IDEA Workshop: Wrapping up of the IDEA project: International Workshop on the Environment, Demers... more IDEA Workshop: Wrapping up of the IDEA project: International Workshop on the Environment, Demersal Resources and Fisheries, 10-12 May 2006, Palma, España.-- 1 pagePeer reviewe
The living and dead fauna of Valencia Seamount, a deep promontory in the middle of the Balearic B... more The living and dead fauna of Valencia Seamount, a deep promontory in the middle of the Balearic Basin which summit is at ca. 1100 m depth, is described by first time based in a rock dredge perfomed in a sedimentary area of the summit Mount. Surface-feeder polychaetes (the Paraonidae Levinsenia gracilis and Terebellidae as dominant), and taxodont bivalves ( Ledella messanensis and Yoldiella ovulum ) were the main species of benthos. We found alive remains of the bamboo coral Isidella elongata , a vulnerable, habitat-forming species in the deep Mediterranean. Benthos density was low (0.6 organisms/2 dm 3 mud). Thanatocoenosis evidenced a rather moderate diversity of benthic bivalves (11 species) and gastropods (9 species) also dominated by surface deposit feeders. Fish (identified/quantified from sedimented otoliths) showed diversified and abundant mesopelagic fauna, mainly Myctophidae. More interestingly, we highlighted among benthopelagic fish the occurrence of recruits of Merlucciu...
To reduce the practice of discarding commercially fished organisms, several measures such as a di... more To reduce the practice of discarding commercially fished organisms, several measures such as a discard ban and extra allowances on top of landings quotas (“catch quota”) have been proposed by the European Commission. However, for their development and successful implementation, an understanding of discard patterns on a European scale is needed. In this study, we present an inter-national synthesis of discard data collected on board commercial, towed-gear equipped vessels operating under six different national flags spanning from the Baltic to the Mediterranean Seas mainly between 2003 and 2008. We considered discarded species of commercial value such as Atlantic cod (Gadus morhua), haddock (Melanogrammus aeglefinus), European hake (Merluccius merluccius), and European plaice (Pleuronectes platessa). Comparisons of discard per unit effort rates expressed as numbers per hour of fishing revealed that in the Mediterranean Sea minimum size-regulated species such as hake are generally dis...
17 pages, 5 figures, 7 tablesChanges in the physiological condition (represented by Kn = body wei... more 17 pages, 5 figures, 7 tablesChanges in the physiological condition (represented by Kn = body weight/length-predicted weight) of the deep-sea shrimp Aristeus antennatus associated with the warming and rising salinity trends in the western Mediterranean were analyzed to explore how deep-sea populations can reconfigure their biology to match the changes in ocean conditions. Two slope areas around the Balearic Islands (Western Mediterranean Sea) were analyzed using sampling data and generalized additive models. The 23 yr time series of monthly Kn estimates shows 2 different aspects of the life history of A. antennatus, corresponding to 2 different seasonal periods. The Kn series from June through September reflects the shrimps’ reproductive condition to the north of the Islands, while samples from October through May represent a period of low gonad weight and high hepatosomatic indices to the south of the Islands. Oceanographic variables used to construct models and seek relationships with changes in Kn were salinity, temperature, and dissolved oxygen in the Levantine Intermediate Water and Western Mediterranean Deep Water layers, and chlorophyll a satellite imagery data. The North Atlantic Oscillation and the Eastern Atlantic index were used as climatic indicators. Physiologic condition during the winter fattening periods decreased over the time series and was negatively correlated with increasing salinity. During the summer reproductive periods, the best-fitting models show a year-on-year effect and a significant probability of effects on condition from oligotrophication. These results suggest that increasing salinity at depth, which ultimately increases oligotrophy, may cause changes in physiological conditionPeer Reviewe
The microscale spatial distribution of coastal zooplankton was studied during the month of June a... more The microscale spatial distribution of coastal zooplankton was studied during the month of June at the largest marine reserve of Mallorca: Peninsula de Llevant using light traps. The assemblage was characterized by the most abundant taxa being peracarida crustaceans, including isopods, cumaceans and amphipods. Decapoda larvae, especially brachyuran megalopa larvae, were also abundant with Monodaeus couchii, Pinnotheres sp., Ebalia sp. and specimens from Portunidae family as the most abundant species. Analyses of crustacean abundance between light traps indicated a vertical distribution on the water column, with lower abundance at surface traps and higher at bottom traps. No clear horizontal pattern in total crustacean abundance was found, except in megalopa larvae that showed a gradient in relation to the distance to coastline. Light traps have been corroborated as a valuable tool for sampling crustacean larvae and therefore to assess effects of protection on planktonic stages.
