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Registros recuperados: 64
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Mechanisms of change in human behaviour ArchiMer
Marchal, Paul; Bartelings, Heleen; Bastardie, François; Batsleer, Jurgen; Delaney, Alyne; Girardin, Raphael; Gloaguen, Pierre; Hamon, Katell; Hoefnagel, Ellen; Jouanneau, Charlène; Mahevas, Stephanie; Nielsen, Rasmus; Piwowarczyk, Joanna; Poos, Jan-jaap; Schulze, Torsten; Rivot, Etienne; Simons, Sarah; Tidd, Alex; Vermard, Youen; Woillez, Mathieu.
The scope of this report is to present the science developed within the VECTORS project to improve the understanding of the key processes driving the behaviour of human agents utilising a variety of EU maritime domains. While particular attention has been paid to the spatial interactions between fishing activities and other human uses (e.g., maritime traffic, offshore wind parks, aggregate extractions), the behaviour of non-fishing sectors of activity has also been considered. Various quantitative and semi-qualitative approaches have been pursued to gain better insight into behavioural drivers based on past data, and also forecast how human agents would react if access was constrained by either management (e.g. Marine Protected Areas – MPA), or the...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00223/33377/31802.pdf
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Mixed fisheries management: protecting the weakest link ArchiMer
Batsleer, Jurgen; Poos, J. J.; Marchal, Paul; Vermard, Youen; Rijnsdorp, A. D..
North Sea cod Gadus morhua stock is outside safe biological limits, and total allowable catch (TAC) management has proved ineffective to rebuild the stock. The European Commission is considering the imposition of a discard ban to preserve vulnerable and economically important fish stocks. We explored the potential effects of a discard ban in mixed fisheries management using the French mixed fisheries in the Eastern English Channel as a model system. We examined in particular the performance of 2 different management scenarios: (1) individual quota management with a tolerance for discarding and (2) individual quota management in combination with a discard ban, using a dynamic state variable model. The model evaluates a time series of decisions taken by...
Tipo: Text Palavras-chave: Discard ban; TAC; Dynamic State Variable Modelling; Eastern English Channel; Cod; Gadus morhua; Mixed fisheries; Fleet dynamics.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00137/24781/22834.pdf
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Modélisation de la distribution de Beryx splendens sur les monts sous-marins de Nouvelle-Calédonie IRD
Lehodey, Patrick; Marchal, Paul; Grandperrin, René.
Les prises commerciales et scientifiques de #Beryx splendens$ réalisées à la palangre de fond sur les monts sous-marins de Nouvelle-Calédonie ont été échantillonnées afin d'étudier, entre autres, les distributions de fréquences de longueurs. 16 674 poissons ont été mesurés. Les CPUE de #Beryx splendens$ sur deux monts sous-marins ont été modélisées en fonction des tailles et de la profondeur. Les données montrent que la taille moyenne augmente avec la profondeur ; ces observations sont correctement décrites par un "modèle binormal" qui fournit des estimations de CPUE pour un mont sous-marin donné. De plus, les données indiquent que la taille moyenne varie également avec la profondeur sommitale des monts, ce qui est pris en compte dans un "modèle récursif"...
Tipo: Text Palavras-chave: PECHE EXPERIMENTALE; POISSON MARIN; ESPECE COMMERCIALE; TECHNIQUE DE PECHE; PALANGRE; STOCK; PROFONDEUR; MODELISATION; MONT SOUS MARIN; MODELE BINORMAL; MODELE RECURSIF; RELATION ESPECE ENVIRONNEMENT.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40811
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Modelling the distribution of alfonsino, Beryx splendens, over the seamounts of New Caledonia IRD
Lehodey, Patrick; Marchal, Paul; Grandperrin, René.
Commercial and scientific bottom longline catches of alfonsino, #Beryx splendens$, from seamounts of New Caledonia were sampled to study length-frequency distributions. A total of 14,674 fish were measured. CPUE of #Beryx splendens$ on two seamounts is modelled in terms of length and depth. The data show that mean length increases with depth ; this is well described by a bivariate normal model that estimates catch for a given seamount. In addition, the data show that mean length also varies with the depth of the top of seamounts ; this is described by a recursive model that is designed to predict approximate catch for any seamount. The limitations of both models are discussed, particularly with regard to temporal variation. (Résumé d'auteur)
Tipo: Text Palavras-chave: POISSON MARIN; ECHANTILLONNAGE; LONGUE LIGNE; CROISSANCE; PROFONDEUR; ANALYSE STATISTIQUE; MODELE MATHEMATIQUE.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:010006413
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North Sea saithe Pollachius virens growth in relation to food availability, density dependence and temperature ArchiMer
Cormon, Xochitl; Ernande, Bruno; Kempf, Alexander; Vermard, Youen; Marchal, Paul.
