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Auteur LAGABRIELLE, E.; CROCHELET, E.; ANDRELLO, M.; SCHILL, S.R.; ARNAUD-HAOND, S.; ALLONCLE, N.; PONGE, B.
Titre Connecting MPAs – eight challenges for science and management Type Article scientifique
Année 2014 Publication Revue Abrégée (up) Aquatic Conservation-marine And Freshwater Ecosystems
Volume 24 Numéro Pages 94-110
Mots-Clés coastal; conservation evaluation; Fishing; Marine Protected Areas; ocean; spatial modelling
Résumé Connectivity is a crucial process underpinning the persistence, recovery, and productivity of marine ecosystems. The Convention on Biological Diversity, through the Aichi Target 11, has set the ambitious objective of implementing a ‘well connected system of protected areas’ by 2020. This paper identifies eight challenges toward the integration of connectivity into MPA network management and planning. A summary table lists the main recommendations in terms of method, tool, advice, or action to address each of these challenges. Authors belong to a science–management continuum including researchers, international NGO officers, and national MPA agency members. Three knowledge challenges are addressed: selecting and integrating connectivity measurement metrics; assessing the accuracy and uncertainty of connectivity measurements; and communicating and visualizing connectivity measurements. Three management challenges are described: integrating connectivity into the planning and management of MPA networks; setting quantitative connectivity targets; and implementing connectivity-based management across scales and marine jurisdictions. Finally, two paths toward a better integration of connectivity science with MPA management are proposed: setting management-driven priorities for connectivity research, bridging connectivity science, and MPA network management. There is no single method to integrate connectivity into marine spatial planning. Rather, an array of methods can be assembled according to the MPA network objectives, budget, available skills, data, and timeframe. Overall, setting up ‘boundary organizations’ should be promoted to organize complex cross-disciplinary, cross-sectoral and cross-jurisdiction interactions that are needed between scientists, managers, stakeholders and decision-makers to make informed decision regarding connectivity-based MPA planning and management.
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Volume de collection Numéro de collection Edition
ISSN 1052-7613 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1133
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Auteur Cheng, L.; Blanchet, S.; Loot, G.; Villeger, S.; Zhang, T.; Lek, S.; Lek-Ang, S.; Li, Z.
Titre Temporal changes in the taxonomic and functional diversity of fish communities in shallow Chinese lakes: the effects of river–lake connections and aquaculture Type Article scientifique
Année 2014 Publication Revue Abrégée (up) Aquatic Conservation: Marine and Freshwater Ecosystems
Volume 24 Numéro 1 Pages 23-34
Mots-Clés biodiversity loss; biotic homogenization; Functional richness; lakes; Yangtze River basin
Résumé
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Volume de collection Numéro de collection Edition
ISSN 1099-0755 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1160
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Auteur Moreau, S.; Mostajir, B.; Almandoz, G.O.; Demers, S.; Hernando, M.; Lemarchand, K.; Lionard, M.; Mercier, B.; Roy, S.; Schloss, I.R.; Thyssen, M.; Ferreyra, G.A.
Titre Effects of enhanced temperature and ultraviolet B radiation on a natural plankton community of the Beagle Channel (southern Argentina): a mesocosm study Type Article scientifique
Année 2014 Publication Revue Abrégée (up) Aquatic Microbial Ecology
Volume 72 Numéro 2 Pages 155-173
Mots-Clés
Résumé ABSTRACT: Marine planktonic communities can be affected by increased temperatures associated with global climate change, as well as by increased ultraviolet B radiation (UVBR, 280-320 nm) through stratospheric ozone layer thinning. We studied individual and combined effects of increased temperature and UVBR on the plankton community of the Beagle Channel, southern Patagonia, Argentina. Eight 2 m3 mesocosms were exposed to 4 treatments (with 2 replicates) during 10 d: (1) control (natural temperature and UVBR), (2) increased UVBR (simulating a 60% decrease in stratospheric ozone layer thickness), (3) increased temperature (+ 3°C), and (4) simultaneous increased temperature and UVBR (60% decrease in stratospheric ozone; + 3°C). Two distinct situations were observed with regard to phytoplankton biomass: bloom (Days 1-4) and post-bloom (Days 5-9). Significant decreases in micro-sized diatoms (>20 µm), bacteria, chlorophyll a, and particulate organic carbon concentrations were observed during the post-bloom in the enhanced temperature treatments relative