Готові списки джерел за темами / Sentinels species

Добірка наукової літератури з теми "Sentinels species"

Автор: Grafiati

Опубліковано: 14 вересня 2021

Оновлено: 1 лютого 2022

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Sentinels species".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Sentinels species":

RAGUSA-NETTO, J. "Sentinels in Saltator atricollis (Passeriformes: Emberizidae)." Revista Brasileira de Biologia 61, no. 2 (May 2001): 317–22. http://dx.doi.org/10.1590/s0034-71082001000200015.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests that the ability of sentinels to detect predators may play a central role as an anti-predator device.

RAGUSA-NETTO, J. "Raptors and "campo-cerrado" bird mixed flock led by Cypsnagra Hirundinacea (Emberizidae:Thraupinae)." Revista Brasileira de Biologia 60, no. 3 (August 2000): 461–67. http://dx.doi.org/10.1590/s0034-71082000000300011.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Bird mixed flocks including Cypsnagra hirundinacea and Neothraupis fasciata as species with sentinels were studied in "campo-cerrado" in order to investigate the possible relationship between alertness and the mixed flock leadership. This study was conducted from March to September 1996 and mixed flocks were observed on average for 2:30h. The time with sentinels were recorded for C. hirundinacea and N. fasciata. The sentinels of Cypsnagra hirundinacea performed most of the vigilance (time with sentinel was on average 42 ± 17%, 41 ± 17% of which by C. hirundinacea, whereas only 1.2 % by N. fasciata) and gave all the alarm calls recorded (54% of the encounters with raptors stimulated alarm calls). A relationship was verified between time with sentinel and the rate of encounters with raptor (ANOVA, F = 3.0, P < 0.05). The results of this study are an evidence for the anti-predatory function of mixed flocks, in campo-cerrado, and the alertness as a major feature of a leader species, since C. hirundinacea always led those flocks.

Casey, Kerriann M., Amanda L. Johnson, Melea N. Hunrath, Jenelle K. Fraser, Nicole C. McCowan, Katherine Wasson, Rosalinda A. Doty, Stephen M. Griffey, and Denise M. Imai. "Proliferative Typhlocolitis With Multinucleated Giant Cells: A Nonspecific Enteropathy in Immunodeficient Sentinel Mice." Veterinary Pathology 56, no. 1 (September 16, 2018): 157–68. http://dx.doi.org/10.1177/0300985818798106.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Beginning in 2015, athymic nude sentinel mice from conventional, medium-, and high-security facilities presented to the Comparative Pathology Laboratory (CPL) with weight loss, diarrhea, and/or rectal prolapse. Regardless of whether clinical signs were present or absent, the gross observation of ceco-colonic thickening corresponded histologically to pleocellular typhlocolitis with mucosal hyperplasia and lamina proprial multinucleated cells. A subset of affected sentinels exhibited granulomatous serositis and hepatosplenic necrosis with multinucleated cells. Initial suspicion of mouse hepatitis virus infection was excluded by polymerase chain reaction, electron microscopy, and serology. Multinucleated giant cells were confirmed as macrophages by positive immunoreactivity to Mac-3 and Iba-1 and negative immunoreactivity to pancytokeratin. From conventional and medium-security facilities, Helicobacter species were identified in 40 of 143 (27.9%) mice, with H. hepaticus accounting for 72.5% of identified Helicobacter species. Other agents included opportunistic bacterial infection (41/145, 28.3%), murine norovirus (16/106, 15.1%), and pinworms (2/146, 1.4%). From high-security facilities, only Enterobacter cloacae was identified (2/13, 15.4%), and no evidence of Helicobacter sp., murine norovirus, or pinworms was present. No potentially infectious disease agent(s) was identified in 71 of 146 (48.6%) affected nude sentinels from conventional and medium-security facilities and 11 of 13 (84.6%) affected nude sentinels from high-security facilities. No statistically significant differences in histologic lesion scores were identified between Helicobacter-positive and Helicobacter-negative mice. Thus, proliferative typhlocolitis with multinucleated giant cells was considered a nonspecific histologic pattern associated with a variety of primary and opportunistic pathogens in athymic nude mice.

Malanson, George P., Lynn M. Resler, David R. Butler, and Daniel B. Fagre. "Mountain plant communities: Uncertain sentinels?" Progress in Physical Geography: Earth and Environment 43, no. 4 (April 29, 2019): 521–43. http://dx.doi.org/10.1177/0309133319843873.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Mountain plant communities are thought to be sensitive to climate change and, thus, able to reveal its effects sooner than others. The status as sentinels of two plant communities are reviewed. Alpine treeline ecotones and alpine vegetation have been observed to respond to climate change in recent decades. The treeline has moved upslope and alpine communities have had some species increase and others decrease. The response for both, however, has been inconsistent if taken as a whole. Problematic factors for this response are outlined for both: abiotic and biotic interactions partially decouple the plant communities from climate. Differences across spatial and temporal scales complicate interpretation. Partial decoupling leads to nonlinear responses and difficulties for prediction and for planning mitigation.

Bodó, Kornélia, Nicoló Baranzini, Rossana Girardello, Bohdana Kokhanyuk, Péter Németh, Yuya Hayashi, Annalisa Grimaldi, and Péter Engelmann. "Nanomaterials and Annelid Immunity: A Comparative Survey to Reveal the Common Stress and Defense Responses of Two Sentinel Species to Nanomaterials in the Environment." Biology 9, no. 10 (September 23, 2020): 307. http://dx.doi.org/10.3390/biology9100307.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Earthworms and leeches are sentinel animals that represent the annelid phylum within terrestrial and freshwater ecosystems, respectively. One early stress signal in these organisms is related to innate immunity, but how nanomaterials affect it is poorly characterized. In this survey, we compare the latest literature on earthworm and leeches with examples of their molecular/cellular responses to inorganic (silver nanoparticles) and organic (carbon nanotubes) nanomaterials. A special focus is placed on the role of annelid immunocytes in the evolutionarily conserved antioxidant and immune mechanisms and protein corona formation and probable endocytosis pathways involved in nanomaterial uptake. Our summary helps to realize why these environmental sentinels are beneficial to study the potential detrimental effects of nanomaterials.

