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Auteur |
Lebrato, M.; Wang, Y.V.; Tseng, L.-C.; Achterberg, E.P.; Chen, X.-G.; Molinero, J.-C.; Bremer, K.; Westernstroeer, U.; Soeding, E.; Dahms, H.-U.; Kueter, M.; Heinath, V.; Joehnck, J.; Konstantinou, K.I.; Yang, Y.J.; Hwang, J.-S.; Garbe-Schoenberg, D. |
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Titre |
Earthquake and typhoon trigger unprecedented transient shifts in shallow hydrothermal vents biogeochemistry |
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Article scientifique |
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Année |
2019 |
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Revue Abrégée |
Sci Rep |
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Volume |
9 |
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16926 |
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Mots-Clés |
arc; cleaning procedures; fluids; foraminiferal mg/ca; island; kueishantao; ocean acidification; sea; seawater; taiwan |
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Résumé |
Shallow hydrothermal vents are of pivotal relevance for ocean biogeochemical cycles, including seawater dissolved heavy metals and trace elements as well as the carbonate system balance. The Kueishan Tao (KST) stratovolcano off Taiwan is associated with numerous hydrothermal vents emitting warm sulfur-rich fluids at so-called White Vents (WV) and Yellow Vent (YV) that impact the surrounding seawater masses and habitats. The morphological and biogeochemical consequences caused by a M5.8 earthquake and a C5 typhoon (“Nepartak”) hitting KST (12th May, and 2nd-10th July, 2016) were studied within a 10-year time series (2009-2018) combining aerial drone imagery, technical diving, and hydrographic surveys. The catastrophic disturbances triggered landslides that reshaped the shoreline, burying the seabed and, as a consequence, native sulfur accretions that were abundant on the seafloor disappeared. A significant reduction in venting activity and fluid flow was observed at the high-temperatureYV. Dissolved Inorganic Carbon (DIC) maxima in surrounding seawater reached 3000-5000 mu mol kg(-1), and Total Alkalinity (TA) drawdowns were below 1500-1000 mu mol kg(-1) lasting for one year. A strong decrease and, in some cases, depletion of dissolved elements (Cd, Ba, Tl, Pb, Fe, Cu, As) including Mg and Cl in seawater from shallow depths to the open ocean followed the disturbance, with a recovery of Mg and Cl to pre-disturbance concentrations in 2018. The WV and YV benthic megafauna exhibited mixed responses in their skeleton Mg:Ca and Sr:Ca ratios, not always following directions of seawater chemical changes. Over 70% of the organisms increased skeleton Mg:Ca ratio during rising DIC (higher CO2) despite decreasing seawater Mg:Ca ratios showing a high level of resilience. KST benthic organisms have historically co-existed with such events providing them ecological advantages under extreme conditions. The sudden and catastrophic changes observed at the KST site profoundly reshaped biogeochemical processes in shallow and offshore waters for one year, but they remained transient in nature, with a possible recovery of the system within two years. |
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2045-2322 |
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WOS:000496716800010 |
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MARBEC @ isabelle.vidal-ayouba @ |
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2663 |
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Auteur |
Cruaud, P.; Decker, C.; Olu, K.; Arnaud-Haond, S.; Papot, C.; Le Baut, J.; Vigneron, A.; Khripounoff, A.; Gayet, N.; Cathalot, C.; Caprais, J.-C.; Pignet, P.; Godfroy, A.; Cambon-Bonavita, M.-A. |
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Titre |
Ecophysiological differences between vesicomyid species and metabolic capabilities of their symbionts influence distribution patterns of the deep-sea clams |
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Article scientifique |
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Année |
2019 |
Publication |
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Revue Abrégée |
Mar. Ecol.-Evol. Persp. |
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Volume |
40 |
Numéro |
3 |
Pages |
e12541 |
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Mots-Clés |
calyptogena-magnifica; chemoautotrophic bacteria; cold seeps; community structure; deep-sea ecosystems; evolutionary relationships; guaymas basin; Guaymas Basin; gulf-of-california; hydrothermal vent clam; macrofaunal communities; marine ecology; pliocardinae bivalve; sulfide-rich sediments; sulfur storage; vesicomyid movements |
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Résumé |
