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Auteur (up) Goetze, J.; Langlois, T.; Claudet, J.; Januchowski-Hartley, F.; Jupiter, S.D.
Titre Periodically harvested closures require full protection of vulnerable species and longer closure periods Type Article scientifique
Année 2016 Publication Revue Abrégée Biol. Conserv.
Volume 203 Numéro Pages 67-74
Mots-Clés areas; biomass; Fiji; Fisheries management; life-history; Locally managed marine areas; Marine conservation; marine reserves; predatory fish; Recovery; reef fish communities; responses; small-scale fisheries; stereo-video; vulnerability
Résumé Periodically harvested closures (PHCs) are small fisheries closures with objectives such as sustaining fisheries and conserving biodiversity and have become one of the most common forms of nearshore marine management in the Western Pacific. Although PHCs can provide both short-term conservation and fisheries benefits, their potential as a long-term management strategy remains unclear. Through empirical assessment of a single harvest event in each of five PHCs, we determined whether targeted fishes that differ in their vulnerability to fishing recovered to pre-harvest conditions (the state prior to last harvest) and demonstrated post-harvest recovery benefits after 1 year of re-closure. For low and moderately vulnerable species, two PHCs provided significant pre-harvest benefits and one provided significant post-harvest recovery benefits, suggesting a contribution to longer-term sustainability. PHCs with a combination of high compliance and longer closing times are more likely to provide fisheries benefits and recover from harvest events, however, no benefits were observed across any PHCs for highly vulnerable species. We recommend PHCs have longer closure periods before being harvested and species that are highly vulnerable to fishing (e.g. large species of; grouper, wrasse and parrotfish) are avoided during harvests to avoid overexploitation and increase the sustainability of small-scale fisheries. (C) 2016 Elsevier Ltd. All rights reserved.
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ISSN 0006-3207 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1695
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Auteur (up) Goetze, J.S.; Claudet, J.; Januchowski-Hartley, F.; Langlois, T.J.; Wilson, S.K.; White, C.; Weeks, R.; Jupiter, S.D.
Titre Demonstrating multiple benefits from periodically harvested fisheries closures Type Article scientifique
Année 2018 Publication Revue Abrégée J. Appl. Ecol.
Volume 55 Numéro 3 Pages 1102-1113
Mots-Clés analytical framework; conservation; coral-reef fishes; customary management; fisheries management; food security; locally managed marine areas; long-term; management; marine protected areas; marine reserve; matter; meta-analysis; metaanalysis; partially protected areas; periodically harvested closures; populations; reserves; small-scale fisheries; video
Résumé 1. Periodically harvested closures (PHCs) are one of the most common forms of fisheries management in Melanesia, demonstrating multiple objectives, including sustaining fish stocks and increasing catch efficiency to support small-scale fisheries. No studies have comprehensively assessed their ability to provide short-term fisheries benefits across the entire harvest regime. 2. We present a novel analytical framework to guide a meta-analysis and assist future research in conceptualizing and assessing the potential of PHCs to deliver benefits for multiple fisheries-related objectives. 3. Ten PHCs met our selection criteria and on average, they provided a 48% greater abundance and 92% greater biomass of targeted fishes compared with areas open to fishing prior to being harvested. 4. This translated into tangible harvest benefits, with fishers removing 21% of the abundance and 49% of the biomass within PHCs, resulting in few post-harvest protection benefits. 5. When PHCs are larger, closed for longer periods or well enforced, short-term fisheries benefits are improved. However, an increased availability of fish within PHCs leads to greater removal during harvests. 6. Synthesis and applications. Periodically harvested closures (PHCs) can provide short-term fisheries benefits. Use of the analytical framework presented here will assist in determining long-term fisheries and conservation benefits. We recommend PHCs be closed to fishing for as long as possible, be as large as possible, that compliance be encouraged via community engagement and enforcement, and strict deadlines/goals for harvesting set to prevent overfishing.
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ISSN 0021-8901 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2345
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Auteur (up) Goetze, J.S.; Januchowski-Hartley, F.A.; Claudet, J.; Langlois, T.J.; Wilson, S.K.; Jupiter, S.D.
Titre Fish wariness is a more sensitive indicator to changes in fishing pressure than abundance, length or biomass Type Article scientifique
Année 2017 Publication Revue Abrégée Ecol. Appl.
