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Influence of the NAO on the northwestern Mediterranean wave climate

Cañellas, Bartomeu; Orfila Förster, Alejandro; Méndez Incera, Fernando Javier; Álvarez Díaz, Alberto; Tintoré Subirana, Joaquín
Fonte: Instituto de Ciencias del Mar Publicador: Instituto de Ciencias del Mar
Tipo: info:eu-repo/semantics/article; publishedVersion
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RESUMEN. Influencia de la nao en el clima marítimo del Mediterráneo noroccidental. – El presente trabajo estudia las teleconexiones entre la Oscilación del Atlántico Norte (NAO ) y el clima marítimo en el Mediterráneo noroccidental, definido por la media mensual de la altura significante (SWH) y la media mensual de la altura significante correspondiente al percentil 95 (percentil 95 SWH), en el período comprendido entre 1958 y 2001. Los datos analizados corresponden al retroanálisis de 44 años de datos atmosféricos, dentro del marco del proyecto HIPOCAS . Estos datos han sido codificados en forma de EOF s para obtener la variabilidad espacio-temporal asociada a la NAO . Los datos utilizados han sido previamente blanqueados para evitar correlaciones ficticias entre las series, mediante el ajuste a un modelo autorregresivo de orden p. Los resultados muestran como el clima marítimo del Mediterráneo noroccidental está influenciado a escala mensual por las distintas fases de la NAO . Cuando la NAO está en su fase positiva, podemos observar anomalías positivas en la altura significante media mensual, así como en la altura de ola correspondiente al percentil 95, estas anomalías aparecen en la zona comprendida entre las Islas Baleares...

Geopolítica del mediterráneo

Salkin, Ives
Fonte: Universidad Militar Nueva Granada Publicador: Universidad Militar Nueva Granada
Tipo: journal; revistas Formato: application/pdf
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El mar Mediterráneo desempeñó un papel muy importante en el curso de los siglos, recordemos las imágenes que suscitó: La cuna de las civilizaciones, El corazón del mundo occidental, El punto de convergencia de tres continentes, El cruce de las razas, de las religiones, de las culturas.

Los intereses geopolíticos de España y Marruecos en la controversia fronteriza por los territorios ubicados en el Estrecho de Gibraltar – Mar Mediterráneo. En el periodo comprendido entre 1956 y 2002

Quintero Guerrero, Shery Katherine
Fonte: Facultad de Relaciones Internacionales Publicador: Facultad de Relaciones Internacionales
Tipo: info:eu-repo/semantics/bachelorThesis; info:eu-repo/semantics/acceptedVersion Formato: application/pdf
Publicado em 30/08/2010 Português
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El objeto de investigación geográficamente se circunscribe a España y Marruecos, bajo el análisis conceptual de la soberanía pretendida por ambos países de los territorios en disputa ubicados en el Mar Mediterráneo desde el Estrecho de Gibraltar hacia el este.; The research object is limited geographically to Spain and Morocco, under the conceptual analysis of sovereignty claimed by both countries in the disputed territories located in the Mediterranean Sea from the Strait of Gibraltar to the east.

The use of a square mesh codend and sorting grids to reduce catches of young fish and improve sustainability in a multispecies bottom trawl fishery in the Mediterranean; El uso de copo de malla cuadrada y rejillas separadoras para reducir las capturas de peces juveniles y mejorar la sostenibilidad de una pesquería multiespecífica de arrastre de fondo en el Mediterráneo

