The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Lightmart - One of the best experts on this subject based on the ideXlab platform.
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58 Watt 18 Inch Architectural Gooseneck LED Fixture with Wall Mount
2019Co-Authors: LightmartAbstract:Highly versatile architectural grade Gooseneck LED wall mount features a full cutoff making it dark sky friendly.
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82 Watt 18 Inch Architectural Grade Gooseneck LED Fixture with Wall Mount
2019Co-Authors: LightmartAbstract:Highly versatile architectural grade Gooseneck LED wall mount features a full cutoff making it dark sky friendly.
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58 Watt Architectural Gooseneck LED Light Fixture with Single Arm
2019Co-Authors: LightmartAbstract:Highly versatile Gooseneck LED light fixture with single arm features a full cutoff making it dark sky friendly.
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Two 58 Watt 18 Inch Architectural Gooseneck LED Light Fixtures on Double Arm
2019Co-Authors: LightmartAbstract:Highly versatile 58 Watt, 18 Inch diameter Gooseneck LED light fixture with single arm features a full cutoff making it dark sky friendly.
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58 Watt 18 Inch Architectural Gooseneck LED Light Fixture with Single Arm
2019Co-Authors: LightmartAbstract:Highly versatile 58 Watt, 18 Inch diameter Gooseneck LED light fixture with single arm features a full cutoff making it dark sky friendly.
José Luis Acuña - One of the best experts on this subject based on the ideXlab platform.
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Heterogeneous management and conservation perceptions within the Gooseneck barnacle co-management system in Asturias (N. Spain)
Marine Policy, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:Abstract Stakeholders’ perceptions can influence the success of a fishery. It is important to take these perceptions into account when evaluating the development of a management system and its conservation policies. Structured questionnaires were used to determine fishers’ management and conservation perceptions of the Asturian Gooseneck barnacle co-management system. Perceptions were analyzed for the entire fishery and for different socioeconomic factors, these were: location, age, years in the management system, way of access, alternative income sources and income. Fishers’ perceptions varied widely among socioeconomic factors. In fact, a trade-off between management and conservation perceptions was observed for the different categories within each socioeconomic factor, particularly for the years in the management system, location and income factors. Despite the heterogeneity in perceptions, the co-management system has successfully generated a strong conservation ethic in its resource users. Furthermore, as a group, Gooseneck barnacle fishers hold positive perceptions on the performance of the management system. When generating management policies, fisheries’ managers must take the heterogeneity of resource users present in the fishery into account. The Gooseneck barnacle co-management system demonstrates that even within the same fishery there can be multiple paths to sustainability.
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Trends, drivers, and lessons from a long-term data series of the Asturian (northern Spain) Gooseneck barnacle territorial use rights system
Bulletin of Marine Science, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:The Asturian Gooseneck barnacle (Pollicipes pollicipes Gmelin, 1790) fishery has been managed through territorial use rights in fisheries (TURFs) since its inception >20 yrs ago. As part of this agreement, fishers are allotted exclusive extraction rights and active participation in management strategies. In return for these rights, fishers are responsible for gathering data on effort and extraction in the fishery. We used the extensive time-series gathered by the fishers to assess the sustainability of the fishery. Additionally, we used survey techniques to explore the social-ecological drivers of this sustainability. The fishery has succeeded in maintaining or increasing catch per unit effort in all TURFs. Furthermore, the system has received public approval, where 73% of the stakeholders indicated that the only way to maintain a sustainable Gooseneck barnacle fishery in Asturias is through the current management regime. The system has contributed to the sustainability of the fishery via: (1) creating a window of opportunity for management of the resource; (2) the continuous incorporation of scientific information and fishers' knowledge into management frameworks; (3) empowerment of the resource users; (4) embracing adaptive capacity through flexible management guidelines; and (5) matching management scales with the main life-history traits of the species. As in any dynamic system, the Gooseneck barnacle fishery is currently faced with important challenges that might impact its sustainability, indicating that there are no simple recipes for fisheries management. Nonetheless, this system provides a set of basic principles for TURFs, which may be conducive to adaptive and sustainable fisheries.
