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Auteur (up) Rivera-Ingraham, G.A.; Rocchetta, I.; Bickmeyer, U.; Meyer, S.; Abele, D.
Titre Spatial compartmentalization of free radical formation and mitochondrial heterogeneity in bivalve gills revealed by live-imaging techniques Type Article scientifique
Année 2016 Publication Revue Abrégée Frontiers in Zoology
Volume 13 Numéro Pages 4
Mots-Clés Bivalve; Fluorescence; Gill; Live-imaging; Mitochondria; Rns; Ros
Résumé Reactive oxygen (ROS) and nitrogen (RNS) species are produced during normal unstressed metabolic activity in aerobic tissues. Most analytical work uses tissue homogenates, and lacks spatial information on the tissue specific sites of actual ROS formation. Live-imaging techniques (LIT) utilize target-specific fluorescent dyes to visualize biochemical processes at cellular level.
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ISSN 1742-9994 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1542
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Auteur (up) Tran, T.T.V.; Phan, L.K.; Durand, J.-D.
Titre Diversity and distribution of cryptic species within the Mugil cephalus species complex in Vietnam Type Article scientifique
Année 2017 Publication Revue Abrégée Mitochondrial DNA Part A
Volume 28 Numéro 4-5 Pages 493-501
Mots-Clés Cryptic species; cytochrome b; cytochrome oxidase I; divergence; genetic diversity; marginal seas; mitochondrial phylogeny; northwestern pacific; phylogeography; pleistocene isolation; population-growth; striped mullet; teleostei mugilidae
Résumé Mugil cephalus sensu lato is a globally distributed complex of cryptic species whose distribution range and evolutionary history remains largely unknown. In the North West (NW) Pacific three species have been identified genetically among fish described morphologically as M. cephalus. Their distribution ranges are largely parapatric and has been proposed to mirror different thermal preferences. To date, few samples have been analyzed from South China Sea, which limits inferences on the evolutionary history of the species complex. We sampled fish identified morphologically as M. cephalus along Vietnamese shores and characterized them using the sequence polymorphism of two mitochondrial genes, the cytochrome oxidase I and cytochrome b. This demonstrated that all three species described in the NW Pacific are present in both northern and southern Vietnamese waters. Although the difference in species abundance reflects those observed in the NW Pacific, no phylogeographic pattern was revealed. In addition, no population structure was observed whatever the species or the distribution range considered, which indicates a significant level of gene flow that maintains genetic homogeneity of the three species. It is also conceivable that each species experienced a recent population expansion from a single ancestral population. Finally we suggest that if the cold waters of the NW Pacific present a physiologic challenge leading to the almost parapatric distribution of the three species, then it is likely that the warm surface temperatures of the South China Sea negate this barrier.
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Langue English Langue du Résumé Titre Original
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ISSN 2470-1394 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2160
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Auteur (up) Viblanc, V. A.; Schull, Q.; Roth, J.D.; Rabdeau, J.; Saraux, C.; Uhlrich, P.; Criscuolo, F.; Dobson, F. S.; Gremillet, D.
Titre Maternal oxidative stress and reproduction: Testing the constraint, cost and shielding hypotheses in a wild mammal Type Article scientifique
Année 2018 Publication Revue Abrégée Functional Ecology
Volume 32 Numéro 3 Pages 722-735
Mots-Clés antioxidant; body condition; cost of reproduction; life history; mammal; mitochondria; trade‐off
Résumé Abstract Oxidative stress has been proposed as a central causal mechanism underlying the life?history trade?off between current and future reproduction and survival in wild animals. While mixed evidence suggests that maternal oxidative stress may act both as a constraint and a cost to reproduction, some studies have reported a lack of association between reproduction and maternal oxidative stress. The oxidative shielding hypothesis offers an alternative explanation, suggesting that mothers may pre?emptively mitigate the oxidative costs of reproduction by increasing antioxidant defences prior to reproduction. We tested the oxidative constraint, cost and shielding hypotheses using a longitudinal field study of oxidative stress levels in a species that breeds using daily energy income, the Columbian ground squirrel (Urocitellus columbianus). Elevated maternal oxidative damage prior to reproduction was associated with higher maternal investment in litter mass at birth, but not at weaning. Breeding females increased their antioxidant capacity and decreased their oxidative damage from birth to lactation, compared to non?breeding females measured at the same time periods. However, lower maternal oxidative stress during lactation was not associated with higher offspring survival or mass growth over this period. Our results provide little evidence for maternal oxidative stress acting as a constraint on, or cost to, reproduction in Columbian ground squirrels, but partially support the idea that oxidative shielding occurred to buffer potential oxidative costs of reproduction. A plain language summary is available for this article.
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ISSN 0269-8463 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2306
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