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Your search keyword '"Nadalini, Jean-Bruno"' showing total 11 results
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11 results on '"Nadalini, Jean-Bruno"'

9. Use of valvometry as an alert tool to signal the presence of toxic algae Alexandrium catenella by Mytilus edulis

Author

Durier, Guillaume, Nadalini, Jean-Bruno, Comeau, Luc A., Starr, Michel, Michaud, Sonia, Tran, Damien, St-Louis, Richard, Babarro, José M. F., Clements, Jeff C., Tremblay, Réjean, Government of Canada, and Environment and Climate Change Canada

Subjects
Global and Planetary Change, Harmful Algal Blooms (HABs), Behavioural ecology, Paralytic Shellfish Poisoning (PSP), Ocean Engineering, Environmental stress, Aquatic Science, Oceanography, Water Science and Technology
Abstract

17 pages, 7 figures, 3 tables.-- This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY), Valvometry is a non-invasive technique used to continuously monitor gaping behaviour of bivalves at high frequency. In previous laboratory studies, valvometry has revealed a behavioural sensitivity of bivalves to the presence of toxic microalgae in seawater. However, the application of valvometry as an early-warning system for detecting natural occurrences of toxic microalgae and their resulting toxicity in bivalves remains largely unexplored. In this study, valvometry was used to characterise changes in blue mussels (Mytilus edulis) gaping behaviour during gradual exposure to the toxic dinoflagellate, Alexandrium catenella, which produces paralytic shellfish toxins (PST). Laboratory experiments were first performed to identify specific gaping behaviour changes and these responses were subsequently validated in natural seawater conditions in a second experiment. Under both laboratory and natural seawater conditions, mussels exposed to A. catenella tended to remain open (yawning) longer than non-exposed mussels. This change in gaping behaviour was observed at PST concentration as low as 30 μg STXeq 100 g–1 of mussel tissue. We suggest that increased opening is likely related to temporary muscular paralysis induced by toxic algae, as this mechanism has been previously reported in other bivalve species. Furthermore, we observed that biological rhythms of valve behaviour related to tidal and daily rhythms were modified when mussels were intoxicated by PSP (Paralytic Shellfish Poisoning). In conclusion, the effects of toxic algae on mussel gaping behaviour reveals that valvometry could be used as an early-warning tool for the presence of toxic Alexandrium sp. in the environment prior to mussels reaching the regulatory threshold (80 μg STXeq 100 g–1) for harvest interdiction, This project was undertaken with the financial support of the Government of Canada, specifically by a research grant from Environment and Climate Change Canada provided to RT’s (FDE-CA-2017i002) and by the Ressources Aquatiques Québec research network (Fonds de Recherche du Québec – Nature et Technologies, no. 2014-RS-171172)

Published
2022

10. Trophic environments influence size at metamorphosis and recruitment performance of Pacific oysters

Author

Lagarde, Franck, Richard, Marion, Bec, Beatrice, Roques, Cecile, Mortreux, Serge, Bernard, Ismael, Chiantella, Claude, Messiaen, Gregory, Nadalini, Jean-bruno, Hori, Masakazu, Hamaguchi, Masami, Pouvreau, Stephane, Roque D'Orbcastel, Emmanuelle, Tremblay, Rejean, Lagarde, Franck, Richard, Marion, Bec, Beatrice, Roques, Cecile, Mortreux, Serge, Bernard, Ismael, Chiantella, Claude, Messiaen, Gregory, Nadalini, Jean-bruno, Hori, Masakazu, Hamaguchi, Masami, Pouvreau, Stephane, Roque D'Orbcastel, Emmanuelle, and Tremblay, Rejean

Abstract

Reproduction and recruitment of benthic invertebrates are influenced by the climate and by the ecological structure of marine ecosystems, along with local anthropogenic pressures such as eutrophication or oligotrophication. Using the Pacific oyster Crassostrea gigas as a biological model, we tested the hypothesis that the variability in prodissoconch II (PII) size (i.e. size at metamorphosis) depends on ecological functioning. Settlement and recruitment were assessed at 5 sampling sites on the French Mediterranean shellfish farmed Thau lagoon during the main summer recruitment events in 3 consecutive years (2012-2014). Hydrobiological and planktonic analyses were conducted at 3 sampling sites. Our results showed that recruitment was extremely heterogeneous, ranging from 0 to 260 ± 27 SE ind. dm-2 throughout the ecosystem and was linked with variability in PII size, which ranged from 180 to 296 µm. The annual temporal pattern of PII sizes appeared to be controlled by temperature during the settlement period, whereas the spatial pattern depended on phytoplankton biomass and on the trophic functioning of the ecosystem. Smaller PII sizes were significantly correlated with the highest phytoplankton biomass, while larger PII sizes were positively correlated with mixotrophic cryptophyte abundance. We found an inverse relationship between PII size and survival after metamorphosis, showing that recruitment success was associated with smaller PII sizes. Regional climate conditions and local trophic functioning appear to be key factors in metamorphosis and consequently contribute to recruitment heterogeneity. Further studies should be performed in other ecosystems following an oligotrophication trajectory to generalize this result.

Published
2018
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11. Determination of isotopic labeling of proteins by precursor ion scanning liquid chromatography/tandem mass spectrometry of derivatized amino acids applied to nuclear magnetic resonance studies

Author

LeBlanc, André, primary, Arnold, Alexandre A., additional, Genard, Bertrand, additional, Nadalini, Jean-Bruno, additional, Heine, Marc-Olivier Séguin, additional, Marcotte, Isabelle, additional, Tremblay, Réjean, additional, and Sleno, Lekha, additional

Published
2012
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