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G B Stenson - One of the best experts on this subject based on the ideXlab platform.
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Estimated Prey Consumption by Harp seals (Phoca groenlandica), Hooded seals (Cystophora cristata),
2015Co-Authors: Grey Seals Grypus, M O Hammill, Harbour Seals, G B StensonAbstract:Consumption of prey by harp (Phoca groenlandica), hooded (Cystophora cristata), grey (Halichoerus grypus), and harbour (Phoca vitulina) seals in Atlantic Canada was estimated for the period 1990–96 by synthesizing and integrating information on indi-vidual energy requirements, population size, distribution and diet composition. Total an-nual consumption by these four Species increased from 3.1 million to 4.0 million tons over the seven-year period. Seventy-seven percent (by weight) of the total prey consump-tion consisted of fish, of which capelin and sand lance were the dominant Species ac-counting for 49 % (by weight) of the total fish consumed. The majority (74%) of total prey consumption occurred off southern Labrador and Newfoundland (Div. 2J and 3KL), fol-lowed by the northern Gulf of St Lawrence (Div. 4RS) (18%), and the eastern Scotian Shelf (Div. 4VsW) (4%). Harp seals were the most important predator, accounting for 82 % of total consumption, followed by hooded seals (10 % of total prey consumption), grey seals (7.8%), and harbour seals (0.2%). Regional differences existed in predation impacts of the four pinnipeds; harp seals were most important in Div. 2J and 3KL and in Div. 4RS, hooded seals were most important in Div. 2J and 3KL and Div. 3M (Flemish Cap), while grey seal predation predominated in the southern Gulf of St. Lawrence (Div. 4T) and on the Scotian Shelf (Div. 4VsW). Of the 3.1 million tons of fish consumed by the four Species of seals in 1996, only about 20 % accounted for Commercial Species such as Greenland halibut (7%), Atlantic cod (6%), redfish (4%), and Atlantic herring (3%). Most of the consumption of these Commercial Species consisted of juveniles
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estimated prey consumption by harp seals phoca groenlandica hooded seals cystophora cristata grey seals halichoerus grypus and harbour seals phoca vitulina in atlantic canada
Journal of Northwest Atlantic Fishery Science, 2000Co-Authors: M O Hammill, G B StensonAbstract:Consumption of prey by harp (Phoca groenlandica), hooded (Cystophora cristata), grey (Halichoerus grypus), and harbour (Phoca vitulina) seals in Atlantic Canada was estimated for the period 1990–96 by synthesizing and integrating information on individual energy requirements, population size, distribution and diet composition. Total annual consumption by these four Species increased from 3.1 million to 4.0 million tons over the seven-year period. Seventy-seven percent (by weight) of the total prey consumption consisted of fish, of which capelin and sand lance were the dominant Species accounting for 49% (by weight) of the total fish consumed. The majority (74%) of total prey consumption occurred off southern Labrador and Newfoundland (Div. 2J and 3KL), followed by the northern Gulf of St Lawrence (Div. 4RS) (18%), and the eastern Scotian Shelf (Div. 4VsW) (4%). Harp seals were the most important predator, accounting for 82% of total consumption, followed by hooded seals (10% of total prey consumption), grey seals (7.8%), and harbour seals (0.2%). Regional differences existed in predation impacts of the four pinnipeds; harp seals were most important in Div. 2J and 3KL and in Div. 4RS, hooded seals were most important in Div. 2J and 3KL and Div. 3M (Flemish Cap), while grey seal predation predominated in the southern Gulf of St. Lawrence (Div. 4T) and on the Scotian Shelf (Div. 4VsW). Of the 3.1 million tons of fish consumed by the four Species of seals in 1996, only about 20% accounted for Commercial Species such as Greenland halibut (7%), Atlantic cod (6%), redfish (4%), and Atlantic herring (3%). Most of the consumption of these Commercial Species consisted of juveniles.
D B Atkinson - One of the best experts on this subject based on the ideXlab platform.
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the biology and fishery of roundnose grenadier coryphaenoides rupestris gunnerus 1765 in the north west atlantic
1995Co-Authors: D B AtkinsonAbstract:Exploratory fishing by the Soviet Union in the north west Atlantic during the early 1960s revealed substantial concentrations of roundnose grenadier (Coryphaenoides rupestris Gunnerus 1765) inhabiting slope areas in depths greater than about 500 m. Because of this, a Commercial fishery began in 1967, and has continued to the present, albeit at relatively low levels in recent years. The biology and population dynamics of this Species have been difficult to study because of their deep distribution. As a result, although many hypotheses have been put forward, much of the research has been generally inconclusive. Their relative unimportance as a Commercial Species in the north west Atlantic has also contributed to our general lack of understanding of the Species. Nonetheless, over the years considerable information has been gathered, and this report summarises the biological investigations to date, as well as describing the history of the fishery and its management.