Peirano, Andrea. "Wrecks on the Bottom: Useful, Ecological Sentinels?" Marine Technology Society Journal 47, no. 3 (May 1, 2013): 118–27. http://dx.doi.org/10.4031/mtsj.47.3.5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

AbstractWrecks play an important role in enhancing marine biodiversity. SCUBA diving video-samplings were performed on eight wrecks, including seven shipwrecks and a sunken airplane, scattered over 180 km along the Ligurian coastline in the northwestern Mediterranean Sea, in water depths of 30‐65 m. Differences in composition of macrobenthic communities were found to be related to the bottom sedimentology and the composition and geometry of the investigated structures. The iron, flat, and even substrata of shipwrecks were dominated by Bivalvia (Ostrea edulis) and Anthozoa (Corynactis viridis), whereas the aluminum, cage-like structure of the airplane was dominated by massive sponges and bryozoans. Furthermore, abundances of some macrobenthic invertebrates were greater on the wrecks than those observed on natural, rocky substrates. Because of the increasing popularity of use of video and photo digital apparatuses among recreational divers, combined with wreck resistance to corrosion, artificial geometries and available surfaces that facilitate species’ settlement and growth, data from wrecks consisting of images and related metadata (depth, date, water temperature, etc.) could provide a new opportunity for monitoring Mediterranean marine biodiversity.

Rabinowitz, Peter M., Matthew L. Scotch, and Lisa A. Conti. "Animals as Sentinels: Using Comparative Medicine To Move Beyond the Laboratory." ILAR Journal 51, no. 3 (January 1, 2010): 262–67. http://dx.doi.org/10.1093/ilar.51.3.262.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Abstract The comparative medicine approach, as applied to the study of laboratory animals for the betterment of human health, has resulted in important medical and scientific progress. Much of what is known about the human health risks of many toxic and infectious hazards present in the environment derives from experimental studies in animals and observational (epidemiological) studies of exposed human populations. Yet there is a third source of “in vivo” knowledge about host-environment interactions that may be underused and -explored: the study of diseases in naturally occurring animal populations that may signal potential human health threats. Just as canaries warned coal miners of the risk of toxic gases, other nonhuman animals, due to their greater susceptibility, environmental exposure, or shorter life span, may serve as “sentinels” for human environmental health hazards. Traditionally, communication between human and animal health professionals about cross-species sentinel events has been limited, but progress in comparative genomics, animal epidemiology, and bioinformatics can now provide an enhanced forum for such communication. The “One Health” concept involves moving toward a comparative clinical approach that considers “shared risks” between humans and animals and promotes greater cooperation and collaboration between human and animal health professionals to identify and reduce such risks. In doing so, it also creates new opportunities for the field of comparative medicine that can supplement traditional laboratory animal research.

Morera, Neus, Ferry Hagen, Carles Juan-Sallés, Carlos Artigas, Rui Patricio, Juan Ignacio Serra, and Mª Francisca Colom. "Ferrets as Sentinels of the Presence of Pathogenic Cryptococcus Species in the Mediterranean Environment." Mycopathologia 178, no. 1-2 (June 25, 2014): 145–51. http://dx.doi.org/10.1007/s11046-014-9773-1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Tovar-Sánchez, E., L. T. Cervantes, C. Martínez, E. Rojas, M. Valverde, M. L. Ortiz-Hernández, and P. Mussali-Galante. "Comparison of two wild rodent species as sentinels of environmental contamination by mine tailings." Environmental Science and Pollution Research 19, no. 5 (December 9, 2011): 1677–86. http://dx.doi.org/10.1007/s11356-011-0680-4.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

ANDERSON, D. P., D. S. L. RAMSEY, G. NUGENT, M. BOSSON, P. LIVINGSTONE, P. A. J. MARTIN, E. SERGEANT, A. M. GORMLEY, and B. WARBURTON. "A novel approach to assess the probability of disease eradication from a wild-animal reservoir host." Epidemiology and Infection 141, no. 7 (January 23, 2013): 1509–21. http://dx.doi.org/10.1017/s095026881200310x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

SUMMARYSurveying and declaring disease freedom in wildlife is difficult because information on population size and spatial distribution is often inadequate. We describe and demonstrate a novel spatial model of wildlife disease-surveillance data for predicting the probability of freedom of bovine tuberculosis (caused by Mycobacterium bovis) in New Zealand, in which the introduced brushtail possum (Trichosurus vulpecula) is the primary wildlife reservoir. Using parameters governing home-range size, probability of capture, probability of infection and spatial relative risks of infection we employed survey data on reservoir hosts and spillover sentinels to make inference on the probability of eradication. Our analysis revealed high sensitivity of model predictions to parameter values, which demonstrated important differences in the information contained in survey data of host-reservoir and spillover-sentinel species. The modelling can increase cost efficiency by reducing the likelihood of prematurely declaring success due to insufficient control, and avoiding unnecessary costs due to excessive control and monitoring.

Більше джерел

Дисертації з теми "Sentinels species":

Sauser, Christophe. "Les oiseaux marins polaires, sentinelles de la glace de mer : Réponses démographiques et traits d’histoire de vie." Thesis, La Rochelle, 2020. http://www.theses.fr/2020LAROS027.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