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Incorporating landscape metrics into invertebrate fisheries management: case study of the Gooseneck barnacle in Asturias (N. Spain)
Ices Journal of Marine Science, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:Abstract Landscape components can affect all the important biological processes of invertebrate populations, including their harvest quality, yet they are rarely considered in fisheries management frameworks. Here, we explore landscape, economic and ecologic variables to demonstrate that landscape metrics can be a valuable component in the management of sessile invertebrate fisheries. We developed a map-derived model that links landscape variables with the quality of a fishing resource, using five topographical variables—coastal convexity, orientation, complexity, exposure, and distance from the coast—all but the latter were tested at 23 different spatial scales. The model was ground-truthed using the case study of the Gooseneck barnacle fishery in Asturias (N. Spain). Distance from the coast, coastal convexity on a scale of 25 km and exposure on a scale of 1 km appear to be driving the quality of the resource. Our model can predict high-quality Gooseneck barnacle fishing zones with 72% accuracy. Moreover, we used a 10-year time-series of Gooseneck barnacle landings and sales to analyse the impact of quality on the fishery. Fishers have a bias towards harvesting high-quality Gooseneck barnacles, which are sold at higher market values. Thus, quality directly affects landings and sales. Our results highlight the interest of incorporating landscape metrics in fisheries management to generate and support spatially explicit conservation and exploitation policies.
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assessing the sustainability and adaptive capacity of the Gooseneck barnacle co management system in asturias n spain
AMBIO: A Journal of the Human Environment, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, José Luis AcuñaAbstract:The Gooseneck barnacle fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems’ sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionally, we used focus groups and questionnaires to determine the response of the system to these three changes. Co-management has succeeded in maintaining or increasing CPUE throughout all management areas and produced stable mean market prices. This was achieved through flexible management policies and adaptive strategies adopted by the fishers, such as increased selectivity and diversification. The analysis of this fishery provides important lessons regarding the need to understand the evolutionary dynamics of co-management and the importance of embracing adaptive capacity.
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co management in europe insights from the Gooseneck barnacle fishery in asturias spain
Marine Policy, 2014Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, Jorge Luis Alcazar, José Luis AcuñaAbstract:In recent years, cooperative management systems have received attention as a means towards sustainable fisheries. Since its inception and for the past 20 years, the Gooseneck barnacle fishery in the coast of Asturias has been co-managed by assigning Territorial User Rights to fishers׳ associations, allowing fishers to participate actively in the management and data gathering processes. Here, 20 years of landings, in-depth interviews and focus groups were used to characterize the emergence and social-ecological properties of the system. The system consists of 7 management areas each one some tens of kilometers long. The incorporation of fishers׳ knowledge has successfully led to within-area fragmentation of the management units down to single rocks as small as 3m long, which are managed according to different protection levels. The system has empowered resource users and provided an opportunity for the use of both scientific information and fishers׳ knowledge to be integrated in management guidelines. Results suggest the adaptive capacity provided by the co-management framework has been essential to manage this heterogeneous fishery. The Gooseneck barnacle fishery and its historical developments illustrate the potential for establishing co-management systems for small-scale fisheries in Europe.
Antonella Rivera - One of the best experts on this subject based on the ideXlab platform.
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Heterogeneous management and conservation perceptions within the Gooseneck barnacle co-management system in Asturias (N. Spain)
Marine Policy, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:Abstract Stakeholders’ perceptions can influence the success of a fishery. It is important to take these perceptions into account when evaluating the development of a management system and its conservation policies. Structured questionnaires were used to determine fishers’ management and conservation perceptions of the Asturian Gooseneck barnacle co-management system. Perceptions were analyzed for the entire fishery and for different socioeconomic factors, these were: location, age, years in the management system, way of access, alternative income sources and income. Fishers’ perceptions varied widely among socioeconomic factors. In fact, a trade-off between management and conservation perceptions was observed for the different categories within each socioeconomic factor, particularly for the years in the management system, location and income factors. Despite the heterogeneity in perceptions, the co-management system has successfully generated a strong conservation ethic in its resource users. Furthermore, as a group, Gooseneck barnacle fishers hold positive perceptions on the performance of the management system. When generating management policies, fisheries’ managers must take the heterogeneity of resource users present in the fishery into account. The Gooseneck barnacle co-management system demonstrates that even within the same fishery there can be multiple paths to sustainability.
