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Registros recuperados: 26
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A new interstitial species of Gammarella (Amphipoda, Gammaridea) from the western Mediterranean Sea Naturalis
Martí, Amparo; Villora-Moreno, Santiago.
A new species of Gammarella Bate, 1857 is described from shallow water, inhabiting the interstitial system in soft bottoms of the Chafarinas Archipelago (western Mediterranean, N. Africa). The relationships of Gammarella with the genera Nuuanu and Cottesloe are briefly discussed. Numerical taxonomie methods are utilized to differentiate between the morphologically related species and the intermediate species. In a table the principal differentiating characters of Gammarella species are presented. Gammarella garciai n. sp. is characterized by its intermediate position between Gammarella, Nuuanu and Cottesloe, showing an intergradation of characters. Gammarella garciai n. sp. and G. merringannee show ecologically intermediate characters between the larger...
Tipo: Article / Letter to the editor Palavras-chave: Chafarinas Archipelago; Western Mediterranean; Marine Amphipoda; Taxonomy; Gammarella; New species.
Ano: 1995 URL: http://www.repository.naturalis.nl/record/504286
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Algal flora associated with a Halophila stipulacea (Forsskal) Ascherson (Hydrocharitaceae, Helobiae) stand in the western Mediterranean ArchiMer
Rindi, F; Maltagliati, F; Rossi, F; Acunto, S; Cinelli, F.
Halophila stipulacea, a seagrass introduced into the Mediterranean Sea as a Lessepsian immigrant, is nowadays common in the eastern Mediterranean, and it was recently recorded in the western Mediterranean; very little information is available about the algal flora associated with this species. During a survey of a Halophila stipulacea stand at Vulcano Island (Eolian Islands, western Mediterranean), samples were collected at three depths (5 m, 15 m and 25 m) for identification of algal epiphytes. Thirty-six species of macroalgae were found. The epiflora of the leaves consisted of 20 species, the others being mixed with or entangled in the rhizomes. On the leaves, Ceramium tenerrimum, Dasya corymbifera, Polysiphonia cfr. tenerrima, Spyridia filamentosa,...
Tipo: Text Palavras-chave: Halophila stipulacea; Épiphytes algaux; Épiphytisme; Algues marines; Méditerranée occidentale; Halophila stipulacea; Seagrass epiphytes; Epiphytism; Marine algae; Western Mediterranean.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43605/43924.pdf
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Contraintes par imagerie sismique pénétrante sur l'évolution d'une marge Cénozoïque réactivée en compression (cas de la marge algérienne, secteur de Tipaza) ArchiMer
Lepretre, Angelique.
The inversion of passive margins appears to be one of the first steps towards the initiation of new subduction zones. This crucial step in plate tectonics nevertheless still raises many questions. The study of margins currently reactivated by compressional tectonics is thus essential to better understand this process. These margins are uncommon, located in different geodynamic settings, and the factors determining their evolution are poorly constrained. The Algerian margin, located in North Africa, is one of handful of modern examples worldwide. The evolution of this margin, rifted during the Miocene, in a back-arc setting, is part ofthe complex puzzle of the western Mediterranean. Since a few million years, the margin has suffered inversion and...
Tipo: Text Palavras-chave: Marge algérienne; Structure crustale; Réactivation en compression; Bassin arrière-arc; Méditerranée Occidentale; Sismique-réflexion marine; Sismique grand-angle; Algerian margin; Crustal structure; Compressional reactivation; Back-arc basin; Western Mediterranean; Marine reflection-seismic profiles; Wide-angle seismic profile.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00498/60955/64358.pdf
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Discovery of Messinian Canyons and new seismic stratigraphic model, Offshore Provence (SE France): implications for the hydrographic network reconstruction ArchiMer
Tassy, A.; Fournier, F.; Munch, P.; Borgomano, J.; Thinon, I.; Fabri, Marie-claire; Rabineau, M.; Arfib, B.; Begot, J.; Beslier, M. -o; Cornee, J. -j.; Fournillon, A.; Gorini, C.; Guennoc, P.; Leonide, P.; Oudet, J.; Paquet, F.; Sage, F.; Toullec, R..