North Sea saithe Pollachius virens, a major top predator in the area, supports the fishery economy of several European countries. However, recent stock assessments suggested a decrease in spawning stock biomass along with a decline in saithe mean weight-at-ages. In this context, we investigated North Sea saithe growth characteristics at the population level. First, saithe annual weight increments and age-length relationships were studied. Modelling of saithe age-length relationships was carried out using (1) the traditional von Bertalanffy growth function model, (2) the Verhulst logistic model and (3) an empirical linear model. Second, the effects of environmental factors on saithe growth were investigated. Explanatory environmental factors included food...
Tipo: Text Palavras-chave: Bottom-up processes; Von Bertalanffy growth function; Logistic growth; Norway pout; Prey availability effects; Density-dependence; Predator-prey interactions; Resource limitation; Competition.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00314/42499/41875.pdf
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Ontogenetic shift in the energy allocation strategy and physiological condition of larval plaice (Pleuronectes platessa) ArchiMer
Di Pane, Julien; Joly, Lea; Koubbi, Philippe; Giraldo, Carolina; Monchy, Sébastien; Tavernier, Eric; Marchal, Paul; Loots, Christophe.
Condition indices aim to evaluate the physiological status of fish larvae by estimating both the level of starvation and potential of survival. Histological indices reveal direct effects of starvation whereas biochemical indices such as lipid classes or RNA:DNA ratios are used as proxies of condition, giving information on the amount of energy reserves and growth rate, respectively. We combined these three indices to evaluate ontogenetic variations of growth performance, lipid dynamics and nutritional condition of plaice larvae caught in the field during winter 2017 in the eastern English Channel and the Southern Bight of the North Sea. RNA:DNA ratios showed that larvae at the beginning of metamorphosis (stage 4) had a lower growth rate than younger...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00514/62610/66974.pdf
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Predicting fisher response to competition for space and resources in a mixed demersal fishery ArchiMer
Girardin, Raphael; Vermard, Youen; Thebaud, Olivier; Tidd, Alex; Marchal, Paul.
Understanding and modelling fleet dynamics and their response to spatial constraints is a prerequisite to anticipating the performance of marine ecosystem management plans. A major challenge for fisheries managers is to be able to anticipate how fishing effort is re-allocated following any permanent or seasonal closure of fishing grounds, given the competition for space with other active maritime sectors. In this study, a Random Utility Model (RUM) was applied to determine how fishing effort is allocated spatially and temporally by the French demersal mixed fleet fishing in the Eastern English Channel. The explanatory variables chosen were past effort i.e. experience or habit, previous catch to represent previous success, % of area occupied by spatial...
Tipo: Text Palavras-chave: Effort allocation; Random Utility Model; Spatial competition; Demersal mixed fishery; Eastern English Channel; Spatial management.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00250/36153/37312.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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Quota allocation in mixed fisheries: a bioeconomic modelling approach applied to the Channel flatfish fisheries ArchiMer
Marchal, Paul; Little, L. Richard; Thebaud, Olivier.
A simulation modelling approach is used to assess the respective performances of different regimes of quota allocation (fixed or transferable), quota ownership (owned or not by fishers), and taxation for catching fish above quota. The simulations account for a variety of fleet behaviours (ranging from fixed by tradition to dynamic economics-driven). The modelling framework is applied to the Channel flatfish mixed fisheries. Transferable quota allocation regimes would particularly benefit small netters and beam trawlers, which would achieve a profit of (sic)50-150 million without compromising the conservation of eastern Channel sole, but it could impair the sustainability of other stocks. If quota is owned by fishers, the least fishing-efficient fleet stops...
Tipo: Text Palavras-chave: Channel flatfish mixed fisheries; Fisheries management; Fleet dynamics; Individual quotas; Overquota landing tax; Plaice (Pleuronectes platessa); Sole (Solea solea).
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00044/15492/12971.pdf
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Recent changes in ichthyoplanktonic assemblages of the eastern English Channel ArchiMer
Di Pane, Julien; Koubbi, Philippe; Giraldo, Carolina; Lefebvre, Valerie; Caboche, Josselin; Marchal, Paul; Loots, Christophe.
ish assemblages vary through time in both abundance and diversity, often due to changes in climate. The potential consequences of these changes on the larval phase need to be considered. In the Eastern English Channel, fish larvae of 30 taxa, from surveys conducted during spring in the nineties and in 2017 with bongo nets, were used to investigate seasonal and interannual changes in larval assemblages with different statistical tests and multivariate analyses (Outlying Mean Index, Principal Coordinate Analysis and variance partitioning). The major change observed was significant lower abundances in 2017 (in April and May) compared to the nineties. Most of the dominant taxa were two to three-fold less abundant in 2017 than the 1990s. We suggest that the...
