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| Registros recuperados: 26 | |
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| Planque, Benjamin; Mullon, Christian; Arneberg, Per; Eide, Arne; Fromentin, Jean-marc; Heymans, Johanna Jacomina; Hoel, Alf Håkon; Niiranen, Susa; Ottersen, Geir; Sandø, Anne Britt; Sommerkorn, Martin; Thébaud, Olivier; Thorvik, Thorbjørn. |
| Anticipating future changes in marine social‐ecological systems (MSES) several decades into the future is essential in the context of accelerating global change. This is challenging in situations where actors do not share common understandings, practices, or visions about the future. We introduce a dedicated scenario method for the development of MSES scenarios in a participatory context. The objective is to allow different actors to jointly develop scenarios which contain their multiple visions of the future. The method starts from four perspectives: “fisheries management,” “ecosystem,” “ocean climate,” and “global context and governance” for which current status and recent trends are summarized. Contrasted scenarios about possible futures are elaborated... |
| Tipo: Text |
Palavras-chave: Barents Sea; Future studies; Multiple perspectives; Participatory fisheries management; Storylines; Uncertainty. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00485/59621/62647.pdf |
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| Planque, Benjamin; Fromentin, Jean-marc. |
| Spatial and temporal patterns of Calanusfinmarchicus and C. helgolandicus (Copepoda, Calanoida) were investigated in the northeast Atlantic and the North Sea from 1962 to 1992. The seasonal cycle of C.finmarchicus is characterised by a single peak of abundance in spring, whereas the seasonal cycle of C. helgolandicus shows 2 abundance maxima, one in spring and one in autumn. The former species mainly occurs in northern regions (limited by the 55*N parallel in the North Sea and by the 50*N parallel in the open ocean). The latter species shows 2 types of spatial patterns, occurring in the Celtic Sea during spring and in the Celtic Sea plus the North Sea in autumn. Differences in seasonal spatial patterns of Calanus species may result from different responses... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00033/14458/11760.pdf |
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| Fromentin, Jean-marc; Planque, Benjamin. |
| The influence of the North Atlantic Oscillation (NAO) on 2 major zooplankton species ofthe eastern North Atlantic and the North Sea, Calanus finmarchicus and C. helgolandicus (Copepoda, Calanoida), was investigated. Our results confirm that from December to April, west wind stress (WWS) intensity and temperature are strongly related to the NAO. If these results were expected, more striking were the close relationships between NAO and Calanus species abundance. Fluctuations in abundance of C. finmarchicus mainly result from the combination of 2 factors, both driven by the NAO: WWS effects on spring primary production and temperature. The case of C. helgolandicus is more complicated,as the links between this species and the NAO result from the combination of... |
| Tipo: Text |
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| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00033/14456/11758.pdf |
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| Rouyer, Tristan; Fromentin, Jean-marc; Menard, Felix; Calzelles, B; Briand, K; Pianet, R; Planque, Benjamin; Stenseth, N. |
| The patterns of variations in fisheries time series are known to result from a complex combination of species and fisheries dynamics all coupled with environmental forcing (including climate, trophic interactions, etc.). Disentangling the relative effects of these factors has been a major goal of fisheries science for both conceptual and management reasons. By examining the variability of 169 tuna and billfish time series of catch and catch per unit effort (CPUE) throughout the Atlantic as well as their linkage to the North Atlantic Oscillation (NAO), we find that the importance of these factors differed according to the spatial scale. At the scale of the entire Atlantic the patterns of variations are primarily spatially structured, whereas at a more... |
| Tipo: Text |
Palavras-chave: Time series analysis; North Atlantic Oscillation; Atlantic tuna. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3984.pdf |
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| Planque, Benjamin; Lazure, Pascal; Jegou, Anne-marie. |
| A complex set of hydrodynamical structures co-exist over the Bay of Biscay continental shelf. These structures, which can spread over a limited spatial range (10s of km) and last for periods ranging from days to months, influence the rates and nature of biological production. They need to be accurately described before the mechanisms linking hydrodynamics to production can be unraveled. Such description generally requires not only 3D observations of hydrological fields (temperature, salinity, density), but also a description of how these fields vary with time. This is hardly achievable with current means of field observation but can be mimicked by hydrodynamic model simulations. Using simulations from a 3D hydrodynamic model, we developed a methodology... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Hydrology; Hydrodynamic model; Spring; Typology. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00000/10933/7575.pdf |