Un specimen de Trachyscorpia cristulata echinata, capture au sud de Majorque (Mediterranee nord-o... more Un specimen de Trachyscorpia cristulata echinata, capture au sud de Majorque (Mediterranee nord-occidentale), est decrit d'un point de vue morphometrique et meristique. Certains indices morphometriques sont comptes avec ceux qui ont ete releves par d'autres auteurs sur des specimens de cette espece provenant d'autres zones de la Mediterranee et de l'Atlantique
Abstract The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery... more Abstract The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery in the Alboran Sea, Western Mediterranean are investigated. We evaluate whether environmental and climatic variability, measured from operational oceanographic data, allow assessment of discarded species abundances. Monthly data collected by onboard fishery observers during 2011 and 2012 in the Northern Alboran Sea served as a case study of the trawling fishery’s dynamics. The study area was split into west and east zones to account for differences in the Atlantic and Mediterranean Sea water influences, for distinct geomorphology and for species composition of catches. Sixteen species divided in three groups were analysed: species without discards, those partially discarded and those completely discarded. Applying Gaussian Generalized Additive Models (GAM), we tested the relationships of standard oceanographic data products and climatic variability with discard abundances. These variables were sea surface temperature (SST) and chlorophyll a (chl-a) from satellite imagery, as indicators of environmental conditions, and the North Atlantic Oscillation index (NAO) as a climatic indicator. Models were applied for target and bycatch species partially discarded. These were the following species: gadoid like European hake (Merluccius merluccius), Blue Whiting (Micromesistius poutassou), Seabreams (Pagellus acarne, and Pagellus erythrinus), and Mackerels (Trachurus mediterraneus, Trachurus picturatus and Trachurus trachurus). Surface seawater temperature was a relevant variable in coastal and eastern, more haline Mediterranean waters. Climatic variability represented by NAO was useful for assessing discard rates in the more productive western zone. Chlorophyll a showed less relevance for discard prediction models, but it was more related in the coastal zones. Including oceanographic data products and climatic patterns in GAM models of fishery discards provides a new perspective that may improve our predictive capabilities for management decisions.
104 especes de Poissons demersaux ont ete capturees dans 46 chalutages effectues le long du plate... more 104 especes de Poissons demersaux ont ete capturees dans 46 chalutages effectues le long du plateau continental et du talus de l'ile de Majorque. L'analyse hierarchique des donnees qualitatives a permis de differencier 4 communautes. Les fonds de profondeur inferieure a 30 m avec des herbiers de Posidonia oceanica sont caracterises par la dominance en nombre des especes de Labridae et la presence exclusive des Syngnathidae et des Gobiesocidae. Dans les fonds de 30 a 70 m colonises par le maerl, Mullus surmuletus et Spicara smaris dominent et sont les especes recherchees par les petits chalutiers pendant la nuit. Merluccius merluccius est abondant sur les fonds vaseux de 70 a 180 m et constitue une autre espece capturee par ces bateaux. Cette derniere communaute est situee au niveau du talus continental, entre 500 et 800 m de profondeur et est exploitee par des chalutiers plus grands, dont l'activite principale est la peche des Crevettes rouges (Aristeus antennatus).
Differences in fishery demersal discards in low and high productive marine ecosystems in the Nort... more Differences in fishery demersal discards in low and high productive marine ecosystems in the North-western Mediterranean were studied. Analyses were carried in three common fishing tactics carried out in different habitats from coastal to slope bottoms. Though clearly out of date (1996-2000 years), data remain useful when formulating comparisons, and simultaneously establishing a temporal reference values of trawling fishing impact. Results revealed discards were strongly positively correlated with the biomass harvested. In the higher productive zone, in Northern Catalonia, discards varied significantly with the season of the year, whereas in the low productive zone, in the Balearic Islands, discards depend on the characteristics of the biocenosis of the bottom substratum. In the coastal and shelf fisheries, the highest average biomass for retained and discards catches were recorded in spring and summer in Northern Catalonia and autumn and winter in the Balearic Islands. In the slop...