L’impact du changement climatique sur la glace de mer et les écosystèmes polaires qui en dépendent est reconnu depuis plusieurs décennies. Cependant, ces milieux sont généralement difficiles à étudier en raison de leur climat extrême, de leur isolement et des difficultés logistiques associées. Le manque de connaissances concernant les mécanismes reliant les traits d’histoire de vie des organismes polaires et la variation de la glace de mer est particulièrement préjudiciable à notre compréhension des conséquences du changement climatique sur les espèces longévives comme les oiseaux marins polaires. Ces derniers, généralement situés au sommet des réseaux trophiques, pourraient cependant constituer des espèces sentinelles des écosystèmes liés à la glace de mer. L’objectif de cette thèse est d’améliorer les connaissances sur les processus impliqués dans les réponses des populations de prédateurs marins polaires aux variations environnementales, et principalement les mécanismes liés à la glace de mer. Pour répondre à cet objectif nous nous sommes basés sur le suivi individuel à long terme de deux espèces d’oiseaux marins polaires, le pétrel des neiges (Pagodroma nivea) et le damier du Cap (Daption capense). Les deux espèces se reproduisent en milieu polaire. L’une est particulièrement dépendante de la glace de mer pour s’alimenter (le pétrel des neiges) tandis que l’autre préfère un habitat libre de glace (le damier du Cap). Au cours de ce travail, nous avons estimé l’influence de facteurs extrinsèques (forçages ascendants, descendants, météorologie locale) et intrinsèques (âge, expérience de reproduction, sexe, colonie) sur les réponses démographiques des espèces à l’aide de modèles multi-états de capture-marquage-recapture. Nous avons également testé l’influence des facteurs environnementaux sur les traits phénotypiques (condition corporelle et phénologie de reproduction) du pétrel des neiges. Chez les damiers du Cap nous montrons une diminution du succès reproducteur ainsi que l’influence de plusieurs paramètres extrinsèques (température de surface de l’eau de mer, prédation, météorologie locale) sur celui-ci. En parallèle nous montrons une augmentation de la survie des adultes et une corrélation de celle-ci avec l’oscillation Antarctique. Chez le pétrel des neiges, nous avons mis en évidence l’influence de la glace de mer et d’autres facteurs extrinsèques (prédation, oscillation Antarctique, météorologie locale) et intrinsèques (sexe, colonie, expérience de reproduction) sur de multiples traits démographiques. Nous avons également montré un décalage (retard) dans la phénologie de reproduction des pétrels des neiges en réponse à des changements environnementaux (concentration de glace de mer, vents) et nous avons constaté que la reproduction retardée avait un impact négatif sur la probabilité d'envol des poussins. Enfin nous avons aussi montré que la concentration de glace de mer et l’oscillation Antarctique ont une influence négative sur la survie et la condition corporelle des juvéniles de pétrel des neiges. Cette thèse permet d’apporter de nouvelles connaissances sur les liens entre glace de mer et les traits d’histoire de vie d’une espèce pagophilique, le pétrel des neiges et d’une espèce moins associée à la glace, le damier du Cap. Ces connaissances permettent de mieux appréhender les conséquences du changement climatique sur les oiseaux marins polaires et les écosystèmes polaires en général, et apporte une contribution à la compréhension de la dynamique des populations concernant les variations démographiques intra spécifiques à fine échelle spatiale
The impact of climate change on sea ice and polar ecosystems has been well recognized. However, these environments are generally difficult to study because of their extreme climate, isolation and the associated logistical difficulties. The lack of knowledge regarding the mechanisms linking the life history traits of polar organisms and sea ice variation limit our understanding of the consequences of climate change on long-lived species such as polar seabirds and sea ice ecosystems. Seabirds, generally located at the top of food webs, could however constitute sentinel species of ecosystems linked to sea ice. The objective of this thesis is to improve knowledge on the processes involved in the responses of polar marine predators to environmental variations, and mainly the mechanisms linked to sea ice. For this purpose we have based our analyses on the long-term monitoring of two polar seabirds, the snow petrel (Pagodroma nivea) and the Cape petrel (Daption capense). Both species breed in polar environments of the Southern Ocean. One is particularly dependent on sea ice for foraging (snow petrel) while the other prefers ice-free habitats (Cape petrel). During this PhD, we estimated the influence of extrinsic factors (top-down, bottom-up, local weather) and intrinsic factors (age, breeding experience, sex and colony) on the demographic responses of these two species using multi-states capture-recapture models. We also tested the influence of environmental factors on phenotypic traits (body condition and breeding phenology) of snow petrels. For the Cape petrel, we show a decrease in breeding success as well as an influence of several extrinsic parameters (sea surface temperature, predation, local weather) on this demographic parameter. We also show an increase in adult survival linked to variations of a large scale climate index, the southern annular mode. Modelling of the population dynamics using a matrix population model indicated a positive population growth rate and suggest that this species probably beneficiates from current climate changes. In snow petrels, we demonstrate the influence of sea ice and other extrinsic factors (predation, southern annular mode, local weather) as well as intrinsic factors (sex, colony, breeding experience) on multiple demographic traits (probabilities of survival, breeding, hatching, and fledging). We also show a shift (delay) in the breeding phenology of snow petrels in response to environmental changes (sea ice concentration, winds), and found that delayed reproduction negatively impacted the probability of fledging. Finally, we show that the sea ice concentration and the southern annular mode have a negative influence on the survival and body condition of juvenile snow petrels. This thesis provides new knowledge on the links between sea ice and the life history traits of two Antarctic polar seabirds characterized by specific dependence to sea ice. This knowledge helps to better understand the consequences of climate change on polar seabirds and polar ecosystems in general, and contributes to the understanding of population dynamics concerning intra-specific demographic variations at a fine spatial scale

Donnelly, Robert Kevin. "An investigation of genetic heterogeneity in a biological sentinel species (Lumbricus rubellus)." Thesis, University of South Wales, 2011. https://pure.southwales.ac.uk/en/studentthesis/an-investigation-of-genetic-heterogeneity-in-a-biological-sentinel-species-lumbricus-rubellus(ab114364-d43b-49c2-b309-6cecd95dcaf2).html.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Studies have indicated the existence of several possible sources of genetic heterogeneity within the sentinel species Lumbricus rubellus that could compromise its suitability for ecotoxicological assessment. The species appears to consist of two genetically divergent cryptic lineages and has been demonstrated to display genetic adaptation towards contaminants within some populations. In order to investigate the cryptic lineages of L rubellus further a combined morphological and DNA barcoding approach was undertaken, with both the mitochondria! COI gene being sequenced and external morphological characters being assessed. Combined barcoding and morphological analysis confirmed the existence of the previously described genetic lineages of L. rubellus and highlighted a potential lineage-specific morphological trait. The effectiveness of this trait in field identification of the two lineages was tested in a blind trial. This indicated that the trait may be particularly effective in successfully identifying the individuals of one of these lineages. The two cryptic lineages were also analysed in a second study featuring cross-amplifying microsatellite loci. Both the sequencing and fragment analysis of these microsatellite loci strongly supported the existence of a high degree of reproductive isolation between the two lineages. Finally microsatellite markers were applied to test the hypothesis of genetic adaptation within L. rubellus populations located along an aerially-deposited nickel contamination gradient. No support was obtained for the existence of genetic adaptation within these populations. This could indicate that the most heavily contaminated sites represent demographic 'sinks' into which individuals immigrate from adjacent less-contaminated regions. The general implications of these studies are that the two lineages of L rubellus should be treated as separate species in future ecotoxicological trials given their high degree of genetic differentiation. An implication of the nickel study is that L. rubellus may display a greater capacity for tolerating toxic metals through phenotypic plasticity than previous studies have indicated.

