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A biosystematic basis for pelagic biodiversity Naturalis
Spoel, S. van der.
Biodiversity can be considered to be a human appreciation of the biological entity diversity. Diversity can be expressed numerically on the basis of taxa found, but it can also be expressed as the contribution of a specimen to the diversity, for which a formula is proposed. Diversity is the sum of the taxonomic or numerical diversity, and the ecological, genetical, historical, and phylogenetic diversity. Moreover, each group, or larger taxon, has its own characteristic diversity. These types of diversity are considered separately. One formula is tentatively proposed to calculate the overall diversity. Diversity in nature is variable, which is demonstrated in a diagram for comparison with societyinduced diversity changes. Diversity in the pelagic fluctuates...
Tipo: Article / Letter to the editor Palavras-chave: Biodiversity; Diversity calculation; Ecology; Pelagic; Phylogeny.
Ano: 1994 URL: http://www.repository.naturalis.nl/record/504018
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Acoustic observations in the Bay of Biscay: Schooling, vertical distribution, species assemblages and behaviour ArchiMer
Masse, Jacques.
Eight acoustic surveys were carried our in the Bay of Biscay, during 1989-94, to study the distribution and abundance of anchovy (Engraulis encrasicolus, L.) in that area. Acoustic data were stored using the INES/MOVIES acquisition and processing system. Species-specific distribution patterns were confirmed through complementary sampling with a mid-water trawl. This paper summarises the combination of technical procedures used for acoustic assessments, and the results of acoustic surveys in the Bay of Biscay that pertain to the dynamics of this stock. Information is presented on the distribution and abundance of anchovy and co-occuring species, and on the movement patterns detected within the pelagic fish community, in relation to environmental conditions....
Tipo: Text Palavras-chave: Acoustic; Anchovy; Engraulis encrasicolus; Schooling; Pelagic; Behaviour; Bay of Biscay.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00191/30265/28719.pdf
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Analyse des petits pelagiques, sardine et anchois, dans le golfe de Gascogne ArchiMer
Coiffec, Gaelle; Duhamel, Erwan; Biseau, Alain; Danzart, Marc.
Since 1993 the yearly amounts of sardine landings for the Bay of Biscay fishing ports have experienced a constant increase (10,000 tonnes in 1993); on that account sardine is the first species landed in the fishing ports of the Bay of Biscay (15,000 tonnes in 2003). It is sold 0.54 € / kg (constant price over ten years) which means a 8,100 k€ turnover in 2003 and the 12th rank in value landed in the fishing ports of Bay of Biscay. Though anchovy landings have decreased over the last ten years, especially since 2001, this species occupies the 3rd rank of the highest landings (7,300 tonnes) of the Atlantic shoreline in 2003.The decrease of anchovy landings over the last ten years may account for the high increase of its constant sale price of 1.5 € / kg from...
Tipo: Text Palavras-chave: Purse seiner; Midwater pair trawler; Sardine; Anchovy; Pelagic; Bay of Biscay; Recrutement; Senneur; Chalutier pelagique; Bolincheur; Sardine; Anchois; Pelagique; Golge de Gascogne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2287.pdf
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Competition or cooperation in transboundary fish stocks management: Insight from a dynamical model ArchiMer
Nguyen-trong, Hieu; Brochier, Timothee; Auger, Pierre; Trinh, Viet Duoc; Brehmer, Patrice.
An idealized system of a shared fish stock associated with different exclusive economic zones (EEZ) is modelled. Parameters were estimated for the case of the small pelagic fisheries shared between Southern Morocco, Mauritania and the Senegambia. Two models of fishing effort distribution were explored. The first one considers independent national fisheries in each EEZ, with a cost per unit of fishing effort that depends on local fishery policy. The second one considers the case of a fully cooperative fishery performed by an international fleet freely moving across the borders. Both models are based on a set of six ordinary differential equations describing the time evolution of the fish biomass and the fishing effort. We take advantage of the two time...
Tipo: Text Palavras-chave: Shared fish stock; Aggregation of variables; ODE; Pelagic; Fisheries management; West Africa.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00442/55310/72108.pdf
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Direct assessment of anchovy by the PELGAS04 acoustic survey ArchiMer
Masse, Jacques; Beillois, Pierre; Duhamel, Erwan.