Memoria de tesis doctoral presentada por Aina Carbonell Quetglas para optar al grado de Doctora p... more Memoria de tesis doctoral presentada por Aina Carbonell Quetglas para optar al grado de Doctora por la Universitat de les Illes Balears (UIB), realizada bajo la direccion de la Dra. Montserrat Demestre Alted del Institut de Ciencies del Mar (ICM-CSIC)
IDEA Workshop: Wrapping up of the IDEA project: International Workshop on the Environment, Demers... more IDEA Workshop: Wrapping up of the IDEA project: International Workshop on the Environment, Demersal Resources and Fisheries, 10-12 May 2006, Palma, España.-- 1 pagePeer reviewe
The living and dead fauna of Valencia Seamount, a deep promontory in the middle of the Balearic B... more The living and dead fauna of Valencia Seamount, a deep promontory in the middle of the Balearic Basin which summit is at ca. 1100 m depth, is described by first time based in a rock dredge perfomed in a sedimentary area of the summit Mount. Surface-feeder polychaetes (the Paraonidae Levinsenia gracilis and Terebellidae as dominant), and taxodont bivalves ( Ledella messanensis and Yoldiella ovulum ) were the main species of benthos. We found alive remains of the bamboo coral Isidella elongata , a vulnerable, habitat-forming species in the deep Mediterranean. Benthos density was low (0.6 organisms/2 dm 3 mud). Thanatocoenosis evidenced a rather moderate diversity of benthic bivalves (11 species) and gastropods (9 species) also dominated by surface deposit feeders. Fish (identified/quantified from sedimented otoliths) showed diversified and abundant mesopelagic fauna, mainly Myctophidae. More interestingly, we highlighted among benthopelagic fish the occurrence of recruits of Merlucciu...
To reduce the practice of discarding commercially fished organisms, several measures such as a di... more To reduce the practice of discarding commercially fished organisms, several measures such as a discard ban and extra allowances on top of landings quotas (“catch quota”) have been proposed by the European Commission. However, for their development and successful implementation, an understanding of discard patterns on a European scale is needed. In this study, we present an inter-national synthesis of discard data collected on board commercial, towed-gear equipped vessels operating under six different national flags spanning from the Baltic to the Mediterranean Seas mainly between 2003 and 2008. We considered discarded species of commercial value such as Atlantic cod (Gadus morhua), haddock (Melanogrammus aeglefinus), European hake (Merluccius merluccius), and European plaice (Pleuronectes platessa). Comparisons of discard per unit effort rates expressed as numbers per hour of fishing revealed that in the Mediterranean Sea minimum size-regulated species such as hake are generally dis...
17 pages, 5 figures, 7 tablesChanges in the physiological condition (represented by Kn = body wei... more 17 pages, 5 figures, 7 tablesChanges in the physiological condition (represented by Kn = body weight/length-predicted weight) of the deep-sea shrimp Aristeus antennatus associated with the warming and rising salinity trends in the western Mediterranean were analyzed to explore how deep-sea populations can reconfigure their biology to match the changes in ocean conditions. Two slope areas around the Balearic Islands (Western Mediterranean Sea) were analyzed using sampling data and generalized additive models. The 23 yr time series of monthly Kn estimates shows 2 different aspects of the life history of A. antennatus, corresponding to 2 different seasonal periods. The Kn series from June through September reflects the shrimps’ reproductive condition to the north of the Islands, while samples from October through May represent a period of low gonad weight and high hepatosomatic indices to the south of the Islands. Oceanographic variables used to construct models and seek relationships with changes in Kn were salinity, temperature, and dissolved oxygen in the Levantine Intermediate Water and Western Mediterranean Deep Water layers, and chlorophyll a satellite imagery data. The North Atlantic Oscillation and the Eastern Atlantic index were used as climatic indicators. Physiologic condition during the winter fattening periods decreased over the time series and was negatively correlated with increasing salinity. During the summer reproductive periods, the best-fitting models show a year-on-year effect and a significant probability of effects on condition from oligotrophication. These results suggest that increasing salinity at depth, which ultimately increases oligotrophy, may cause changes in physiological conditionPeer Reviewe
The microscale spatial distribution of coastal zooplankton was studied during the month of June a... more The microscale spatial distribution of coastal zooplankton was studied during the month of June at the largest marine reserve of Mallorca: Peninsula de Llevant using light traps. The assemblage was characterized by the most abundant taxa being peracarida crustaceans, including isopods, cumaceans and amphipods. Decapoda larvae, especially brachyuran megalopa larvae, were also abundant with Monodaeus couchii, Pinnotheres sp., Ebalia sp. and specimens from Portunidae family as the most abundant species. Analyses of crustacean abundance between light traps indicated a vertical distribution on the water column, with lower abundance at surface traps and higher at bottom traps. No clear horizontal pattern in total crustacean abundance was found, except in megalopa larvae that showed a gradient in relation to the distance to coastline. Light traps have been corroborated as a valuable tool for sampling crustacean larvae and therefore to assess effects of protection on planktonic stages.