Guillot, Héloïse. "L’herpetofaune, sentinelle de l’accumulation et des effets des contaminants environnementaux ?" Thesis, La Rochelle, 2017. http://www.theses.fr/2017LAROS024/document.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Le développement des activités industrielles et agricoles du siècle dernier a eu pour conséquence le rejet de substances chimiques dans l’environnement, qui contaminent les écosystèmes, et peuvent s’accumuler dans les plantes, les sédiments, et le long des chaînes alimentaires. Il apparait primordial d’effectuer une évaluation du risque écologique associé à la présence de ces composés dans les milieux naturels et les espèces sentinelles sont des outils judicieux pour déterminer l’exposition des individus et évaluer les conséquences sur les organismes. Les amphibiens et les reptiles possèdent des caractéristiques écologiques et biologiques qui les rendent potentiellement intéressants en tant qu’espèces sentinelles. L’objectif des études présentées dans cette thèse est de déterminer la disponibilité de certaines substances dans l’environnement, et d’évaluer les effets de la contamination environnementale sur les organismes en utilisant plusieurs espèces de reptiles et d’amphibiens, (i) en mesurant les niveaux de polluants accumulés dans les tissus d’espèces de reptiles ; (ii) en évaluant l’influence d’un habitat contaminé sur la morphologie d’adultes de crapaud commun (Bufo bufo) ; (iii) en mesurant de manière expérimentale l’impact d’une molécule fréquemment retrouvée dans l’environnement sur le développement de têtards de crapaud commun. Nos résultats montrent d’une part que les reptiles accumulent efficacement les polluants organiques et les éléments traces métalliques dans leurs tissus, et permettent d’évaluer efficacement la contamination globale d’une zone, mais aussi de mettre en évidence des pollutions ponctuelles localisées. D’autre part, nos travaux montrent une influence de l’habitat agricole sur la morphologie du crapaud commun, potentiellement causé par la présence de contaminants dans ces milieux. Enfin, nous avons pu mettre en évidence un effet de concentrations faibles d’AMPA, métabolite principal du glyphosate, sur le développement de têtards de crapaud commun. Les amphibiens constituent donc des organismes efficaces pour étudier l’impact de la contamination de l’environnement sur les caractéristiques individuelles. Nos travaux montrent ainsi l’utilité de certaines espèces de reptiles et d’amphibiens comme espèces sentinelles de la présence de contaminants dans l’environnement et de leur impact potentiel sur les organismes. Les travaux en écotoxicologie qui portent sur ces organismes restent trop rares, et il est impératif de développer la recherche dans ce domaine, pour participer de manière efficace à l’évaluation du risque environnemental
The development of industrial and agricultural activities over the last century has resulted in the release of chemicals into the environment, which contaminate ecosystems and can accumulate in plants, sediments and across food webs. As such, it is essential to conduct an assessment of the ecological risk associated with the presence of these compounds in natural environments. Achieving this can be aided through the study of sentinel species, which can be used to determine exposure rates of individuals and assess how these subsequently impact wildlife. Amphibians and reptiles display ecological and biological characteristics that may make them particularly attractive as sentinel species. The collection of studies presented in this thesis aims to determine the availability of contaminants in the environment and estimate the effects of this on individual traits of living organisms. Across several species of reptiles and amphibians we, (i) measured levels of pollutants accumulated in the tissues of several reptile species ; (ii) assessed how contaminated habitats impact the morphology of adult common toads (Bufo bufo) ; and (iii) experimentally measured the influence of a molecule frequently detected in the environment on common toad tadpoles’ growth. Results show that reptiles efficiently accumulate organic pollutants and metal trace elements in their tissues, and thereby allow efficient evaluation of the global contamination of an area, as well as the occurrence of localized pollution events. In addition, our work shows an influence of the agricultural habitat on the morphology of adult common toads, which is potentially a consequence of the presence of chemicals in these environments. Finally, we were able to demonstrate an effect of low concentrations of AMPA, the main metabolite of glyphosate, on the development of common toad tadpoles. Amphibians are therefore efficient organisms to study the impact of environmental contamination on individual characteristics. Our work shows the usefulness of certain species of reptiles and amphibians as sentinel species for the presence of contaminants in the environment, and their potential impact on organisms. Ecotoxicological studies on these organisms remain too scarce, and it is imperative to develop research in this field, to participate effectively in the assessment of environmental risk

Bissett, Wesley Thurlow Jr. "Ecosystem health at the Texas coastal bend: a spatial analysis of exposure and response." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85889.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This dissertation investigated locational risks to ecosystem health associated with proximity to industrial complexes. The study was performed at the behest of ranchers and citizens living and working down-prevailing wind from the Formosa Plastics, Inc. and ALCOA facilities located in Calhoun County, Texas. Concerns expressed were for potential genotoxicity resulting from exposure to complex chemical mixtures released by the facilities. Exposure assessment of the marine environment was performed with sediments and oysters from Lavaca Bay being analyzed. Numerous chemicals were found to be present at concentrations considered likely to result in adverse responses in exposed populations. Bayesian geostatistical analysis was performed to determine if the concentrations were affected by a spatial process. Mercury and polycyclic aromatic hydrocarbons were the most notable of the chemicals found to be present at elevated concentrations and affected by a spatial process. Evaluation of maps generated from spatial modeling revealed that proximity to ALCOA resulted in elevated risks for exposure to harmful concentrations of pollutants. Genotoxicity was measured in two sentinel species. Oysters (Crassostrea virginica) were utilized for evaluation of the marine environment and cattle (Bos taurus and Bos taurus crossbred cattle) were chosen for evaluation of the terrestrial environment. Chromosomal aberration analysis was performed on oyster hematocytes. Analysis of the results failed to demonstrate the presence of an important generalized spatial process but some specific locations close to the ALCOA plant had elevations in this measure of genotoxicity. Stress as measured by the lysosomal destabilization assay was also performed on oyster hematocytes. These results were found to be affected by a significant spatial process with the highest degree of destabilization occurring in close proximity to ALCOA. Genotoxicity in cattle was evaluated with the single cell gel electrophoresis assay and chromosomal aberration analysis. Bayesian geostatistical analyis revealed the presence of important spatial processes. DNA-protein cross-linkage was the most notable with a strong indication of increased damage down-prevailing wind from the industrial complexes. Results indicated that proximity to industrial facilities increased the risk for harmful exposures, genotoxicity, and lysosomal destabilization.

de-la-Ossa-Carretero, Jose Antonio. "Assessing sewage disposals in soft-bottom habitats." Doctoral thesis, Universidad de Alicante, 2011. http://hdl.handle.net/10045/24056.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ciliberti, Alexandre. "Le Varan du Nil (Varanus niloticus), indicateur de la pollution des zones humides d’Afrique Sub-Saharienne." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10241/document.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