The interpretation of high-resolution 2D marine seismic profiles together with the analysis of sea-bottom cores allowed a stratigraphic and structural framework of the Provence continental shelf to be proposed. The integration of onshore and offshore stratigraphy, structure and geomorphology provided new insights into Messinian paleotopography and paleohydrography. A geological map of the offshore Provence continental shelf, isobath map of the base Plio-Quaternary surface are presented for the first time in this area. The base Plio-Quaternary surface is a polyphased unconformity that is composed of deep canyons developed by fluvial erosion during the Messinian event, and wave-cut surfaces formed during post-Messinian transgressions. The study evidenced a...
Tipo: Text Palavras-chave: Western Mediterranean; Provence continental shelf; Base Plio-Quaternary surface; Submarine canyon; Karst; Offshore seismic data; Shallow coring; Geological mapping.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00189/30027/28512.pdf
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Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin) ArchiMer
Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Aslanian, Daniel; Labails, Cinthia; Rabineau, Marina.
The formation of rifted continental margins has long been explained by numerous physical models. However, field observations are still lacking to validate or constrain these models. This study presents major new observations on the broad continental margin of the Gulf of Lions, based on a large amount of varied data. Two contrasting regions characterize the thinned continental crust of this margin. One of these regions corresponds to a narrow rift zone (40–50 km wide) that was highly thinned and stretched during rifting. In contrast with this domain, a large part of the margin subsided slowly during rifting and then rapidly after rifting. The thinning of this domain cannot be explained by stretching of the upper crust. We can thus recognize a zonation of...
Tipo: Text Palavras-chave: Subsidence; Passive margins; Back-arc; Rifting; Erosion; Stretching; Thinning; Western Mediterranean; Gulf of Lions.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00001/11230/7736.pdf
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Facteurs de contrôle sur le fonctionnement du système turbiditique du Rhône depuis le Dernier Maximum Glaciaire ArchiMer
Lombo Tombo, Swesslath.
Turbidite systems are accumulations of fluvial sediment on the continental margins. They are mainly made of « turbidites » deposited after the flow of turbidity currents inside submarine canyons and channels. Their structure and composition are controlled by global and regional environmental changes such as sea level and climate. The two fundamental parameters that govern their functioning are the production of sediment in the river watersheds and the capability and reactivity of the transfer to the turbidite system. In this work we show that for the last 24,000 years the functioning of the Rhone turbidite system has shown rapid changes under the control of sea level and sediment production fluctuations. Our results are based on a millennial time-scale...
Tipo: Text Palavras-chave: Hyperpycnite; Turbidites; Système turbiditique du Rhône; Facteurs de contrôle; Niveau marin; Climat; Morphologie; Golfe du Lion; Méditerranée occidentale; Hyperpycnites; Turbidites; Rhone turbidite system; Control factors; Sea level; Climate; Morphology; Gulf of Lions; Western Mediterranean.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00274/38505/37013.pdf
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Growth estimation of Merluccius merluccius off the northern coast of Tunisia ArchiMer
Khoufi, Widien; Dufour, Jean-louis; Jaziri, Hela; Elfehri, Safouene; Elleboode, Romain; Bellamy, Elise; Ben Meriem, Sadok; Romdhane, Mohamed Salah; Mahe, Kelig.
Growth parameters of any species are fundamental for biological or dynamic studies. The quality of the estimation for these parameters directly impacts on species stock assessment and, as a consequence, on fisheries management. In order to improve fishery and species stock management, growth analysis, especially by sex, is recommended. In this study, otoliths were used to estimate growth parameters of Merluccius merluccius Rafinesque, 1810. Hake is well-known as being a species in which otolith interpretation is extremely difficult. To estimate growth parameters, the first daily increment was validated as the tool for age determination. Otolith interpretation was done according to the last results of ICES cooperative research report. In total, a sample of...