Tipo: Text Palavras-chave: Fish larvae; Temporal variations; Atlantic Multidecadal Oscillation; Outlying Mean Index; Variance partitioning; English Channel.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00604/71631/70078.pdf
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Reproduction de Beryx splendens sur les monts sous-marins de Nouvelle-Calédonie IRD
Lehodey, Patrick; Marchal, Paul.
Tipo: Text Palavras-chave: POISSON MARIN; DYNAMIQUE DE POPULATION; MATURITE SEXUELLE; ANALYSE DE DONNEES; REPRODUCTION; FECONDITE; CORRELATION STATISTIQUE; HISTOLOGIE; GONADE; OVOGENESE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:40809
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Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea ArchiMer
Timmerman, Charles-andre; Marchal, Paul; Denamiel, Margaux; Couvreur, Clemence; Cresson, Pierre.
An accurate description of trophic interactions is crucial to understand ecosystem functioning and sustainably manage marine ecosystems exploitation. Carbon and nitrogen stable isotopes were coupled with stomach content analyses to investigate whiting (Merlangius merlangus, Linnaeus, 1758) feeding behavior in the Eastern English Channel and Southern North Sea. Whiting juveniles and adults were sampled in autumn and winter to investigate both ontogenetic and seasonal changes. In addition, queen scallops (Aequipecten opercularis) samples were collected along with fish to be used as isotopic benthic baseline. Results indicated an ontogenetic diet change from crustaceans to fish and cephalopods. In autumn, δ15N values generally increased with fish size while...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00651/76359/77350.pdf
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Solutions for ecosystem-level protection of ocean systems under climate change ArchiMer
Queiros, Ana M.; Huebert, Klaus B.; Keyl, Friedemann; Fernandes, Jose A.; Stolte, Willem; Maar, Marie; Kay, Susan; Jones, Miranda C.; Hamon, Katell; Hendriksen, Gerrit; Vermard, Youen; Marchal, Paul; Teal, Lorna R.; Somerfield, Paul J.; Austen, Melanie C.; Barange, Manuel; Sell, Anne F.; Allen, Icarus; Peck, Myron A..
The Paris Conference of Parties (COP21) agreement renewed momentum for action against climate change, creating the space for solutions for conservation of the ocean addressing two of its largest threats: climate change and ocean acidification (CCOA). Recent arguments that ocean policies disregard a mature conservation research field and that protected areas cannot address climate change may be oversimplistic at this time when dynamic solutions for the management of changing oceans are needed. We propose a novel approach, based on spatial meta-analysis of climate impact models, to improve the positioning of marine protected areas to limit CCOA impacts. We do this by estimating the vulnerability of ocean ecosystems to CCOA in a spatially explicit manner and...
Tipo: Text Palavras-chave: Climate change; Conservation; COP21; Ecosystem model; Habitat; Marine spatial planning; Ocean; Ocean acidification; Species distribution; Warming.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00360/47089/48566.pdf
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Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) in the North Sea ArchiMer
Cormon, Xochitl; Loots, Christophe; Vaz, Sandrine; Vermard, Youen; Marchal, Paul.
Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) were investigated in the North Sea. Saithe is a well-established species in the North Sea, while occurrence of the less common hake has recently increased in the area. Spatial dynamics of these two species and their potential spatial interactions were explored using binomial generalized linear models (GLM) applied to the International Bottom Trawl Survey (IBTS) data from 1991 to 2012. Models included different types of variables: (i) abiotic variables including sediment types, temperature, and bathymetry; (ii) biotic variables including potential competitors and potential preys presence; and (iii) spatial variables. The models were reduced and used to predict and map...
Tipo: Text Palavras-chave: Biotic interactions; Competition; Generalized linear models; Hake; North Sea; Overlap; Predator-prey relationship; Saithe; Species distribution modelling.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00200/31146/29847.pdf
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Strengths and Weaknesses of the Management and Monitoring of Deep-Water Stocks, Fisheries, and Ecosystems in Various Areas of the World-A Roadmap Toward Sustainable Deep-Water Fisheries in the Northeast Atlantic? ArchiMer
Large, Philip A.; Agnew, David J.; Alvarez Perez, Jose Angel; Barrio Frojan, Christopher; Cloete, Rudi; Damalas, Dimitrios; Dransfeld, Leonie; Edwards, Charles T. T.; Feist, Stephen; Figueiredo, Ivone; Gonzalez, Fernando; Gil Herrera, Juan; Kenny, Andrew; Jakobsdottir, Klara; Longshaw, Matt; Lorance, Pascal; Marchal, Paul; Mytilineou, Chryssi; Planque, Benjamin; Politou, Chrissi-yianna.
