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Auteur Robert, M.; Dagorn, L.; Deneubourg, J.L.
Titre The aggregation of tuna around floating objects: What could be the underlying social mechanisms? Type Article scientifique
Année 2014 Publication Revue Abrégée Journal of Theoretical Biology
Volume 359 Numéro Pages 161-170
Mots-Clés Fish Aggregating Devices; Models of aggregation; Monte Carlo multi-agents simulations; Social behavior
Résumé Several empirical and theoretical studies have shown how the exploitation of food sources, the choice of resting sites or other types of collective decision-making in heterogeneous environments are facilitated and modulated by social interactions between conspecifics. It is well known that many pelagic fishes live in schools and that this form of gregarious behavior provides advantages in terms of food intake and predator avoidance efficiency. However, the influence of social behavior in the formation of aggregations by tuna under floating objects (FOBs) is poorly understood. In this work, we investigated the collective patterns generated by different theoretical models, which either include or exclude social interactions between conspecifics, in the presence of two aggregation sites. The resulting temporal dynamics and distributions of populations were compared to in situ observations of tuna behavior. Our work suggests that social interactions should be incorporated in aggregative behavior to reproduce the temporal patterns observed in the field at both the individual and the group level, challenging the common vision of tuna aggregations around FOBs. Our study argues for additional data to further demonstrate the role of social behavior in the dynamics of these fish aggregations. Understanding the interplay between environmental and social factors in the associative behavior of fish with FOBs is necessary to assess the consequences of the widespread deployment of artificial FOBs by fishermen.
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ISSN 0022-5193 ISBN Médium
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Auteur Li, X.; Blancheton, J.-P.; Liu, Y.; Triplet, S.; Michaud, L.
Titre Effect of oxidation-reduction potential on performance of European sea bass (Dicentrarchus labrax) in recirculating aquaculture systems Type Article scientifique
Année 2014 Publication Revue Abrégée Aquaculture International
Volume 22 Numéro 4 Pages 1263-1282
Mots-Clés culture-system; disinfection; european sea bass; Orp; ozonated; Ozone; performance; Ras; responses; rock lobster; salinity; seawater; sublethal exposure; trout oncorhynchus-mykiss; water-quality
Résumé The direct impact of oxidation-reduction potential (ORP) on fish welfare and water quality in marine recirculating aquaculture systems (RAS) is poorly documented. In this study, the effects of the fish size (S-1, S-2, S-3) and ORP level (normal, four successive levels) on the performance of European sea bass (Dicentrarchus labrax) were investigated. Three size fish were distributed into two RAS (RAS and RAS O-3). Ozone was injected into RAS O-3 to increase the ORP level. The ORP was stabilized to four successive levels: 260-300, 300-320, 320-350, and 300-320 mV in fish tanks during four periods (P1-4). At the last day of each period, the hematological parameters, plasma protein and mortality of sea bass were analyzed. Two-way ANOVA revealed that several hematological parameters, including pH, hematocrit, concentrations of oxygen, carbon dioxide, glucose (Glu), ionized calcium, kalium, and hemoglobin, were significantly influenced by the increased ORP levels over the experimental period. The alteration in blood Glu and plasma protein concentration showed that ORP around 300-320 mV started to stress sea bass. Once the ORP exceeded 320 mV in the tanks during the P-3 period, mortality occurred even when total residual oxidants/ozone-produced oxidants was only 0.03-0.05 mg L-1 in the fish tanks. At the same time, plasma protein decreased notably due to appetite depression. After the decrease in ORP during the P-4 period, mortality continued. In conclusion, the results strongly suggest that for European sea bass in RAS, the ORP should not exceed 320 mV in the tanks. Once ozonation damaged fish, the effect seemed to be irreversible. However, how ORP affected related hematological parameters still need the further investigations.
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ISSN 0967-6120 ISBN Médium
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Notes <p>ISI Document Delivery No.: AL4MD<br/>Times Cited: 1<br/>Cited Reference Count: 35<br/>Li, Xian Blancheton, Jean-Paul Liu, Ying Triplet, Sebastien Michaud, Luigi<br/>National Natural Science Foundation of China [41306152]; National Science and Technology Support Program [2011BAD13B04]<br/>The authors would thank all the participants from the Ifremer Palavas station: Cyrille Przybyla, Myriam Callier, and Thibault Geoffroy for their contribution to the experiment and analyses. This work was supported by the National Natural Science Foundation of China (Grant No. 41306152) and National Science and Technology Support Program (Grant No. 2011BAD13B04).<br/>Springer<br/>Dordrecht</p> Approuvé pas de
Numéro d'Appel MARBEC @ alain.herve @ collection 1168
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Auteur Pool, T.K.; Grenouillet, G.; Villeger, S.