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Trends, drivers, and lessons from a long-term data series of the Asturian (northern Spain) Gooseneck barnacle territorial use rights system
Bulletin of Marine Science, 2017Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:The Asturian Gooseneck barnacle (Pollicipes pollicipes Gmelin, 1790) fishery has been managed through territorial use rights in fisheries (TURFs) since its inception >20 yrs ago. As part of this agreement, fishers are allotted exclusive extraction rights and active participation in management strategies. In return for these rights, fishers are responsible for gathering data on effort and extraction in the fishery. We used the extensive time-series gathered by the fishers to assess the sustainability of the fishery. Additionally, we used survey techniques to explore the social-ecological drivers of this sustainability. The fishery has succeeded in maintaining or increasing catch per unit effort in all TURFs. Furthermore, the system has received public approval, where 73% of the stakeholders indicated that the only way to maintain a sustainable Gooseneck barnacle fishery in Asturias is through the current management regime. The system has contributed to the sustainability of the fishery via: (1) creating a window of opportunity for management of the resource; (2) the continuous incorporation of scientific information and fishers' knowledge into management frameworks; (3) empowerment of the resource users; (4) embracing adaptive capacity through flexible management guidelines; and (5) matching management scales with the main life-history traits of the species. As in any dynamic system, the Gooseneck barnacle fishery is currently faced with important challenges that might impact its sustainability, indicating that there are no simple recipes for fisheries management. Nonetheless, this system provides a set of basic principles for TURFs, which may be conducive to adaptive and sustainable fisheries.
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Incorporating landscape metrics into invertebrate fisheries management: case study of the Gooseneck barnacle in Asturias (N. Spain)
Ices Journal of Marine Science, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucía García-flórez, José Luis AcuñaAbstract:Abstract Landscape components can affect all the important biological processes of invertebrate populations, including their harvest quality, yet they are rarely considered in fisheries management frameworks. Here, we explore landscape, economic and ecologic variables to demonstrate that landscape metrics can be a valuable component in the management of sessile invertebrate fisheries. We developed a map-derived model that links landscape variables with the quality of a fishing resource, using five topographical variables—coastal convexity, orientation, complexity, exposure, and distance from the coast—all but the latter were tested at 23 different spatial scales. The model was ground-truthed using the case study of the Gooseneck barnacle fishery in Asturias (N. Spain). Distance from the coast, coastal convexity on a scale of 25 km and exposure on a scale of 1 km appear to be driving the quality of the resource. Our model can predict high-quality Gooseneck barnacle fishing zones with 72% accuracy. Moreover, we used a 10-year time-series of Gooseneck barnacle landings and sales to analyse the impact of quality on the fishery. Fishers have a bias towards harvesting high-quality Gooseneck barnacles, which are sold at higher market values. Thus, quality directly affects landings and sales. Our results highlight the interest of incorporating landscape metrics in fisheries management to generate and support spatially explicit conservation and exploitation policies.
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assessing the sustainability and adaptive capacity of the Gooseneck barnacle co management system in asturias n spain
AMBIO: A Journal of the Human Environment, 2016Co-Authors: Antonella Rivera, Stefan Gelcich, Lucia Garciaflorez, José Luis AcuñaAbstract:The Gooseneck barnacle fishery in Asturias (N. Spain) has undergone three important changes: (1) the early implementation of a co-management system based on Territorial User Rights for Fishing, (2) a change in management measures (due to a decrease in landings), and (3) an economic crisis. This has allowed us to analyze the systems’ sustainability in time through examining five critical variables: landings, effort, catch per unit effort (CPUE), mean market prices, and annual revenue. Additionally, we used focus groups and questionnaires to determine the response of the system to these three changes. Co-management has succeeded in maintaining or increasing CPUE throughout all management areas and produced stable mean market prices. This was achieved through flexible management policies and adaptive strategies adopted by the fishers, such as increased selectivity and diversification. The analysis of this fishery provides important lessons regarding the need to understand the evolutionary dynamics of co-management and the importance of embracing adaptive capacity.