to natural temperature, accompanied by significant increases in nanophytoplankton (10-20 µm, mainly prymnesiophytes). The decrease in micro-sized diatoms in the high temperature treatment may have been caused by a physiological effect of warming, although we do not have activity measurements to support this hypothesis. Prymnesiophytes benefited from micro-sized diatom reduction in their competition for resources. The bacterial decrease under warming may have been due to a change in the dissolved organic matter release caused by the observed change in phytoplankton composition. Overall, the rise in temperature affected the structure and total biomass of the communities, while no major effect of UVBR was observed on the plankton community.
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 555
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Auteur Thiebault, A.; Mullers, R.H.E.; Pistorius, P.A.; Tremblay, Y.
Titre Local enhancement in a seabird: reaction distances and foraging consequence of predator aggregations Type Article scientifique
Année 2014 Publication Revue Abrégée (up) Behavioral Ecology
Volume 25 Numéro 6 Pages 1302-1310
Mots-Clés camera; foraging cues; gannet; Gps; group hunting; network foraging; prey detection; social information.
Résumé Seabirds foraging on pelagic fish develop behavioral strategies specifically adapted to locate inconspicuous prey that are aggregated in spatially dynamic patches. In the marine environment, they may use various mechanisms to detect cues of prey availability. The aggregation of predators at a patch of food is a particularly obvious cue to locate prey, a mechanism known as local enhancement. Pioneering studies described the formation of foraging groups at sea, showing that seabirds are attracted to feeding conspecifics. Improved foraging success due to local enhancement has been suggested from modeling studies, but no direct validation of these results exists. We deployed video cameras concomitantly with GPS loggers on Cape gannets to study the behavioral responses of equipped birds to the aggregation of predators at food patches. We showed that the reaction distances of equipped birds increased with the size of an aggregation, demonstrating that predator aggregations enhance food detectability for foragers. For small aggregations (<50 gannets), reaction distances were mostly less than 10 km, and they increased up to almost 40 km for larger aggregations (100–150 gannets). In addition, we showed that the number and frequency of dives increased with the number of conspecifics aggregated, up to a threshold. The predator aggregations on a patch of food could, therefore, not only inform about the presence of prey but also entail information about foraging conditions. From direct observations on the various components involved, our study provides justification of the use and advantages of local enhancement in foraging seabirds.
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ISSN 1045-2249, 1465-7279 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1207
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Auteur Torres-Irineo, E.; Amandè, M.J.; Gaertner, D.; Delgado de Molina, A.; Murua, H.; Chavance, P.; Ariz, J.; Ruiz, J.; Lezama-Ochoa, N.
Titre Bycatch species composition over time by tuna purse-seine fishery in the eastern tropical Atlantic Ocean Type Article scientifique
Année 2014 Publication Revue Abrégée (up) Biodiversity and Conservation
Volume 23 Numéro 5 Pages 1157-1173
Mots-Clés
Résumé Within the Ecosystem-based fisheries management framework, we evaluated

the changes over time in bycatch species of the European tuna purse-seine fishery operating

in the eastern Atlantic Ocean. Bycatch data was collected during two scientific

observer programs conducted in the late 1990s and in the late 2000s. Over these two time

periods, we compared the temporal trends in bycatch species composition, the probability

of occurrence of functional groups per fishing set, the spatio-temporal species richness and

the potential impact on several species listed in the red list of the International Union for

Conservation of Nature (IUCN). The analyses were performed separately on the two main

fishing modes of the fleet, i.e. sets on free-swimming school sets and on fish aggregating

devices (FADs). Owing data quality constraints, we did not estimate bycatch rates. Ours

results showed that the species composition of sharks caught on FADs decreased over time.

The total species richness was higher for FAD sets than for free-swimming school sets (87

vs. 61 species respectively), such difference is common between fishing modes worldwide.
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Langue eng Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0960-3115 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 1546
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