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the biology and fishery of roundnose grenadier coryphaenoides rupestris gunnerus 1765 in the north west atlantic
1995Co-Authors: D B AtkinsonAbstract:Exploratory fishing by the Soviet Union in the north west Atlantic during the early 1960s revealed substantial concentrations of roundnose grenadier (Coryphaenoides rupestris Gunnerus 1765) inhabiting slope areas in depths greater than about 500 m. Because of this, a Commercial fishery began in 1967, and has continued to the present, albeit at relatively low levels in recent years. The biology and population dynamics of this Species have been difficult to study because of their deep distribution. As a result, although many hypotheses have been put forward, much of the research has been generally inconclusive. Their relative unimportance as a Commercial Species in the north west Atlantic has also contributed to our general lack of understanding of the Species. Nonetheless, over the years considerable information has been gathered, and this report summarises the biological investigations to date, as well as describing the history of the fishery and its management.
Ia Morto - One of the best experts on this subject based on the ideXlab platform.
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A new and Commercial Species of Gastrosaccus Norman, 1868 (Peracarida: Mysida: Mysidae) from Java, Indonesia
2012Co-Authors: Amber, Roge N, Ia MortoAbstract:Bamber, Roger N, Morton, Brian (2012): A new and Commercial Species of Gastrosaccus Norman, 1868 (Peracarida: Mysida: Mysidae) from Java, Indonesia. Zootaxa 3546: 43-52, DOI: 10.5281/zenodo.21282
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a new and Commercial Species of gastrosaccus norman 1868 peracarida mysida mysidae from java indonesia
Zootaxa, 2012Co-Authors: Roge N Ambe, Ia MortoAbstract:A new Species of gastrosaccid mysid, Gastrosaccus yuyu, is described from the higher tidal levels of wave-exposed surfbeaches of Java, Indonesia. It belongs to that group of Gastrosaccus Species with a fringe of slender spine-like filamentsalong the posterodorsal margin of the carapace, and, in having a mid-dorsal apophysis on the fifth abdominal somite inthe adult and filaments which extend onto the postero-lateral lobes of the carapace, is close only to G. sorrentoensis. It isdistinct in having fewer marginal carapace filaments than G. sorrentoensis, as well as apical telson spines which are hardlylonger than the sub-apical lateral spines and are separated from those spines by a gap distinctly larger than those betweenthe previous spines, a more pronounced rostrum, and a distinct conformation of the distal tip of the mandibular palp, inter alia. Gastrosaccus yuyu is collected Commercially by artisanal fishermen in Java, and cooked into a fried rice-flour crisp biscuit, known locally as “peyek”.
Coll Marta - One of the best experts on this subject based on the ideXlab platform.
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Main drivers of spatial change in the biomass of Commercial Species between summer and winter in the NW Mediterranean Sea
'Elsevier BV', 2021Co-Authors: Lloret Lloret Elena, Pennino, Maria Grazia, Vilás González Daniel, Bellido, José M., Navarro Joan, Coll MartaAbstract:15 pages, 6 figures, 1 table, supplementary data https://doi.org/10.1016/j.marenvres.2020.105227There is a general lack of information related to the spatial structure and functioning of marine ecosystems considering seasonality. Here, we modeled the biomass distribution of eight Commercial marine Species in the northwestern Mediterranean Sea during winter and summer. We hypothesised that the seasonal differences of the water column and the spatial heterogeneity of oceanographic conditions in the study area could result in seasonal variations on the Species biomass distributions. We employed a Bayesian hierarchical Species distribution modelling approach (B-SDM) with data from two experimental trawl surveys to analyse which are the significant drivers in each season. Our results showed that bathymetry, temperature and fishing patterns are important variables explaining the Species spatial biomass distributions. Furthermore, we found seasonal differentiation in the spatial distribution of biomass for all the studied Species. Our results provide essential knowledge about the seasonal distributions of key Species in the Mediterranean Sea, with important management implicationsE.Ll.-Ll.- was supported by a FPU fellowship from the Spanish Ministry of Education (FPU1704395) associated to the project PELWEB (RETOS-2017-CTM2017-88939-R: Ministry of Economy, Industry and Competitivity, I+D+I projects) Science and Innovation, Spanish Government. J.N. was funded by the Spanish National Program Ramón y Cajal (RYC-2015-17809)With the funding support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), of the Spanish Research Agency (AEI)Peer reviewe
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Ecological drivers of seasonal change in Commercial Species distributions of the Northwestern Mediterranean Sea