En Afrique, la contamination des zones humides par les métaux et les pesticides va se poursuivre durablement. Pour autant, le statut toxicologique de ces milieux reste trop peu documente. Le but du présent travail est d’estimer la valeur du varan du Nil (Varanus niloticus) en tant qu’espèce sentinelle pour la contamination des zones humides continentales d’Afrique sub-Saharienne. Plomb, cadmium, et pesticides organochlorés et organophosphorés ont été quantifies, par spectrométrie d’absorption atomique et chromatographie gazeuse (respectivement), dans plusieurs tissus provenant de 71 spécimens issus de quatre sites (au Mali et au Niger) juges a priori inégalement contamines. Bien que des différences claires apparaissent, la contamination environnementale s’avère modérée sur les quatre sites, et ne semble pas constituer un risque notable pour les varans ni pour les humains qui s’en nourrissent occasionnellement. Toutefois la variabilité interindividuelle est importante. Les organotropismes des polluants détectés sont cohérents avec ceux préalablement décrits. Si l’on n’a pu mettre en évidence de différence liée au sexe en ce qui concerne les pesticides, les femelles présentaient des charges en métaux supérieures. La relation entre d’autres facteurs (taille, proportion de graisse) et les concentrations tissulaires a également été considérée. Les varans sont susceptibles de révéler des différences subtiles de contamination environnementale entre sites, et la résolution spatiale de l’outil semble très fine. La possibilité pratique d’utiliser cet indicateur se trouve donc validée. Un travail expérimental sur des varans captifs a par ailleurs été mené pour approfondir l’étude
In Africa, metal and pesticide contamination of wetlands is supposed to continue on a permanent basis. However, the ecotoxicological status of these ecosystems remains poorly documented. The aim of the present work is to assess the value of the Nile monitor (Varanus niloticus) as a sentinel species for the environmental contamination of continental wetlands in sub-Saharan Africa. Lead and cadmium on the one hand, and organochlorine and organophosphate pesticides on the other, have been quantified in several tissues by atomic absorption spectrophotometry and gas chromatography, respectively. Samples come from 71 specimens originating from four sites considered unequally contaminated (in Mali and Niger). Although clear differences appear between sites, the environmental contamination turns out to be moderate at the four sites, and does not seem to represent a significant risk neither for the monitors themselves, nor for occasional human consumers. However, the interindividual variability is important. The organotropisms relative to the detected pollutants are consistent with those described in previous studies. Concerning the pesticides, no gender effect has been found, whereas females were more contaminated by metals. The relation between other factors (size, proportion of fat) and tissue concentrations has been considered too. Nile monitors can reveal subtle differences in local pollution and the spatial resolution of this tool seems to be very sharp. Its practical relevance is thus validated. Additionally, an experimental work has been carried out on captive monitors to go into the subject in greater depth

Spafford, Mark D. "Trout-perch Percopsis omiscomaycus (Walbaum) and lake chub Couesius plumbeus (Agassiz), as sentinel monitoring species in the Athabasca River, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0017/MQ47100.pdf.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Wahls, James Charles Edgar. "Host-Parasitoid Interactions of Two Invasive Drosophilids in Virginia Fruit Crops." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/77690.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

1.) Sentinel traps were used to survey for parasitoids of frugivorous drosophilids in Virginia fruit cropping systems, and determine if parasitoids were attacking invasive flies Drosophila suzukii (Matsumura) and Zaprionus indianus Gupta (Diptera: Drosophilidae) in the field. Two parasitoids of frugivorous drosophilids, Leptopilina boulardi (Barbotin, Carton, and Kelner-Pillault) (Hymenoptera: Figitidae) and Pachycrepoideus vindemiae (Rondani) (Hymenoptera: Pteromalidae), were reared, but only one P. vindemiae was reared from D. suzukii, and no parasitoids were reared from Z. indianus. Most parasitoids were reared from alternate host Drosophila melanogaster Meigen and other wild drosophilids. 2.) The ability of these parasitoids to attack D. melanogaster, D. suzukii and Z. indianus under controlled conditions was tested. Larval parasitoid L. boulardi did not develop on D. suzukii or Z. indianus, just D. melanogaster. Pupal parasitoid P. vindemiae successfully developed on all three fly species, but also increased pupal fly mortality. 3.) Olfactometry was used to ascertain if L. boulardi and P. vindemiae are selective about the type of fruit their hosts feed in. Results showed that among cherry, raspberry, blueberry, grape, and banana, L. boulardi preferred raspberry and banana to cherry, and preferred grape least, but no fruit was most preferred. Insufficient data were obtained for P. vindemiae. We conclude that parasitoids of Virginia are unlikely to provide effective biological control for D. suzukii or Z. indianus, and classical biological control should be investigated as a pest management option. Olfactometry results indicate tritrophic selectivity by Drosophila parasitoids, suggesting multiple parasitoids could be required for effective biological control.
Master of Science in Life Sciences

Olsen-Mikitowiez, Victoria Michaelina. "Prevalence of Dirofilaria Immitis, The Causitive Agent in Canine Heartworm Disease, in Arizona from 2008 to 2011 Using Feral Canines as a Sentinel Species." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144918.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Barhoumi, Badreddine. "Biosurveillance de la pollution de la lagune de Bizerte (Tunisie) par l’analyse comparée des niveaux de contamination et de l’écotoxicité des sédiments et du biote." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0075/document.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