Sardà, Francisco; Molí Ferrer, Balbina; Bahamon, Nixon; Sardà-Palomera, Francesc
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 568860 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] In order to improve the capacity of bottom trawl fishing gears to reduce catches of young fish and discards in a highly exploited demersal trawl fisheries in the Mediterranean, the size-selection performance of a 36-mm square-mesh codend and two sorting grids with 20 and 15 mm bar spacing was assessed. Alternate hauls were used to assess the selectivity of 36-mm square-mesh codend. Selectivity of sorting grids was assessed using a double codend in which fish that escaped through the grid were captured in the lower codend while other fish were guided into the upper codend. The mean selection length (L50) for European hake was 18.5 cm and that for the Atlantic horse mackerel was 14.0 cm with the 36-mm square-mesh codend . These values are close to their current minimum landing sizes (20 cm for hake and 12 cm for horse mackerel). The sorting grid with 20-mm bar spacing showed L50 value of 13.3 cm for hake, suggesting that a larger grid-spacing would be needed to obtain sufficient sorting performance. Similarly, for Atlantic mackerel the estimated L50 of 14.3 cm indicates that larger grid spacing is required to attain an L50 that would be close to the current MLS (18 cm). For Atlantic horse mackerel and red mullet...

Origin and abundance of beach debris in the Balearic Islands; Origen y abundancia de residuos en las playas de las Islas Baleares

Basterretxea, Gotzon; Palmer, Miquel; Tintoré, Joaquín; Martínez Ribes, Lorena
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 362776 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] The abundance, nature and possible sources of litter on 32 beaches on the Balearic Islands (Mediterranean Sea) were investigated in 2005. Mean summer abundances in the Balearics reached approximately 36 items m-1, with a corresponding weight of 32±25 g m-1, which is comparable to the results of other studies in the Mediterranean. Multivariate analyses (principal component analysis and redundancy analysis) confirmed strong similarities between islands and a statistically significant seasonal evolution of litter composition and abundance. In summer (the high tourist season), debris contamination expressed as item abundance was double that in the low season and showed a heterogeneous nature associated with beach use. Cigarette butts were the most abundant item, accounting for up to 46% of the objects observed in the high tourist season. In contrast, plastics related to personal hygiene/medical items were predominant in wintertime (67%) and natural wood was the most important debris by weight (75%). In both seasons, litter characteristics suggested a strong relationship with local land-based origins. While beach users were the main source of summer debris...

Trawl catch composition during different fishing intensity periods in two Mediterranean demersal fishing grounds; Composición de la captura de arrastre en períodos con diferente intensidad de pesca en dos caladeros del Mediterráneo

Sánchez, Pilar; Recasens, Laura; Demestre, Montserrat; Sartor, Paolo; Ligas, Alessandro; Martín, Javier; Ranieri, Stefano de
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 226612 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN]The study was carried out in two fishing grounds on the Mediterranean continental shelf: one in the Adriatic Sea and one in the Catalan Sea. Samplings on board otter trawlers were performed from November 2002 to December 2003 in the Catalan Sea and from February 2003 to January 2004 in the Adriatic Sea. The Adriatic fishing ground was affected by high fishing intensity from January to June, while the Catalan area was highly exploited from September to February. Fishing activity in the Adriatic area was closed for 45 days, and 62 days in the Catalan area; both periods were in summer. Totals of 92 and 88 species were collected in the Adriatic and Catalan fishing grounds respectively. The species composition of the retained and discarded fractions showed close agreement between the two areas. Mullus barbatus showed very low discard rates in both areas, as well as Loligo vulgaris in the Catalan Sea and Merluccius merluccius in the Adriatic Sea. In both fishing grounds Squilla mantis showed high catch rates with low discards, except in March in the Catalan area. In the Adriatic Sea Liocarcinus depurator was characterized by large discard fractions. In both fishing grounds the retained fraction was slightly higher in the high fishing intensity periods than in the low intensity ones (Adriatic Sea: 0.613 vs 0.524; Catalan Sea: 0.597 vs 0.539)...

