6th International Jellyfish Blooms Symposium, 4-6 November 2019, Cape Town, South AfricaThe scyph... more 6th International Jellyfish Blooms Symposium, 4-6 November 2019, Cape Town, South AfricaThe scyphozoan Pelagia noctiluca (Forsskål, 1775) is the most common and widely distributed jellyfish in the Mediterranean Sea. Also, and because of its predatory effects on zooplankton community and its interactions with human activities, it is usually considered the most important jellyfish in Mediterranean waters. The ecology of adult medusae has been extensively studied. Contrariwise, due to the holoplanktonic life cycle (i.e. lack of benthonic stage) allowing its reproduction offshore, basic ecological knowledge about their larval stages (i.e. ephyrae) remains scarce. Therefore, insights about its ephyrae distribution and ecology would contribute to better understand the general ecology of the species. This work is focused on summer distribution (July-August 2016) of P. noctiluca ephyrae collected offshore at 75 stations within a large-scale sampling in the NW Mediterranean (CONECTA project)...
Average global land and ocean surface temperature has stepped up since 2014 above the average. Th... more Average global land and ocean surface temperature has stepped up since 2014 above the average. The Mediterranean Sea temperature follows this global trend. The effects of the warming on coastal areas in the Mediterranean are worrying, as they are biodiversity hotspots. Atypical warmer summer periods in the Mediterranean have been pointed out as potential drivers of massive mortalities of deep-sea organisms. Multi-sensor mooring arrays are fundamental to assess the magnitude and effects of water warming. Analysis of long-term oceanographic and biogeochemical data collected in two fixed coastal observation stations in northwestern Mediterranean Sea reveals that marine oligotrophy has intensified since 2014, with increasing water temperature by 0.25°C, greater transparency and an earlier starting of the summer conditions. Phytoplankton biomass and nutrients show no apparent change of trends. Further studies are required to assess an eventual mismatch between the life cycles of the orga...
This report provides an overview of the targeted products of Challenge 6 (Marine Environment) and... more This report provides an overview of the targeted products of Challenge 6 (Marine Environment) and describes the methodology we used to produce them. It also attempts to answer some primary "adequacy" questions.
The Norway lobster Nephrops norvegicus is one of the most important marine resources for European... more The Norway lobster Nephrops norvegicus is one of the most important marine resources for European fisheries. However, overfishing has caused the stocks to decline over the last decades, particularly in the Mediterranean Sea. The implementation of no-take marine reserves could change these current trends, thus achieving a more sustainable fishery. The effectiveness of no-take reserves depends on optimal size design, and because of this, new behavioural data on the spatial ecology of the species are of pivotal importance. Here, for the first time, we investigated the spatial movements and daily activity patterns of Norway lobster in a deep-water (315-475 m depth) no-take marine reserve of 10 km2 in the continental slope of the northwestern Mediterranean Sea, by combining acoustic tracking and tagging-recapture procedures. The results revealed the territorial behaviour of Norway lobster, centred in small exclusive individual areas where most displacements took place at midday. We found...
The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaThe effectiveness of an i... more The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaThe effectiveness of an integrated fishery management plan for the deep sea red shrimp Aristeus antennatus strongly depends on the knowledge about the displacement of individuals during their larval stage among subpopulations from different fishing grounds. To contribute to this purpose, biophysical models were used to study the potential hydrodynamic connectivity among shrimp-fishing grounds along submarine canyons in the North-western Mediterranean Sea using the spawning characteristics of the species. Modelled as passive particles, the larvae followed a main southwest drift along the continental slope and drifted up to 200 km within 31 days. The Cap Creus and Palamòs canyons were inter-connected when particles were released above 600 m depth. Only four percent of the drifters reached the estimated recruitment depth for A. antennatus at about 1,000 m depth when releases of particles took place around 800 m depth. The strength of connectivity between canyons differed with velocity fields from two different hydrodynamic models though the overall connectivity patterns prevailedPeer Reviewe
Abstract The deep-sea blue and red shrimp Aristeus antennatus is a valuable fishing resource in t... more Abstract The deep-sea blue and red shrimp Aristeus antennatus is a valuable fishing resource in the Northwestern Mediterranean Sea, currently under a local co-management plan in the port of Palamos (Spain). The management measures, although effective, might benefit other ports due to the dispersal patterns of the species pelagic larvae. Gathering information about A. antennatus larval distribution is a key step to describe these patterns, towards the establishment of well-dimensioned management measures. After a first detection of its larvae as the dominant species in the decapod community in Blanes submarine canyon, this broader approach tackles the entire management area along the Eastern Spanish Mediterranean coast (Geographic Subarea 6; GSA 6). Zooplankton sampling was carried out at 101 stations in surface waters (0.5–1 m) and in 8 stations in stratified vertical sampling (0–1200 m) during July–August 2016. Over 6500 A. antennatus larvae of all known stages were found, the first protozoea (PZ I) representing over 95% of the total. This is the first study taking into account the vertical migration of A. antennatus larvae, and we observed a broad distribution of PZ I throughout the water column. Plankton observations of the species larval distribution were supported by an Individual-Based Model suggesting aggregations in the northern submarine canyons, influenced by cold waters from the Northern Current and the geomorphology of the Ibiza Channel. The present study proposes a division of the GSA 6 in three zones to improve fishery management measures.
