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| Registros recuperados: 75 | |
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| Lorance, Pascal. |
| La pêche profonde dans les eaux communautaires est actuellement définie par le règlement du Conseil 2347/2002 du 16 Février 2002 "Etablissant des conditions spécifiques d'accès aux pêcheries des stocks d'eau profonde et fixant les exigences y afférentes". Ce règlement défini les pêcheries profondes communautaires comme celles "qui sont amenés au cours de leurs activités de pêche à capturer des espèces énumérées dans la liste figurant à l'annexe I". Une seconde annexe est jointe à ce règlement, elle comporte des espèces qui doivent faire l'objet d'observations et récolte de données lors des pêches profondes mais leur capture n'implique pas la classification de l'activité comme pêche profonde. Cette définition légale, s'applique aux eaux européennes et aux... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00099/20985/18609.pdf |
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| Feist, S. W.; Stentiford, G. D.; Kent, Maxxie; Ribeiro Santos, Ana; Lorance, Pascal. |
| The deep-sea environment is a sink for a wide variety of contaminants including heavy metals and organic compounds of anthropogenic origin. Life history traits of many deep-water fish species including longevity and high trophic position may predispose them to contaminant exposure and subsequent induction of pathological changes, including tumour formation. The lack of evidence for this hypothesis prompted this investigation in order to provide data on the presence of pathological changes in the liver and gonads of several deep-water fish species. Fish were obtained from the north east region of the Bay of Biscay (north east Atlantic Ocean) by trawling at depths between 700 to 1400m. Liver and gonad samples were collected on board ship and fixed for... |
| Tipo: Text |
Palavras-chave: Histopathology; Disease; Bay of Biscay; Neoplasia; Ovotestis; Deep-sea fish. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00252/36370/34910.pdf |
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| Marandel, Florianne; Lorance, Pascal; Andrello, Marco; Charrier, Gregory; Le Cam, Sabrina; Lehuta, Sigrid; Trenkel, Verena. |
| Studying demographic and genetic connectivity can help assessing marine meta-population structure. Rays and skates have no larval phase hence population connectivity can only result from active movement of individuals. Using thornback ray (Raja clavata) in European waters as a case study, demographic and genetic connectivity were studied for 11 putative populations for unequal population abundances and two hypotheses of dispersal rates. Genetic simulation results highlighted three large meta-populations: in the Mediterranean, around the Azores and on the Northeast Atlantic shelf. Demographic results highlighted a finer population structure indicating that several pairs of putative populations might be demographically linked. Results were highly... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00404/51535/52125.pdf |
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| Lorance, Pascal; Souissi, Sami; Uiblein, Franz. |
| The catch from bottom longline stations sampled from a series of research cruises around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was analysed in terms of fish distribution, density and diversity. The distribution of the number of species and individuals caught per station appeared to fit well the Poisson and Exponential distribution function, respectively. In particular, the parameter of the Poisson's distribution appeared to provide an index of the point (at station scale) diversity, and its confidence interval, allowing for statistical comparisons. The relationships between point diversity, the alpha diversity (in the depth strata) and the beta diversity (along the depth gradient) were investigated. Around the islands, the density and... |
| Tipo: Text |
Palavras-chave: Canary Islands; Probability distributions; Density; Diversity; Demersal fishes; Longline. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-566.pdf |
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| Nicolaus, E. E. Manuel; Barry, Jon; Bolam, Thi P. C.; Lorance, Pascal; Marandel, Florianne; Phillips, Sophy R. Mccully; Neville, Suzanna; Ellis, Jim R.. |