Fauna of the Mediterranean Hydrozoa; Fauna de hidrozoos del Mediterráneo

Bouillon, Jean; Medel, María Dolores; Pagès, Francesc; Gili, Josep Maria; Boero, Ferdinando; Gravili, Cinzia
Fonte: Consejo Superior de Investigaciones Científicas (España) Publicador: Consejo Superior de Investigaciones Científicas (España)
Tipo: Libro
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[EN] This study provides a systematic account of the hydrozoan species collected up to now in the Mediterranean Sea. All species are described, illustrated and information on morphology and distribution is given for all of them. This work is the most complete fauna of hydrozoans made in the Mediterranean. The fauna includes planktonic hydromedusae, benthic polyps stages and the siphonophores. The Hydrozoa are taken as an example of inconspicuous taxa whose knowledge has greatly progressed in the last decades due to the scientific research of some specialists in the Mediterranean area. The number of species recorded in the Mediterranean almost doubled in the last thirty years and the number of new records is still increasing. The 457 species recorded in this study represent the 12% of the world known species. The fauna is completed with classification keys and a glossary of terms with the main purpose of facilitating the identification of all Meditrranean hydrozoan species.; [ES] Este estudio proporciona una relación sistemática de las especies de hidrozoos conocidas hasta la actualidad en el mar Mediterráneo. Se describen e ilustran todas las especies de las cuales se ofrece información sobre su morfología y distribución. Este trabajo es la fauna mas completa de hidrozoos hecha en el Mediterráneo. Esta fauna incluye las hidromedusas planctónicas...

Tracking a big anticyclonic eddy in the western Mediterranean Sea

Font, Jordi; Isern-Fontanet, Jordi; Jesús Salas, José de
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 2824381 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] In May 1998 a big and deep open ocean anticyclonic eddy (AE 98-1) was sampled in the Algerian basin (western Mediterranean sea) in a region south of the Balearic islands. Fifteen surface Lagrangian buoys, tracked by satellite, were released across the eddy and were used for a few months to observe the continuity of the anticyclonic motion and the westward drift of the eddy. This kind of big and intense eddies in the Mediterranean can be detected by satellite altimeter radars. Using a new method, based on the Okubo-Weiss criterion, to identify mesoscale eddies in Sea Level Anomaly maps derived from measurements of the ERS and TOPEX/POSEIDON altimeters, an independent tracking of the same eddy was performed. There is a remarkable agreement between the two results despite the different nature of the information, mainly due to the fact that SLA maps contain interpolated and smoothed measurements while the drifter? trajectories are in situ data obtained from individual drifter fixes. The location of the eddy centre during two months with the two methods agrees within an average distance lower than the spatial resolution of the altimetric maps (0.2º). The size of the eddy...

Preservation of juvenile hake (Merluccius merluccius L) in the western Mediterranean demersal trawl fishery by using sorting grids; Preservación de juveniles de merluza (merluccius merluccius, l.) en la pesquería demersal de arrastre del Mediterráneo occidental, mediante el uso de rejillas separadoras

Sardà, Francisco; Palomera, Isabel; Molí Ferrer, Balbina
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 2272333 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] The Mediterranean fishery has experienced a decline in catches over the past 20 years due to an excessive increase in effort caused by both increased trawler engine power and rapid technological advances in fishing technology and fish location. This has led to overexploitation, in which immature individuals support an increasing portion of the catches. The present study was undertaken to test a sorting grid and square-mesh-panel as juvenile exclusion systems. Our experience was a pilot study of such a system in the western Mediterranean. The purpose of these exclusion systems was to help juvenile hake escape from the net. The results demonstrate that the use of sorting grids for small fish in trawl gears in the Mediterranean is an efficient and practical means of avoiding the capture and discarding of unwanted individuals, with escape rates of over 50% (ranging between 50 and 90%). The grids were efficient and useful for excluding hake (Merluccius merluccius) on bottoms located at depths between 50 and 300 m, where hake are found all year round. A bar spacing of 20 mm yielded escape rates of L50 at 18.8 cm TL (L25 = 16.8 cm and L75 = 20.9 cm). Panels made of square meshes achieved poorer results than the grids. The grid system was effective for most of the species caught in the study area.; [ES] Durante los últimos 20 años la pesca en el Mediterráneo ha experimentado un descenso de capturas al mismo tiempo que se detecta un excesivo incremento del esfuerzo...

