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Auteur Bitetto, I.; Romagnoni, G.; Adamidou, A.; Certain, G.; Di Lorenzo, M.; Donnaloia, M.; Lembo, G.; Maiorano, P.; Milisenda, G.; Musumeci, C.; Ordines, F.; Pesci, P.; Peristeraki, P.; Pesic, A.; Sartor, P.; Spedicato, M.T.
Titre Modelling spatio-temporal patterns of fish community size structure across the northern Mediterranean Sea: an analysis combining MEDITS survey data with environmental and anthropogenic drivers Type Article scientifique
Année 2019 Publication Revue Abrégée Sci. Mar.
Volume 83 Numéro Pages 141-151
Mots-Clés demersal fish community; dynamic factor analysis; ecological indicators; geographical sub-area; impact; management; marine; Marine Strategy Framework Directive; redundancy analysis; size structure indicators; specificity; trends
Résumé The state of marine systems subject to natural or anthropogenic impacts can be generally summarized by suites of ecological indicators carefully selected to avoid redundancy. Length-based indicators capture the status of fish community structure, fulfilling the Marine Strategy Framework Directive (MSFD) requirement for Descriptor 3 (status of commercial fish species). Although the MSFD recommends the development of regional indicators, a comparison among alternative length-based indicators is so far missing for the Mediterranean Sea. Using principal component analysis and dynamic factor analysis, we identified the most effective subset of length-based indicators, whether or not based on maximum length. Indicator trends and lime series of fishing effort and environmental variables are also compared in order to highlight the individual and combined capability of indicators to track system changes across geographical sub-areas. Two indicators, typical length and mean maximum length, constitute the smallest set of non-redundant indicators, capturing together 87.45% of variability. Only in combination can these indicators disentangle changes in the fish community composition from modifications of size structure. Our study supports the inclusion of typical length among the regional MSFD Descriptor 3 indicators for the Mediterranean Sea. Finally, we show dissimilarity between the western and eastern-central Mediterranean, suggesting that there are sub-regional differences in stressors and community responses.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0214-8358 ISBN Médium
Région Expédition Conférence
Notes WOS:000504829900011 Approuvé pas de
Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2696
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Auteur Blanchard, J.L.; Coll, M.; Trenkel, V.M.; Vergnon, R.; Yemane, D.; Jouffre, D.; Link, J.S.; Shin, Y.-J.
Titre Trend analysis of indicators : a comparison of recent changes in the status of marine ecosystems around the world Type Article scientifique
Année 2010 Publication Revue Abrégée Ices Journal of Marine Science
Volume 67 Numéro 4 Pages 732-744
Mots-Clés community; ecological indicators; ecosystem-based fisheries management; ecosystem effects of fishing; natural resource management
Résumé Blanchard, J. L., Coll, M., Trenkel, V. M., Vergnon, R., Yemane, D., Jouffre, D., Link, J. S., and Shin, Y-J. 2010. Trend analysis of indicators: a comparison of recent changes in the status of marine ecosystems around the world. – ICES Journal of Marine Science, 67: 732-744.
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Editeur Lieu de Publication Éditeur
Langue Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 1054-3139 ISBN Médium
Région Expédition Conférence
Notes Approuvé pas de
Numéro d'Appel LL @ pixluser @ collection 58
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Auteur Coll, M.; Shannon, L.J.; Kleisner, K.M.; Juan-Jordá, M.J.; Bundy, A.; Akoglu, A.G.; Banaru, D.; 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, M.; Tsagarakis, K.; Tuck, I.; van der Meeren, G.I.; Yemane, D.; Zador, S.G.; Shin, Y.-J.
Titre Ecological indicators to capture the effects of fishing on biodiversity and conservation status of marine ecosystems Type Article scientifique
Année 2016 Publication Revue Abrégée Ecological Indicators
Volume 60 Numéro Pages 947-962
Mots-Clés Biodiversity; Conservation; Ecological indicators; Fishing impacts; Marine ecosystems; Redundancy; States; Trends
Résumé 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 of under and moderately exploited stocks, (vi) total biomass of surveyed species, and (vii) mean trophic level of the landed catch. In line with the Nagoya Strategic Plan of the Convention on Biological Diversity (2011–2020), we extended this suite to emphasize the broader biodiversity and conservation risks in exploited marine ecosystems. We selected a subset of indicators from a list of empirically based candidate biodiversity indicators initially established based on ecological significance to complement the original IndiSeas indicators. The additional selected indicators were: (viii) mean intrinsic vulnerability index of the fish landed catch, (ix) proportion of non-declining exploited species in the surveyed community, (x) catch-based marine trophic index, and (xi) mean trophic level of the surveyed community. Despite the lack of data in some ecosystems, we also selected (xii) mean trophic level of the modelled community, and (xiii) proportion of discards in the fishery as extra indicators. These additional indicators were examined, along with the initial set of IndiSeas ecological indicators, to evaluate whether adding new biodiversity indicators provided useful additional information to refine our understanding of the status evaluation of 29 exploited marine ecosystems. We used state and trend analyses, and we performed correlation, redundancy and multivariate tests. Existing developments in ecosystem-based fisheries management have largely focused on exploited species. Our study, using mostly fisheries independent survey-based indicators, highlights that biodiversity and conservation-based indicators are complementary to ecological indicators of fishing pressure. Thus, they should be used to provide additional information to evaluate the overall impact of fishing on exploited marine ecosystems.