This study provides an analysis of vesicomyid bivalve-symbiont community distribution across cold seep and hydrothermal vent areas in the Guaymas Basin (Gulf of California, Mexico). Using a combination of morphological and molecular approaches including fluorescent in situ hybridization (FISH), and electronic microscopy observations, vesicomyid clam species and their associated symbionts were characterized and results were analyzed in light of geochemical conditions and other on-site observations. A greater diversity of vesicomyids was found at cold seep areas, where three different species were present (Phreagena soyoae [syn. kilmeri], Archivesica gigas, and Calyptogena pacifica). In contrast, A. gigas was the only species sampled across the hydrothermal vent area. The same haplotype of A. gigas was found in both hydrothermal vent and cold seep areas, highlighting possible contemporary exchanges among neighboring vents and seeps. In either ecosystem, molecular characterization of the symbionts confirmed the specificity between symbionts and hosts and supported the hypothesis of a predominantly vertical transmission. In addition, patterns of clams could reflect potential niche preferences for each species. The occurrence of numerous traces of vesicomyid movements on sediments in the sites colonized by A. gigas seemed to indicate that this species might have a better ability to move. Furthermore, variation in gill sulfur content could reveal a higher plasticity and sulfur storage capacity in A. gigas. Thus, the distribution of vesicomyid species across the chemosynthetic areas of the Guaymas Basin could be explained by differences in biological traits of the vesicomyid species that would allow A. gigas to more easily exploit transient and punctual sources of available sulfide than P. soyoae. |
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0173-9565 |
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WOS:000472949800006 |
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MARBEC @ isabelle.vidal-ayouba @ |
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2605 |
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Auteur |
Blanchard, F.; Chaboud, C.; Thebaud, O. |
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Titre |
Back to the future: A retrospective assessment of model-based scenarios for the management of the shrimp fishery in French Guiana facing global change |
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Article scientifique |
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Année |
2019 |
Publication |
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Revue Abrégée |
Nat. Resour. Model. |
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e12232 |
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bio-economic model; climate change; numerical simulation; retrospective analysis; seafood market; tropical shrimp fishery; uncertainty |
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Résumé |
While the number of models dedicated to predicting the consequences of alternative resource management strategies has increased, instances in which authors look back at past predictions to learn from discrepancies between these and observed developments are scarce. In the past decades, the French Guiana shrimp fishery has experienced shrimp market globalization and decreasing levels of shrimp recruitment due to environmental changes. In 2006, a bio-economic model of this fishery was developed to simulate its possible responses to economic and environmental scenarios up to 2016. Here, we compare here these predictions to the observed trajectories. While the number of active vessels corresponds to that which was predicted, the estimated shrimp stock does not. Important driving factors had not been anticipated, including a general strike, natural disasters, and the end of the global financial crisis. These results show the importance of participative approaches involving stakeholders in the co-construction and shared representation of scenarios. Recommendations for resource managers Effective fisheries resources management and a fortiori, the capacity of the fisheries to adapt to global change, requires understanding of both ecological and economics dynamics. The temporal trajectory of the trawling shrimp fisheries has been well monitored, and the decline of both stock and fleet is understood regarding ecological and economic changes: Changes in the environmental conditions of shrimp recruitment, and oil price increase and selling price decrease. However, our bio-economic modeling work showed that, even with a good understanding of the dynamics explaining past trajectories, unpredictable events (strike, natural disasters horizontal ellipsis ) have acted as other key driving factors altering the capacity of the model to represent possible futures. These results led us to recommend a better integration of the expertise of social and political scientists in developing models of bio-economic systems to increase the quality of scenario predictions, and to argue for more participative approaches involving the stakeholders. |
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0890-8575 |
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WOS:000476048000001 |
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MARBEC @ isabelle.vidal-ayouba @ |
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2618 |
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Auteur |
Saeedi, H.; Reimer, J.D.; Brandt, M.; Dumais, P.-O.; Jazdzewska, A.M.; Jeffery, N.W.; Thielen, P.M.; Costello, M.J. |
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Global marine biodiversity in the context of achieving the Aichi Targets: ways forward and addressing data gaps |
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Article scientifique |
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Année |
2019 |
Publication |
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Revue Abrégée |
PeerJ |
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Volume |
