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Registros recuperados: 26
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A new application of principal response curves for summarizing abrupt and cyclic shifts of communities over space ArchiMer
Auber, Arnaud; Travers-trolet, Morgane; Villanueva, Ching-maria; Ernande, Bruno.
There is a growing need to easily describe and synthesize the dynamics of ecosystems’ components in space and time. Most multivariate analyses provide ordination diagrams or biplots that are too cluttered to allow simple reading and are unfamiliar to most users. To overcome such difficulties, a novel application of principal response curves (PRCs) is proposed. Principal response curves are traditionally used to assess treatment effects on community structure measured repeatedly over time. In this new application, the tested factor and the repeated-observation axis are replaced by time and space, respectively. The georeferencing of sampling sites permits to produce an easy-to-read map that summarizes both the temporal dynamics of the community and the...
Tipo: Text Palavras-chave: Fish communities; Multivariate analyses; Partial redundancy analysis; Spatial management tools; Spatio-temporal dynamics.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00413/52478/53266.pdf
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Benthic-pelagic couplings as key determinants of food web structure along environmental gradients ArchiMer
Lefebvre, Sebastien; Giraldo, Carolina; Kopp, Dorothee; Cresson, Pierre; Travers-trolet, Morgane; Ernande, Bruno.
Trophic relationships play a crucial role in shaping community structure and ecological functions in marine ecosystems. Studying food-web variation along environmental gradients is still in its infancy and provides new insights in understanding how abiotic variables shape species interactions. In epicontinental seas, benthic-pelagic couplings modify predator-prey relationships and lead to entangled trophic networks. Here, we  assumed that depth affects benthic-pelagic couplings’ strength and we investigated depth-related changes in the feeding patterns of fish in the whole English Channel (EC) used as a case study. Gut content and stable carbon and nitrogen isotopes of 33 fish species were collected between 5-100 m depth in 2009 and in 2014. Samples from...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00455/56634/58370.pdf
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CGFS 2016 - Survey Report ArchiMer
Travers-trolet, Morgane; Coppin, Franck.
Tipo: Text
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00358/46944/46850.pdf
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CGFS 2018 - Survey Report ArchiMer
Coppin, Franck; Le Roy, Didier; Goascoz, Nicolas; Travers-trolet, Morgane.
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00491/60248/63651.pdf
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Combined Fishing and Climate Forcing in the Southern Benguela Upwelling Ecosystem: An End-to-End Modelling Approach Reveals Dampened Effects ArchiMer
Travers-trolet, Morgane; Shin, Yunne-jai; Shannon, Lynne J.; Moloney, Coleen L.; Field, John G..
The effects of climate and fishing on marine ecosystems have usually been studied separately, but their interactions make ecosystem dynamics difficult to understand and predict. Of particular interest to management, the potential synergism or antagonism between fishing pressure and climate forcing is analysed in this paper, using an end-to-end ecosystem model of the southern Benguela ecosystem, built from coupling hydrodynamic, biogeochemical and multispecies fish models (ROMS-N2P2Z2D2-OSMOSE). Scenarios of different intensities of upwelling-favourable wind stress combined with scenarios of fishing top-predator fish were tested. Analyses of isolated drivers show that the bottom-up effect of the climate forcing propagates up the food chain whereas the...
Tipo: Text
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00186/29741/28166.pdf
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Combining multiple data sets to unravel the spatiotemporal dynamics of a data-limited fish stock ArchiMer
Pinto, Cecilia; Travers-trolet, Morgane; Macdonald, Jed; Rivot, Etienne; Vermard, Youen.
The biological status of many commercially-exploited fishes remains unknown, mostly due to a lack of data necessary for their assessment. Investigating the spatio-temporal dynamics of such species can lead to new insights into population processes, and foster a path towards improved spatial management decisions. Here, we focused on striped red mullet (Mullus surmuletus), a widespread, yet data-limited species of high commercial importance. Aiming to quantify range dynamics in this data-poor scenario, we combined fishery-dependent and -independent datasets through a series of Bayesian mixed-effects models designed to capture monthly and seasonal occurrence patterns near the species’ northern range limit across 20 years. Combining multiple datasets allowed...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00460/57187/59150.pdf
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Depth gradient on the resource use of a fish community from a semi-enclosed sea ArchiMer
Giraldo, Carolina; Ernande, Bruno; Cresson, Pierre; Kopp, Dorothee; Cachera, Marie; Travers-trolet, Morgane; Lefebvre, Sebastien.
