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Academic literature on the topic 'Abundance'

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Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Abundance"

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List Sánchez, Rurik H., and David W. Macdonald. "Carnivora atnd their larger mammalian prey species invenory and abundance in the Janos-Nuevo Casas Grandes praire dog complex, Chihuahua." Revista Mexicana de Mastozoología (Nueva Epoca) 3, no. 1 (January 23, 2014): 95. http://dx.doi.org/10.22201/ie.20074484e.1998.3.1.62.

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Abstract. This study examined the carnivore species composition and abundance in the Janos-Nuevo Casas Grandes prairie dog complex of north-western Chihuahua, Mexico. Thirteen species of carnivores were recorded in habitats including prairie dog towns, grassland, mesquite scrub and riparian vegetation. From artificial scent-stations and spotlight transects the most abundant carnivore species appeared to be the kit fox Vulpes macrotis and the coyote Canis latrans. Striped/hooded skunks (Mephitis spp) and American badgers (Taxidea taxus) were also common. No significant differences were found between the abundance of kit foxes or coyotes on prairie dog towns or grassland; but skunks were more abundant on grasslands. The abundance of hares (Lepus californicus), rabbit (Sylvilagus audubonii), and kangaroo rat (Dipodomys spp) was also estimated; hares and kangaroo rats were more abundant in the grassland, whilst rabbits were more abundant in prairie dog towns.Resumen. Se estudió la composición de espeices de carnívoros en el complejo de perros llaneros Janos-Nuevo Casas Grandes, en el noroeste de Chihuahua, México. Se registraron 13 especies de carnívoros en los siguientes hábitats; colonias de perros lIaneros, pastizal, matorral de mezquite y vegetación riparia. Por medio de estaciones olfativas y transectos de lampareo se determinó que la zorra norteña Vulpes macrotis y el coyote Canis latrans fueron los más abundantes. Los zorrillos (Mephitis spp) y tejones (Taxidea taxus) también fueron comunes. No se encontraron diferencias significativas en la abundancia de zorras norteñas o coyotes entre colonias de perros llaneros o pastizal. Los zorrillos fueron más abundantes en el pastizal. También se estimó la abundancia de liebres (Lepus californicus), conejos (Sylvilagus audubonii), y ratas canguro (Dipodomys spp); las liebres y ratas canguro son más abundantes en el pastizal, mientras los conejos son mas abundantes en las colonias de perros lIaneros.Key words: Carnivore abundance, Chihuahua, Mexico, prairie dog, scent-station, spotlighting.
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Sherman, CS, MR Heupel, SK Moore, A. Chin, and CA Simpfendorfer. "When sharks are away, rays will play: effects of top predator removal in coral reef ecosystems." Marine Ecology Progress Series 641 (May 7, 2020): 145–57. http://dx.doi.org/10.3354/meps13307.

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Shark abundances are decreasing on many coral reefs, but the ecosystem effects of this loss are poorly understood. Rays are a prevalent mesopredator in tropical coral reef ecosystems that are preyed upon by top predators like sharks. Studies have suggested reduced predator abundances lead to increases in mesopredator abundance (mesopredator release). We examined the relationship between top predator abundances and the abundance and behaviour of 2 small benthic ray genera using baited remote underwater video systems (BRUVS) across 6 countries. Where predators were more abundant, 2 genera of small benthic rays were sighted less often, possibly because of lower abundances. Small ray behaviour was also significantly affected by predator abundance. Individuals of focal ray species visited BRUVS significantly fewer times at sites with higher predator abundances. Where predators were less abundant, rays spent significantly more time in the video frame, and were more likely to feed from bait bags. In addition to predator abundance, small ray presence was significantly influenced by reef relief and depth. Neotrygon spp. were more abundant on deeper, lower relief habitats, while Taeniura spp. were more prevalent in reef-associated shallow, high relief habitats. Overall, this study found that predator abundance had a significant effect on small benthic ray abundance and behaviour in the presence of BRUVS. Results demonstrate that changes in both abundance and behaviour associated with predator loss may make the interpretation of phenomenon like mesopredator release more difficult to identify unless behavioural effects are considered.
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Crozier, Gaea E., and Dale E. Gawlik. "Avian Response to Nutrient Enrichment in an Oligotrophic Wetland, the Florida Everglades." Condor 104, no. 3 (August 1, 2002): 631–42. http://dx.doi.org/10.1093/condor/104.3.631.