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| Bellier, Edwige; Planque, Benjamin; Petitgas, Pierre. |
| The spatial extent of small pelagic fish spawning habitat is influenced by environmental factors and by the state of the adult population. In return, the configuration of spawning habitat affects recruitment and therefore the future structure of the adult population. Interannual changes in spatial patterns of spawning reflect variations in adult population structures and their environment. The present study describes the historical changes in the spatial distribution of spawning of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during two periods: 1967-72 and 2000-2004. Using data from egg surveys conducted in spring, the spatial distributions of anchovy and sardine eggs are characterized by means of geostatistics.... |
| Tipo: Text |
Palavras-chave: Spawning habitat; Spatial patterns; Sardine; Long term changes; Bay of Biscay; Anchovy. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2179.pdf |
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| Planque, Benjamin; Fromentin, Jean-marc; Cury, Philippe; Drinkwater, Kenneth F.; Jennings, Simon; Perry, R. Ian; Kifani, Souad. |
| Evidence has accumulated that climate variability influences the state and functioning of marine ecosystems. At the same time increasing pressure from exploitation and other human activities has been shown to impact exploited and non-exploited species and potentially modify ecosystem structure. There has been a tendency among marine scientists to pose the question as a dichotomy, i.e., whether (1) "natural" climate variability or (2) fishery exploitation bears the primary responsibility for population declines in fish populations and the associated ecosystem changes. However, effects of both climate and exploitation are probably substantially involved in most cases. More importantly, climate and exploitation interact in their effects, such that climate may... |
| Tipo: Text |
Palavras-chave: Resilience; Marine ecosystems; Demography; Climate fishing interactions. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/2010/publication-7384.pdf |
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| Fromentin, Jean-marc; Planque, Benjamin; Thebaud, Olivier. |
| This document discusses the possible evolutions of IFREMER's research activities in support of the ecosystem-based approach to fisheries management (EAF). It results from an investigation undertaken within the programme "Ecosystem approach to the management of fish resources" (DÉMarche écOSysTÉMique pour une gestion des Ressources Halieutiques"). The first part of the document presents the background to the development of the EAF, particularly the increasing number of reports of resource over-exploitation, the issue of sustainability of exploitation systems, the diversification of uses of marine resources, the key role of governance and the degradation of the state of the ecosystems. The second part aims at synthesizing the challenges faced by research... |
| Tipo: Text |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/rapport-2567.pdf |
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| Buecher, E; Goy, J; Planque, Benjamin; Etienne, M; Dallot, S. |
| Fluctuations in the abundance of developmental stages and adults of the medusa Liriope tetraphylla were monitored from 1966 to 1993 in the bay of Villefranche-sur-Mer, Northwestern Mediterranean Sea. L. tetraphylla exhibited large interannual variations in both mean abundance level and seasonality, Cluster analysis was applied to classify as ''poor'', years with medium to scarce populations evenly distributed the year; as ''normal'', years with a population maximum during autumn as frequently observed in the Mediterranean; and as ''special'', years with strong population maxima localized in spring or summer. The changing jellyfish abundance levels appeared not to be reliably linked to long-term changes in sea water temperature and salinity, even if... |
| Tipo: Text |
Palavras-chave: Jellyfish; Liriope tetraphylla; Pelagia noctiluca; Long-term fluctuations; Mediterranean Sea. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20387/18054.pdf |
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| Planque, Benjamin; Ibanez, F. |
| Year-to-year changes in abundance of the copepod Calanus finmarchicus in the North Atlantic are studied by means of the Continuous Plankton Recorder (CPR). Using data collected during the years 1962 to 1974, the spatial heterogeneity of long-term trends is studied by numerical analysis: Mantel test, Mantel correlogram, and spatio-temporal clustering. Results reveal that (1) interannual changes of C. finmarchicus abundance are spatially autocorrelated; (2) the spatial structures have a radius varying between 400 and 1100 km; and (3) there is a high variability in the annual changes observed between the different zones detected by clustering. These results show that observations made in the Northeast Atlantic cannot be extrapolated to the whole North... |