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Sostenibilidad de la pesquería del percebe en Asturias: tendencias, determinantes y lecciones
2015Co-Authors: Antonella RiveraAbstract:The past 50 years have witnessed an exponential increase in fisheries captures, which has lead to the overexploitation of 90% of all fishing stocks. This is mainly attributed to the open-access nature of fisheries, where fishers deplete fishing stocks in order to pursue their own interests. Nevertheless, a paradigm shift is occurring in fisheries management. Fisheries are shifting from the classical top-down approach to bottom-up community efforts. Moreover, humans are no longer seen as the disruptors of the ecosystem but as an essential part of a linked social-ecological system. As part of this paradigm shift strategies like community participation and holistic management approaches have been promoted. Nonetheless, in order to assess the performance of these alternative management strategies real-life experiences must be carefully analyzed. The Asturian Gooseneck barnacle fishery is a unique example of a complex social-ecological system that has been co-managed for the past 20 years. It provides an ideal case study to test the effect of alternative management strategies on the long-term sustainability of the fishery. Here, we have assessed the sustainability of the Asturian Gooseneck barnacle co-management system through time and disentangled some of the key socio-ecologic drivers for its success. First, we analyzed the history of implementation and the socioeconomic characteristics of the Gooseneck barnacle co-management system. Next, we evaluated the effect of larval dispersal and landscape characteristics on the fishery and their management implications. Finally, we assessed how all these components led to a sustainable fishery despite the effect of external and internal feedbacks. The Asturian co-management system is comprised by 7 management areas with heterogeneous socio-economic backgrounds. The incorporation of fishers' knowledge has led to within-area fragmentation of the management units down to single rocks as small as 30 m long, which are managed according to different protection levels. The system has empowered resource users and provided an opportunity for the use of both scientific information and fishers' knowledge to be integrated in management guidelines. 73% of fishers agree that the co-management system is the only way to protect the resource. Our results suggest the adaptive capacity provided by the co-management framework has been essential to manage this heterogeneous fishery. As part of a holistic management approach, life history traits and landscape ecology must be incorporated in management measures. The Gooseneck barnacle is highly affected by its environment; in Asturias the fishery is located at the fringe of an upwelling system, which drives their larval dispersal. Gooseneck barnacles in the Cantabrian Sea have a dispersal distance in the range of 10s of km that matches the scale of the co-management system. Furthermore, there is a positive correlation between catch rates and the intensity of upwelling 4-years before, this corresponds with the time it takes recruits to reach commercial size. Thus, management and conservation strategies in the area should consider the effects of coastal upwelling. The Gooseneck barnacle is also heavily influenced by landscape-metrics. Distance to coast, coastal convexity at a scale of 25 km and wave exposure at a scale of 1 km appear to be driving the quality of the resource. This has severe management implications because fishers are biased towards harvesting high quality Gooseneck barnacles, which are sold at higher market values. Thus, we generated a model that can predict high quality fishing zones with 72% accuracy. These findings stress the importance of incorporating landscape concepts and life history traits in holistic fisheries management. The Asturian Gooseneck barnacle fishery has survived through 3 important changes: implementation of the co-management system, change in management policies and the national economic crisis. Through adaptive strategies, such as increased selectivity, diversification, and flexible management guidelines, co-management has succeeded in maintaining or increasing catch per unit effort throughout all management areas and has allowed stable mean market prices. The Asturian Gooseneck barnacle co-management system provides important lessons on how to embrace adaptive capacity, incorporate scientific and fishers? knowledge in management guidelines, create cross-scale interactions, and empower resource users. The system has achieved sustainability throughout the past 20 years by employing a holistic, adaptive and participatory approach to fisheries management.