An introduction to Mediterranean deep-sea biology; Introducción a la Biología del Mediterráneo profundo

Sardà, Francisco; Canals, Miquel; Tselepides, Anastasios; Calafat, Antoni; Flexas, María del Mar; Espino, Manuel; Tursi, Angelo
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1081956 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] This chapter presents the state of the art concerning the deep-sea Mediterranean environment: geology, hydrology, biology and fisheries. These are the fields of study dealt with in the scientific papers of this volume. The authors are specialists who have addressed their research to the Mediterranean deep-sea environment during the last years. This introduction is an overview but not an exhaustive review.; [ES] Este capítulo presenta los conocimientos que actualmente se tienen sobre el ambiente del Mediterráneo profundo: hidrología, geología, biología y pesquerías, que constituyen el ambiente sobre el cual se han desarrollado las aportaciones de este volumen. Los autores son especialistas que durante los últimos años han dirigido sus estudios al mar profundo. Esta introducción pretende dar una visión general pero no ser una revisión exhaustiva.; Peer reviewed

Deep-water fish assemblages in the Mediterranean Sea; Asociaciones de peces profundos en el Mediterráneo

D´Onghia, Gianfranco; Politou, Chrissi-Yianna; Bozzano, Anna; Lloris, Domingo; Rotllant, Guiomar; Sion, Letizia; Mastrototaro, F.
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1410414 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the structure and spatial distribution of the fish assemblages at depths between 600 and 4000 m. A total of 55 species (8 chondrichthyes and 47 teleost fish) were sampled, 38 of them in the Balearic Sea, 30 in the western Ionian and 37 in the eastern Ionian. Multivariate analysis showed a clear pattern of zonation with depth and geographic area. Three main assemblages were identified across the vertical gradient investigated: on the upper slope around a depth of 600 m, on the middle slope between 800 and 1300 m, and on the lower slope below 1300 m. The geographic characterisation of the ichthyofauna structure was mainly observed on the upper and middle slope. The highest abundance and biomass values were found at depths of 1000-1200 m due to the presence of larger species with high energy requirements, such as Alepocephalusrostratus, Mora moro and Galeus melastomus. On the middle slope, significant differences in the abundance, biomass and mean fish weight were detected between the three areas. Significant differences for these parameters were also shown between the middle and lower slope assemblages. A significant decrease in species richness and diversity was shown with increasing depth...

Mediterranean and Atlantic deep-sea fish assemblages: differences in biomass composition and size-related structure; Comunidades de peces de profundidad en el Mediterráneo y el Atlántico: diferencias en la composición de la biomasa y la estructura de tamaños

Massutí, Enric; Gordon, John D. M.; Moranta, Joan; Swan, Sarah C.; Stefanescu, Constantino
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 489570 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] Data obtained over a period of twenty years from 214 bottom trawls, towed on a single warp at depths between 402 and 1993 m in the western Mediterranean (Algerian and Balearic basins) and eastern North Atlantic (Rockall Trough and Porcupine Seabight), allowed a standardised comparison of density, biomass composition and size-related structure for both the whole fish fauna and for the most common species found within the deep-sea fish assemblages. All four areas are characterised by distinctly different and well-documented oceanographic conditions, biogeographical affinities and fishing exploitation. The results showed clear differences between the Atlantic and the Mediterranean deep-sea fish fauna, not only in density, species richness and composition, but also in the structure of the biomass that constitutes these assemblages. These differences are discussed in relation to environmental conditions and fishing pattern, which have determined the adaptive responses of both individual species and the whole ecosystem.; [ES] Los datos obtenidos a partir de 214 pescas de arrastre de fondo con un sólo cable, realizadas a lo largo de un período de veinte años en el Mediterráneo occidental (cuencas argelina y balear) y Atlántico nor-oriental (Rockall Trough y Porcupine Seabight)...

