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Статті в журналах з теми "Contenuti stomacali"
Dodelin, Benoît, Benjamin Pene, and Jean André. "L'alimentation des coléoptères saproxyliques et notes sur les contenus stomacaux de cinq espèces." Bulletin mensuel de la Société linnéenne de Lyon 74, no. 10 (2005): 335–45. http://dx.doi.org/10.3406/linly.2005.13614.
Повний текст джерелаMurano, Masaaki, and John Mauchline. "DEEP-SEA MYSIDS FROM THE NORTH ATLANTIC OCEAN WITH DESCRIPTION OF FOUR NEW SPECIES." Crustaceana 72, no. 3 (1999): 273–95. http://dx.doi.org/10.1163/156854099503366.
Повний текст джерелаLoera-Padilla, Francisco Javier, Iván Díaz-Pacheco, Joaquín Arroyo-Cabrales, Edmundo Carlos López-Barbosa, Livia Socorro León Paniagua, and Carlos Armando Tena-Morelos. "HÁBITOS ALIMENTICIOS DEL MURCIÉLAGO MICROENDÉMICO Rhogeessa mira Laval, 1973 (CHIROPTERA: VESPERTILIONIDAE), MICHOACÁN, MÉXICO." Revista Mexicana de Mastozoología (Nueva Epoca) 1, no. 1 (December 14, 2017): 35. http://dx.doi.org/10.22201/ie.20074484e.2017.1.1.240.
Повний текст джерелаLedoyer, M. "Mysidacés (Crustacea) de Kerguelen, Crozet et Bouvet (Océan Austral) récoltés par la Japonaise, le Marion-Dufresne (1972–82) et dans des contenus stomacaux d'oiseaux." Journal of Natural History 29, no. 3 (June 1995): 601–18. http://dx.doi.org/10.1080/00222939500770211.
Повний текст джерелаPeretti, Danielle, and Izabel de Fátima Andrian. "Feeding of Eigenmannia trilineata (Pisces, Sternopygidae) (Lopez & Castello, 1966), in the upper Paraná River floodplain, Brazil." Brazilian Archives of Biology and Technology 42, no. 1 (1999). http://dx.doi.org/10.1590/s1516-89131999000100011.
Повний текст джерелаFurfaro, Giulia, Marcella D’Elia, Stefania Mariano, Egidio Trainito, Michele Solca, Stefano Piraino, and Genuario Belmonte. "SEM/EDX analysis of stomach contents of a sea slug snacking on a polluted seafloor reveal microplastics as a component of its diet." Scientific Reports 12, no. 1 (June 17, 2022). http://dx.doi.org/10.1038/s41598-022-14299-3.
Повний текст джерелаДисертації з теми "Contenuti stomacali"
Minocci, Marco. "Studio dell'alimentazione di Mytilus Galloprovincialis (Lamark, 1819) e del suo impatto sull'ecosistema pelagico del golfo di Trieste." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4565.
Повний текст джерелаScopo della ricerca è stata la stima dell’alimentazione di Mytilus galloprovincialis (Lamarck, 1819) in termini quali-quantitativi, al fine di valutare l’impatto delle mitilicolture sull'ecosistema pelagico del Golfo di Trieste nell’ambito del progetto SosteMiTs (Sostenibilità della Mitilicoltura Triestina). L’alimentazione dei mitili è stata studiata mediante l’analisi dei contenuti stomacali al fine di individuare le prede preferenziali del mitilo. Tali analisi sono state integrate da informazioni sulle abbondanze dei diversi gruppi planctonici in colonna d’acqua per definire l’eventuale selettività e le preferenze trofiche nelle diverse stagioni e da analisi qualitativa sulle feci prodotte in laboratorio per la stima degli organismi digeriti dal mitilo. Il lavoro è stato effettuato sia tramite raccolta di dati in campo che con prove sperimentali di laboratorio. Tutte le analisi sono state eseguite presso il Dipartimento di Oceanografia Biologica (BIO) dell’ OGS di Trieste. L’analisi dei campioni d’acqua ha sottolineato il significativo impatto dei mitili sul popolamento planctonico sia in termini di abbondanza che di biomassa. La dieta dei molluschi è risultata molto varia, comprendendo un ampio spettro di prede sia dal punto di vista qualitativo (111 taxa) che dimensionale (tra circa 4.7 µm e 700 µm). La maggior parte degli organismi osservati nei contenuti stomacali è risultata appartenere alla componente autotrofa del popolamento planctonico ma è stata evidenziata l’importanza della componente eterotrofa micro- e mesozooplanctonica. I risultati delle analisi dei contenuti stomacali comparati alla disponibilità nell’ambiente naturale hanno evidenziato una selezione positiva nei confronti di alcune specie di diatomee, di dinoficee e di altri gruppi di protozoi ed una negativa per altre diatomee come Chaetoceros e Bacteriastrum (coloniali e provviste di setae) e di un unico dinoflagellato (Ceratium). Gli esperimenti condotti in laboratorio hanno permesso di stimare il volume filtrato dal mitilo, valori compresi tra 0.8 e 5 L/h, che è risultato correlato essenzialmente con la densità della preda offerta.
