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See detailDiel activity of Sarpa salpa (Sparidae) by ultrasonic telemetry in a Posidonia oceanica meadow of Corsica (Mediterranean Sea)
Jadot, Catherine; Ovidio, Michaël ULg; Voss, Jacques ULg

in Aquatic Living Resources (2002), 15(6), 343-350

In the Mediterranean Sea, the fish Sarpa salpa (Sparidae) is the only vertebrate grazer of Posidonia oceanica meadows. In order to gain knowledge about the behaviour of S. salpa and a better understanding ... [more ▼]

In the Mediterranean Sea, the fish Sarpa salpa (Sparidae) is the only vertebrate grazer of Posidonia oceanica meadows. In order to gain knowledge about the behaviour of S. salpa and a better understanding of the meadow's primary production recycling, an original study was designed using ultrasonic telemetry to investigate activity patterns and space utilisation in the field. During June-September 2000, we compared diel movements of, six adult S. salpa (249-317 nim FL and 313-633 g) in the Bay of Calvi. These fish were tagged by intraperitoneal insertion of ultrasonic transmitters. Their positions were recorded with a directional hydrophone from a small boat with an accuracy between 10 and 50 m, depending on the local environment. The tracking duration ranged from 3 to 22 days (average 11.8 +/- 7.3). Locations were performed from at least dawn to dusk or early night, and one fish was tracked during the entire 24-h cycle. Fish were more mobile during the twilight periods, but statistical analysis indicated individual differences for the precise period of mobility. Two major behavioural patterns were observed: first, the fish remained in close vicinity of the harbour during the day and moved away to the north or the south at dusk to access nocturnal sites, occupying a home range of about 4.3 ha. The second behavioural pattern involved persistent occupation of the same sites during day and night within a relatively restricted home range (about 0.8 ha). Great variation in mobility was found and the same individual fish could show both kinds of behaviour. (C) 2002 Ifremer/CNRS/Inra/IRD/Cemagref/Editions scientifiques et medicales Elsevier SAS. All rights reserved. [less ▲]

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See detailDiel carbon and oxygen budgets in the Posidonia oceanica bed of Calvi Bay.
Dauby, Patrick ULg; Soullard, Mady; Frankignoulle, Michel et al

Conference (1992, February)

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See detailDielectric and rheological characterization of polymer/graphene oxide nano composites
Thomassin, Jean-Michel ULg; Trifkovic, Milana; Jérôme, Christine ULg et al

Conference (2013, April 05)

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See detailDielectric Multilayer Films Fabricated by Magnetron Sputtering: How Far Can the Iridescence Be Tuned?
Deparis, Olivier; Rassart, Marie; Vandenbem, Cedric et al

in Plasma Processes and Polymers (2009), 6

Periodic dielectric multilayer structures can generate interferential colours from optically transparent basic materials. Their iridescence property, i.e. the change of colour with the illumination or ... [more ▼]

Periodic dielectric multilayer structures can generate interferential colours from optically transparent basic materials. Their iridescence property, i.e. the change of colour with the illumination or viewing angle, is exploited in the industry to produce structurally coloured coatings and paints. Magnetron sputtering is an efficient technique for producing multilayer films owing to its ability to deposit films on large surfaces with excellent uniformity and reproducibility in both the film thickness and composition. Based on a theoretical model of the optical response, we investigated the iridescence tuning range of the technologically important SiO2/TiO2 material system. Radically different iridescent behaviours were predicted theoretically and demonstrated experimentally by selecting appropriate combinations of period and layer thickness ratio. [less ▲]

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See detailDielectric properties of a model cationic ionomer
Yano, S.; Tadano, K.; Jérôme, Robert ULg

in Macromolecules (1991), 24(24), 6439-6442

An alpha,omega-bis(dimethylamino)polyisoprene (M(n)BAR = 5000) has been quaternized by alpha,alpha'-dibromo-p-xylene with formation of a model cationic ionomer. Dielectric spectroscopy has shown an alpha ... [more ▼]