| Trace metal concentrations in muscle and liver tissues from two offshore species of skate were examined. Concentrations of mercury in muscle of Leucoraja circularis (n = 20; 23–110.5 cm total length, 157–490 m water depth) and L. fullonica (n = 24; 28.5–100 cm total length, 130–426 m water depth) were 0.02–1.8 and 0.04–0.61 mg kg− 1, respectively. Concentrations of both As and Hg increased with total length. Only the largest specimen had a concentration of Hg in muscle > 1.0 mg kg− 1. Data were limited for specimens > 90 cm long, and further studies on contaminants in larger-bodied skates could usefully be undertaken. |
| Tipo: Text |
Palavras-chave: Trace metals; Sandy ray; Shagreen ray; Bay of Biscay; Celtic Sea. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00397/50829/51592.pdf |
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| Moura, Teresa; Jones, Emma; Clarke, Maurice W.; Cotton, Charles F.; Crozier, Paul; Daley, Ross K.; Diez, Guzman; Dobby, Helen; Dyb, Jan E.; Fossen, Inge; Irvine, Sarah B.; Jakobsdottir, Klara; Lopez-abellan, Luis J.; Lorance, Pascal; Pascual-alayon, Pedro; Severino, Ricardo B.; Figueiredo, Ivone. |
| Deep-water sharks exhibit species-specific reproductive strategies, which include segregation by sex, size and reproductive stage. However, due to the wide spatial distribution of most species, available information, usually collected at a regional scale, is usually not adequate to infer species reproductive spatial dynamics. This study draws together information on the distribution of reproductive stages of three species of squaliform sharks: Portuguese dogfish Centroscymnus coelolepis (Somniosidae), leafscale gulper shark Centrophorus squamosus (Centrophoridae) and birdbeak dogfish Deania calcea (Centrophoridae), gathering data from several geographical areas from the Atlantic, Indian and Pacific Oceans. For each species we analysed the sex ratio and the... |
| Tipo: Text |
Palavras-chave: Commercial fishery data; Deep-sea; Life stage; Population structure; Survey data. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29902/29420.pdf |
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| Lorance, Pascal. |
| The blackspot sea bream (Pagellus bogaraveo) used to be a major species in the landings from the Bay of Biscay up to the early 1980s. Nowadays, it is only a minor bycatch. Up to the mid-70s, more than 15 000 tonnes of blackspot sea bream were landed annually in Spanish and French ports. Then, catches declined sharply from 1975 to 1985 and have stayed at low levels ever since. Here, the full history of the fishery collapse is described using time-series of landings since the 1900s. Fishing mortalities of the main demersal stocks (hake, anglerfish, sole) were in the range 0.2-0.5 during the last 30 years. It is likely that the blackspot sea bream stock was exploited at similar levels, which are shown here to be unsustainable. The blackspot sea bream is... |
| Tipo: Text |
Palavras-chave: Deep water; Management; Sex change. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00005/11600/8229.pdf |
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| Tsagarakis, Konstantinos; Mytilineou, Chryssi; Haralabous, John; Lorance, Pascal; Politou, Chrissi-yianna; Dokos, John. |
| Data from the MEDITS bottom trawl surveys in the Eastern Ionian Sea, covering a depth range of 28 to 845 m were analysed for the period 1998-2008. For each trawling location, environmental and geographical parameters were recorded, while biomass, abundance, biodiversity and size-based metrics were estimated for the total megafaunal community, as well as for four taxonomic sub-communities (Osteichthyes, Chondrichthyes, Crustacea and Cephalopoda) which were expected to respond differently to environmental changes and fishing. In addition, biomass and abundance of ten species selected based on commercial interest, depth range and life history traits were explored, with particular emphasis on deep-sea species. Fishing effort data collected during the study... |
| Tipo: Text |
Palavras-chave: Biodiversity; Fisheries impacts; Demersal community; Survey indicators; Temporal trends; Mediterranean Sea. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00176/28761/27230.pdf |
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| Marandel, Florianne; Biais, Gerard; Bidault, Adeline; Charrier, Grégory; Cornette, Florence; Lapegue, Sylvie; Laroche, Jean; Le Cam, Sabrina; Stephan, Eric; Trenkel, Verena; Lorance, Pascal. |