XXIII Ciclo
1976
Bertrand, Micheline. "Faune parasitaire, morphologie et contenus stomacaux comme indicateurs des habitats utilisés par l'omble de fontaine, salvelinus fontinalis /." Trois-Rivières : Université du Québec à Trois-Rivières, 2004. http://www.uqtr.ca/biblio/notice/tablemat/18184093TM.pdf.
Повний текст джерелаUne partie du mémoire est rédigée sous forme d'article scientifique. Bibliogr.: f. 86-96. Également disponible en format microfiche et PDF.
Bertrand, Micheline. "Faune parasitaire, morphologie et contenus stomacaux comme indicateurs des habitats utilisés par l'omble de fontaine, salvelinus fontinalis." Thèse, Université du Québec à Trois-Rivières, 2004. http://depot-e.uqtr.ca/4662/1/000109662.pdf.
Повний текст джерелаMahfouz, Céline. "An assessment of the chemical contamination and the diet changes of the harbou porpoise (Phocoena phocoena) stranded along the southern North Sea." Thesis, Littoral, 2014. http://www.theses.fr/2014DUNK0433/document.
Повний текст джерелаThe North Sea is heavely impacted by human activities such as overfishing and pollution. Due to their position as top predators in the ocean, marine mammals are becoming increasingly affected by anthropogenic activities. The large-scale surveys SCANS in 1994 and SCANS II in 2005 that were held in the North Sea to estimate the abundance of small cetaceans highlighted a major shift in the distribution of harbour porpoises (Phocoena phocoena) from the northern parts of the North Sea to its eastern parts. Alongside, over the past few decades harbour porpoises stranding has increased in the southern North Sea particularly along the French and Belgian coastal waters. Since the contaminant exposure presents, among others, a potential threat to harbour porpoises inhabiting the North Sea, the first objective of the present study was to assess the contamination status of this species in the southern North Sea. On the other hand, the distribution and abundance of marine mammals is expected to follow the distribution of their main prey species. Hence, the second objective of this study was to investigate whether the changes in the distribution of porpoises in the southern North Sea may be a result of the changes in prey availability. Moreover, the third objective was to evaluate the interest of combining three methods to investigate the diet of harbour porpoises : stomach contents, stable isotopes (carbon and nitrogen) and fatty acids analyses. First, the contamination status was evaluated through the determination of two components of chemical contaminants (metals and persistent organic pollutants) in tissues of harbour porpoises stranded along the southern North Sea between 2006 to 2013. Several chemical contaminants presented higher concentrations in diseased animals compared to healthy animals. In addition, some metallic contaminants showed bioaccumulation with age. Comparison with previous study suggests that the population status of harbor porpoises in term of chemical concentration has been stable from 1994 to 2013. This work suggested that the increase in the number of stranded individuals is not related to the decline in the quality of the environment. Secondly, the shift in the abundance of harbour porpoises was evaluated and interpreted in the light of prey species abundance. Three techniques were used in order to determine the diet of porpoises. Results highlighted the presence of gobies, whiting, sandeel, sprat, trisopterus sp., herring and sardine as potential preys. The shift of the abundance of porpoises form the northern parts of the North Sea to its southern parts was attributed to the sandeel abundance decline in the northern parts of the North Sea along with the re-invasion of the southern North Sea by the sardine species, probably in response to climate change. Finally, the value of a multi-approach dietary analysis was evaluated. Besides overcoming the limitations of each method, combining different techniques that integrate diet over days and weeks allowed gaining more complete understanding of harbour porpoise's diet
Trystram, Clément. "Écologie trophique de poissons prédateurs et contribution à l'étude des réseaux trophiques marins aux abords de La Réunion." Thesis, La Réunion, 2016. http://www.theses.fr/2016LARE0032/document.
Повний текст джерелаThe general aim of this Ph.D thesis is to analyse the feeding relationship between the different predators of multiple habitats. Carried out between January 2012 and December 2014 in collaboration with the fishing stakeholders, the sampling focused on species of commercial interest or interacting with fisheries (bycatches and depredators). Carbon (δ13C) and nitrogen (δ15N) stable isotopes ratio and stomacal content analysis were used to determine the organic matter they depend on, their interspecific relationships and the factors influencing their diets. Results show a wide disparity between species caught in shallow water and the deep ones. Despite their association with the benthic environment, deepwater species (100-600m) indirectly rely on surface primary production through their vertically migrating prey. This dependence on mesopelagic organism induce consequently a high dietary overlap between pairwise species, although alleviated by their presence in different bathymetric areas. Shallow species are split into three distinct diet categories along a shore-offshore gradient. Tiger shark are likely to form an homogeneous population composed with generalist individuals conversely to bull sharks which are forming an assorted population of individuals specialized on different resources. Those results tend to promote an habitat-focused approach, more suitable for the management of deepwater species, whereas a species-focused approach would rather be more effective for shallow, highly mobile species
Pasquaud, Stéphanie. "Les relations trophiques : éléments de structuration des peuplements ichtyologiques en milieu estuarien : application à l'estuaire de la Gironde." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13214.