CSIC - Centro de Estudios Avanzados de Blanes (CEAB), 2020Co-Authors: Lloret Lloret Elena, Pennino, Maria Grazia, Vilás González Daniel, Bellido, José M., Navarro Joan, Coll MartaAbstract:1st ΣPhD Ecological Symposium, 3-4 October 2019, BlanesDespite multiple studies that focus on marine Mediterranean resources and ecosystems, there is a lack of information considering the importance of seasonality on these ecosystems. This knowledgeis key to predict and understand how ecosystems can react to climate change effectsand how toimprove fishing management. Here,we examinedthe spatial distribution of eight Commercial marine Species; including fish, crustaceans and cephalopods, in a highly exploited area of the Northwestern Mediterranean Seaduring two different seasons(winter and summer). We hypothesised that theseasonal differences in the water column (with a marked thermocline in summer and absence of it in winter), as well as the spatial heterogeneity of oceanographic conditions, can result on a seasonal variation of Species distributions, which may impact ecosystem spatial and functional traits. We employed a Bayesian hierarchical Species distribution model with data from two experimental oceanographic surveys conducted during winter and summer of 2013. Our model included seven explanatory variables; depth, type of bottom substrate, water temperature (surface and bottom), sea surface salinity, primary production, and fishing effort as the drivers of Species distributions during both seasons. We identified significant drivers in each season and we analysed if they were specific or common to all the studied Species. Then,we investigated whether the functional relationships between the predicted and explanatory variables varied from winter to summer. Our results provide solid knowledge about ecosystem response to environmental and anthropogenic drivers, as well as the first systematic quantification of seasonal changes in Commercial Species distributions in the western Mediterranean Sea. These results could have important management applications and help project regional ecosystem responses to existing or new stressors in the futur
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Main drivers of seasonal change in Commercial Species distributions of the Northwestern Mediterranean Sea
Integrated Marine Biosphere Research, 2020Co-Authors: Lloret Lloret Elena, Pennino, Maria Grazia, Vilás González Daniel, Bellido, José M., Navarro Joan, Coll MartaAbstract:Future Oceans2 Integrated Marine Biosphere Research (IMBeR) Open Science Conference, 17-21 June 2019, Brest, FranceDespite multiple studies that focus on marine Mediterranean resources and ecosystems, there is a lack of information considering the importance of seasonality on these ecosystems. This knowledge is key to predict and understand how ecosystems can react to climate change effects and how to improve fishing management. Here, we examined the spatial distribution of eight Commercial marine Species; including fish, crustaceans and cephalopods, in a highly exploited area of the Northwestern Mediterranean Sea during two different seasons (winter and summer). We hypothesised that the seasonal differences in the water column (with a marked thermocline in summer and absence of it in winter), as well as the spatial heterogeneity of oceanographic conditions, can result on a seasonal variation of Species distributions, which may impact ecosystem spatial and functional traits. We employed a Bayesian hierarchical Species distribution model with data from two experimental oceanographic surveys conducted during winter and summer of 2013. Our model included seven explanatory variables; depth, type of bottom substrate, water temperature (surface and bottom), sea surface salinity, primary production, and fishing effort as the drivers of Species distributions during both seasons. We identified significant drivers in each season and we analysed if they were specific or common to all the studied Species. Then, we investigated whether the functional relationships between the predicted and explanatory variables varied from winter to summer. Our results provide solid knowledge about ecosystem response to environmental and anthropogenic drivers, as well as the first systematic quantification of seasonal changes in Commercial Species distributions in the western Mediterranean Sea. These results could have important management applications and help project regional ecosystem responses to existing or new stressors in the futur
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Ecological drivers of seasonal change in Commercial Species distributions of the Northwestern Mediterranean Sea
'Asociacion Española de Ecologia Terrestre (AEET)', 2019Co-Authors: Lloret Lloret Elena, Pennino, Maria Grazia, Vilás González Daniel, Bellido, José M., Navarro Joan, Coll MartaAbstract:1st Meeting of the Iberian Ecological Society (SIBECOL) & XIV Asociación Española de Ecología Terrestre (AEET) Meeting, Ecology: an integrative science in the Anthropocene, 4-7 February 2019, Barcelona, Spain.-- 1 pageDespite the multiple studies that focus on the Mediterranean ecosystems, there is a lack of information considering seasonality on those ecosystems, particularly related to their spatial structure and functioning. This is key to predict how ecosystems can react to adverse effects or in last case, climate change. Here we study the distribution of eight Commercial Species; including fish, crustaceans and cephalopods, in a highly exploited area of the Northwestern Mediterranean Sea during two different seasons (winter and summer). We hypothesise that the seasonal differences in the water column (with a marked thermocline in summer and absence of it in winter) as well as the spatial heterogeneity of oceanographic conditions, can result on a seasonal variation of Species distributions, with impacts on the spatial and functional traits of the ecosystems. We employ a Bayesian hierarchical Species distribution model with data from two oceanographic surveys (winter and summer). Our model includes seven explanatory variables; depth, type of substrate, temperature (surface and bottom), surface salinity, primary production, and changes in fishing effort as the drivers of Species distributions during both seasons. We search for significant drivers in each season and if they are specific or common to all the studied Species. Then, we investigate whether the functional relationships between the predicted and explanatory variables vary from winter to summer. Our results provide a more solid knowledge about the Species distributions and seasonality in the Mediterranean Sea, with important management implications in a context of increasing climate changePeer Reviewe
M O Hammill - One of the best experts on this subject based on the ideXlab platform.
