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Jean‐Noël Druon; Didier Gascuel; Maurizio Gibin; Antonella Zanzi; Jean‐Marc Fromentin; Francesco Colloca; Pierre Hélaouët; Marta Coll; Alessandro Mannini; Joanna K Bluemel; Chiara Piroddi; Francois Bastardie; Diego Macias‐Moy; Paraskevas Vasilakopoulos; Henning Winker; Natalia Serpetti; Jordi Guillen; Andreas Palialexis; Michaël Gras; Zeynep Hekim; Laurent Dubroca; Cecilia Pinto; Jeroen Steenbeek; Jann Martinsohn. Mesoscale productivity fronts and local fishing opportunities in the European Seas. Fish and Fisheries 2021, 1 .
AMA StyleJean‐Noël Druon, Didier Gascuel, Maurizio Gibin, Antonella Zanzi, Jean‐Marc Fromentin, Francesco Colloca, Pierre Hélaouët, Marta Coll, Alessandro Mannini, Joanna K Bluemel, Chiara Piroddi, Francois Bastardie, Diego Macias‐Moy, Paraskevas Vasilakopoulos, Henning Winker, Natalia Serpetti, Jordi Guillen, Andreas Palialexis, Michaël Gras, Zeynep Hekim, Laurent Dubroca, Cecilia Pinto, Jeroen Steenbeek, Jann Martinsohn. Mesoscale productivity fronts and local fishing opportunities in the European Seas. Fish and Fisheries. 2021; ():1.
Chicago/Turabian StyleJean‐Noël Druon; Didier Gascuel; Maurizio Gibin; Antonella Zanzi; Jean‐Marc Fromentin; Francesco Colloca; Pierre Hélaouët; Marta Coll; Alessandro Mannini; Joanna K Bluemel; Chiara Piroddi; Francois Bastardie; Diego Macias‐Moy; Paraskevas Vasilakopoulos; Henning Winker; Natalia Serpetti; Jordi Guillen; Andreas Palialexis; Michaël Gras; Zeynep Hekim; Laurent Dubroca; Cecilia Pinto; Jeroen Steenbeek; Jann Martinsohn. 2021. "Mesoscale productivity fronts and local fishing opportunities in the European Seas." Fish and Fisheries , no. : 1.
An increasing number of studies have been examining the functional configuration of biological communities or ecosystems using biological traits. Here, we investigate the temporal dynamics and resilience of the trait composition in Mediterranean fisheries landings over 31 years (1985-2015). We transcribed the FAO Mediterranean landings dataset for 101 marine species into a dataset of 23 traits related to the life cycle, distribution, ecology and behaviour. Mediterranean mean Sea Surface Temperature (SST) was evaluated as a potential driver of the trait composition. Trait dynamics were evaluated both individually and holistically by developing an Integrated Traits Resilience Assessment (ITRA). ITRA is a variation of the Integrated Resilience Assessment (IRA), a method to infer resilience dynamics and build stability landscapes of complex natural systems. Changes in landings trait dynamics were documented both for individual traits and for the entire traits “system”, and a relevant regime shift was detected in the second half of the 1990s. The traits system switched to higher optimal temperature, more summer spawning, shorter life span, smaller maximum size, shallower optimal depth and planktivorous diet. This shift was found to be a lagged discontinuous response to sea warming, which gradually eroded the resilience of the original state of the traits system, leading it into a new basin of attraction. The inclusion of ecological/response traits (related to environmental preferences) in our analyses indicates potential mechanisms that explain the observed shift, while changes of functional/effect traits indicate potential impacts on ecosystem functioning. Our findings suggest that changes in the Mediterranean ecosystems are evidently larger than previously thought, with profound implications for the management of this highly impacted sea.
Eleni Tsimara; Paraskevas Vasilakopoulos; Martha Koutsidi; Dionysios E. Raitsos; Alexis Lazaris; Evangelos Tzanatos. An Integrated Traits Resilience Assessment of Mediterranean fisheries landings. Journal of Animal Ecology 2021, 1 .
AMA StyleEleni Tsimara, Paraskevas Vasilakopoulos, Martha Koutsidi, Dionysios E. Raitsos, Alexis Lazaris, Evangelos Tzanatos. An Integrated Traits Resilience Assessment of Mediterranean fisheries landings. Journal of Animal Ecology. 2021; ():1.
Chicago/Turabian StyleEleni Tsimara; Paraskevas Vasilakopoulos; Martha Koutsidi; Dionysios E. Raitsos; Alexis Lazaris; Evangelos Tzanatos. 2021. "An Integrated Traits Resilience Assessment of Mediterranean fisheries landings." Journal of Animal Ecology , no. : 1.