An alpha,omega-bis(dimethylamino)polyisoprene (M(n)BAR = 5000) has been quaternized by alpha,alpha'-dibromo-p-xylene with formation of a model cationic ionomer. Dielectric spectroscopy has shown an alpha-relaxation which corresponds to the micro-Brownian motion of chain segments directly attached to the quaternary ammonium dipoles. A shoulder on the low-temperature side of the alpha-relaxation has been assigned to the contribution of the polymer segments, the mobility of which is not restricted by the multiplets. That situation is in full agreement with the multiplet-cluster concept recently revisited by Eisenberg et al. [less ▲]

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See detailDielectronic structure of 2l-1s Transitions of Multicharged Ions of Argon with nuclear charges Z = 10 - 17
Biémont, Emile ULg; Quinet, Pascal ULg; Faenov, A.Ya et al

in Physica Scripta (2000), 61

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See detailDielectrophoresis Simulation for MEMS Applications: Comparison of the different numerical approaches
Rochus, Véronique ULg; Rixen, Daniel

in 9th US Natinal Congress on Computational Mechanics (2007)

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See detailDiem Werner, Ein arabisches Rechtsgutachten zum Eherecht aus dem 11.-12. Jahrhundert aus der Heidelberger Papyrussammlung.
Bauden, Frédéric ULg

in Bulletin Critique des Annales Islamologiques (2009), 25

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See detailDIEM Werner, Eine arabische Kaufurkunde von 1024 n. Chr. aus Ägypten
Bauden, Frédéric ULg

in Bulletin Critique des Annales Islamologiques (2006), 22

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See detail"Dies verhüllte Genießen der Musik ohne Töne" : Robert Schumanns Reflexionen über das Medium Schrift.
Viehöver, Vera ULg

in Herwig, Henriette; Kalisch, Volker; Kortländer, Bernd (Eds.) et al ^Übergänge : Zwischen Künsten und Kulturen : Akten des Kongresses zum 150. Todestag von Heinrich Heine und Robert Schumann (2006)

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See detailDiesel and Gasoline for HCCI Combustion
Machrafi, Hatim ULg

in Acosta, M. J. (Ed.) Advances in Energy Research (2010)

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See detailDiet analysis of Leopoldamys neilli, a cave-dwelling rodent in Southeast Asia, using Next-Generation Sequencing from feces
Latinne, Alice ULg; Galan, Maxime; Waengsothorn, Surachit et al

in Journal of Cave and Karst Studies (2014), 76(2), 139-145

Leopoldamys neilli is a Murinae rodent endemic to limestone karst of Thailand and the Lao PDR, but its ecology and the reasons of its endemism to karst are still totally unknown. The aim of this pilot ... [more ▼]

Leopoldamys neilli is a Murinae rodent endemic to limestone karst of Thailand and the Lao PDR, but its ecology and the reasons of its endemism to karst are still totally unknown. The aim of this pilot study was to examine the plant composition of the diet of L. neilli at the level of order and family using DNA for molecular identification and to compare it with two other forest-dwelling Leopoldamys species, L. herberti and L. sabanus. A 202bp fragment of the rbcL gene was amplified and sequenced for twenty-three fecal samples of the three species using 454 pyrosequencing. We successfully identified a total of seventeen orders and twenty-one plant families, corresponding to thirty-three putative species, in the feces of these three Leopoldamys species. Solanaceae were the most common plants in the diet of L.neilli regardless of the region and sampling season, and they were also present in feces of both L. herberti and L. sabanus. The Araceae, Fabaceae, and Apocynaceae families were also identified in feces of L. neilli collected in various regions of Thailand and at different seasons. Plants of the Oleaceae family are consumed by both L. herberti and L. sabanus but were not found in the diet of L. neilli. Further improvements of the study, such as the use of additional genes, the creation of a reference collection, the microhistological examination of plant fragments to determine which parts of the plant are consumed, and the analysis of the animal diet of Leopoldamys are suggested to enhance the quality and accuracy of the results obtained. [less ▲]