L’objectif de cette thèse est le diagnostic de l’état de santé de la lagune de Bizerte par une approche multi-marqueurs (chimique, biochimique et morphométrique) et multi-compartiments (sédiment et biote). Pour atteindre cet objectif, les modèles biologiques choisis sont la moule Mytilus galloprovincialis et le poisson gobie Zosterisessor ophiocephalus. Ces deux espèces sont largement répandues dans la lagune de Bizerte et la mer Méditerranée. Dans une première partie et afin d’estimer les niveaux de contamination de la lagune de Bizerte par les polluants organiques persistants (POPs), des analyses chimiques, granulométriques et minéralogiques (COT) de sédiments superficiels ont été réalisées. Par la suite la toxicité potentielle des sédiments a été évaluée par une batterie de bioessais. Dans une troisième partie la biodisponibilité et l’impact écotoxicologique des POPs étudiés ont été évalués par l’accumulation de ces contaminants au niveau des deux organismes indicateurs choisis et l’étude des réponses biologiques associées à travers quelques biomarqueurs tels que la catalase (CAT), l’acide thiobarbiturique (TBARS); l’Ethoxyrésorufine O-dééthylase (EROD); la glutathion-S-transférase (GST) et l'acétylcholinestérase (AChE). Les principaux résultats des analyses chimiques révèlent une contamination générale des sédiments et organismes étudiés par les POPs. Les niveaux de contamination sont fonction de l’espèce et de la station étudiée. La comparaison de nos valeurs avec les données de la littérature a montré que les niveaux de contamination de la lagune sont similaires ou légèrement inférieurs à ceux enregistrés dans des écosystèmes équivalents dans d’autres pays du monde. L’estimation de la toxicité des sédiments au moyen des valeurs guides sédimentaires (ERL, ERM, TEL et PEL) et trois tests biologiques (Microtox®, SOS-Chromotest® et test MELA) ont montré que les sédiments des stations du canal de Bizerte S1 et S3 représentent un danger accru pour les organismes aquatiques. Nos résultats ont montré que les biomarqueurs mesurés chez les deux espèces choisies sont des paramètres sensibles et inductibles permettant de qualifier l’état de santé des organismes et la qualité globale du milieu étudié. Les marqueurs morphométriques contrairement aux marqueurs biochimiques n’ont pas permis de discriminer les différents sites étudiés. Contrairement aux poissons, il a été démontré chez les moules que les facteurs abiotiques ont une influence sur les concentrations en POPs et les réponses des biomarqueurs.Au vu de l’ensemble de ces résultats, il apparaît que cette approche intégrative associant des mesures chimiques et écotoxicologiques représente un bon moyen pour évaluer la qualité de l’environnement notamment dans le cadre de programmes de biosurveillance
The objective of this thesis was the diagnosis of the health status of the Bizerte lagoon using a multi-marker (chemical, biochemical and morphometric) and multi-compartment approach (sediment and biota). To achieve this objective, the selected biological models were the mussel Mytilus galloprovincialis and the goby fish Zosterisessor ophiocephalus. Both species are widespread in the Bizerte lagoon and the Mediterranean Sea. In a first part and in order to estimate the levels of contamination of the Bizerte lagoon, persistent organic pollutant (POPs), granulometric and mineralogical (TOC) analyses of surficial sediments were carried out. Afterwards, the potential toxicity of sediments was assessed by a battery of bioassays. In a the third part, bioavailability and ecotoxicological impact of POPs studied were assessed by bioaccumulation measurement in these two indicators species, and the study of biological responses associated through a battery of biomarkers such as catalase (CAT), thiobarbituric acid (TBARS); Ethoxyresorufin O-deethylase (EROD); glutathione-S-transferase (GST) and acetylcholinesterase (AChE). The main results of the chemical analyses show a general contamination of sediments and organisms studied by POPs. Contamination levels are dependent on the studied species and stations. Comparing our values with literature data, showed that the levels of contamination of the lagoon are similar or slightly lower than equivalent ecosystems in other parts of the world. Besides, the estimation of sediment toxicity, using sediment guideline values (ERL, ERM, TEL et PEL), as well as bioassays (Microtox®, SOS-Chromotest® and MELA test) showed that stations of canal of Bizerte S1 and S3 were associated with an increased hazard to aquatic organisms. Our results showed that biomarkers measured in both selected species are sensitive and inducible parameters, which allowed to characterize the health status of organisms and global quality of the studied environment. Biochemical but not morphometric markers allowed to discriminate the different studied sites according to chemical risk. Unlike fish, it has been demonstrated in mussels that abiotic factors influence the concentrations of POPs and biomarker responses.Obtained data suggest that integrative approach, combining chemical and ecotoxicological measurements, may represent a good way to asses the quality of the environment, particularly, in the context of biomonitoring programs

Більше джерел

Книги з теми "Sentinels species":

Menefee, Samuel Pyeatt. Trends in maritime violence: A special report from Jane's intelligence review and Jane's sentinel. Coulsdon, Surrey, UK: Jane's Information Group, 1996.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Galeotti, Mark. Unstable Russia: A regional commercial risk assessment : a Special Report from Jane's Intelligence Review and Jane's Sentinel. Coulsdon, U.K: Jane's Information Group, 1996.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Jane's Sentinel Special Report-Terrorism (Jane's Special Reports). Janes Information Group, 1995.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Menefee, Samuel Pyeatt. Trends in Maritime Violence: A Special Report from Jane's Intelligence Review and Jane's Sentinel (Jane's Special Reports). Jane's Information Group, 1997.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Terry, Bowyer R., and Wildlife Society, eds. Effects of the Exxon Valdez oil spill on river otters: Injury and recovery of a sentinel species. Bethesda, Md: Wildlife Society, 2003.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Terry, Bowyer R., and Wildlife Society, eds. Effects of the Exxon Valez oil spill on river otters: Injury and recovery of a sentinel species. [Bethesda, Md.]: Wildlife Society, 2003.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Частини книг з теми "Sentinels species":

Sonne, Christian, Robert J. Letcher, Bjørn M. Jenssen, Jean-Pierre Desforges, Igor Eulaers, Emilie Andersen-Ranberg, Kim Gustavson, et al. "Sled Dogs as Sentinel Species for Monitoring Arctic Ecosystem Health." In Pets as Sentinels, Forecasters and Promoters of Human Health, 21–45. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30734-9_2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Schwacke, Lori H., Frances M. Gulland, and Susan White. "Sentinel Species ocean/oceanic sentinel species in Oceans ocean/oceanic and Human Health human health." In Encyclopedia of Sustainability Science and Technology, 9156–74. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_831.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Schwacke, Lori H., Frances M. Gulland, and Susan White. "Sentinel Species in Oceans and Human Health." In Environmental Toxicology, 503–28. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5764-0_18.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Custer, Christine M. "Swallows as a Sentinel Species for Contaminant Exposure and Effect Studies." In Emerging Topics in Ecotoxicology, 45–91. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-0-387-89432-4_3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Richards, Ngaio L., Gregg Tomy, Chad A. Kinney, Frankline C. Nwanguma, Braden Godwin, and Deborah A. Woollett. "Using Scat Detection Dogs to Monitor Environmental Contaminants in Sentinel Species and Freshwater Ecosystems." In Using Detection Dogs to Monitor Aquatic Ecosystem Health and Protect Aquatic Resources, 193–262. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77356-8_6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Uz, Stephanie Schollaert, Christopher W. Brown, Andrew K. Heidinger, Tim J. Smyth, and Raghu Murtugudde. "Monitoring a Sentinel Species from Satellites: Detecting Emiliania huxleyi in 25 Years of AVHRR Imagery." In Satellite-based Applications on Climate Change, 277–88. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5872-8_18.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Santos, M. M., and N. M. Monteiro. "Chapter 13. Blenniidae and Syngnathidae: Partially Unexplored Reservoirs of Sentinel Species for Environmental Monitoring Studies." In Issues in Toxicology, 305–26. Cambridge: Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781782629887-00305.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