Marine biota are redistributing at a rapid pace in response to climate change and shifting seascapes. While changes in fish populations and community structure threaten the sustainability of fisheries, our capacity to adapt by tracking and projecting marine species remains a challenge due to data discontinuities in biological observations, lack of data availability, and mismatch between data and real species distributions. To assess the extent of this challenge, we review the global status and accessibility of ongoing scientific bottom trawl surveys. In total, we gathered metadata for 283,925 samples from 95 surveys conducted regularly from 2001 to 2019. We identified that 59% of the metadata collected are not publicly available, highlighting that the availability of data is the most important challenge to assess species redistributions under global climate change. Given that the primary purpose of surveys is to provide independent data to inform stock assessment of commercially important populations, we further highlight that single surveys do not cover the full range of the main commercial demersal fish species. An average of 18 surveys is needed to cover at least 50% of species ranges, demonstrating the importance of combining multiple surveys to evaluate species range shifts. We assess the potential for combining surveys to track transboundary species redistributions and show that differences in sampling schemes and inconsistency in sampling can be overcome with spatio‐temporal modeling to follow species density redistributions. In light of our global assessment, we establish a framework for improving the management and conservation of transboundary and migrating marine demersal species. We provide directions to improve data availability and encourage countries to share survey data, to assess species vulnerabilities, and to support management adaptation in a time of climate‐driven ocean changes.
Aurore Maureaud; Romain Frelat; Laurène Pécuchet; Nancy Shackell; Bastien Mérigot; Malin L. Pinsky; Kofi Amador; Sean C. Anderson; Alexander Arkhipkin; Arnaud Auber; Iça Barri; Richard J. Bell; Jonathan Belmaker; Esther Beukhof; Mohamed Lamine Camara; Renato Guevara‐Carrasco; Junghwa Choi; Helle Torp Christensen; Jason Conner; Luis A. Cubillos; Hamet Diaw Diadhiou; Dori Edelist; Margrete Emblemsvåg; Billy Ernst; Tracey P. Fairweather; Heino O. Fock; Kevin D. Friedland; Camilo B. Garcia; Didier Gascuel; Henrik Gislason; Menachem Goren; Jérôme Guitton; Didier Jouffre; Tarek Hattab; Manuel Hidalgo; Johannes N. Kathena; Ian Knuckey; Saïkou Oumar Kidé; Mariano Koen‐Alonso; Matt Koopman; Vladimir Kulik; Jacqueline Palacios León; Ya’Arit Levitt‐Barmats; Martin Lindegren; Marcos Llope; Félix Massiot‐Granier; Hicham Masski; Matthew McLean; Beyah Meissa; Laurène Mérillet; Vesselina Mihneva; Francis K. E. Nunoo; Richard O'Driscoll; Cecilia A. O'Leary; Elitsa Petrova; Jorge E. Ramos; Wahid Refes; Esther Román‐Marcote; Helle Siegstad; Ignacio Sobrino; Jón Sólmundsson; Oren Sonin; Ingrid Spies; Petur Steingrund; Fabrice Stephenson; Nir Stern; Feriha Tserkova; Georges Tserpes; Evangelos Tzanatos; Itai van Rijn; Paul A.M. van Zwieten; Paraskevas Vasilakopoulos; Daniela V. Yepsen; Philippe Ziegler; James Thorson. Are we ready to track climate‐driven shifts in marine species across international boundaries? ‐ A global survey of scientific bottom trawl data. Global Change Biology 2020, 27, 220 -236.
AMA StyleAurore Maureaud, Romain Frelat, Laurène Pécuchet, Nancy Shackell, Bastien Mérigot, Malin L. Pinsky, Kofi Amador, Sean C. Anderson, Alexander Arkhipkin, Arnaud Auber, Iça Barri, Richard J. Bell, Jonathan Belmaker, Esther Beukhof, Mohamed Lamine Camara, Renato Guevara‐Carrasco, Junghwa Choi, Helle Torp Christensen, Jason Conner, Luis A. Cubillos, Hamet Diaw Diadhiou, Dori Edelist, Margrete Emblemsvåg, Billy Ernst, Tracey P. Fairweather, Heino O. Fock, Kevin D. Friedland, Camilo B. Garcia, Didier Gascuel, Henrik Gislason, Menachem Goren, Jérôme Guitton, Didier Jouffre, Tarek Hattab, Manuel Hidalgo, Johannes N. Kathena, Ian Knuckey, Saïkou Oumar Kidé, Mariano Koen‐Alonso, Matt Koopman, Vladimir Kulik, Jacqueline Palacios León, Ya’Arit Levitt‐Barmats, Martin Lindegren, Marcos Llope, Félix Massiot‐Granier, Hicham Masski, Matthew McLean, Beyah Meissa, Laurène Mérillet, Vesselina Mihneva, Francis K. E. Nunoo, Richard O'Driscoll, Cecilia A. O'Leary, Elitsa Petrova, Jorge E. Ramos, Wahid Refes, Esther Román‐Marcote, Helle Siegstad, Ignacio Sobrino, Jón Sólmundsson, Oren Sonin, Ingrid Spies, Petur Steingrund, Fabrice Stephenson, Nir Stern, Feriha Tserkova, Georges Tserpes, Evangelos Tzanatos, Itai van Rijn, Paul A.M. van Zwieten, Paraskevas Vasilakopoulos, Daniela V. Yepsen, Philippe Ziegler, James Thorson. Are we ready to track climate‐driven shifts in marine species across international boundaries? ‐ A global survey of scientific bottom trawl data. Global Change Biology. 2020; 27 (2):220-236.