7 páginas, 3 figuras, 3 tablas.This study standardized the daily catch of the Balfegó joint fishi... more 7 páginas, 3 figuras, 3 tablas.This study standardized the daily catch of the Balfegó joint fishing fleet from 2003 to 2015 and updated the unstandardized CPUE of the Balfegó purse seiners: both series are contrasted with the Japanese longline standardized CPUE series. The results showed that the unstandardized series is the only one that correlates with the Japanese index (r = 0,92). The age structure estimated from video techniques measured over the period 2013-2015 is consistent, showing that at the end of May in the Balearic grounds the fully recruited age is 11 years. The results were indicative that the 2002 year class was stronger than the 2003 or 2004 classes. We conclude that the unstandardized CPUE series of Balfegó vessels are a reliable abundance index of the ABFT eastern population and should be considered in the next assessment. Nevertheless, at present this statement should not be inferred to purse seiners’ catch rates from other Mediterranean regions.Peer reviewe
Conferencia para la Universidad del Magadalena en el marco del proyecto de cooperación COOP20376 ... more Conferencia para la Universidad del Magadalena en el marco del proyecto de cooperación COOP20376 "Colaboración para el diseño de medidas de manejo de nuevas pesquerías de aguas profundas en un ecosistema prístino del mar Caribe colombiano"Los sistemas de observación marina utilizan sondas multiparamétrics y sistemas de comunicación de última generación para generar series temporales de datos que contribuyen a cuantificar la magnitud de los cambios producidos por el calentamiento de mares y océano
This dataset includes the information from thirty-six samples collected in August 2014 from 12 st... more This dataset includes the information from thirty-six samples collected in August 2014 from 12 stations along a transect crossing the Gulf of Lions, from the coast off Gruissan to the eastern side of the Gulf of Fos (French coast, NW Mediterranean). It includes the density and biomass of all microbenthic organisms collected (identified to the lowest taxonomic level). It also includes the information on the main variables describing the environmental characteristics of the samples stations: Latitude, Longitude, Distance, Depth, Escherichia coli, Enterococci, Silt, Clay, Very fine sands, Fines sands, Medium sands, Pore water, Organic Matter, Organic Carbon, Hydrocarbons C10-C40, Nitrogen, Phosphorous, Aluminium total, Arsenium total, Cadmium total, Chrome total, Copper total, Iron total, Mercury total, Nickel total, Lead total, Zinc total, HAPs, total PCBs, Acenaphtylene, Fluoranthene , Benzo (b) fluoranthene , Benzo (k) fluoranthene, Benzo (a) pyrene , Benzo (ghi) perylene, Indeno (1...
The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaDecapod crustacean fisher... more The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaDecapod crustacean fisheries play a crucial role in the Northwestern Mediterranean coast due to their high commercial interest. Yet, larval ecology and recruitment of the species are still little known, although this information is essential to set sustainable fisheries management. In this paper, we describe the larval composition, abundance and distribution of decapod crustaceans in the submarine canyon off Blanes (Northwestern Mediterranean Sea). Samples were collected in September 2011 with a multi-net system and a 60 cm-bongo net (mesh size: 300 ¿m) in 22 stations with bottom depths between 100 and 1800 m, and preserved in 5% formaldehyde. Decapod larvae were sorted and identified to the lowest possible taxonomical level. A total of 470 larvae from 26 genera were found. Gennadas spp. showed the highest average density (7.93 individuals·1000 m-3), followed by Sergestes spp. (7.24) and Alpheus glaber (6.78). These three taxa were dominant (> 20% of total decapod larvae) in more than half of the stations. Total decapod larval density and Shannon diversity index values were significantly higher in the canyon head than in the upstream wallPeer Reviewe
International Conference on Marine Data and Information Systems (IMDIS 2018), 5-7 November 2018, ... more International Conference on Marine Data and Information Systems (IMDIS 2018), 5-7 November 2018, Barcelona, Spain.-- 2 pages, 3 figures
6th International Jellyfish Blooms Symposium, 4-6 November 2019, Cape Town, South AfricaThe scyph... more 6th International Jellyfish Blooms Symposium, 4-6 November 2019, Cape Town, South AfricaThe scyphozoan Pelagia noctiluca (Forsskål, 1775) is the most common and widely distributed jellyfish in the Mediterranean Sea. Also, and because of its predatory effects on zooplankton community and its interactions with human activities, it is usually considered the most important jellyfish in Mediterranean waters. The ecology of adult medusae has been extensively studied. Contrariwise, due to the holoplanktonic life cycle (i.e. lack of benthonic stage) allowing its reproduction offshore, basic ecological knowledge about their larval stages (i.e. ephyrae) remains scarce. Therefore, insights about its ephyrae distribution and ecology would contribute to better understand the general ecology of the species. This work is focused on summer distribution (July-August 2016) of P. noctiluca ephyrae collected offshore at 75 stations within a large-scale sampling in the NW Mediterranean (CONECTA project)...