Tipo: Text Palavras-chave: Merlucciidae; Merluccius merluccius; Tunisia; Western Mediterranean; Age estimation; Growth model; Otolith.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00191/30238/28662.pdf
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Impact of relative sea level and rapid climate changes on the architecture and lithofacies of the Holocene Rhone subaqueous delta (Western Mediterranean Sea) ArchiMer
Fanget, Anne-sophie; Berne, Serge; Jouet, Gwenael; Bassetti, Maria-angela; Dennielou, Bernard; Maillet, Gregoire M.; Tondut, Mathieu.
The modern Rhone delta in the Gulf of Lions (NW Mediterranean) is a typical wave-dominated delta that developed after the stabilization of relative sea level following the last deglacial sea-level rise. Similar to most other deltas worldwide, it displays several stacked parasequences and lobes that reflect the complex interaction between accommodation, sediment supply and autogenic processes on the architecture of a wave-dominated delta. The interpretation of a large set of newly acquired very high-resolution seismic and sedimentological data, well constrained by 14C dates, provides a refined three-dimensional image of the detailed architecture (seismic bounding surfaces, sedimentary facies) of the Rhone subaqueous delta, and allows us to propose a...
Tipo: Text Palavras-chave: Delta; Holocene; Maximum Flooding Surface; Sea level; Tempestites; Western Mediterranean.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00179/29017/27445.pdf
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Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) ArchiMer
Lafosse, M.; Gorini, C.; Le Roy, P.; Alonso, B.; D'Acremont, E.; Ercilla, G.; Rabineau, Marina; Vazquez, J. T.; Rabaute, A.; Ammar, A..
In active basins, tectonics can segment the continental shelf and control its stratigraphic architecture and physiography. Segmentation can explain the local evolution and morphology of the continental shelf because of sea-level variations, local tectonic segmentation and hydrodynamic processes. Here we investigate the tectonically active Morocco continental margin (southern Alboran Sea) using high-resolution seismic profiles and multibeam bathymetric data. The active faults bounding the transtensive Nekor basin triggered the segmentation of the shelf into three sectors showing different subsidence rates: a western sector corresponding to an extensive fault relay, a central sector corresponding to the subsiding Al-Hoceima Bay and an eastern sector...
Tipo: Text Palavras-chave: Seismic stratigraphy; Active tectonic; Pleistocene; Continental shelf; Swath bathymetry; Geomorphology; Western Mediterranean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56232/57812.pdf
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Mesoscale and Sub-Mesoscale structures observed during High resolution surveys in Western Mediterranean Basin ArchiMer
Garreau, Pierre; Dumas, Franck; Louazel, Stephanie; Correard, Stephanie.
The Mediterranean Sea is often referred as a “pocket ocean” exhibiting many processes that are primary interest the global ocean circulation given the opportunity to investigate a large panel of oceanic features in a relatively restrained area. Recent field experiments based on the multi-plateform integrated monitoring MOOSE or on intensive targeted experiment HYMEX revisited the hydrology and the dynamics of the Western Basin. Such approaches emphasized the ubiquity of the fine scale dynamics in the Mediterranean dynamics. An overview of the observed processes during 5 recent fields experiments are  presented and discussed regarding meso- and submeso-scale processes.
Tipo: Text Palavras-chave: Mesoscale phenomena; Western Mediterranean; Fronts.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00582/69398/67247.pdf
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Microbial activity at the deep water sediment boundary layer in two highly productive systems in the Western Mediterranean: the Almeria-Oran front and the Malaga upwelling ArchiMer
Bianchi, A; Calafat, A; De Wit, R; Garcin, J; Tholosan, O; Cacho, I; Canals, M; Fabres, J; Grout, H; Masque, P; Sanchez-cabeza, Ja; Sempere, R.