Scientific interest in deep-water marine resources has increased dramatically over the last 10-20 years as management bodies have sought advice on how to manage deep-water fisheries and protect deep-water ecosystems. The strengths and weaknesses of the management and monitoring of deep-water stocks, fisheries, and ecosystems in various areas of the world are described, with the objective of informing the EU FP7 DEEPFISHMAN project so that it can fulfill its primary aim, which is to develop strategic options for a short-and long-term management and monitoring ecosystem-based framework for the northeast Atlantic. To provide a baseline, the current monitoring and management regime in the northeast Atlantic is reviewed, followed by a brief description of the...
Tipo: Text Palavras-chave: Deep-water; Fisheries; Ecosystem; Monitoring; Management.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00142/25321/24803.pdf
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Supporting Fisheries Management by Means of Complex Models: Can We Point out Isles of Robustness in a Sea of Uncertainty? ArchiMer
Gasche, Loic; Mahevas, Stephanie; Marchal, Paul.
Ecosystems are usually complex, nonlinear and strongly influenced by poorly known environmental variables. Among these systems, marine ecosystems have high uncertainties: marine populations in general are known to exhibit large levels of natural variability and the intensity of fishing efforts can change rapidly. These uncertainties are a source of risks that threaten the sustainability of both fish populations and fishing fleets targeting them. Appropriate management measures have to be found in order to reduce these risks and decrease sensitivity to uncertainties. Methods have been developed within decision theory that aim at allowing decision making under severe uncertainty. One of these methods is the information-gap decision theory. The info-gap...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00166/27746/25947.pdf
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Technological Development and Fisheries Management ArchiMer
Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik; Rijnsdorp, Adriaan D..
Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism referred to as “technological creep.” We review how the introduction of new and more efficient electronic equipment, gear design, engines, deck equipment, and catch-handling procedures influences the capture efficiency (catchability) of commercial fishing vessels. On average, we estimate that catchability increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of...
Tipo: Text Palavras-chave: Catchability; Fishing mortality; Fishing power; Fisheries management; Fleet capacity; Technological development.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00222/33368/35784.pdf
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The Channel Programme: A Large-Scale Integrated Approach ArchiMer
Marchal, Paul; Carpentier, Andre; Foucher, Eric.
The Channel programme is a collation of interlinked multidisciplinary projects supporting ecosystem-based management in the English Channel by integrating works carried out in the past thirty years including novel approaches to the spatial modelling of ecosystems. The Channel programme has required a coordination of efforts and expertise by both scientists and stakeholders to address the challenges of the Marine Strategy Framework Directive and of its national implementations. The Channel programme has also consisted of harmonising information, regulations and habits in terms of ecosystem management in the English Channel.
Tipo: Text Palavras-chave: English Channel; Marine environment; Ecosystem-based management; Impact of anthropic and environmental factors; Scientific support to natural living resources management.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00294/40489/39613.pdf
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The regional management of fisheries in European Western Waters ArchiMer
Le Floc'H, Pascal; Murillas, Arantza; Aranda, Martin; Daures, Fabienne; Fitzpatrick, Mike; Guyader, Olivier; Hatcher, Aaron; Macher, Claire; Marchal, Paul.
A survey of past and existing management measures applied to different fisheries in European Western Waters is analyzed as a typology of co-management between governments and stakeholders. Faced with increasing constraints on accessing fish stocks, management measures have evolved toward fishing rights individualization, limited access and various other specific measures. Restrictions on access have changed fishermen’s behaviour in several significant ways. A comparative analysis, based on qualitative data collected through interviews and focus groups, is developed for fisheries from the following European countries: France, Ireland, Spain and the United Kingdom. Past and existing individual harvesting rights in the four countries are reviewed and compared.
Tipo: Text Palavras-chave: Management; Fishery governance; Common Fishery Policy (CFP).
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00248/35912/34455.pdf
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The relative weight of traditions, economics, and catch plans in New Zealand fleet dynamics ArchiMer
Marchal, Paul; Lallemand, Philippe; Stokes, Kevin.
We investigate the relative weights of catch plans expected profit, and traditions in fishers' decision-making For five New Zealand fleets subject to an individual transferable quota (ITQ) management regime. Metiers were defined for these fleets as a combination of bears. management units, and a targeting index (either target species or statistical area) A nested logit random utility model was Used to model the metier allocation of fishing, effort in relation to catch plans, expected profit, and Past fishing allocations. This study showed that traditions and catch plans appeared to be important determinants of fishers' behavior for these New Zealand fleets. The model developed in thiS study filled the data generally well and was also able to predict, in...
Tipo: Text Palavras-chave: Random Utility Model; New Zealand fisheries; Fleet dynamics; Catch plans; Individual Transferable Quotas.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6418.pdf
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