Deep-sea distribution, biological and ecological aspects of Aristeus antennatus (Risso, 1816) in the western and central Mediterranean Sea; Distribución profunda, aspectos biológicos y ecológicos de Aristeus Antennatus (Risso, 1816) en el Mediterráneo Occidental y Central

Sardà, Francisco; Maiorano, Porzia; Company, Joan B.; D´Onghia, Gianfranco; Politou, Chrissi-Yianna
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1243739 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] The object of the DESEAS Project, funded by the EC, was to gather preliminary data on the abundance and maximum depth distribution of the rose shrimp Aristeusantennatus in the Mediterranean Sea. An exploratory survey was therefore designed with that goal in mind and conducted on the R/V García del Cid, sampling the maximum depths in three specific areas in the central and western Mediterranean, one off Ibiza (Balearic Islands), one off Calabria (western Ionian Sea), and one off the southern Peloponnesian Peninsula (Gulf of Kalamata, eastern Ionian Sea). The depths sampled ranged from 600 to 4000 m, with specimens of A. antennatus being collected down to 3300 m. There were three distinct boundaries marking the abundance of this species: < 1000 m, relatively high abundance (up to 1000 ind km-2); 1000-1500 m, relatively moderate abundance (up to 300 ind km-2); and > 1500 m, relatively low abundance (<100 ind km-2). The known population structure of this shrimp species, with increasing proportions of males and juveniles with depth, was also recorded in the deep-sea regions in other areas of the Mediterranean. No evidence of any differences in gonad development or in the presence of spermatophores carried by females was found in any of the three sampling areas. Lastly...

Chondrichthyes species in deep waters of the Mediterranean Sea; Especies de condrictios en aguas profundas del mar Mediterráneo

Bozzano, Anna; D´Onghia, Gianfranco; Sion, Letizia; Capezzuto, Francesca; Panza, Michele
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1461877 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the distribution and abundance of chondrichthyes species at depths between 600 and 4000 m. A total of 8 chondrichthyes species were recorded, 5 of them in the Balearic Sea, 4 in the western Ionian and 6 in the eastern Ionian. A decrease in abundance with depth was observed in each species with the exception of Centroscymnuscoelolepis. The most abundant species were Galeus melastomus and Etmopterusspinax. The depth range of some species was updated. G. melastomus was caught down to 1500 m, exhibiting a smaller-deeper pattern in females, while E.spinax was captured down to 2200 m with a bigger-deeper trend. Mature females of these two sharks were found between 600 and 1500 m. A wide size-range was shown in both species. C.coelolepis was only collected in the Balearic Sea down to 2800 m. The presence of a pregnant female was sampled from a depth of 1500 m. The distribution of the species is discussed in the context of the present knowledge of the Mediterranean ichthyofauna.; [ES] Para describir la distribución y abundancia de las especies de condrictios a profundidades entre 600 y 4000 m...

Observations on the distribution, population structure and biology of Bathypterois mediterraneus Bauchot, 1962 in three areas of the Mediterranean Sea; Observaciones sobre la distribución, estructura de la población y biología de Bathypterois Mediterraneus Bauchot, 1962 en tres áreas del Mar Mediterráneo

D´Onghia, Gianfranco; Sion, Letizia; Capezzuto, Francesca; Lloris, Domingo; Labropoulou, Mary
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1307093 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] During the DESEAS cruise Bathypterois mediterraneus specimens were sampled in the Balearic Sea between 1000 and 2800 m as well as in the western and eastern Ionian Sea from 800 to 3300 m and from 800 to 2600 m respectively. The species was found to be more abundant at depths of 1500-2000 m. The size-range was 26-190 mm and the most abundant size class was around 100-120 mm standard length. No significant size-depth trends were shown for either length or weight. Negative allometry was shown in the growth of fishes and otoliths and in the relationship between fish length and otolith size in the samples from the western and eastern Ionian Sea. In these two areas the absolute growth was estimated by adopting the Von Bertalanffy function (western Ionian: SL∞ = 194.3 ± 38.51 mm, k = 0.146 ± 0.061/year, t0 = - 0.921 ± 0.699, f' = 3.74; eastern Ionian: SL∞ = 180.23 ± 63.36 mm, k = 0.150 ± 0.112/year, t0 = - 0.968 ± 0.868, f ' = 3.70). Although most of the specimens were immature, some ripe gonads were recorded in individuals greater than 104 mm in standard length, confirming the simultaneous hermaphroditism in this fish. The results are discussed in relation to previous observations on the life strategy of B.mediterraneus in the Mediterranean Sea.; [ES] Durante la campaña DESEAS se obtuvieron especímenes de Bathypterois mediterraneus en el mar Balear entre 1000 y 2800 m así como en el mar Iónico occidental y oriental entre 800 y 3300 y entre 800 y 2600 m...