Chicago/Turabian StyleAurore Maureaud; Romain Frelat; Laurène Pécuchet; Nancy Shackell; Bastien Mérigot; Malin L. Pinsky; Kofi Amador; Sean C. Anderson; Alexander Arkhipkin; Arnaud Auber; Iça Barri; Richard J. Bell; Jonathan Belmaker; Esther Beukhof; Mohamed Lamine Camara; Renato Guevara‐Carrasco; Junghwa Choi; Helle Torp Christensen; Jason Conner; Luis A. Cubillos; Hamet Diaw Diadhiou; Dori Edelist; Margrete Emblemsvåg; Billy Ernst; Tracey P. Fairweather; Heino O. Fock; Kevin D. Friedland; Camilo B. Garcia; Didier Gascuel; Henrik Gislason; Menachem Goren; Jérôme Guitton; Didier Jouffre; Tarek Hattab; Manuel Hidalgo; Johannes N. Kathena; Ian Knuckey; Saïkou Oumar Kidé; Mariano Koen‐Alonso; Matt Koopman; Vladimir Kulik; Jacqueline Palacios León; Ya’Arit Levitt‐Barmats; Martin Lindegren; Marcos Llope; Félix Massiot‐Granier; Hicham Masski; Matthew McLean; Beyah Meissa; Laurène Mérillet; Vesselina Mihneva; Francis K. E. Nunoo; Richard O'Driscoll; Cecilia A. O'Leary; Elitsa Petrova; Jorge E. Ramos; Wahid Refes; Esther Román‐Marcote; Helle Siegstad; Ignacio Sobrino; Jón Sólmundsson; Oren Sonin; Ingrid Spies; Petur Steingrund; Fabrice Stephenson; Nir Stern; Feriha Tserkova; Georges Tserpes; Evangelos Tzanatos; Itai van Rijn; Paul A.M. van Zwieten; Paraskevas Vasilakopoulos; Daniela V. Yepsen; Philippe Ziegler; James Thorson. 2020. "Are we ready to track climate‐driven shifts in marine species across international boundaries? ‐ A global survey of scientific bottom trawl data." Global Change Biology 27, no. 2: 220-236.
There are uncertainties associated with every phase of the stock assessment process, ranging from the collection of data, assessment model choice, model assumptions and interpretation of risk to the implementation of management advice. The dynamics of fish populations are complex, and our incomplete understanding of those dynamics (and limited observations of important mechanisms) necessitate that models are simpler than nature. The aim is for the model to capture enough of the dynamics to accurately estimate trends and abundance and to provide advice to managers about sustainable harvests. The \textit{status quo} approach to assessment modelling has been to identify the `best' model, based on diagnostics and model selection criteria, and to generate advice from that model, mostly ignoring advice from other model configurations regardless of how closely they performed relative to the chosen model. We review the suitability of the ensemble modelling paradigm to more fully capture uncertainty in stock assessment model building and the provision of advice. We recommend further research to evaluate potential gains in modelling performance and advice from the use of ensemble modelling, while also suggesting revisions to the formal process for reviewing models and providing advice to management bodies.
Ernesto Jardim; Manuela Azevedo; Jon Brodziak; Elizabeth N. Brooks; Kelli F. Johnson; Nikolai Klibansky; Colin P. Millar; Coilin Minto; Iago Mosqueira; Richard D.M. Nash; Paris Vasilakopoulos; Brian K. Wells. Operationalizing Ensemble Models for Scientific Advice to Fisheries Management. 2020, 1 .
AMA StyleErnesto Jardim, Manuela Azevedo, Jon Brodziak, Elizabeth N. Brooks, Kelli F. Johnson, Nikolai Klibansky, Colin P. Millar, Coilin Minto, Iago Mosqueira, Richard D.M. Nash, Paris Vasilakopoulos, Brian K. Wells. Operationalizing Ensemble Models for Scientific Advice to Fisheries Management. . 2020; ():1.