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See detailDiet and food preference of the waterbuck (Kobus ellipsiprymnus defassa) in the Pendjari National Park, Benin
Kassa, Barthélemy; Libois, Roland ULg; Sinsin, Brice

in African Journal of Ecology (2008), 46(3), 303-310

This study investigated composition and selectivity in diet for waterbuck in the Pendjari National Park in northwestern Benin, through the use of micrographic analysis of faecal samples. Three plant ... [more ▼]

This study investigated composition and selectivity in diet for waterbuck in the Pendjari National Park in northwestern Benin, through the use of micrographic analysis of faecal samples. Three plant species (Panicum anabaptistum, Echinochloa stagnina and Andropogon gayanus) were regularly consumed all year round. Meanwhile, three other species (i.e., Hyparrhenia involucrata, Acroceras amplectens and Oryza barthii) are mostly found in its diet during the beginning of the rainy season. During the dry season, long life grasses (>40%) and tree forage (about 35%) were the most dominant life form in the diet. On the contrary at the beginning of the rainy season, annual species (> 50%) were dominant. In conclusion, the waterbuck has a grazer regime when plant species are abundant and a mixed diet during the dry season. Waterbuck’s food niche breath, defined by Hespenheide [Ecology and Evolution of communities. Harvard Univ. Press, 1975], was lower than 1, implying this antelope does not eat all food categories in a proportional way. Shannon diversity index showed that the diet was more diversified during the rainy season and less diversified at the end of the dry season. Based on [Ecology, 64 (1983), 1297] diet selectivity index, waterbuck exerted a positive selection on the major graminaceous species. [less ▲]

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See detailDiet and foraging ecology of Roseate terns and lesser noddies breeding sympatrically on Aride Island, Seychelles
Monticelli, David; Ramos, J. A.; Tavares, P. C. et al

in Waterbirds (2008), 31(239), 248

Inferences on seabird ecology from stable isotopes ratios (δ13C, δ15N) and mercury concentrations analysis of feathers have been made for temperate and polar species but are far more rare for tropical ... [more ▼]

Inferences on seabird ecology from stable isotopes ratios (δ13C, δ15N) and mercury concentrations analysis of feathers have been made for temperate and polar species but are far more rare for tropical species. In this paper, we used this approach combined with analysis of regurgitations and feeding observations at colonies to examine diet segregation between Roseate Terns (Sterna dougallii) and Lesser Noddies (Anous tenuirostris) breeding sympatrically on Aride Island (Seychelles), western Indian Ocean. Our results indicated extensive overlap between the two species in trophic level and foraging area during the breeding season. Goatfish predominated (93-97%) in all diet samples of adults and chicks collected in the colonies, except in prey fed to mates by Roseate Terns, of which scad and tuna comprised 20%. The isotopic analyses of feathers replaced by adults during molt (primary and body feathers) suggested, however, that the two species differ in foraging ecology during the nonbreeding period. Roseate Tern adults had consistently lower δ15N values than Lesser Noddies which, in turn, had δ15N values comparable to those of chick feathers grown on Aride. Moreover, low but similar mercury levels were found in body feathers of Lesser Noddy adults and Roseate Tern chicks, whereas Roseate Tern adults were significantly more contaminated. Overall, these results support the hypothesis that the Lesser Noddy is largely sedentary, being associated with the same food web in the vicinity of the colonies year-round. In contrast, Roseate Terns rely on distinct prey during the molting (nonbreeding) season which may be also consistent with a change in food web (i.e., a migratory regime) although the assignment of potential wintering areas remain difficult without isotopic basemaps currently available for the Indian Ocean. [less ▲]

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See detailDiet and gut microorganisms of Munidopsis squat lobsters associated with natural woods and mesh-enclosed substrates in the deep South Pacific
Hoyoux, Caroline; Zbinden, M.; Samadi, S. et al

in Marine Biology Research (2012), 8(1), 28-47

Squat lobsters of the deep-sea genus Munidopsis are among the most regularly reported crustaceans associated with deep-sea wood falls. They are often thought to indirectly use these substrates for preying ... [more ▼]