Depth is one of the environmental variables influencing the structure of marine food webs by directly or indirectly influencing benthic-pelagic coupling and predator-prey relationships. In shallow waters, the high degree of connectivity between pelagic and benthic networks results in complex systems with multiple interactions. Digestive tract (DT) and stable isotope (SI) analyses were used to investigate depth-related changes in feeding patterns for 33 fish species (eastern English Channel [EEC]) collected between 5 m and 80 m depth. Fish species were first arranged into functional groups based upon trophic and habitat similarities. DTs were used to determine the general topology of the food web and SIs were used to estimate the contributions of different...
Tipo: Text
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00386/49711/52255.pdf
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Ecological indicators to capture the effects of fishing on biodiversity and conservation status of marine ecosystems ArchiMer
Coll, M.; Shannon, L. J.; Kleisner, K. M.; Juan-jorda, M. J.; Bundy, A.; Akoglu, A. G.; Banaru, Daniela; Boldt, J. L.; Borges, M. F.; Cook, A.; Diallo, I.; Fu, C.; Fox, C.; Gascuel, D.; Gurney, L. J.; Hattab, T.; Heymans, J. J.; Jouffre, D.; Knight, B. R.; Kucukavsar, S.; Large, S. I.; Lynam, C.; Machias, A.; Marshall, K. N.; Masski, H.; Ojaveer, H.; Piroddi, C.; Tam, J.; Thiao, D.; Thiaw, M.; Torres, M. A.; Travers-trolet, Morgane; Tsagarakis, K.; Tuck, I.; Van Der Meeren, G. I.; Yemane, D.; Zador, S. G.; Shin, Y. -j..
IndiSeas (“Indicators for the Seas”) is a collaborative international working group that was established in 2005 to evaluate the status of exploited marine ecosystems using a suite of indicators in a comparative framework. An initial shortlist of seven ecological indicators was selected to quantify the effects of fishing on the broader ecosystem using several criteria (i.e., ecological meaning, sensitivity to fishing, data availability, management objectives and public awareness). The suite comprised: (i) the inverse coefficient of variation of total biomass of surveyed species, (ii) mean fish length in the surveyed community, (iii) mean maximum life span of surveyed fish species, (iv) proportion of predatory fish in the surveyed community, (v) proportion...
Tipo: Text Palavras-chave: Ecological indicators; Marine ecosystems; Biodiversity; Redundancy; Trends; States; Fishing impacts; Conservation.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00281/39201/37902.pdf
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Evaluating changes in marine communities that provide ecosystem services through comparative assessments of community indicators ArchiMer
Kleisner, Kristin M.; Coll, Marta; Lynam, Christopher P.; Bundy, Alida; Shannon, Lynne; Shin, Yunne-jai; Boldt, Jennifer L.; Borges, Maria F.; Diallo, Ibrahima; Fox, Clive; Gascuel, Didier; Heymans, Johanna J.; Juan Jorda, Maria J.; Jouffre, Didier; Large, Scott I.; Marshall, Kristin N.; Ojaveer, Henn; Piroddi, Chiara; Tam, Jorge; Torres, Maria A.; Travers-trolet, Morgane; Tsagarakis, Konstantinos; Van Der Meeren, Gro I.; Zador, Stephani.
Fisheries provide critical provisioning services, especially given increasing human population. Understanding where marine communities are declining provides an indication of ecosystems of concern and highlights potential conflicts between seafood provisioning from wild fisheries and other ecosystem services. Here we use the nonparametric statistic, Kendall׳s tau, to assess trends in biomass of exploited marine species across a range of ecosystems. The proportion of ‘Non-Declining Exploited Species’ (NDES) is compared among ecosystems and to three community-level indicators that provide a gauge of the ability of a marine ecosystem to function both in provisioning and as a regulating service: survey-based mean trophic level, proportion of predatory fish,...
Tipo: Text Palavras-chave: Ecological indicator; Comparative approach; Community metric; IndiSeas; Fishing impacts.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00254/36555/35186.pdf
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Evidence of a relationship between weight and total length of marine fish in the North-eastern Atlantic Ocean: physiological, spatial and temporal variations ArchiMer
Mahe, Kelig; Bellamy, Elise; Delpech, Jean-paul; Lazard, Coline; Salaun, Michele; Verin, Yves; Coppin, Franck; Travers-trolet, Morgane.
Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR...
Tipo: Text Palavras-chave: Weight-length relationship; Condition factor; Bay of Biscay; Celtic Sea; English Channel; North Sea; Sexual dimorphism; Seasonality.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00363/47418/47513.pdf
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Fishing impact and environmental status in European seas: a diagnosis from stock assessments and ecosystem indicators ArchiMer
Gascuel, Didier; Coll, Marta; Fox, Clive; Guenette, Sylvie; Guitton, Jerome; Kenny, Andrew; Knittweis, Leyla; Nielsen, J. Rasmus; Piet, Gerjan; Raid, Tiit; Travers-trolet, Morgane; Shephard, Samuel.