Chicago/Turabian StyleErnesto Jardim; Manuela Azevedo; Jon Brodziak; Elizabeth N. Brooks; Kelli F. Johnson; Nikolai Klibansky; Colin P. Millar; Coilin Minto; Iago Mosqueira; Richard D.M. Nash; Paris Vasilakopoulos; Brian K. Wells. 2020. "Operationalizing Ensemble Models for Scientific Advice to Fisheries Management." , no. : 1.
Fisheries management typically aims at controlling exploitation rate (e.g., Fbar) to ensure sustainable levels of stock size in accordance with established reference points (e.g., FMSY, BMSY). Population selectivity (“selectivity” hereafter), that is the distribution of fishing mortality over the different demographic components of an exploited fish stock, is also important because it affects both Maximum Sustainable Yield (MSY) and FMSY, as well as stock resilience to overfishing. The development of an appropriate metric could make selectivity operational as an additional lever for fisheries managers to achieve desirable outcomes. Additionally, such a selectivity metric could inform managers on the uptake by fleets and effects on stocks of various technical measures. Here, we introduce three criteria for selectivity metrics: (a) sensitivity to selectivity changes, (b) robustness to recruitment variability and (c) robustness to changes in Fbar. Subsequently, we test a range of different selectivity metrics against these three criteria to identify the optimal metric. First, we simulate changes in selectivity, recruitment and Fbar on a virtual fish stock to study the metrics under controlled conditions. We then apply two shortlisted selectivity metrics to six European fish stocks with a known history of technical measures to explore the metrics’ response in real‐world situations. This process identified the ratio of F of the first recruited age–class to Fbar (Frec/Fbar) as an informative selectivity metric for fisheries management and advice.
Paraskevas Vasilakopoulos; Ernesto Jardim; Christoph Konrad; Dominic Rihan; Alessandro Mannini; Cecilia Pinto; John Casey; Iago Mosqueira; Finbarr G. O’Neill. Selectivity metrics for fisheries management and advice. Fish and Fisheries 2020, 21, 621 -638.
AMA StyleParaskevas Vasilakopoulos, Ernesto Jardim, Christoph Konrad, Dominic Rihan, Alessandro Mannini, Cecilia Pinto, John Casey, Iago Mosqueira, Finbarr G. O’Neill. Selectivity metrics for fisheries management and advice. Fish and Fisheries. 2020; 21 (3):621-638.
Chicago/Turabian StyleParaskevas Vasilakopoulos; Ernesto Jardim; Christoph Konrad; Dominic Rihan; Alessandro Mannini; Cecilia Pinto; John Casey; Iago Mosqueira; Finbarr G. O’Neill. 2020. "Selectivity metrics for fisheries management and advice." Fish and Fisheries 21, no. 3: 621-638.
Discarding is a common practice in fisheries. Total discards are estimated to be about 30 million tons, representing around 23% of worldwide catches. Discarding is an undesirable practice, not only because of the waste of resources, but also because of its contribution to the overexploitation of fish stocks. Several countries have already established discard bans, to different extents (e.g., Norway, Iceland, Chile, New Zealand). The EU’s landing obligation (discard ban) is a major measure of the latest reform of the Common Fisheries Policy for EU fisheries. It aims to reduce unwanted catches in EU fisheries, by incentivizing improved selectivity and restoring fish stocks to levels that can sustain the maximum production over time without harming the biodiversity and the capacity of future generations to obtain fish. However, banning discards will inevitably induce diverse short- and long-term ecological, economic, and social impacts, which may determine whether the landing obligation’s objectives will be achieved.
Jordi Guillen; Steven J. Holmes; Natacha Carvalho; John Casey; Hendrik Dörner; Maurizio Gibin; Alessandro Mannini; Paraskevas Vasilakopoulos; Antonella Zanzi. A Review of the European Union Landing Obligation Focusing on Its Implications for Fisheries and the Environment. Sustainability 2018, 10, 900 .
AMA StyleJordi Guillen, Steven J. Holmes, Natacha Carvalho, John Casey, Hendrik Dörner, Maurizio Gibin, Alessandro Mannini, Paraskevas Vasilakopoulos, Antonella Zanzi. A Review of the European Union Landing Obligation Focusing on Its Implications for Fisheries and the Environment. Sustainability. 2018; 10 (4):900.
Chicago/Turabian StyleJordi Guillen; Steven J. Holmes; Natacha Carvalho; John Casey; Hendrik Dörner; Maurizio Gibin; Alessandro Mannini; Paraskevas Vasilakopoulos; Antonella Zanzi. 2018. "A Review of the European Union Landing Obligation Focusing on Its Implications for Fisheries and the Environment." Sustainability 10, no. 4: 900.