Squat lobsters of the deep-sea genus Munidopsis are among the most regularly reported crustaceans associated with deep-sea wood falls. They are often thought to indirectly use these substrates for preying or scavenging wood-associated molluscs or annelids, albeit the species M. andamanica has been recently highlighted as a xylophagous specialist. In this work, we examined the feeding appendages, gut contents and gut lining of M. nitida, M. bispinoculata and M. pilosa specimens from natural sunken woods and compared them with specimens of the same species having survived and grown on different hard-to-digest substrates (i.e. woods, turtle shells and whale bones) experimentally submerged in the deep South Pacific. In both cases, all three species directly ingest large wood fragments deeply degraded by microorganisms, but M. nitida also feeds on experimentally submerged whale bone and turtle shell fragments. Munidopsis nitida is also the only species to host a resident gut microflora, but the bacterial morphotypes vary according to the ingested substrate. The results suggest that the three species are most probably opportunistic, bacterivorous detritivores and that M. nitida could be at the beginning of an evolutionary process towards xylophagy within the genus Munidopsis. © 2012 Copyright Taylor and Francis Group, LLC. [less ▲]

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See detailDiet composition of young and adult Northern Grey-headed Sparrow Passer griseus and adult Southern Red Bishop Euplectes orix in Burundi
Nasasagare, Régine Pacis; Ntakimazi, Gaspard; Libois, Roland ULg

in Malimbus (2013), 35(1), 1-10

We studied the diet composition of Northern Grey-headed Sparrow Passer griseus and Southern Red Bishop Euplectes orix in four localities of the Rusizi Plain, northwest Burundi. We analyzed crop contents ... [more ▼]

We studied the diet composition of Northern Grey-headed Sparrow Passer griseus and Southern Red Bishop Euplectes orix in four localities of the Rusizi Plain, northwest Burundi. We analyzed crop contents of 100 adults from each of the two species and the composition of food brought by parents to nestlings of the sparrow at ten nests. In all four sites, the sparrow’s diet consisted primarily of rice. The bishop also fed mostly on rice grains but also ate Lepidoptera caterpillars, some other insects and wild grass seeds such as Panicum sp. and Brachiaria sp. For adults of both bird species, there was no significant variation in diet throughout the year. However, the diet of young sparrows was much more diverse and changed from the day of hatching until fledging. On the day of hatching, chicks ate mainly caterpillars but by the tenth day, food items comprised one third caterpillars, one third Orthoptera and the rest of other insects including Odonata, Dictyoptera, Isoptera and adult Lepidoptera. After this and until fledging, the chicks were fed increasingly on rice seeds. Simultaneously, the proportion of caterpillars taken gradually decreased until none was fed to the nestlings at the end of the nestling period. The items brought by parents also varied with time of day, with caterpillars and grasshoppers in higher proportions in the morning, decreasing around mid-day and then increasing in the evening. [less ▲]

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See detailDiet effects on bumblebee health
Roger, N.; Michez, D.; Wattiez, R. et al

in Journal of Insect Physiology (2017), 96

Among physiological processes, the maintenance of immunity is one of the most energetically costly in invertebrates. Disease resistance can be quantified by measuring immunocompetence, which is defined as ... [more ▼]

Among physiological processes, the maintenance of immunity is one of the most energetically costly in invertebrates. Disease resistance can be quantified by measuring immunocompetence, which is defined as the ability of an organism to mount an immune response, either in cellular, humoral or behavioural forms. In insects, immune capacity can be affected by a variety of factors including pesticides, genetic diversity or diet. Here we focus on an important species of domesticated pollinator, Bombus terrestris, and the potential impact of a poor pollen diet (low nutritional content and toxic) on its health. We investigate three responses at both colony and individual levels: behavioural, humoral and cellular. Our results show that poor pollen diets decrease larval and pupal masses and increase larval ejection as well as adult constitutive immunity (i.e., prophenoloxidase assays). The susceptibility of bumblebees to disease and infection might therefore be greater after a nutritive stress. These findings raise the importance of available plant hosts, especially floral plant species providing pollen with suitable nutritive quality (i.e., nutrient pollen content) for bumblebees. © 2016 Elsevier Ltd [less ▲]

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