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Auteur (down) Theuerkauff, D.; Rivera-Ingraham, G.A.; Roques, J.A.C.; Azzopardi, L.; Bertini, M.; Lejeune, M.; Farcy, E.; Lignot, J.-H.; Sucre, E.
Titre Salinity Variation in a Mangrove Ecosystem: A Physiological Investigation to Assess Potential Consequences of Salinity Disturbances on Mangrove Crabs Type Article scientifique
Année 2018 Publication Revue Abrégée Zool. Stud.
Volume 57 Numéro Pages 36
Mots-Clés Bioenergetics; blue-crab; callinectes-sapidus; carcinus-maenas; Decapods; dilocarcinus-pagei brachyura; eriocheir-sinensis; fiddler-crabs; fresh-water; grapsid crabs; Mangrove; Osmoregulation; oxidative stress; Salinity-induced oxidative stress; waste-water treatment
Résumé Dimitri Theuerkauff, Georgina A. Rivera-Ingraham, Jonathan A.C. Roques, Laurence Azzopardi, Marine Bertini, Mathilde Lejeune, Emilie Farcy, Jehan-Herve Lignot, and Elliott Sucre (2018) Salinity is one of the main environmental factors determining coastal species distribution. However, in the specific case of mangrove crabs, salinity selection cannot be understood through ecological approaches alone. Yet understanding this issue is crucial in the context of mangrove conservation, since this ecosystem is often used as biofilter of (low-salinity) wastewater. Crabs are keystone species in this mangrove ecosystem and are differentially affected by salinity. We hypothesize that crab salinity selection may be partly explained by specific salinity-induced physiological constraints associated with osmoregulation, energy and redox homeostasis. To test this, the response to salinity variation was analysed in two landward mangrove crabs: the fiddler crab Tubuca urvillei, which inhabits low-salinity areas of the mangrove, and the red mangrove crab Neosarmatium meinerti, which lives in areas with higher salinity. Results confirm that both species are strong hypo-/hyper-osmoregulators that deal easily with large salinity variations. Such shifts in salinity do not induce changes in energy expenditure (measured as oxygen consumption) or in the production of reactive oxygen species. However, T. urvillei is physiologically suited to habitats with brackish water, since it presents i) high hemolymph osmolalities over a wider range of salinities and lower osmoregulatory capacity in seawater, ii) high Na+/K+-ATPase (NKA) activity in the posterior osmoregulatory gills and iii) a thicker osmoregulatory epithelium along the posterior gill lamellae. Therefore, while environmental salinity alone cannot directly explain fiddler and red mangrove crab distributions, our data suggest that salinity selection is indeed influenced by specific physiological adjustments.
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Volume de collection Numéro de collection Edition
ISSN 1021-5506 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2424
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Auteur (down) Teulier, L.; Thoral, E.; Queiros, Q.; McKenzie, D.J.; Roussel, D.; Dutto, G.; Gasset, E.; Bourjea, J.; Saraux, C.
Titre Muscle bioenergetics of two emblematic Mediterranean fish species: Sardina pilchardus and Sparus aurata Type Article scientifique
Année 2019 Publication Revue Abrégée Comp. Biochem. Physiol. A-Mol. Integr. Physiol.
Volume 235 Numéro Pages 174-179
Mots-Clés aerobic capacity; Bioenergetics; gait transition; Lipids; Marine fishes; metabolic fuels; pathways; physiology; Red muscle; responses; skeletal-muscle; slow; swimming performance; temperature
Résumé We investigated links between swimming behavior and muscle bioenergetics in two emblematic Mediterranean fish species that have very different ecologies and activity levels. European sardines Sardina pilchardus are pelagic, they swim aerobically, school constantly and have high muscle fat content. Gilthead seabream Sparus aurata are bentho-pelagic, they show discontinuous spontaneous swimming patterns and store less fat in their muscle. Estimating the proportion of red and white muscle phenotypes, sardine exhibited a larger proportion of red muscle (similar to 10% of the body mass) compared to gilthead seabream (similar to 5% of the body mass). We firstly studied red and white muscle fiber bioenergetics, using high-resolution respirometers, showing a 4-fold higher oxidation capacity for red compared to white muscle. Secondly, we aimed to compare the red muscle ability to oxidize either lipids or carbohydrates. Sardine red muscle had a 3-fold higher oxidative capacity than gilthead seabream and a greater capacity to oxidize lipids. This study provides novel insights into physiological mechanisms underlying the different lifestyles of these highly-prized species.