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Estimated Prey Consumption by Harp seals (Phoca groenlandica), Hooded seals (Cystophora cristata),
2015Co-Authors: Grey Seals Grypus, M O Hammill, Harbour Seals, G B StensonAbstract:Consumption of prey by harp (Phoca groenlandica), hooded (Cystophora cristata), grey (Halichoerus grypus), and harbour (Phoca vitulina) seals in Atlantic Canada was estimated for the period 1990–96 by synthesizing and integrating information on indi-vidual energy requirements, population size, distribution and diet composition. Total an-nual consumption by these four Species increased from 3.1 million to 4.0 million tons over the seven-year period. Seventy-seven percent (by weight) of the total prey consump-tion consisted of fish, of which capelin and sand lance were the dominant Species ac-counting for 49 % (by weight) of the total fish consumed. The majority (74%) of total prey consumption occurred off southern Labrador and Newfoundland (Div. 2J and 3KL), fol-lowed by the northern Gulf of St Lawrence (Div. 4RS) (18%), and the eastern Scotian Shelf (Div. 4VsW) (4%). Harp seals were the most important predator, accounting for 82 % of total consumption, followed by hooded seals (10 % of total prey consumption), grey seals (7.8%), and harbour seals (0.2%). Regional differences existed in predation impacts of the four pinnipeds; harp seals were most important in Div. 2J and 3KL and in Div. 4RS, hooded seals were most important in Div. 2J and 3KL and Div. 3M (Flemish Cap), while grey seal predation predominated in the southern Gulf of St. Lawrence (Div. 4T) and on the Scotian Shelf (Div. 4VsW). Of the 3.1 million tons of fish consumed by the four Species of seals in 1996, only about 20 % accounted for Commercial Species such as Greenland halibut (7%), Atlantic cod (6%), redfish (4%), and Atlantic herring (3%). Most of the consumption of these Commercial Species consisted of juveniles
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estimated prey consumption by harp seals phoca groenlandica hooded seals cystophora cristata grey seals halichoerus grypus and harbour seals phoca vitulina in atlantic canada
Journal of Northwest Atlantic Fishery Science, 2000Co-Authors: M O Hammill, G B StensonAbstract:Consumption of prey by harp (Phoca groenlandica), hooded (Cystophora cristata), grey (Halichoerus grypus), and harbour (Phoca vitulina) seals in Atlantic Canada was estimated for the period 1990–96 by synthesizing and integrating information on individual energy requirements, population size, distribution and diet composition. Total annual consumption by these four Species increased from 3.1 million to 4.0 million tons over the seven-year period. Seventy-seven percent (by weight) of the total prey consumption consisted of fish, of which capelin and sand lance were the dominant Species accounting for 49% (by weight) of the total fish consumed. The majority (74%) of total prey consumption occurred off southern Labrador and Newfoundland (Div. 2J and 3KL), followed by the northern Gulf of St Lawrence (Div. 4RS) (18%), and the eastern Scotian Shelf (Div. 4VsW) (4%). Harp seals were the most important predator, accounting for 82% of total consumption, followed by hooded seals (10% of total prey consumption), grey seals (7.8%), and harbour seals (0.2%). Regional differences existed in predation impacts of the four pinnipeds; harp seals were most important in Div. 2J and 3KL and in Div. 4RS, hooded seals were most important in Div. 2J and 3KL and Div. 3M (Flemish Cap), while grey seal predation predominated in the southern Gulf of St. Lawrence (Div. 4T) and on the Scotian Shelf (Div. 4VsW). Of the 3.1 million tons of fish consumed by the four Species of seals in 1996, only about 20% accounted for Commercial Species such as Greenland halibut (7%), Atlantic cod (6%), redfish (4%), and Atlantic herring (3%). Most of the consumption of these Commercial Species consisted of juveniles.