"- Sentinel Species." In Ecological Biomarkers, 170–201. CRC Press, 2016. http://dx.doi.org/10.1201/b13036-11.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Lower, W. R., and R. J. Kendall. "Sentinel Species and Sentinel Bioassay." In Biomarkers of Environmental Contamination, 309–31. CRC Press, 2018. http://dx.doi.org/10.1201/9781351070263-24.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Sá Teles de Oliveira Molina, Juliana, Andreia Moreira dos Santos Carmo, Gabriel Lopes Pereira, Leticia Abrantes de Andrade, Felipe Trovalim Jordão, Rodrigo Buzinaro Suzuki, Luana Prado Rolim de Oliveira, Aline Diniz Cabral, and Márcia Aparecida Sperança. "Novel Single Hematophagous Insect RNA Detection Method Supports Its Use as Sentinels to Survey Flaviviruses Circulation." In Dengue Fever in a One Health Perspective. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92071.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Anthropogenic actions, including deforestation, disorganized urbanization, and globalization, contribute to emergence and reemergence of arboviruses worldwide, where Flavivirus is the most prevalent, and its continuous monitoring can help in preventive control strategies. Thus, the aim of this study was to detect flavivirus RNA in single hematophagous insects, which are used as sentinels. Total RNA was extracted from six Aedes aegypti stored since 2003 and from 100 Culicidae and collected through CDC trap in a public park of a Brazilian Northwest city of São Paulo State. Flavivirus was detected through RT/PCR targeting 230–250 bp of the RNA polymerase coding sequence (NS5). PCR amplicons were sequenced by Sanger method, used in comparative analysis over Basic Local Alignment Search Tool (BLAST) in GenBank, and subjected to Neighbor-Joining phylogenetic analyses. Efficiency of Flavivirus diagnosis was confirmed by detection of Dengue virus serotype 2 in Ae. aegypti. From the 100 collected insects, 19 were positive for Culex flavivirus (CxFV). NS5 partial sequence phylogenetic analysis clustered all CxFV in one branch separated from vertebrate flaviviruses, being applicable to the identification of Flavivirus species. The dipteran RNA extraction methodology described in this work supports detection of flaviviruses in single insects maintained in 80% ethanol, which can be used to constant arbovirus surveillance.

Тези доповідей конференцій з теми "Sentinels species":

Pham, Tien Dat, Junshi Xia, Gerald Baier, Nga Nhu Le, and Naoto Yokoya. "Mangrove Species Mapping Using Sentinel-1 and Sentinel-2 Data in North Vietnam." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8898987.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Chehata, Nesrine, Hedia Chakroun, Rania Youssfi, Mohamed Amine Maaoui, Anis Manai, Rami Werhani, Kamel Aloui, Nizar Kouki, Wafa Talhaoui, and Thouraya Sahli. "Improving Forest Species Mapping Using Sentinel-2 Time Series." In 2020 Mediterranean and Middle-East Geoscience and Remote Sensing Symposium (M2GARSS). IEEE, 2020. http://dx.doi.org/10.1109/m2garss47143.2020.9105159.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Sinica-Sinavskis, Juris, Romans Dinuls, Juris Zarins, and Ints Mednieks. "Automatic tree species classification from Sentinel-2 images using deficient inventory data." In 2020 17th Biennial Baltic Electronics Conference (BEC). IEEE, 2020. http://dx.doi.org/10.1109/bec49624.2020.9276810.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Denisova, Anna, Ludmila Kavelenova, Evgeniy Korchikov, Nataly Prokhorova, Daria Terentyeva, and Victor Fedoseev. "Tree species classification for clarification of forest inventory data using Sentinel-2 images." In Seventh International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2019), edited by Giorgos Papadavid, Kyriacos Themistocleous, Silas Michaelides, Vincent Ambrosia, and Diofantos G. Hadjimitsis. SPIE, 2019. http://dx.doi.org/10.1117/12.2531805.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Karasiak, N., D. Sheeren, M. Fauvel, J. Willm, J. F. Dejoux, and C. Monteil. "Mapping tree species of forests in southwest France using Sentinel-2 image time series." In 2017 9th International Workshop on the Analysis of Multitemporal Remote Sensing Images (MultiTemp). IEEE, 2017. http://dx.doi.org/10.1109/multi-temp.2017.8035215.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Stoleriu, Alexandra-Petronela. "USING SENTINEL 2 TIME SERIES FOR FOREST TREE SPECIES CLASSIFICATION. CASE STUDY: NE OF ROMANIA." In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019v/1.4/s03.054.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Forster, Michael, Tobias Schmidt, Roman Wolf, Birgit Kleinschmit, Fabian E. Fassnacht, Julian Cabezas, and Teja Kattenborn. "Detecting the spread of invasive species in central Chile with a Sentinel-2 time-series." In 2017 9th International Workshop on the Analysis of Multitemporal Remote Sensing Images (MultiTemp). IEEE, 2017. http://dx.doi.org/10.1109/multi-temp.2017.8035216.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Persson, Henrik J., Johan E. S. Fransson, Jonas Jonzen, and Mats Nilsson. "Combining TanDEM-X, Sentinel-2 and Field Data for Prediction of Species-Wise Stem Volumes." In IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2020. http://dx.doi.org/10.1109/igarss39084.2020.9324055.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Li, Hongzhong, Yu Han, and Jinsong Chen. "Exploring the Capabilities of Combining The Sentinel-2 MSI Data And High Resolution Google Earth Image For Mapping Mangrove Species." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8898432.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Punalekar, Suvarna M., Carole Planque, Patryk Poslajko, Richard Lucas, Sebastien Chognard, Christopher J. Owers, Peter Bunting, Daniel Clewley, and Claire Horton. "Mapping dominant genus/species types in natural and seminatural landscapes across Wales through application of Sentinel-2 time-series data." In Remote Sensing for Agriculture, Ecosystems, and Hydrology XXII, edited by Christopher M. Neale and Antonino Maltese. SPIE, 2020. http://dx.doi.org/10.1117/12.2574005.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Sentinels species":