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Volume de collection Numéro de collection Edition
ISSN 1095-6433 ISBN Médium
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Notes WOS:000481561100018 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2629
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Auteur (down) Schiettekatte, N.M.D.; Barneche, D.R.; Villeger, S.; Allgeier, J.E.; Burkepile, D.E.; Brandl, S.J.; Casey, J.M.; Merciere, A.; Munsterman, K.S.; Morat, F.; Parravicini, V.
Titre Nutrient limitation, bioenergetics and stoichiometry: A new model to predict elemental fluxes mediated by fishes Type Article scientifique
Année 2020 Publication Revue Abrégée Funct. Ecol.
Volume 34 Numéro 9 Pages 1857-1869
Mots-Clés bioenergetics; body-composition; carbon; enzyme-activities; excretion; fish; growth; ingestion; maximum metabolic-rate; nitrogen; nutrient limitation; nutrient cycling; phosphorus; predation risk; rates; stoichiometry
Résumé Energy flow and nutrient cycling dictate the functional role of organisms in ecosystems. Fishes are key vectors of carbon (C), nitrogen (N) and phosphorus (P) in aquatic systems, and the quantification of elemental fluxes is often achieved by coupling bioenergetics and stoichiometry. While nutrient limitation has been accounted for in several stoichiometric models, there is no current implementation that permits its incorporation into a bioenergetics approach to predict ingestion rates. This may lead to biased estimates of elemental fluxes. Here, we introduce a theoretical framework that combines stoichiometry and bioenergetics with explicit consideration of elemental limitations. We examine varying elemental limitations across different trophic groups and life stages through a case study of three trophically distinct reef fishes. Further, we empirically validate our model using an independent database of measured excretion rates. Our model adequately predicts elemental fluxes in the examined species and reveals species- and size-specific limitations of C, N and P. In line with theoretical predictions, we demonstrate that the herbivoreZebrasoma scopasis limited by N and P, and all three fish species are limited by P in early life stages. Further, we show that failing to account for nutrient limitation can result in a greater than twofold underestimation of ingestion rates, which leads to severely biased excretion rates. Our model improved predictions of ingestion, excretion and egestion rates across all life stages, especially for fishes with diets low in N and/or P. Due to its broad applicability, its reliance on many parameters that are well-defined and widely accessible, and its straightforward implementation via the accompanyingr-packagefishflux, our model provides a user-friendly path towards a better understanding of ecosystem-wide nutrient cycling in the aquatic biome. A freePlain Language Summarycan be found within the Supporting Information of this article.
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ISSN 0269-8463 ISBN Médium
Région Expédition Conférence
Notes WOS:000550711600001 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2858
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Auteur (down) Sadoul, B.; Augustine, S.; Zimmer, E.; Begout, M.-L.; Vijayan, M.M.
Titre Prediction of long-term variation in offspring metabolism due to BPA in eggs in rainbow trout using the DEB model Type Article scientifique
Année 2019 Publication Revue Abrégée J. Sea Res.
Volume 143 Numéro Pages 222-230
Mots-Clés acceleration; bisphenol-a bpa; energetics; energy budget model; exposure; fathead minnow; growth; oncorhynchus-mykiss; starvation; zebrafish
Résumé Bisphenol A (BPA) in eggs prior to fertilization was found to induce long-term metabolic disturbances in juvenile rainbow trout (Oncorhynchus mykiss). Here we describe these imprinting effects in a Dynamic Energy Budget (DEB) framework, which allows interpretation of the data in an energy allocation context. First, DEB parameters for control rainbow trout were optimized using data extracted from 12 studies in the literature. Several modes of action on DEB parameters were then tested in order to correctly predict weight differences observed in rainbow trout in response to 5 different concentrations of BPA in eggs prior to fertilization. Reduced energy conductance (v) over dot at day 0, followed by an exponential recovery, was found to closely fit the experimental data. Effects on (v) over dot lasted beyond the disappearance of the chemical from the body, suggesting an imprinting effect of BPA on energy mobilization from the reserve. Our model predicts that early changes in DEB parameters lead to permanent and irreversible impairment of the metabolic growth acceleration in rainbow trout.
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ISSN 1385-1101 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2473
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Auteur (down) Marras, S.; Killen, S.S.; Lindström, J.; McKenzie, D.J.; Steffensen, J.F.; Domenici, P.
Titre Fish swimming in schools save energy regardless of their spatial position Type Article scientifique
Année 2015 Publication Revue Abrégée Behav Ecol Sociobiol
Volume 69 Numéro 2 Pages 219-226
Mots-Clés Collective behaviour; Ecophysiology; Energetics; Hydrodynamics
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ISSN 0340-5443 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1285
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