An acoustic survey was carried out in the bay of Biscay from April 27th to May 25th on board the French research vessel Thalassa. The objective of PELGAS04 survey was to study the abundance and distribution of pelagic fish in the Bay of Biscay. The target species were mainly sardine and anchovy but had to be considered in a multi-specific context. The results have to be used during ICES working groups in charge of the assessment of sardine, anchovy, mackerel and horse mackerel and in the frame of the Ifremer fisheries ecology program "resources variability".
Tipo: Text Palavras-chave: Pelagic; FOREVAR; Bay of Biscay; Anchovy; Acoustic; Survey; ICES; PELGAS; Pélagique; FOREVAR; Golfe Gascogne; Anchois; Acoustique; Campagne océanographique; CIEM; PELGAS.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-2295.pdf
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Ecosystem spatial structure revealed by integrated survey data ArchiMer
Petitgas, Pierre; Huret, Martin; Dupuy, Christine; Spitz, Jerome; Authier, Matthieu; Romagnan, Jean-baptiste; Doray, Mathieu.
Integrated marine survey series such as PELGAS provide comprehensive geo-referenced data over large sea areas in major ecosystem components with defined biological resolution and spatio-temporal sampling scale. These data enable to develop product at different levels of biological organization and spatial scale that are useful for ecosystem integrated assessments. Using the PELGAS integrated data series, we applied a generic procedure made of several steps to identify and map ecologically coherent ecosystem spatial units in the Bay of Biscay. First, the data were interpolated on a common spatial grid and organized as a time series of matrices containing at each time the variables as columns and the grid cell values as rows. The multi-table analysis method...
Tipo: Text Palavras-chave: Integrated surveys; Ecosystems; Spatial structure; Multi-factor analysis; Bay of Biscay; Pelagic.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00403/51402/51977.pdf
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Geographic distribution and description of four pelagic barnacles along the south east Pacific coast of Chile - a zoogeographical approximation RChHN
HINOJOSA,IVÁN; BOLTAÑA,SEBASTIÁN; LANCELLOTTI,DOMINGO; MACAYA,ERASMO; UGALDE,PABLA; VALDIVIA,NELSON; VÁSQUEZ,NELSON; NEWMAN,WILLIAM A; THIEL,MARTIN.
The majority of zoogeographic studies along the Chilean Pacific coast have focused on benthic organisms and oceanographic conditions are considered the main factors influencing their distributions. Herein we examined the geographic distribution of pelagic barnacles of the family Lepadidae collected from floating macroalgae at seven sampling areas between 23 and 50° S. Four species were encountered and they are briefly described herein. The most abundant northern species was Lepas anatifera, and it diminished in abundance towards the south (33° S). Moreover, this species was not found in waters with a sea surface temperature (SST) of less than ~18 °C. Lepas australis, primarily a circumpolar West Wind Drift species, diminished in abundance towards the north...
Tipo: Journal article Palavras-chave: Zoogeography; Lepas; Oceanography; Pelagic; Cirripedia.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000100002
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Physical-Chemical processes and Patterns of Diversity of the chilean eastern boundary pelagic and benthic marine ecosystems: An overview Gayana
Escribano,Rubén; Fernández,Miriam; Aranís,Antonio.
The biological diversity of the Chilean marine ecosystem (CME) has recently become an issue of interest to Chilean scientists and authorities concerned about the impact of human activities and ongoing climate change on the structure, functioning, and sustainable use of this large marine region, recognized as one of the most productive ecosystems of the world`s is oceans. In this paper, the available information is examined in order to describe the major environmental characteristics of the CME and its associated flora and fauna, both in the benthic and pelagic systems, with the main goal of identifying environmental discontinuities and boundaries which may serve to define biogeographical units and characterize their biodiversity patterns. Physical and...
Tipo: Journal article Palavras-chave: Biodiversity; Benthic; Chilean marine ecosystem; Conservation; Pelagic.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200008
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Reproduction of Brevoortia aurea (Spix & Agassiz, 1829) (Actinopterygii: Clupeidae) in the Mar Chiquita Coastal Lagoon, Buenos Aires, Argentina Neotropical Ichthyology
Lajud,Nicolás Agustín; Astarloa,Juan Martín Díaz de; González-Castro,Mariano.