Microbiological and biogeochemical studies were carried out in sediments and near bottom waters in the upwelling area off the Malaga coast and in the Almeria-Oran frontal zone. In these nutrient-rich conditions, metabolic activity is potentially limited by oxygen availability through the sediment depth. In the surficial sediments of the frontal zone, however, oxygen penetrated to a depth of 4 cm, allowing oxic mineralisation processes to occur throughout the layer. In the surficial sediments of the upwelling area, oxygen penetration was limited to the top 2.5 cm, leading to anoxic conditions. Glutamate respiration and global oxygen uptake rates were clearly higher than in the frontal zone. In the superficial sediments of the frontal zone, bacteria were...
Tipo: Text Palavras-chave: Taux de minéralisation; Sédiments; Eaux profondes; Méditerranée occidentale; Bacteria; Mineralisation rate; Sediments; Deep-sea; Western Mediterranean.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43298/43034.pdf
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Morphology of retrogressive failures in the Eastern Rhone Interfluve during the Last Glacial Maximum (Gulf of Lions, Western Mediterranean) ArchiMer
Badhani, Shray; Cattaneo, Antonio; Dennielou, Bernard; Leroux, Estelle; Colin, Florent; Thomas, Yannick; Jouet, Gwenael; Rabineau, Marina; Droz, Laurence.
The Gulf of Lions (NW Mediterranean Sea) is a SW-NE oriented passive continental margin formed since the Oligocene. It presents small to large scale mass movement features suggesting a long history of seafloor instability. Of particular interest are the two surficial large mass-transport deposits along the Rhone turbiditic levee, known as the Rhone Eastern and Western Mass-Transport Deposits (REMTD and RWMTD). With the help of the recently acquired multi-beam bathymetric, sub-bottom profiler, high-resolution seismic and sedimentological data, we investigate the morphology, timing, kinematics, and possible triggering mechanisms of the source area of the REMTD, which we refer to as the Eastern Rhone Interfluve Slide (ERIS). ERIS has an estimated run-out...
Tipo: Text Palavras-chave: Submarine landslide; Mass transport deposits; Gulf of Lions; Western Mediterranean; Turbiditic levees.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00592/70396/68480.pdf
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Phylogeny and biogeography of midwife toads (Alytes, Discoglossidae): a reappraisal Naturalis
Altaba, Cristian R..
The allozyme data base of Arntzen & García-París (1995) on midwife toads (Alytes, Discoglossidae) is reanalysed considering each locus as a discrete character. The phylogeny thus inferred differs from the one obtained with genetic distances in the position of A. dickhilleni from the Betic region – it appears that its sister species is the widespread A. obstetricans, not the Mallorcan endemic A. muletensis. This phylogenetic hypothesis agrees with the taxonomic treatment of the genus based on morphology. A testable biogeographic hypothesis is proposed to account for the diversification of midwife toads in Iberia and the Balearics. The postulated underlying geological changes were the spread of inland saline lakes that divided Iberia (16 mY B.P.), the...
Tipo: Article / Letter to the editor Palavras-chave: Alytes; Midwife toads; Taxonomy; Phylogeny; Biogeography; Western Mediterranean; Iberia; Balearic Islands.
Ano: 1997 URL: http://www.repository.naturalis.nl/record/504192
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Sea-level control on turbidite activity in the Rhone canyon and the upper fan during the Last Glacial Maximum and early Deglacial ArchiMer
Lombo Tombo, Swesslath; Dennielou, Bernard; Berne, Serge; Bassetti, Maria-angela; Toucanne, Samuel; Jorry, Stephan; Jouet, Gwenael; Fontanier, Christophe.
The timing, routing and processes of sediment transfer from the continents to the oceans at millennial time-scale are still largely unknown. The potential of turbidite systems (dominantly deposited during sea-level lowstands) to record global or regional environmental fluctuations is usually under-exploited because of the difficulty to obtain robust chronostratigraphic constraints in turbiditic deposits, and therefore to tie changes in sedimentary processes to environmental fluctuations. We were able to obtain a millennial-scale chronostratigraphy based on oxygen isotopes of the scarce foraminifera preserved in turbiditic deposits of the Rhone Turbidite System within the Western Mediterranean. Our results show that 1) objective criteria can be defined for...