| At the ecosystem level, sustainable exploitation of fisheries resources depends not only on the status of target species but also on that of bycatch species, some of which are even more sensitive to exploitation. This is the case for a number of elasmobranchs (skates, rays and sharks) species whose abundance declined during the 20th century. Further, the biology of elamobranchs is still poorly known and traditional fisheries stock assessment methods using fisheries catches and scientific survey data for estimating abundance are expensive or even inapplicable due to the small numbers observed. The GenoPopTaille project attempts to apply to the case of the thornback ray (Raja clavata) recent genetic-based methods for absolute population abundance estimation... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00343/45439/44960.pdf |
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| Trenkel, Verena; Lorance, Pascal. |
| Kaup's arrowtooth eel Synaphobranchus kaupii is a small-bodied fish and an abundant inhabitant of the European continental slope. To estimate its local density video information using the remotely operated vehicle (ROV) Victor 6000 were collected at three locations in the Bay of Biscay slope. Two methods for estimating local densities were tested: strip transect counts and bait experiments. For bait experiments three behaviour types were observed in about equal proportions for individuals arriving near the seafloor: moving up the current towards the ROV, moving across the current and drifting with the current. Visible attraction towards the bait was the highest for individuals swimming against the current (80%) and about equally low for the other two types... |
| Tipo: Text |
Palavras-chave: Bayesian; Hierarchical model; Natural and reaction behaviour; Video; Deep-water. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00031/14198/11523.pdf |
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| Marandel, Florianne; Charrier, Gregory; Lamy, Jean-baptiste; Le Cam, Sabrina; Lorance, Pascal; Trenkel, Verena. |
| Effective population size (Ne) is a key parameter of population genetics. However, Ne remains challenging to estimate for natural populations as several factors are likely to bias estimates. These factors include sampling design, sequencing method, and data filtering. One issue inherent to the restriction site‐associated DNA sequencing (RADseq) protocol is missing data and SNP selection criteria (e.g., minimum minor allele frequency, number of SNPs). To evaluate the potential impact of SNP selection criteria on Ne estimates (Linkage Disequilibrium method) we used RADseq data for a nonmodel species, the thornback ray. In this data set, the inbreeding coefficient FIS was positively correlated with the amount of missing data, implying data were missing... |
| Tipo: Text |
Palavras-chave: Effective population size; Linkage disequilibrium; NeEstimator; RADseq; Skates and rays. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00607/71934/70628.pdf |
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| Lorance, Pascal. |
| A fisrt survey designed to estimate the impact of the fishery on the multispecific population of the slope has been carried out from June 26th to July 20th 1996 on board of the French R/V Thalassa. This survey took place West of Scotland, between 55 degrees and 57 degrees of latitude North, on an area from where data before exploitation were available and where fishing activity was intensive since the 90's. On this area, the analysis of the species composition by haul only showed that the fish assemblage was structured according to depth. Such a conclusion was not new. However, the positioning of the hauls on two smaller sectors characterized by different slopes and bottoms, and probably by a lesser fishing intensity on the one with rougher bottom did not... |
| Tipo: Text |
Palavras-chave: Multispecies fish population; ANE; Ireland; Hebrid terrace; France; Brittany; Meriadzec Terrace; Continental slope; Survey. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00091/20223/17875.pdf |
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| Vigneau, Joel; Van Beek, Frans; Lordan, Colm; Lorance, Pascal; Armstrong, Mike; Dalskov, Jørgen; Ullrich, Clara; Moreau, Kelle; Santurtun, Marina; Schon, Peter Jan. |
| The Third Data Deficiency Coordination Workshop with the RACs (WKDDRAC3), was planned to be chaired by Joël Vigneau (France) and Barrie Deas (UK), at ICES in Copenhagen, Denmark, on 16 January 2013 to: a) Evaluate the progress done after WKDDRAC2 b) Identify the main data issue of the northwest and southwest water stocks and agree on actions to improve data deficiencies; c) Data preparation for ICES stock benchmark meetings; |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00116/22756/25248.pdf |
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| Registros recuperados: 75 | |
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