New records of deep-water teleost fish in the Balearic Sea and Ionian Sea (Mediterranean Sea); Nuevas citas de peces teleósteos de aguas profundas en los mares Balear e iónico (Mar Mediterráneo)

D´Onghia, Gianfranco; Lloris, Domingo; Sion, Letizia; Politou, Chrissi-Yianna; Dokos, John
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
Tipo: Artículo Formato: 1304958 bytes; application/pdf
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] During an EC-funded research carried out in the Mediterranean Sea deep-water fish (600-4000 m) were collected in the Balearic Sea as well as the western and eastern Ionian Sea. Caelorhynchusmediterraneus is a new record for the Balearic Sea, Cyclothone braueri, Hygophum benoiti, Paralepis speciosa, Chalinura mediterranea, Coryphaenoides guentheri, C. mediterraneus, Lepidion lepidion and Cataetyx laticeps for the western Ionian Sea, and Polyacanthonotus rissoanus, C. guentheri, C. mediterraneus, L. lepidion and C. laticeps for the eastern Ionian Sea. The bathymetric distribution of other species has been updated. Species richness decreased with depth in the three surveyed areas, showing a significant shift below 1500 m. At depths greater than 1000 m macrourid and morid species were dominant except in the Balearic Sea, where Alepocephalus rostratus was found to be very abundant as deep as 1500 m. At depths greater than 1500 m the dominant species were Bathypterois mediterraneus, C. mediterranea and C. guentheri. The results of this research confirm the scarcity of deep fish fauna in the Mediterranean compared to the Atlantic. For the greatest depths are concerned...

Using stable isotopes of nitrogen and carbon to study seabird ecology: applications in the Mediterranean seabird community; El empleo de isótopos estables de nitrógeno y carbono para estudiar la ecología de las aves marinas: aplicaciones a la comunidad de aves marinas del mediterráneo

Forero, Manuela G.; Hobson, Keith A.
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] The application of the stable isotope technique to ecological studies is becoming increasingly widespread. In the case of seabirds, stable isotopes of nitrogen and carbon have been mainly used as dietary tracers. This approach relieson the fact that food web isotopic signatures are reflected in the tissues of the consumer. In addition to the study of trophic ecology, stable isotopes have been used to track the movement of seabirds across isotopic gradients, as individuals moving between isotopically distinct foodwebs can carry with them information on the location of previous feeding areas. Studies applying the stable isotope methodology to the study of seabird ecology show a clear evolution from broad and descriptive approaches to detailed and individual-based analyses. The purpose of this article is to show the different fields of application of stable isotopes to the study of the seabird ecology. Finally, we illustrate the utility of this technique by considering the particularities of the Mediterranean seabird community, suggesting different ecological questions and conservation problems that could be addressed by using the stable isotope approach in this community.; [ES] La aplicación de la medición de isótopos estables a los estudios ecológicos es cada vez más frecuente. En el caso de las aves marinas...

Seabird mortality from longline fishing in the Mediterranean Sea and Macaronesian waters: a review and a way forward; Mortalidad de aves marinas en palangres del mar mediterráneo e islas macaronesias: revisión y propuestas de futuro

