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Registros recuperados: 6
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A bio-economic analysis of long term changes in the production of French fishing fleets operating in the Bay of Biscay ArchiMer
Steinmetz, Fabien; Thebaud, Olivier; Blanchard, Fabian; Le Floc H, Pascal; Bihel, J.
Selective fishing pressure on more highly valued marine living resources is one of the key factors proposed to explain changes occurring in fish communities and associated landings of commercial fisheries. The aim of this paper is to establish the nature of changes in the landings of French fishing fleets operating in the Bay of Biscay in the period 1973-2002, and whether these changes could be related to the relative economic attractiveness of different fish species. The analysis focuses on trends observed in the landings of all commercial fish species over the last three decades. It is based on data of annual quantities landed and ex-vessel prices compiled from official French landings records, and on bio-geographical descriptors of these species derived...
Tipo: Text Palavras-chave: North Eastern Atlantic; Bay of Biscay; Long term changes; Bio economic analysis; French fisheries production.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5926.pdf
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Historical fluctuations in spawning location of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during 1967-73 and 2000-2004 ArchiMer
Bellier, Edwige; Planque, Benjamin; Petitgas, Pierre.
The spatial extent of small pelagic fish spawning habitat is influenced by environmental factors and by the state of the adult population. In return, the configuration of spawning habitat affects recruitment and therefore the future structure of the adult population. Interannual changes in spatial patterns of spawning reflect variations in adult population structures and their environment. The present study describes the historical changes in the spatial distribution of spawning of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during two periods: 1967-72 and 2000-2004. Using data from egg surveys conducted in spring, the spatial distributions of anchovy and sardine eggs are characterized by means of geostatistics....
Tipo: Text Palavras-chave: Spawning habitat; Spatial patterns; Sardine; Long term changes; Bay of Biscay; Anchovy.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2179.pdf
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Incidence de la pêche sur la biodiversité ichtyologique marine : le bassin d'Arcachon et le plateau continental sud Gascogne ArchiMer
Quero, Jean-claude; Cendrero, O.
Estimation of changes in the relative abundance of fish species in catches off Arcachon, on the shelf and in the Bassin d'Arcachon, from 1727 to the present day, shows that some previously dominant species are becoming scarce. Some are actually not caught now in the south of the Bay of Biscay. Among these are the large bottom-living elasmobranchs with low reproduction rates, such as Echinorhinus brucus, Squatina squatina, Raja batis, Raja brachyura, Dasyatis pastinaca, Myliobatis aquila, Galeorhinus galeus, Mustelus asterias, Raja clavata, ,.. and some actinopterygians, such as Trigla lyra, while catches of Eutrigla gurnardus are much reduced. Bottom trawling is principally responsible for these reductions but all fishing methods used there have...
Tipo: Text Palavras-chave: Species extinction; Fishing induced effects; Long term changes; Arcachon; France; ANE; Marine fishes.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/publication-3793.pdf
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Mise en evidence des profils d'évolution pluariannuelle associés aux series de mesures de parametres hydrobiologiques effectuées dans l'estuaire de la Seine dans le cadre du reseau national d'observation de la qualité du milieu marin ArchiMer
Gallet, P.
The author deals with hydrobiological data obtained monthly by the French marine pollution network. The mathematical analysis gives a representation of ammonium, phosphates, silicate, nitrogen and dissolved oxygen evolution from 1976 to 1983.
Tipo: Text Palavras-chave: Mathematical models; Estuaries; Long term changes; Pollution monitoring; Water quality; Time series analysis; Physicochemical properties; Water properties.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1296.pdf
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Some like it hot: Paracartia grani (Copepoda: Calanoida) arrival in the Thau lagoon (south of France—Mediterranean Sea) ArchiMer
Boyer, Séverine; Arzul, Isabelle; Bonnet, Delphine.
Paracartia grani originates from high latitudes and has progressively been recorded in the Mediterranean Sea since the 1980s. In Thau lagoon, while Acartia clausi and Acartia discaudata present maximum peaks of abundance from January to April and in November and December, both species being perennial over the year, P. grani and Paracartia latisetosa appear in May, develop during summer, in July and August, and slowly decrease in autumn before disappearing from the water column in December. The Acartiidae populations have changed over the years at our monitoring station. Indeed, P. latisetosa was last recorded in August 1983 while P. grani appeared in the lagoon in 1998.
Tipo: Text Palavras-chave: Paracartia grani; Mediterranean Sea; Long term changes; Acartia spp.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00092/20354/18007.pdf
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Изменчивость структурных характеристик фитопланктона в Черном Море IBSS Repository
Брянцева, Ю. В..
Диссертация на соискание ученой степени кандидата биологических на- ук по специальности 03.00.17 – гидробиология. – Институт биологии южных морей им. А.О. Ковалевского НАН Украины, Севастополь, 1999. Впервые, на основе регулярных сезонных наблюдений в течение годо- вого цикла (март, май, июль, сентябрь, ноябрь 1992 и февраль 1993 гг.) по единой сетке станций получены подробные данные по фитопланктону обшир- ной акватории северной части Черного моря. Исследованы структурные ха- рактеристики фитопланктона в различных районах Черного моря, выделенных в соответствии с его естественными океанологическими зонами. Выявлены особенности в сезонной сукцессии комплексов видов фитопланктона а также рассчитаны значения его среднего обилия и суммарного запаса в этих...
Tipo: Theses and Dissertations Palavras-chave: Фитопланктон; Сезонная сукцессия; Многолетние изменения; Естественные и антропогенные факторы; Black Sea; Phytoplankton; Seasonal succession; Long term changes; Natural and anthropogenic factors. Phytoplankton Long-term changes Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2000 URL: http://repository.ibss.org.ua/dspace/handle/99011/662
Registros recuperados: 6
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