Titre Species contribute differently to the taxonomic, functional, and phylogenetic alpha and beta diversity of freshwater fish communities Type Article scientifique
Année 2014 Publication Revue Abrégée Diversity and Distributions
Volume 20 Numéro 11 Pages 1235-1244
Mots-Clés Beta diversity; fish conservation; functional and phylogenetic diversity
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ISSN 1472-4642 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1172
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Auteur Toussaint, A.; Beauchard, O.; Oberdorff, T.; Brosse, S.; Villeger, S.
Titre Historical assemblage distinctiveness and the introduction of widespread non-native species explain worldwide changes in freshwater fish taxonomic dissimilarity Type Article scientifique
Année 2014 Publication Revue Abrégée Global Ecology and Biogeography
Volume 23 Numéro 5 Pages 574-584
Mots-Clés Beta diversity; differentiation; freshwater fish; homogenization; macroecology; partitioning; turnover
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ISSN 1466-8238 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1174
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Auteur Triki, H.Z.; Daly-Yahia, O.K.; Malouche, D.; Komiha, Y.; Deidun, A.; Brahim, M.; Laabir, M.
Titre Distribution of resting cysts of the potentially toxic dinoflagellate Alexandrium pseudogonyaulax in recently-deposited sediment within Bizerte Lagoon (Mediterranean coast, Tunisia) Type Article scientifique
Année 2014 Publication Revue Abrégée Marine Pollution Bulletin
Volume 84 Numéro 1-2 Pages 172-181
Mots-Clés Alexandrium pseudogonyaulax; autocorrelation; bay; Benthic; blooms; cysts; dynamics; eutrophication; gonyaulax-excavata; gulf; Harmful algae; Mapping; Mediterranean Lagoon of Bizerte; resting cysts; Sediment characteristics; spatial-distribution; surface sediments
Résumé This study investigated the spatial distribution of Alexandrium pseudogonyaulax resting cysts in recently-deposited sediment of Bizerte lagoon (South-Western Mediterranean, Tunisia). This lagoon is the subject of many anthropogenic impacts, such as holding important fishing and aquaculture activities. A. pseudogonyaulax has been shown to produce Goniodomin A, which is a biologically-active compound. We showed that this dinoflagellate produces two types of resting cysts, which could be distinguished by the presence or the absence of a paratabulate wall. The average cyst density across the whole lagoon was rather high, reaching 639 cysts g(-1) of dry sediment (DS). Cyst densities varied widely among the sampled stations, with the highest density of 1685 cyst g(-1) DS being recorded at station 51 near a mussel farm. With respect to sediment characteristics, the highest cyst densities were found within silty sediments with high water content values. The distribution of A. pseudongoyaulax cysts in Bizerte lagoon appears to be related to hydrodynamic factors. (C) 2014 Elsevier Ltd. All rights reserved.
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Notes <p>ISI Document Delivery No.: AL0GF<br/>Times Cited: 0<br/>Cited Reference Count: 45<br/>Triki, Habiba Zmerli Daly-Yahia, Ons Kefi Malouche, Dhafer Komiha, Yosr Deidun, Alan Brahim, Mouldi Iaabir, Mohamed<br/>JEAI ECO-BIZ (Jeune Equipe Associee, Ecologie de la lagune de Bizerte) program – IRD (Institut Francais pour la Recherche et le Developpement), IRD; TOTAL Foundation<br/>This work benefitted from financial supports from the JEAI ECO-BIZ (Jeune Equipe Associee, Ecologie de la lagune de Bizerte) program funded by IRD (Institut Francais pour la Recherche et le Developpement), IRD also funded 2 months stay of Dr. Mohamed Laabir in Tunis (INAT). Thanks to TOTAL Foundation for funding LAGUNOTOX project which supported financially the stay of Mrs Triki-Zmerli in Montpellier.<br/>Pergamon-elsevier science ltd<br/>Oxford</p> Approuvé pas de
Numéro d'Appel MARBEC @ alain.herve @ collection 1175
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