Stock-based and ecosystem-based indicators are used to provide a new diagnosis of the fishing impact and environmental status of European seas. In the seven European marine ecosystems covering the Baltic and the North-east Atlantic, (i) trends in landings since 1950 were examined; (ii) syntheses of the status and trends in fish stocks were consolidated at the ecosystem level; and (iii) trends in ecosystem indicators based on landings and surveys were analysed. We show that yields began to decrease everywhere (except in the Baltic) from the mid-1970s, as a result of the over-exploitation of some major stocks. Fishermen adapted by increasing fishing effort and exploiting a wider part of the ecosystems. This was insufficient to compensate for the decrease in...
Tipo: Text Palavras-chave: Ecosystem approach to fisheries management; Ecosystem indicators; Good environmental status; Marine Strategy Framework Directive; Stock assessment; Trophic level.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00201/31256/29910.pdf
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From Data to End-to-End Models: 15 Years of Research to Describe the Dynamics of Exploited Marine Ecosystems in the Eastern Channel ArchiMer
Marchal, Paul; Gasche, Loic; Girardin, Raphael; Le Pape, Olivier; Huret, Martin; Mahevas, Stephanie; Travers-trolet, Morgane; Vaz, Sandrine.
Considerable research has been conducted in the past 15 years around the Eastern English Channel ecosystem. Data collected since the 1970s on the biotic and abiotic compartments have been collated and mapped out in the mid-2000. This spatially explicit information formed a sound basis to improve knowledge on, and model, the functioning and dynamics of key ecosystem compartments, with a focus on flatfish species and fisheries and their interactions with other sectors of activity (aggregate extractions, maritime traffic). The more recent ongoing works are dedicated to the integration of those processes into several complementary end-to-end ecosystem models.
Tipo: Text Palavras-chave: Eastern English Channel; Flatfish; Spatial analyses; Ecosystem modelling.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00293/40420/38946.pdf
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Identification of the main processes underlying ecosystem functioning in the Eastern English Channel, with a focus on flatfish species, as revealed through the application of the Atlantis end-to-end model ArchiMer
Girardin, Raphael; Fulton, Elizabeth A.; Lehuta, Sigrid; Rolland, Marie; Thebaud, Olivier; Travers-trolet, Morgane; Vermard, Youen; Marchal, Paul.
The ecosystem model Atlantis was used to investigate the key dynamics and processes that structure the Eastern English Channel ecosystem, with a particular focus on two commercial flatfish species, sole (Solea solea) and plaice (Pleuronectes platessa). This complex model was parameterized with data collected from diverse sources (a literature review, survey data, as well as landings and stock assessment information) and tuned so both simulated biomass and catch fit 2002–2011 observations. Here, the outputs are mainly presented for the two focus species and for some other vertebrates found to be important in the trophic network. The calibration process revealed the importance of coastal areas in the Eastern English Channel and of nutrient inputs from...
Tipo: Text Palavras-chave: Ecosystem modelling; Flatfish fisheries; Trophic relationships; Calibration; Atlantis; Eastern English Channel.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00354/46524/46289.pdf
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Improving the interpretation of fishing effort and pressures in mixed fisheries using spatial overlap metrics ArchiMer
Bourdaud, Pierre; Travers-trolet, Morgane; Vermard, Youen; Marchal, Paul.
Managing mixed fisheries requires understanding fishers’ behaviour to allow predicting future fisheries distribution and impact on marine ecosystems. A new approach was developed to compare fine scale fishing effort distribution of Eastern English Channel (EEC) bottom trawlers, to the monthly- and spatially-resolved abundance distributions of commercial species. First, the added-value of using species-specific spatial overlap metric to quantify effective fishing effort and improve the relationship between fishing effort and fishing mortality was assessed. Second, based on the Ideal Free Distribution (IFD) theory, the species-specific weights given by fishers to different species were estimated by maximizing the overlap between target species assemblage and...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00446/55747/57402.pdf
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Inferring the annual, seasonal, and spatial distributions of marine species from complementary research and commercial vessels’ catch rates ArchiMer
Bourdaud, Pierre; Travers-trolet, Morgane; Vermard, Youen; Cormon, Xochitl; Marchal, Paul.