Tipo: Text Palavras-chave: Rhone Turbidite System; Turbidites; Hyperpycnite; Sea level; Last Glacial Maximum; Western Mediterranean.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00266/37712/35730.pdf
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Seasonal and interannual variability of zooplankton community in waters off Mallorca island (Balearic Sea, Western Mediterranean): 1994-1999 ArchiMer
Fernandez De Puelles, Ml; Pinot, Jm; Valencia, J.
During 1994-1999, the mesozooplankton community was sampled monthly in the upper sea layer (up to 100 m) along a cross-shelf transect of three stations in waters off Mallorca island. Copepods formed the most abundant group (54%) followed by appendicularians (17%), cladocerans and meroplankton larvae (13%). The abundance of all these groups decreased in the offshore direction but it was not the case for other zooplankton groups. A clear seasonal cycle was evident consisting of a general decrease of the abundance from the beginning to the end of the year. In addition to the general increase during late winter and spring, an absolute maximum was detected in May, particularly important at the neritic station and a relative maximum in March and October. During...
Tipo: Text Palavras-chave: Mer des Baléares; Copépodes; Hydrolique; Zooplancton; Méditerranée occidentale; Balearic Sea; Copepods; Hydrography; Zooplankton; Western Mediterranean.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43257/42988.pdf
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Seasonal variation in copepod abundance in relation to other zooplanktonic groups in the northwestern Mediterranean Naturalis
Kouwenberg, Juliana H.M..
Abundance of adult copepods and late copepodid stages from the upper 50 m in the Golfe du Lion (N.W. Mediterranean) was studied by the author in 1986, 1987, and 1988 for each season. Altogether 87 stations at 22 fixed locations were sampled in the frame of the multidisciplinary French/Spanish programme Pélagolion/Leopel in the near-coastal region (≤ 25 m bottom depth), the Rhone dilution zone, the neritic region (≤ 200 m bottom depth), and the oceanic region (200—2000 m bottom depth). Abundance of other zooplanktonic groups was estimated and total zooplankton biomass was determined for the upper 50 m. Copepod abundance was highest during September 1986 (all regions) and July 1987 (neritic). Total biomass was highest during July 1987 and May/June 1988,...
Tipo: Article / Letter to the editor Palavras-chave: Copepods; Copepod distribution; Zooplankton biomass; Western Mediterranean.
Ano: 1993 URL: http://www.repository.naturalis.nl/record/504106
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Sedimentary sequences in the Gulf of Lion: A record of 100,000 years climatic cycles ArchiMer
Rabineau, Marina; Berne, Serge; Aslanian, Daniel; Olivet, Jean-louis; Joseph, Philippe; Guillocheau, François; Bourillet, Jean-francois; Le Drezen, Eliane; Granjeon, Didier.
The wide continental shelf of the Gulf of Lion (up to 70 km) has been the object of numerous investigations since the early days of oceanography. Yet, the question of sequences duration, the mechanisms of deposition and factors implied remained unanswered. A study of a very dense grid of Very High Resolution (VHR) seismic reflection (Sparker) data associated with surficial cores both, collected by IFREMER between 1992 and 2001 on the outer shelf and upper slope offshore of Sète in the Languedoc region gives a new insight into these issues. Analysis of the 3D geometry of the sedimentary record reveals a basic depositional pattern consisting of a pair of horizontally juxtaposed and downlapping prisms. Prism PI with low angle clinoforms (<1°) lies on the...