| Tipo: Text |
Palavras-chave: North Atlantic; Calanus finmarchicus; Long-term changes; Space-time interactions; Continuous Plankton Recorder. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20388/18055.pdf |
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| Planque, Benjamin; Mullon, Christian. |
| Nearly 30 years ago, emerged the concept of deterministic chaos. With it came sensitivity to initial conditions, nonlinearities, and strange attractors. This constituted a paradigm shift that profoundly altered how numerical modellers approached dynamic systems. It also provided an opportunity to resolve a situation of mutual misunderstanding between scientists and non-scientists about uncertainties and predictability in natural systems. Our proposition is that this issue can be addressed in an original way which involves modelling based on the principles of chance and necessity (CaN). We outline the conceptual and mathematical principles of CaN models and present an application of the model to the Barents Sea food-web. Because CaN models rely on concepts... |
| Tipo: Text |
Palavras-chave: Chaos theory; Constraints; Nonlinear systems; Participatory modelling; Uncertainty; Viability theory. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00585/69686/67759.pdf |
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| Planque, Benjamin; Bellier, Edwige; Lazure, Pascal. |
| Large amplitude variations in recruitment of small pelagic fish result from interactions between a fluctuating environment and population dynamics processes such as spawning. The spatial extent and location of spawning, which is critical to the fate of eggs and larvae, can vary strongly from year to year, as a result of changing population structure and environmental conditions. Spawning habitat can be divided into 'potential spawning habitat', defined as habitat where the hydrographic conditions are suitable for spawning, 'realized spawning habitat', defined as habitat where spawning actually occurs, and 'successful spawning habitat', defined as habitat from where successful recruitment has resulted. Using biological data collected during the period... |
| Tipo: Text |
Palavras-chave: Sardine; Potential spawning habitat; Generalized additive models; Environmental effects; Bay of Biscay; Anchovy. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2180.pdf |
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| Perry, R. Ian; Cury, Philippe; Brander, Keith; Jennings, Simon; Moellmann, Christian; Planque, Benjamin. |
| Modern fisheries research and management must understand and take account of the interactions between climate and fishing, rather than try to disentangle their effects and address each separately. These interactions are significant drivers of change in exploited marine systems and have ramifications for ecosystems and those who depend on the services they provide. We discuss how fishing and climate forcing interact on individual fish, marine populations, marine communities, and ecosystems to bring these levels into states that are more sensitive to (i.e. more strongly related with) climate forcing. Fishing is unlikely to alter the sensitivities of individual finfish and invertebrates to climate forcing. It will remove individuals with specific... |
| Tipo: Text |
Palavras-chave: Climate variability; Climate change; Communities; Ecosystems; Fisheries management; Fishing; Populations. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00000/11141/9343.pdf |
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| Loots, Christophe; Vaz, Sandrine; Planque, Benjamin; Koubbi, Philippe. |
| The spatial distributions of spawning population of North Sea plaice and whiting were studied using geostatistical analyses. Variograms were computed each year since 1980 on abundance data of spawning adults using the first quarter data from the International Bottom Trawl Survey. Maps of spatial distribution of spawning adults were produced using kriging interpolation. For both species, distributions of spawning adults were in agreement with historical spawning grounds previously described from location of their eggs. This showed that spawning adults distribution may be used to infer the distribution of both plaice during its spawning peak and whiting at the beginning of its spawning period. Both species were strongly spatially structured with abundances... |
| Tipo: Text |
Palavras-chave: Spatial distribution; Plaice; Whiting; North Sea; Inter-annual variability; Spawning adults. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00022/13317/11191.pdf |
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| 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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| Registros recuperados: 26 | |
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