Inigo Muxika - One of the best experts on this subject based on the ideXlab platform.
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a system dynamics model for the management of the Gooseneck barnacle pollicipes pollicipes in the marine reserve of gaztelugatxe northern spain
Ecological Modelling, 2006Co-Authors: Juan Bald, Angel Borja, Inigo MuxikaAbstract:The Gooseneck barnacle (Pollicipes pollicipes) is a highly exploited species in Spain and Portugal due to the great commercial demand and the high prices in the market. Due to the inaccessibility of the Gaztelugatxe coastal area (Basque Country, Northern Spain), the Gooseneck barnacle has maintained one of the greatest populations of the Basque coast in this area. Declared as a marine reserve by means of the 229/1998 (Basque Government) Decree, a 2 years moratorium in the Gooseneck shellfishing was established. Facing the possibility of the Gooseneck barnacle fishery opening in the area of the biotope, it was noticed the need for the development of a management tool, capable to think over the different management decisions: from the complete conservation of the system to the sustainable exploitation of the resource, joining together different social and biological factors, allowing the protection of the firsts (protection of the stock) and the development of the seconds (fishery activity). Based on the population dynamics of the Gooseneck barnacle, a system dynamic model dominated by one positive and three negative loops was developed. The positive loop portrays the reproductive and maturation process, ultimately producing more adult Gooseneck barnacles. The negative loops cause the stabilisation as the different stages of the population expire due by natural causes and exploitation of the resource. According to the model results, the best management decision is the maintenance of the moratorium. Taking into account the dispersion capability of larvae, other areas near the reserve, and subjected to commercial exploitation like Ogono, Izaro and cape Villano, will benefit from the protection of Gaztelugatxe production. In the case of exploitation, the best management decision, which maximises captures and minimises the stock looses in a sustainable manner, is an alternate exploitation between Aketxe and Gaztelugatxe coastal areas of the marine reserve.
B. Nunes - One of the best experts on this subject based on the ideXlab platform.
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The Gooseneck Barnacle (Pollicipes pollicipes) as a Candidate Sentinel Species for Coastal Contamination
Archives of Environmental Contamination and Toxicology, 2014Co-Authors: A. S. Ramos, S. C. Antunes, F. Gonçalves, B. NunesAbstract:The assessment of toxic effects caused by complex mixtures of contaminants in the marine environment requires previous validation of toxicological criteria, which may include biomarker end points with distinct biological meanings. This is the case of oxidative stress/phase II detoxification (glutathione-S-transferases activity), oxidative damage (thiobarbituric acid reactive substances), and neurotransmission (cholinesterase activity), which are likely to be affected after toxic insults by common marine pollutants. The main purpose of the present study was to assess potential biological alterations in the mollusk species Pollicipes pollicipes (Gooseneck barnacle) caused by human contamination and seasonality, during a period of 1 year, in three different areas of the North Atlantic shore of Portugal. Our results indicate that fluctuations of the mentioned biomarkers were strongly related to seasonality, but they may also suffer influence by the already documented patterns of chemical contamination. Organisms collected in contaminated sampling sites (urban areas and oil refinery) showed greater levels of metabolic enzymes and increased levels of lipid peroxidation. These alterations were more evident during the summer, and, in some cases, spring months, suggesting an association between the presence of chemical stressors and temperature-dependent seasonal physiological fluctuations, which contribute to the modulation of the toxic response. In general terms, P. pollicipes was shown to be a promising organism in coastal biomonitoring programs, with an adequate sensitivity toward contamination and/or seasonal fluctuations. However, it is of the utmost importance to consider seasonal fluctuations in physiological parameters that modulate the toxic response. These factors can ultimately compromise the development and interpretation of data from marine biomonitoring programs if a thorough characterization of biological responses is not previously performed.