The objective of this study is to analyse at fine scale the annual, seasonal and spatial distributions of several species in the Eastern English Channel (EEC). On the one hand, data obtained from scientific surveys are not available all year through, but are considered to provide consistent yearly and spatially resolved abundance indices. On the other hand, on-board commercial data do cover the whole year, but generally provide a biased perception of stock abundance. The combination of scientific and commercial catches per unit of effort (CPUEs), standardized using a delta-generalized linear model, allowed to infer spatial and monthly dynamics of fish distributions in the EEC, which could be compared with previous knowledge on their life cycles....
Tipo: Text Palavras-chave: Commercial data; Eastern English Channel; Seasonality; Spatial distribution; Survey data.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00387/49805/50385.pdf
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Projecting changes in the distribution and productivity of living marine resources: A critical review of the suite of modeling approaches used in the large European project VECTORS ArchiMer
Peck, Myron A.; Arvanitidis, Christos; Butenschon, Momme; Canu, Donata Melaku; Chatzinikolaou, Eva; Cucco, Andrea; Domenici, Paolo; Fernandes, Jose A.; Gasche, Loic; Huebert, Klaus B.; Hufnagl, Marc; Jones, Miranda C.; Kempf, Alexander; Keyl, Friedemann; Maar, Marie; Mahevas, Stephanie; Marchal, Paul; Nicolas, Delphine; Pinnegar, John K.; Rivot, Etienne; Rochette, Sebastien; Sell, Anne F.; Sinerchia, Matteo; Solidoro, Cosimo; Somerfield, Paul J.; Teal, Lorna R.; Travers-trolet, Morgane; Van De Wolfshaar, Karen E..
We review and compare four broad categories of spatially-explicit modelling approaches currently used to understand and project changes in the distribution and productivity of living marine resources including: 1) statistical species distribution models, 2) physiology-based, biophysical models of single life stages or the whole life cycle of species, 3) food web models, and 4) end-to-end models. Single pressures are rare and, in the future, models must be able to examine multiple factors affecting living marine resources such as interactions between: i) climate-driven changes in temperature regimes and acidification, ii) reductions in water quality due to eutrophication, iii) the introduction of alien invasive species, and/or iv) (over-)exploitation by...
Tipo: Text Palavras-chave: Distribution; Modelling; Habitat; Resources; Man-induced effects.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00337/44845/44436.pdf
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Rapport de campagne CGFS 2017 ArchiMer
Coppin, Franck; Travers-trolet, Morgane.
Tipo: Text
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00415/52658/53515.pdf
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Reconciling complex system models and fisheries advice: Practical examples and leads ArchiMer
Lehuta, Sigrid; Girardin, Raphael; Mahevas, Stephanie; Travers-trolet, Morgane; Vermard, Youen.
The move toward an ecosystem-based fisheries management (EBFM) requires new operational tools in order to support management decisions. Among them, ecosystem- and fisheries-based models are critical to quantitatively predict the consequences of future scenarios by integrating available knowledge about the ecosystem across different scales. Despite increasing development of these complex system models in the last decades, their operational use is still currently limited in Europe. Many guidelines are already available to help the development of complex system models for advice yet they are often ignored. We identified three main impediments to the use of complex system models for decision support: (1) their very complexity which is a source of uncertainty;...
Tipo: Text Palavras-chave: Ecosystem-based fisheries management; Complex models; Decision support; Methodological solutions; Participatory modeling; Model sensitivity analysis; Examples.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00358/46945/46851.pdf
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Recurrent winter observations of Mnemiopsis leidyi swarms in the Southern North Sea ArchiMer
Antajan, Elvire; Loots, Christophe; Travers-trolet, Morgane; Vaz, Sandrine.
Tipo: Text Palavras-chave: Ctenophore; Invasive species; Mnemiopsis leidyi; North Sea.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00259/37007/35506.pdf
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Regime Shift in an Exploited Fish Community Related to Natural Climate Oscillations ArchiMer
Auber, Arnaud; Travers-trolet, Morgane; Villanueva, Ching-maria; Ernande, Bruno.
Identifying the various drivers of marine ecosystem regime shifts and disentangling their respective influence are critical tasks for understanding biodiversity dynamics and properly managing exploited living resources such as marine fish communities. Unfortunately, the mechanisms and forcing factors underlying regime shifts in marine fish communities are still largely unknown although climate forcing and anthropogenic pressures such as fishing have been suggested as key determinants. Based on a 24-year-long time-series of scientific surveys monitoring 55 fish and cephalopods species, we report here a rapid and persistent structural change in the exploited fish community of the eastern English Channel from strong to moderate dominance of small-bodied...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38466/36886.pdf
Registros recuperados: 26
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