Un specimen de Trachyscorpia cristulata echinata, capture au sud de Majorque (Mediterranee nord-o... more Un specimen de Trachyscorpia cristulata echinata, capture au sud de Majorque (Mediterranee nord-occidentale), est decrit d'un point de vue morphometrique et meristique. Certains indices morphometriques sont comptes avec ceux qui ont ete releves par d'autres auteurs sur des specimens de cette espece provenant d'autres zones de la Mediterranee et de l'Atlantique
Abstract The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery... more Abstract The ecosystem processes underlying the discard rates of the demersal otter-trawl fishery in the Alboran Sea, Western Mediterranean are investigated. We evaluate whether environmental and climatic variability, measured from operational oceanographic data, allow assessment of discarded species abundances. Monthly data collected by onboard fishery observers during 2011 and 2012 in the Northern Alboran Sea served as a case study of the trawling fishery’s dynamics. The study area was split into west and east zones to account for differences in the Atlantic and Mediterranean Sea water influences, for distinct geomorphology and for species composition of catches. Sixteen species divided in three groups were analysed: species without discards, those partially discarded and those completely discarded. Applying Gaussian Generalized Additive Models (GAM), we tested the relationships of standard oceanographic data products and climatic variability with discard abundances. These variables were sea surface temperature (SST) and chlorophyll a (chl-a) from satellite imagery, as indicators of environmental conditions, and the North Atlantic Oscillation index (NAO) as a climatic indicator. Models were applied for target and bycatch species partially discarded. These were the following species: gadoid like European hake (Merluccius merluccius), Blue Whiting (Micromesistius poutassou), Seabreams (Pagellus acarne, and Pagellus erythrinus), and Mackerels (Trachurus mediterraneus, Trachurus picturatus and Trachurus trachurus). Surface seawater temperature was a relevant variable in coastal and eastern, more haline Mediterranean waters. Climatic variability represented by NAO was useful for assessing discard rates in the more productive western zone. Chlorophyll a showed less relevance for discard prediction models, but it was more related in the coastal zones. Including oceanographic data products and climatic patterns in GAM models of fishery discards provides a new perspective that may improve our predictive capabilities for management decisions.
104 especes de Poissons demersaux ont ete capturees dans 46 chalutages effectues le long du plate... more 104 especes de Poissons demersaux ont ete capturees dans 46 chalutages effectues le long du plateau continental et du talus de l'ile de Majorque. L'analyse hierarchique des donnees qualitatives a permis de differencier 4 communautes. Les fonds de profondeur inferieure a 30 m avec des herbiers de Posidonia oceanica sont caracterises par la dominance en nombre des especes de Labridae et la presence exclusive des Syngnathidae et des Gobiesocidae. Dans les fonds de 30 a 70 m colonises par le maerl, Mullus surmuletus et Spicara smaris dominent et sont les especes recherchees par les petits chalutiers pendant la nuit. Merluccius merluccius est abondant sur les fonds vaseux de 70 a 180 m et constitue une autre espece capturee par ces bateaux. Cette derniere communaute est situee au niveau du talus continental, entre 500 et 800 m de profondeur et est exploitee par des chalutiers plus grands, dont l'activite principale est la peche des Crevettes rouges (Aristeus antennatus).
Differences in fishery demersal discards in low and high productive marine ecosystems in the Nort... more Differences in fishery demersal discards in low and high productive marine ecosystems in the North-western Mediterranean were studied. Analyses were carried in three common fishing tactics carried out in different habitats from coastal to slope bottoms. Though clearly out of date (1996-2000 years), data remain useful when formulating comparisons, and simultaneously establishing a temporal reference values of trawling fishing impact. Results revealed discards were strongly positively correlated with the biomass harvested. In the higher productive zone, in Northern Catalonia, discards varied significantly with the season of the year, whereas in the low productive zone, in the Balearic Islands, discards depend on the characteristics of the biocenosis of the bottom substratum. In the coastal and shelf fisheries, the highest average biomass for retained and discards catches were recorded in spring and summer in Northern Catalonia and autumn and winter in the Balearic Islands. In the slop...
Memoria de tesis doctoral presentada por Aina Carbonell Quetglas para optar al grado de Doctora p... more Memoria de tesis doctoral presentada por Aina Carbonell Quetglas para optar al grado de Doctora por la Universitat de les Illes Balears (UIB), realizada bajo la direccion de la Dra. Montserrat Demestre Alted del Institut de Ciencies del Mar (ICM-CSIC)
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