7 |
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e7221 |
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Aichi targets; assemblages; benefits; Biodiversity tools and pipelines; Biogeography; conservation; coral-reefs; Data standard; Data standards; deep-sea; Discovery; Dissemination; diversity gradient; life; Marine biodiversity; patterns; Prediction; progress; species richness; Stewardship; Stewardship and dissemination; Tools and pipelines |
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In 2010, the Conference of the Parties of the Convention on Biological Diversity agreed on the Strategic Plan for Biodiversity 2011-2020 in Aichi Prefecture, Japan. As this plan approaches its end, we discussed whether marine biodiversity and prediction studies were nearing the Aichi Targets during the 4th World Conference on Marine Biodiversity held in Montreal, Canada in June 2018. This article summarises the outcome of a five-day group discussion on how global marine biodiversity studies should be focused further to better understand the patterns of biodiversity. We discussed and reviewed seven fundamental biodiversity priorities related to nine Aichi Targets focusing on global biodiversity discovery and predictions to improve and enhance biodiversity data standards (quantity and quality), tools and techniques, spatial and temporal scale framing, and stewardship and dissemination. We discuss how identifying biodiversity knowledge gaps and promoting efforts have and will reduce such gaps, including via the use of new databases, tools and technology, and how these resources could be improved in the future. The group recognised significant progress toward Target 19 in relation to scientific knowledge, but negligible progress with regard to Targets 6 to 13 which aimed to safeguard and reduce human impacts on biodiversity. |
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2167-8359 |
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WOS:000493041100001 |
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MARBEC @ isabelle.vidal-ayouba @ |
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2682 |
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Auteur |
Cahill, A.E.; De Jode, A.; Dubois, S.; Bouzaza, Z.; Aurelle, D.; Boissin, E.; Chabrol, O.; David, R.; Egea, E.; Ledoux, J.-B.; Mérigot, B.; Weber, A.A.-T.; Chenuil, A. |
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A multispecies approach reveals hot spots and cold spots of diversity and connectivity in invertebrate species with contrasting dispersal modes |
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Article scientifique |
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Année |
2017 |
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Revue Abrégée |
Mol. Ecol. |
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26 |
Numéro |
23 |
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6563-6577 |
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genetic diversity; dispersal; life-history traits; reef fishes; marine connectivity; pelagic larval duration; mediterranean sea; amphipholis-squamata; brooding brittle star; coralligenous assemblages; larvae; marine invertebrates; phylogeographical breaks; population structure; population genetic-structure; species genetic diversity correlation |
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Genetic diversity is crucial for species' maintenance and persistence, yet is often overlooked in conservation studies. Species diversity is more often reported due to practical constraints, but it is unknown if these measures of diversity are correlated. In marine invertebrates, adults are often sessile or sedentary and populations exchange genes via dispersal of gametes and larvae. Species with a larval period are expected to have more connected populations than those without larval dispersal. We assessed the relationship between measures of species and genetic diversity, and between dispersal ability and connectivity. We compiled data on genetic patterns and life history traits in nine species across five phyla. Sampling sites spanned 600km in the northwest Mediterranean Sea and focused on a 50-km area near Marseilles, France. Comparative population genetic approaches yielded three main results. (i) Species without larvae showed higher levels of genetic structure than species with free-living larvae, but the role of larval type (lecithotrophic or planktotrophic) was negligible. (ii) A narrow area around Marseilles, subject to offshore advection, limited genetic connectivity in most species. (iii) We identified sites with significant positive contributions to overall genetic diversity across all species, corresponding with areas near low human population densities. In contrast, high levels of human activity corresponded with a negative contribution to overall genetic diversity. Genetic diversity within species was positively and significantly linearly related to local species diversity. Our study suggests that local contribution to overall genetic diversity should be taken into account for future conservation strategies. |
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0962-1083 |
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MARBEC @ alain.herve @ |
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2262 |
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