Повний текст джерелаThis work evaluates the role of the trophic relationships in fish assemblages as a structuring factor in an estuarine ecosystem. Thus, the trophic relationships of the 14 main fish species of the Gironde estuary are described in relation with space, time, size class, via the stomach content analysis. This approach highlighted the high diversity of specific feeding behaviours and, excepted for the mullet, a predominance of the temporal component in feeding variability. Stable isotopic analysis (carbon and nitrogen) was used to evaluate their investigative contributions to the understanding of the structure and the functioning of the estuarine trophic relationships. This work shows that this tool is not able to determine precisely the trophic levels and the relationships between a fish and its preys in such ecosystems. Thus, it can not replace the traditional method of stomach content analysis. In addition, in order to describe trophic seasonal structures, to suggest hypothesis and to identify component keys of preys, the trophic guilds were built from the temporal analysis. The variability of the fish assemblages is well structured by the seasonal dynamics of the prey communities. This observation suggests a "e;bottom-up"e; control of the trophic web. We finally propose a new tool enabling the description of the fish structure and the functioning of the trophic webs through accurate trophic guilds. These trophic guilds should be utilised in other transitional water ecosystems
Espinoza, Pepe. "Trophic dynamics in the northern Humboldt Current system : insights from stable isotopes and stomach content analyses." Thesis, Brest, 2014. http://www.theses.fr/2014BRES0066/document.
Повний текст джерелаThe northern Humboldt Current system (NHCS) off Peru is one of the most productive world marine regions. It represents less than 0.1% of the world ocean surface but presently sustains about 10% of the world fish catch, with the Peruvian anchovy or anchoveta Engraulis ringens as emblematic fish resource. Compared with other eastern boundary upwelling systems, the higher fish productivity of the NHCS cannot be explained by a corresponding higher primary productivity. On another hand, the NHCS is the region where El Niño, and climate variability in general, is most notable. Also, surface oxygenated waters overlie an intense and extremely shallow Oxygen Minimum Zone (OMZ). In this context, the main objective of this study is to better understand the trophic flows in the NHCS using both stomach content and stable isotope analyses. The study focuses on a variety of organisms from low trophic levels such as zooplankton to top predators (seabirds and fur seals). The approach combines both long-term and specific studies on emblematic species such as anchoveta, and sardine Sardinops sagax and a more inclusive analysis considering the 'global' food web in the recent years (2008 –2012) using stable isotope analysis.Revisiting anchovy and sardine we show that whereas phytoplankton largely dominated anchoveta and sardine diets in terms of numerical abundance, the carbon content of prey items indicated that zooplankton was by far the most important dietary component. Indeed for anchovy euphausiids contributed 67.5% of dietary carbon, followed by copepods (26.3%).Selecting the largest prey, the euphausiids, provide an energetic advantage for anchoveta in its ecosystem where oxygen depletion imposes strong metabolic constrain to pelagic fish. Sardine feed on smaller zooplankton than do anchoveta, with sardine diet consisting of smaller copepods and fewer euphausiids than anchoveta diet. Hence, trophic competition between sardine and anchovy in the northern Humboldt Current system is minimized by their partitioning of the zooplankton food resource based on prey size, as has been reported in other systems.These results suggest an ecological role for pelagic fish that challenges previous understanding of their position in the foodweb (zooplanktophagous instead of phytophagous), the functioning and the trophic models of the NHCS.Finally to obtain a more comprehensive vision of the relative trophic position of NHCS main components we used stable isotope analyses. For that purpose we analyzed the δ13C and δ15N stable isotope values of thirteen taxonomic categories collected off Peru from 2008 - 2011, i.e., zooplankton, fish, squids and air-breathing top predators. The δ15N isotope signature was strongly impacted by the species, the body length and the latitude. Along the Peruvian coast, the OMZ get more intense and shallow south of ~7.5ºS impacting the baseline nitrogen stable isotopes. Employing a linear mixed-effects modelling approach taking into account the latitudinal and body length effects, we provide a new vision of the relative trophic position of key ecosystem components. Also we confirm stomach content-based results on anchoveta Engraulis ringens and highlight the potential remarkable importance of an often neglected ecosystem component, the squat lobster Pleuroncodes monodon. Indeed, our results support the hypothesis according to which this species forage to some extent on fish eggs and larvae and can thus predate on the first life stages of exploited species. However, the δ13C values of these two species suggest that anchoveta and squat lobster do not exactly share the same habitat. This would potentially reduce some direct competition and/or predation
Книги з теми "Contenuti stomacali"
Groppali, Riccardo. Uccelli predatori di insetti: Indagine e considerazioni su circa 21,000 insetti e 1,000 invertebrati contenuti in 1,521 stomaci di 204 specie italiane. Bologna: Oasi Alberto Perdisa, 2007.
Знайти повний текст джерелаGroppali, Riccardo. Uccelli predatori di insetti: Indagine e considerazioni su circa 21,000 insetti e 1,000 invertebrati contenuti in 1,521 stomaci di 204 specie italiane. Bologna: Oasi Alberto Perdisa, 2007.
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