Cooper, John; Baccetti, Nicola; Belda, Eduardo Jorge; Borg, John J.; Oro, Daniel; Papaconstantinou, Costas; Sánchez, Antonio
Fonte: CSIC - Instituto de Ciencias del Mar (ICM) Publicador: CSIC - Instituto de Ciencias del Mar (ICM)
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Publicación online disponible en: http://www.icm.csic.es/scimar/index.php; [EN] A country-by-country review of seabird mortality from longline fishing in the Mediterranean Sea and in Macaronesian waters shows a paucity of data. Of 12 Mediterranean countries known to undertake longlining, seabird mortality is only reported for six: France, Greece, Italy, Malta, Spain and Tunisia. Seabird mortality from longlining has been reported from the Azores (Portugal) but not from the other Macaronesian Islands. Only for one country, Spain, is information on the levels of mortality available, suggesting that 4-6% of the local breeding population of Cory´s shearwater Calonectris diomedea may be killed annually, a level considered unsustainable for the long-term persistence of colonies. Cory´s shearwater is the most commonly affected species, although a number of Larus gull species are also being caught. There is insufficient knowledge to conclude whether any seabird species is at conservation risk within the region, but concern is expressed for Cory´s shearwater. It is recommended that Mediterranean and Macaronesian countries conduct assessments of their longline fisheries and seabird mortality in terms of the Food and Agriculture Organization´s International Plan of Action - Seabirds. Regional fishery organisations...

Overview on artificial reefs in Europe

Fabi, Gianna; Spagnolo, Alessandra; Bellan-Santini, Denise; Charbonnel, Eric; Çiçek, Burak Ali; García, Juan J. Goutayer; Jensen, Antony C.; Kallianiotis, Argiris; Santos, Miguel Neves dos
Fonte: Universidade de São Paulo. Instituto Oceanográfico Publicador: Universidade de São Paulo. Instituto Oceanográfico
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/2011 Português
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Artificial reefs in Europe have been developed over the last 40 yrs. Most of these reefs have been placed in the Mediterranean Sea, but there is an increasing interest on the part of northern European countries. Fish stock enhancement and fishery management are the main purposes of reef construction in the Mediterranean Sea and on the Atlantic coast of the Iberian Peninsula, while nature conservation/restoration, research, and recreation have been the main purposes served in the other European regions to date. Artificial reef deployment falls under some general regulations concerning the protection of the sea against pollution due to the dumping of unsuitable materials. Specific Regional Plans relating to the use of artificial reefs in the marine environment and Guidelines for reef construction have been derived from these general regulations. In spite of recent developments, national and/or regional programs for the deployment of artificial reefs and/or their inclusion in overall management plans for integrated management of coastal zones are in force only in the majority of Mediterranean countries, while only a few projects have, to date, been undertaken in the other European Regions. Moreover, there is a noteworthy lack of plans...

Efectos de la perturbación crónica por la pesca de arrastre sobre la producción secundaria de las comunidades suprabénticas e infaunales de crustáceos en el Mar Adriático (Mediterráneo NO)

Ligas,A; De Biasi,AM; Demestre,M; Pacciardi,L; Sartor,P; Cartes,JE
Fonte: Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas Publicador: Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2009 Português
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Las artes de pesca de arrastre pueden tener varios tipos de efectos sobre los ecosistemas bénticos. Considerando que los organismos pequeños y las especies bénticas con mayores tasas de crecimiento y menores expectativas de vida pueden soportar la mortalidad por pesca y beneficiarse de una reducción en la competencia o depredación, la pesca de arrastre puede propiciar su proliferación y, por ende, resultar en una pérdida de biomasa y un incremento en producción, ya que las especies de menor talla son más productivas que las de mayor tamaño. En el presente estudio se evalúan los efectos, si es que los hay, de la pesca de arrastre sobre las tasas de producción de la macrofauna béntica. Los muestreos se realizaron en dos sitios adyacentes en la parte central del Mar Adriático (Mediterráneo central), uno impactado por actividad de pesca y otro no. Se estimaron la producción y la razón producción/biomasa (P/B) de 13 especies de crustáceos peracáridos y eucáridos mediante el método de frecuencia de tallas de Hynes. Las estimaciones para ambios sitios se compararon para probar la hipótesis de que los valores de producción y P/B deberían de ser mayores en la zona de pesca que en la zona de exclusión a la pesca. Los resultados indican que los efectos sobre las especies son más complejos que los esperados en relación a esta hipótesis...