Tipo: Text Palavras-chave: Stratigraphic modelling; Cores; High resolution seismic data; Glacioeustatism; Climatic cycles; Gulf of Lion; Western Mediterranean.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-368.pdf
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Seismic Exploration of the Deep Structure and Seismogenic Faults in the Ligurian Sea by Joint Multi Channel and Ocean Bottom Seismic Acquisitions: Preliminary Results of the SEFASILS Cruise ArchiMer
Dessa, Jean-xavier; Beslier, Marie-odile; Schenini, Laure; Chamot-rooke, Nicolas; Corradi, Nicolà; Delescluse, Matthias; Déverchère, Jacques; Larroque, Christophe; Sambolian, Serge; Canva, Albane; Operto, Stéphane; Ribodetti, Alessandra; Agurto-detzel, Hans; Bulois, Cédric; Chalumeau, Caroline; Combe, Laure.
The north Ligurian margin is a complex geological area in many ways. It has witnessed several phases of highly contrasting deformation styles, at both crustal scale and that of shallower cover tectonics, simultaneously or in quick succession, and with significant spatial variability. This complex interplay is mirrored in the resulting intricate structures that make it hard to identify active faults responsible for both, the significant seismicity observed, and the tectonic inversion undergone by the margin, identified at longer time scales on morphostructural grounds. We present here the first preliminary results of the leg 1 of SEFASILS cruise, conducted in 2018 offshore Monaco, in an effort to answer these questions by means of modern deep seismic...
Tipo: Text Palavras-chave: Western Mediterranean; Ligurian basin; Tectonic inversion; Salt tectonics; Crustal geophysical exploration; Multichannel seismic imaging; Wide-angle seismic recording.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00615/72690/71694.pdf
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Shoreface migrations at the shelf edge and sea-level changes around the Last Glacial Maximum (Gulf of Lions, NW Mediterranean) ArchiMer
Jouet, Gwenael; Berne, Serge; Rabineau, Marina; Bassetti, Maria-angela; Bernier, P.; Dennielou, Bernard; Sierro, F.j.; Flores, J.a.; Taviani, M..
The Bourcart–Hérault canyon interfluve in the Gulf of Lions (NW Mediterranean) was the site of very high sedimentation (up to 2.5 m/kyr) around the Last Glacial Maximum, due to the vicinity of major fluvial systems that fed the shelf edge. Shoreface deposits and offshore muds deposited during each glacial/interglacial 100 kyr-cycle, created a repeated motif with high-angle and low-angle clinoforms on seismic profiles. New detailed morphological, sedimentological and paleo-environmental data, constrained by 14C dating, allow us to propose a scenario for the evolution of this critical area between 46 and 15 cal. kyr BP. The major seismic sequence (S5), formed as a forced regression during the overall sea-level fall between MIS-3 and MIS-2, can be sub-divided...
Tipo: Text Palavras-chave: Heinrich events; Western Mediterranean; High resolution sedimentary record; Relative sea level; Last Glacial Maximum.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2328.pdf
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Short-term prey field lability constrains individual specialisation in resource selection and foraging site fidelity in a marine predator ArchiMer
Courbin, Nicolas; Besnard, Aurelien; Peron, Clara; Saraux, Claire; Fort, Jerome; Perret, Samuel; Tornos, Jeremy; Gremillet, David.
Spatio-temporally stable prey distributions coupled with individual foraging site fidelity are predicted to favour individual resource specialisation. Conversely, predators coping with dynamic prey distributions should diversify their individual diet and/or shift foraging areas to increase net intake. We studied individual specialisation in Scopoli’s shearwaters (Calonectris diomedea) from the highly dynamic Western Mediterranean, using daily prey distributions together with resource selection, site fidelity and trophic-level analyses. As hypothesised, we found dietary diversification, low foraging site fidelity and almost no individual specialisation in resource selection. Crucially, shearwaters switched daily foraging tactics, selecting areas with...
Tipo: Text Palavras-chave: Behavioural consistency; Calonectris diomedea; Foraging site fidelity; Resource selection; Scopoli's shearwater; Temporal resource dynamic; Western Mediterranean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00437/54859/56479.pdf
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