Average global land and ocean surface temperature has stepped up since 2014 above the average. Th... more Average global land and ocean surface temperature has stepped up since 2014 above the average. The Mediterranean Sea temperature follows this global trend. The effects of the warming on coastal areas in the Mediterranean are worrying, as they are biodiversity hotspots. Atypical warmer summer periods in the Mediterranean have been pointed out as potential drivers of massive mortalities of deep-sea organisms. Multi-sensor mooring arrays are fundamental to assess the magnitude and effects of water warming. Analysis of long-term oceanographic and biogeochemical data collected in two fixed coastal observation stations in northwestern Mediterranean Sea reveals that marine oligotrophy has intensified since 2014, with increasing water temperature by 0.25°C, greater transparency and an earlier starting of the summer conditions. Phytoplankton biomass and nutrients show no apparent change of trends. Further studies are required to assess an eventual mismatch between the life cycles of the orga...
This report provides an overview of the targeted products of Challenge 6 (Marine Environment) and... more This report provides an overview of the targeted products of Challenge 6 (Marine Environment) and describes the methodology we used to produce them. It also attempts to answer some primary "adequacy" questions.
The Norway lobster Nephrops norvegicus is one of the most important marine resources for European... more The Norway lobster Nephrops norvegicus is one of the most important marine resources for European fisheries. However, overfishing has caused the stocks to decline over the last decades, particularly in the Mediterranean Sea. The implementation of no-take marine reserves could change these current trends, thus achieving a more sustainable fishery. The effectiveness of no-take reserves depends on optimal size design, and because of this, new behavioural data on the spatial ecology of the species are of pivotal importance. Here, for the first time, we investigated the spatial movements and daily activity patterns of Norway lobster in a deep-water (315-475 m depth) no-take marine reserve of 10 km2 in the continental slope of the northwestern Mediterranean Sea, by combining acoustic tracking and tagging-recapture procedures. The results revealed the territorial behaviour of Norway lobster, centred in small exclusive individual areas where most displacements took place at midday. We found...
The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaThe effectiveness of an i... more The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaThe effectiveness of an integrated fishery management plan for the deep sea red shrimp Aristeus antennatus strongly depends on the knowledge about the displacement of individuals during their larval stage among subpopulations from different fishing grounds. To contribute to this purpose, biophysical models were used to study the potential hydrodynamic connectivity among shrimp-fishing grounds along submarine canyons in the North-western Mediterranean Sea using the spawning characteristics of the species. Modelled as passive particles, the larvae followed a main southwest drift along the continental slope and drifted up to 200 km within 31 days. The Cap Creus and Palamòs canyons were inter-connected when particles were released above 600 m depth. Only four percent of the drifters reached the estimated recruitment depth for A. antennatus at about 1,000 m depth when releases of particles took place around 800 m depth. The strength of connectivity between canyons differed with velocity fields from two different hydrodynamic models though the overall connectivity patterns prevailedPeer Reviewe
Abstract The deep-sea blue and red shrimp Aristeus antennatus is a valuable fishing resource in t... more Abstract The deep-sea blue and red shrimp Aristeus antennatus is a valuable fishing resource in the Northwestern Mediterranean Sea, currently under a local co-management plan in the port of Palamos (Spain). The management measures, although effective, might benefit other ports due to the dispersal patterns of the species pelagic larvae. Gathering information about A. antennatus larval distribution is a key step to describe these patterns, towards the establishment of well-dimensioned management measures. After a first detection of its larvae as the dominant species in the decapod community in Blanes submarine canyon, this broader approach tackles the entire management area along the Eastern Spanish Mediterranean coast (Geographic Subarea 6; GSA 6). Zooplankton sampling was carried out at 101 stations in surface waters (0.5–1 m) and in 8 stations in stratified vertical sampling (0–1200 m) during July–August 2016. Over 6500 A. antennatus larvae of all known stages were found, the first protozoea (PZ I) representing over 95% of the total. This is the first study taking into account the vertical migration of A. antennatus larvae, and we observed a broad distribution of PZ I throughout the water column. Plankton observations of the species larval distribution were supported by an Individual-Based Model suggesting aggregations in the northern submarine canyons, influenced by cold waters from the Northern Current and the geomorphology of the Ibiza Channel. The present study proposes a division of the GSA 6 in three zones to improve fishery management measures.