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Volume de collection Numéro de collection Edition
ISSN 1470-160x ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1467
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Auteur Eddy, T.D.; Coll, M.; Fulton, E.A.; Lotze, H.K.
Titre Trade-offs between invertebrate fisheries catches and ecosystem impacts in coastal New Zealand Type Article scientifique
Année 2015 Publication Revue Abrégée ICES J. Mar. Sci.
Volume 72 Numéro 5 Pages 1380-1388
Mots-Clés ecological indicators; Ecopath with Ecosim; ecosystem-based fisheries management; ecosystem effects; fisheries exploitation; low-trophic level fishery
Résumé Invertebrate catches are increasing globally following the depletion of many finfish stocks, yet stock assessments and management plans for invertebrates are limited, as is an understanding of the ecosystem effects of these fisheries. Using an ecosystem modelling approach, we explored the trade-offs between invertebrate catches and their impacts on the associated ecosystem on the south coast of Wellington, New Zealand. We simulated exploitation of lobster (Jasus edwardsii), abalone (Haliotis australis, H. iris), and sea urchin (Evechinus chloroticus) over a range of depletion levels—from no depletion to local extinction—to estimate changes in target catches and associated effects on other species groups, trophic levels, and benthic and pelagic components. Exploitation of lobster showed the strongest ecosystem effects, followed by abalone and urchin. In all three fisheries, the current exploitation rate exceeds that which produces maximum sustainable yield, with considerable ecosystem effects. Interestingly, a reduced exploitation rate is predicted to increase target catches (and catch-per-unit-effort), thereby strongly reducing ecosystem effects, a win–win situation. Our results suggest that invertebrate exploitation clearly influences ecosystem structure and function, yet the direction and magnitude of responses depend on the target group and exploitation rate. An ecosystem-based fisheries management approach that includes the role of invertebrates would improve the conservation and management of invertebrate resources and marine ecosystems on broader scales.
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Volume de collection Numéro de collection Edition
ISSN 1054-3139, 1095-9289 ISBN Médium
Région Expédition Conférence
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1329
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Auteur FU, C.; LARGE, S.; KNIGHT, B.; RICHARDSON, A.J.; BUNDY, A.; REYGONDEAU, G.; BOLDT, J.; VAN DER MEEREN, G.I.; TORRES, M.A.; SOBRINO, I.; AUBER, A.; TRAVERS-TROLET, M.; PIRODDI, C.; DIALLO, I.; JOUFFRE, D.; MENDES, H.; BORGES, M.F.; LYNAM, C.P.; COLL, M.; SHANNON, L.J.; SHIN, Y.-J.
Titre Relationships among fisheries exploitation, environmental conditions, and ecological indicators across a series of marine ecosystems Type Article scientifique
Année 2015 Publication Journal of Marine Systems Revue Abrégée
Volume 148 Numéro Pages 101-111
Mots-Clés ecological indicators; environmental conditions; fisheries exploitation; marine ecosystems; partial least squares path modeling
Résumé Understanding how external pressures impact ecosystem structure and functioning is essential for ecosystem-based approaches to fisheries management. We quantified the relative effects of fisheries exploitation and environmental conditions on ecological indicators derived from two different data sources, fisheries catch data (catch-based) and fisheries independent survey data (survey-based) for 12 marine ecosystems using a partial least squares path modeling approach (PLS-PM). We linked these ecological indicators to the total biomass of the ecosystem. Although the effects of exploitation and environmental conditions differed across the ecosystems, some general results can be drawn from the comparative approach. Interestingly, the PLS-PM analyses showed that survey-based indicators were less tightly associated with each other than the catch-based ones. The analyses also showed that the effects of environmental conditions on the ecological indicators were predominantly significant, and tended to be negative, suggesting that in the recent period, indicators accounted for changes in environmental conditions and the changes were more likely to be adverse. Total biomass was associated with fisheries exploitation and environmental conditions; however its association with the ecological indicators was weak across the ecosystems. Knowledge of the relative influence of exploitation and environmental pressures on the dynamics within exploited ecosystems will help us to move towards ecosystem-based approaches to fisheries management. PLS-PM proved to be a useful approach to quantify the relative effects of fisheries exploitation and environmental conditions and suggest it could be used more widely in fisheries oceanography.
Adresse University of Cape Town, Department of Biological Sciences, Ma-Re Marine Research Institute, Private Bag X3, Rondebosch, Cape Town 7701, South Africa
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Editeur Elsevier Lieu de Publication Éditeur
Langue Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0924-7963 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ 36155 collection 1229
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