Hoffman, Bruce. Bin Ladin's Killing and its Effect on Al-Qa`ida: What Comes Next? CTC Sentinel, Special Issue, May 2011. Fort Belvoir, VA: Defense Technical Information Center, May 2011. http://dx.doi.org/10.21236/ada544995.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Mattrey, Robert F. Tagging of Breast Tumors for Excision and Specimen Radiography and of Sentinel Nodes for Ultrasound-Guided Localization Using Novel Particulate Agents. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada382950.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

McCarthy, Noel, Eileen Taylor, Martin Maiden, Alison Cody, Melissa Jansen van Rensburg, Margaret Varga, Sophie Hedges, et al. Enhanced molecular-based (MLST/whole genome) surveillance and source attribution of Campylobacter infections in the UK. Food Standards Agency, July 2021. http://dx.doi.org/10.46756/sci.fsa.ksj135.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This human campylobacteriosis sentinel surveillance project was based at two sites in Oxfordshire and North East England chosen (i) to be representative of the English population on the Office for National Statistics urban-rural classification and (ii) to provide continuity with genetic surveillance started in Oxfordshire in October 2003. Between October 2015 and September 2018 epidemiological questionnaires and genome sequencing of isolates from human cases was accompanied by sampling and genome sequencing of isolates from possible food animal sources. The principal aim was to estimate the contributions of the main sources of human infection and to identify any changes over time. An extension to the project focussed on antimicrobial resistance in study isolates and older archived isolates. These older isolates were from earlier years at the Oxfordshire site and the earliest available coherent set of isolates from the national archive at Public Health England (1997/8). The aim of this additional work was to analyse the emergence of the antimicrobial resistance that is now present among human isolates and to describe and compare antimicrobial resistance in recent food animal isolates. Having identified the presence of bias in population genetic attribution, and that this was not addressed in the published literature, this study developed an approach to adjust for bias in population genetic attribution, and an alternative approach to attribution using sentinel types. Using these approaches the study estimated that approximately 70% of Campylobacter jejuni and just under 50% of C. coli infection in our sample was linked to the chicken source and that this was relatively stable over time. Ruminants were identified as the second most common source for C. jejuni and the most common for C. coli where there was also some evidence for pig as a source although less common than ruminant or chicken. These genomic attributions of themselves make no inference on routes of transmission. However, those infected with isolates genetically typical of chicken origin were substantially more likely to have eaten chicken than those infected with ruminant types. Consumption of lamb’s liver was very strongly associated with infection by a strain genetically typical of a ruminant source. These findings support consumption of these foods as being important in the transmission of these infections and highlight a potentially important role for lamb’s liver consumption as a source of Campylobacter infection. Antimicrobial resistance was predicted from genomic data using a pipeline validated by Public Health England and using BIGSdb software. In C. jejuni this showed a nine-fold increase in resistance to fluoroquinolones from 1997 to 2018. Tetracycline resistance was also common, with higher initial resistance (1997) and less substantial change over time. Resistance to aminoglycosides or macrolides remained low in human cases across all time periods. Among C. jejuni food animal isolates, fluoroquinolone resistance was common among isolates from chicken and substantially less common among ruminants, ducks or pigs. Tetracycline resistance was common across chicken, duck and pig but lower among ruminant origin isolates. In C. coli resistance to all four antimicrobial classes rose from low levels in 1997. The fluoroquinolone rise appears to have levelled off earlier and among animals, levels are high in duck as well as chicken isolates, although based on small sample sizes, macrolide and aminoglycoside resistance, was substantially higher than for C. jejuni among humans and highest among pig origin isolates. Tetracycline resistance is high in isolates from pigs and the very small sample from ducks. Antibiotic use following diagnosis was relatively high (43.4%) among respondents in the human surveillance study. Moreover, it varied substantially across sites and was highest among non-elderly adults compared to older adults or children suggesting opportunities for improved antimicrobial stewardship. The study also found evidence for stable lineages over time across human and source animal species as well as some tighter genomic clusters that may represent outbreaks. The genomic dataset will allow extensive further work beyond the specific goals of the study. This has been made accessible on the web, with access supported by data visualisation tools.

Hendricks, Kasey. Data for Alabama Taxation and Changing Discourse from Reconstruction to Redemption. University of Tennessee, Knoxville Libraries, 2021. http://dx.doi.org/10.7290/wdyvftwo4u.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

At their most basic level taxes carry, in the words of Schumpeter ([1918] 1991), “the thunder of history” (p. 101). They say something about the ever-changing structures of social, economic, and political life. Taxes offer a blueprint, in both symbolic and concrete terms, for uncovering the most fundamental arrangements in society – stratification included. The historical retellings captured within these data highlight the politics of taxation in Alabama from 1856 to 1901, including conflicts over whom money is expended upon as well as struggles over who carries their fair share of the tax burden. The selected timeline overlaps with the formation of five of six constitutions adopted in the State of Alabama, including 1861, 1865, 1868, 1875, and 1901. Having these years as the focal point makes for an especially meaningful case study, given how much these constitutional formations made the state a site for much political debate. These data contain 5,121 pages of periodicals from newspapers throughout the state, including: Alabama Sentinel, Alabama State Intelligencer, Alabama State Journal, Athens Herald, Daily Alabama Journal, Daily Confederation, Elyton Herald, Mobile Daily Tribune, Mobile Tribune, Mobile Weekly Tribune, Morning Herald, Nationalist, New Era, Observer, Tuscaloosa Observer, Tuskegee News, Universalist Herald, and Wilcox News and Pacificator. The contemporary relevance of these historical debates manifests in Alabama’s current constitution which was adopted in 1901. This constitution departs from well-established conventions of treating the document as a legal framework that specifies a general role of governance but is firm enough to protect the civil rights and liberties of the population. Instead, it stands more as a legislative document, or procedural straightjacket, that preempts through statutory material what regulatory action is possible by the state. These barriers included a refusal to establish a state board of education and enact a tax structure for local education in addition to debt and tax limitations that constrained government capacity more broadly. Prohibitive features like these are among the reasons that, by 2020, the 1901 Constitution has been amended nearly 1,000 times since its adoption. However, similar procedural barriers have been duplicated across the U.S. since (e.g., California’s Proposition 13 of 1978). Reference: Schumpeter, Joseph. [1918] 1991. “The Crisis of the Tax State.” Pp. 99-140 in The Economics and Sociology of Capitalism, edited by Richard Swedberg. Princeton University Press.