7 páginas, 3 figuras, 3 tablas.This study standardized the daily catch of the Balfegó joint fishi... more 7 páginas, 3 figuras, 3 tablas.This study standardized the daily catch of the Balfegó joint fishing fleet from 2003 to 2015 and updated the unstandardized CPUE of the Balfegó purse seiners: both series are contrasted with the Japanese longline standardized CPUE series. The results showed that the unstandardized series is the only one that correlates with the Japanese index (r = 0,92). The age structure estimated from video techniques measured over the period 2013-2015 is consistent, showing that at the end of May in the Balearic grounds the fully recruited age is 11 years. The results were indicative that the 2002 year class was stronger than the 2003 or 2004 classes. We conclude that the unstandardized CPUE series of Balfegó vessels are a reliable abundance index of the ABFT eastern population and should be considered in the next assessment. Nevertheless, at present this statement should not be inferred to purse seiners’ catch rates from other Mediterranean regions.Peer reviewe
Conferencia para la Universidad del Magadalena en el marco del proyecto de cooperación COOP20376 ... more Conferencia para la Universidad del Magadalena en el marco del proyecto de cooperación COOP20376 "Colaboración para el diseño de medidas de manejo de nuevas pesquerías de aguas profundas en un ecosistema prístino del mar Caribe colombiano"Los sistemas de observación marina utilizan sondas multiparamétrics y sistemas de comunicación de última generación para generar series temporales de datos que contribuyen a cuantificar la magnitud de los cambios producidos por el calentamiento de mares y océano
This dataset includes the information from thirty-six samples collected in August 2014 from 12 st... more This dataset includes the information from thirty-six samples collected in August 2014 from 12 stations along a transect crossing the Gulf of Lions, from the coast off Gruissan to the eastern side of the Gulf of Fos (French coast, NW Mediterranean). It includes the density and biomass of all microbenthic organisms collected (identified to the lowest taxonomic level). It also includes the information on the main variables describing the environmental characteristics of the samples stations: Latitude, Longitude, Distance, Depth, Escherichia coli, Enterococci, Silt, Clay, Very fine sands, Fines sands, Medium sands, Pore water, Organic Matter, Organic Carbon, Hydrocarbons C10-C40, Nitrogen, Phosphorous, Aluminium total, Arsenium total, Cadmium total, Chrome total, Copper total, Iron total, Mercury total, Nickel total, Lead total, Zinc total, HAPs, total PCBs, Acenaphtylene, Fluoranthene , Benzo (b) fluoranthene , Benzo (k) fluoranthene, Benzo (a) pyrene , Benzo (ghi) perylene, Indeno (1...
The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaDecapod crustacean fisher... more The Crustacean Society (TCS) Mid-Year Meeting, 9-22 June 2017, BarcelonaDecapod crustacean fisheries play a crucial role in the Northwestern Mediterranean coast due to their high commercial interest. Yet, larval ecology and recruitment of the species are still little known, although this information is essential to set sustainable fisheries management. In this paper, we describe the larval composition, abundance and distribution of decapod crustaceans in the submarine canyon off Blanes (Northwestern Mediterranean Sea). Samples were collected in September 2011 with a multi-net system and a 60 cm-bongo net (mesh size: 300 ¿m) in 22 stations with bottom depths between 100 and 1800 m, and preserved in 5% formaldehyde. Decapod larvae were sorted and identified to the lowest possible taxonomical level. A total of 470 larvae from 26 genera were found. Gennadas spp. showed the highest average density (7.93 individuals·1000 m-3), followed by Sergestes spp. (7.24) and Alpheus glaber (6.78). These three taxa were dominant (> 20% of total decapod larvae) in more than half of the stations. Total decapod larval density and Shannon diversity index values were significantly higher in the canyon head than in the upstream wallPeer Reviewe
International Conference on Marine Data and Information Systems (IMDIS 2018), 5-7 November 2018, ... more International Conference on Marine Data and Information Systems (IMDIS 2018), 5-7 November 2018, Barcelona, Spain.-- 2 pages, 3 figures
Uploads
Papers by Nixon Bahamon