Volume 27 Numéro 4 Pages 1178-1189
Mots-Clés artisanal fisheries; Catch Efficiency; Compliance; Conservation; coral-reef management; Customary Management; fish behavior; Fisheries management; Flight Initiation Distance; flight initiation distance; indo-pacific; marine protected areas; periodically harvested closures; predatory fish; Recovery; risk-assessment; stereo-video system
Résumé Identifying the most sensitive indicators to changes in fishing pressure is important for accurately detecting impacts. Biomass is thought to be more sensitive than abundance and length, while the wariness of fishes is emerging as a new metric. Periodically harvested closures (PHCs) that involve the opening and closing of an area to fishing are the most common form of fisheries management in the western Pacific. The opening of PHCs to fishing provides a unique opportunity to compare the sensitivity of metrics, such as abundance, length, biomass and wariness, to changes in fishing pressure. Diver-operated stereo video (stereo-DOV) provides data on fish behavior (using a proxy for wariness, minimum approach distance) simultaneous to abundance and length estimates. We assessed the impact of PHC protection and harvesting on the abundance, length, biomass, and wariness of target species using stereo-DOVs. This allowed a comparison of the sensitivity of these metrics to changes in fishing pressure across four PHCs in Fiji, where spearfishing and fish drives are common. Before PHCs were opened to fishing they consistently decreased the wariness of targeted species but were less likely to increase abundance, length, or biomass. Pulse harvesting of PHCs resulted in a rapid increase in the wariness of fishes but inconsistent impacts across the other metrics. Our results suggest that fish wariness is the most sensitive indicator of fishing pressure, followed by biomass, length, and abundance. The collection of behavioral data simultaneously with abundance, length, and biomass estimates using stereo-DOVs offers a cost-effective indicator of protection or rapid increases in fishing pressure. Stereo-DOVs can rapidly provide large amounts of behavioral data from monitoring programs historically focused on estimating abundance and length of fishes, which is not feasible with visual methods.
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ISSN 1051-0761 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2151
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Auteur (up) Grehan, A.J.; Arnaud-Haond, S.; D'Onghia, G.; Savini, A.; Yesson, C.
Titre Towards ecosystem based management and monitoring of the deep Mediterranean, North-East Atlantic and Beyond Type Article scientifique
Année 2017 Publication Revue Abrégée Deep-Sea Res. Part II-Top. Stud. Oceanogr.
Volume 145 Numéro Pages 1-7
Mots-Clés fish; community; ecosystem based management; monitoring; climate change; conservation; fisheries; bering-sea; baltimore; canyons; cold-water coral; deep-water corals; demersal fish; habitat suitability; habitat suitability modelling; litter; norfolk; rockall bank; vulnerable marine ecosystems
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ISSN 0967-0645 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2255
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Auteur (up) Grenie, M.; Mouillot, D.; Villeger, S.; Denelle, P.; Tucker, C.M.; Munoz, F.; Violle, C.
Titre Functional rarity of coral reef fishes at the global scale: Hotspots and challenges for conservation Type Article scientifique
Année 2018 Publication Revue Abrégée Biol. Conserv.
Volume 226 Numéro Pages 288-299
Mots-Clés biodiversity; Biodiversity facet; Coral triangle; diversity; ecology; ecosystem processes; Evolutionary distinctiveness; Functional distinctiveness; Funrar; marine-protected areas; ocean acidification; redundancy; species richness; trait; vulnerability
Résumé Characterizing functional diversity has become central in ecological research and for biodiversity assessment. Understanding the role of species with rare traits, i.e. functionally rare species, in community assembly, ecosystem dynamics and functioning has recently gained momentum. However, functional rarity is still ignored in conservation strategies. Here, we quantified global functional and evolutionary rarity for 2073 species of coral reef fishes and compared the rarity values to IUCN Red List status. Most species were functionally common but geographically rare. However, we found very weak correlation between functional rarity and evolutionary rarity. Functional rarity was highest for species classified as not evaluated or threatened by the IUCN Red List. The location of functional rarity hotspots (Tropical Eastern Pacific) did not match hotspots of species richness and evolutionary distinctiveness (Indo-Australian Archipelago), nor the currently protected areas. We argue that functional rarity should be acknowledged for both species and site prioritization in conservation strategies.
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 0006-3207 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2434
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