unchanged in the latter during the day:night cycle, but fluctuated in the former. Non-collagenous protein and collagen concentrations in endolymph were higher (1.5- and 10-fold, respectively) during the day than at night. As there was no change in total calcium concentration, we propose that Ca(2+) increases during the dark period and was maximal by the end of the night when the total CO(2) concentration has also increased (by 14%). Measurements of endolymph pH in situ revealed significant differences between samples from proximal and distal endolymph (7.38 and 7.87, respectively), but no variation between values obtained during the day and at night. Thus, the saturation state of aragonite (Sa) in the proximal endolymph should fluctuate around unity during the day:night cycle, and CaCO(3) precipitation should occur when supersaturation is reached. The electrophoretic pattern of proximal endolymph showed variations in both major and minor components. Immunoblotting of endolymph, using a rabbit antiserum raised against the otolith soluble organic matrix revealed an increase in the expression of two proteins (65 kDa and 75 kDa) during the day period. We propose that organic matrix and calcium carbonate deposition on the otolith vary antiphasically: organic matrix deposition begins by the end of the day period, when the concentration of organic precursors is maximal in the endolymph, whereas CaCO(3) precipitation starts once the solubility of CaCO(3) is exceeded.
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Affiliation(s)
- G Borelli
- Laboratoire Réponse des Organismes aux Stress Environnementaux, UMR INRA-UNSA 1112, Université de Nice-Sophia Antipolis, Faculté des Sciences, BP 71, 06108 Nice Cedex 2, France
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Payan P, Borelli G, Priouzeau F, De Pontual H, Boeuf G, Mayer-Gostan N. Otolith growth in trout Oncorhynchus mykiss: supply of Ca2+ and Sr2+ to the saccular endolymph. J Exp Biol 2002; 205:2687-95. [PMID: 12151374 DOI: 10.1242/jeb.205.17.2687] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
SUMMARY
Kinetic and pharmacological characteristics of Ca2+ fluxes across the saccular epithelium of trout were studied using a perfused isolated inner ear. 45Ca2+ influx from the Ringer solution to the endolymph was 3-4 nmoles h-1μl-1 endolymph, which corresponds to a global turnover rate of the endolymph calcium of 200 %h-1. Ca2+ entry into the proximal endolymph was faster than into the distal fluid. Net Ca2+ movement across the saccular epithelium depended on the direction and intensity of the chemical gradient of calcium between the Ringer solution and the endolymph. Increasing the calcium concentration in the Ringer solution up to 4.4 mmol l-1 provoked an accumulation of Ca2+ in both proximal and distal endolymphs, and equilibrium was reached about 30 min after the beginning of perfusion. Perfusion with calcium-free Ringer partially emptied the proximal compartment of calcium, whereas the calcium levels in the distal endolymph did not vary during 70 min of perfusion. Verapamil (10-5 mol l-1) and cyanide (CN, 10-3 mol l-1) did not modify the accumulation of Ca2+ within the endolymph in the presence of a favourable calcium chemical gradient. Furthermore the relationship between Ca2+ net fluxes and the chemical calcium gradient across the saccular epithelium was linear, indicating a passive diffusional mechanism via a paracellular pathway. Similar relationships were found for Sr2+ fluxes across the saccular epithelium in the presence of positive chemical gradients (1, 2 and 4 mmol l-1 Sr2+). In vivo experiments in which trout were intraperitoneously injected with CaCl2 solution confirmed the tight relationship between the calcium levels in plasma and endolymph (both proximal and distal). Sampling proximal and distal endolymphs in trout and turbot saccules revealed a decreasing proximo—distal calcium gradient in endolymph of both fish species. The present results strongly suggest that the endolymph is supplied with Ca2+ and Sr2+via a paracellular pathway located in the proximal area of the saccular epithelium.
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Affiliation(s)
- P Payan
- Laboratoire R.O.S.E. (Réponses des Organismes aux Stress Environnementaux), UMR 1112, INRA-UNSA, Université de Nice-Sophia Antipolis, Faculté des Sciences, Parc Valrose, 06108 Nice Cedex 2, France.
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