ABSTRACT Reproductive biology of the Brazilian menhaden, Brevoortia aurea (Clupeiformes), was studied in Mar Chiquita Coastal Lagoon. Its abundance was analysed in relation to environmental variables, and the main biological-reproductive parameters were estimated: size at first maturity, batch and relative fecundity, frequency distribution of oocyte diameters and gonadosomatic index (GSI). Moreover, its reproductive cycle was analysed histologically. Samples were collected from May 2012 to April 2013. Once the spawning period was detected, extra samples were added (October and November 2013). The specimens were caught with gillnets, at a distance of 2,300 meters from the mouth of the lagoon. The highest abundances were observed in the months of October and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clupeiformes; Multiple spawner; Pelagic; Reproduction.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100222
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Technical mitigation measures for sharks and rays in fisheries for tuna and tuna-like species: turning possibility into reality ArchiMer
Poisson, Francois; Abascal Crespo, Francisco; Ellis, Jim R.; Chavance, Pierre; Pascal, Bach; Santos, Miguel. N.; Seret, Bernard; Korta, Maria; Coelho, Rui; Ariz, Javier; Murua, Hilario.
Tuna fisheries have been identified as one of the major threats to populations of other marine vertebrates, including sea turtles, sharks, seabirds and marine mammals. The development of technical mitigation measures (MM) in fisheries is part of the code of conduct for responsible fisheries. An in-depth analysis of the available literature regarding bycatch mitigation in tuna fisheries with special reference to elasmobranchs was undertaken. Studies highlighting promising MMs were reviewed for four tuna fisheries (longline, purse seine, driftnets and gillnet, and rod and line – including recreational fisheries). The advantages and disadvantages of different MMs are discussed and assessed based on current scientific knowledge. Current management measures for...
Tipo: Text Palavras-chave: Mitigation; Elasmobranch; Bycatch; Pelagic; Mortality; Tuna regional fishery management organizations.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00364/47474/47493.pdf
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The known and unknown about Marine Biodiversity in Ecuador (Continental and Insular) Gayana
Cruz,Manuel; Gabor,Nikita; Mora,Elba; Jiménez,Roberto; Mair,James.
Ecuador has a high diversity of ecosystems in its coastal and marine territory with beaches, bays, estuaries, cliffs, coastal lagoons and rocky coasts being the most representative. So far, 1,859 marine species have been identified in Ecuador. Of these, 1380 species of non-commercial marine invertebrates and vertebrates, belonging to 8 Phyla and distributed in 25 groups or classes, occur along the coast of Ecuador. These are: Protozoans, 9 groups: Oceanic and estuarine Diatoms, Cyanophyta, Chlorophyta, Dinoflagellates, Coccolithophorida, Silicoflagellates, Euglenophyta, Tintinnids and planktonic and benthic Foraminifera; Cnidaria, 2 classes: Hydromedusae and Scyphomedusae; Mollusca, 5 classes: Wood-boring molluscs and rock-boring and benthic bivalves;...
Tipo: Journal article Palavras-chave: Biodiversity; Pelagic; Demersal; Benthic; Gulf of Guayaquil.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200010
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Towards an Autonomous Pelagic Observatory: Experiences from Monitoring Fish Communities around Drifting FADs ArchiMer
Brehmer, Patrice; Sancho, Gorka; Trygonis, Vasilis; Itano, David; Dalen, John; Fuchs, Ariel; Faraj, Abdelmalek; Taquet, Marc.
This work presents a methodological synthesis for the in situ monitoring of fish aggregating devices (FADs) using a combination of optical, echosounder and SCUBA observations conducted in the vicinity of drifting FADs. The acoustic methods allowed, according to the devices used, the description of the spatial organisation and dynamics of biotic scattering layers, individual fishes, schools, shoals and mammals, while visual, photographic and video observations permitted species identification within a range of 0 to ~ 25 m. Based on these results, we elaborate on the interest to combine acoustic and visual methods, and present an autonomous instrumented drifting buoy for remotely monitoring fish diversity and abundance in the pelagic ecosystems. The...
Tipo: Text Palavras-chave: Optical; Census; Acoustics; Buoy; Seaorbiter; Biomonitoring; Conservation; Environmental monitoring; Fish; Pelagic.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00461/57252/59265.pdf
Registros recuperados: 12
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