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Abstract We studied the effects of nutrient enrichment on the bird community in an oligotrophic wetland, the Florida Everglades. Among the non-wading birds surveyed in 1996 and 1997, Boat-tailed Grackles (Quiscalus major) and Common Moorhens (Gallinula chloropus) were consistently more abundant in enriched sites, whereas Common Yellowthroats (Geothlypis trichas) were consistently more abundant in unenriched sites. The abundance of Red-winged Blackbird (Agelaius phoeniceus) was not significantly different between enriched and unenriched sites. Among wading birds, Wood Storks (Mycteria americana) and Great Egrets (Ardea alba) were significantly more abundant in enriched than unenriched areas in a dry year, 1991. Great Egrets and all wading species combined were significantly more abundant in enriched than unenriched areas in the wet year, 1995. Great Blue Herons (Ardea herodias) and White Ibises (Eudocimus albus) did not differ in abundance between enriched and unenriched areas in the dry or wet year. A significant interaction between water depth and nutrient status in the wet year indicated that wading bird abundance increased with water depth only in nutrient-enriched areas presumably because the enriched areas had greater food availability than unenriched areas at the same water depth. Bird abundance appeared to increase in nutrient-enriched areas; however, this increase was accompanied by a shift in species composition typically found in the unenriched Everglades and was a fundamental change in the Everglades' distinctive structure. Respuestas de las Aves al Enriquecimiento con Nutrientes en un Humedal Oligotrófico, en los Pantanos de los Everglades en Florida Resumen. Estudiamos los efectos del enriquecimiento con nutrientes sobre la comunidad de aves en un humedal oligotrófico, los pantanos de los Everglades en Florida. Entre las aves no vadeadoras censadas en 1996 y 1997, Quiscalus major y Gallinula chloropus fueron consistentemente más abundantes en sitios enriquecidos, mientras que Geothlypis trichas fue consistentemente más abundante en sitios no enriquecidos. La abundancia de Agelaius phoeniceus no difirió significativamente entre los sitios enriquecidos y no enriquecidos. Entre las aves vadeadoras, Mycteria americana y Ardea alba fueron significativamente más abundantes en áreas enriquecidas que en las no enriquecidas durante 1991, un año seco. En 1995, un año húmedo, Ardea alba y todas las demás aves vadeadoras fueron significativamente más abundantes en áreas enriquecidas que en las no enriquecidas. Ardea herodias y Eudocimus albus no difirieron en abundancia entre áreas enriquecidas y no enriquecidas en el año húmedo ni en el año seco. En el año húmedo, encontramos una interacción significativa entre la profundidad del agua y el estado de los nutrientes, lo que indicó que la abundancia de aves vadeadoras aumentó sólo en las áreas enriquecidas con nutrientes, presumiblemente debido a que las áreas enriquecidas presentaron mayor disponibilidad de alimento que las áreas no enriquecidas de una profundidad de agua equivalente. La abundancia de aves pareció aumentar en las áreas enriquecidas con nutrientes; sin embargo, este incremento estuvo acompañado con un cambio en la composición de las especies encontradas normalmente en los pantanos de los Everglades de Florida que no han sido enriquecidos, y representó un cambio fundamental en la estructura característica de los Everglades.
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Irvine, James R., and Masa-aki Fukuwaka. "Pacific salmon abundance trends and climate change." ICES Journal of Marine Science 68, no. 6 (March 2, 2011): 1122–30. http://dx.doi.org/10.1093/icesjms/fsq199.

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Abstract Irvine, J. R., and Fukuwaka, M. 2011. Pacific salmon abundance trends and climate change. – ICES Journal of Marine Science, 68: 1122–1130. Understanding reasons for historical patterns in salmon abundance could help anticipate future climate-related changes. Recent salmon abundance in the northern North Pacific Ocean, as indexed by commercial catches, has been among the highest on record, with no indication of decline; the 2009 catch was the highest to date. Although the North Pacific Ocean continues to produce large quantities of Pacific salmon, temporal abundance patterns vary among species and areas. Currently, pink and chum salmon are very abundant overall and Chinook and coho salmon are less abundant than they were previously, whereas sockeye salmon abundance varies among areas. Analyses confirm climate-related shifts in abundance, associated with reported ecosystem regime shifts in approximately 1947, 1977, and 1989. We found little evidence to support a major shift after 1989. From 1990, generally favourable climate-related marine conditions in the western North Pacific Ocean, as well as expanding hatchery operations and improving hatchery technologies, are increasing abundances of chum and pink salmon. In the eastern North Pacific Ocean, climate-related changes are apparently playing a role in increasing chum and pink salmon abundances and declining numbers of coho and Chinook salmon.
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Zaffos, Andrew, and Steven M. Holland. "Abundance and extinction in Ordovician–Silurian brachiopods, Cincinnati Arch, Ohio and Kentucky." Paleobiology 38, no. 2 (2012): 278–91. http://dx.doi.org/10.1666/10026.1.

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A basic hypothesis in extinction theory predicts that more abundant taxa have an evolutionary advantage over less abundant taxa, which should manifest as increased survivorship during major extinction events and longer fossil-record durations. Despite this, various paleontologic studies have found conflicting patterns, indicating a more complex relationship between abundance and extinction in the geologic past. This study tests the relationship between abundance and extinction among brachiopod genera within seven third-order depositional sequences spanning the Late Ordovician to Early Silurian (Katian–Aeronian) of the Cincinnati Arch.Contrary to predictions, abundance is not positively correlated with duration in this study. Abundance and duration range from strongly negatively correlated to uncorrelated depending on the spatial scale of analysis and the geologic intervals included, but correlations never indicate that abundance is an evolutionary advantage. In contrast, abundance was an advantageous trait prior to the Ordovician/Silurian extinction, and brachiopods with higher abundances were more likely to survive the event than less abundant brachiopods. While this result is in keeping with common models of extinction, it has not been observed previously at a mass extinction boundary. This may be further evidence that the Ordovician/Silurian extinction was not accompanied by a shift in the macroevolutionary selectivity regime.
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Brygadyrenko, Viktor. "Evaluation of ecological niches of abundant species of Poecilus and Pterostichus (Coleoptera: Carabidae) in forests of steppe zone of Ukraine." Entomologica Fennica 27, no. 2 (August 20, 2019): 81–100. http://dx.doi.org/10.33338/ef.84662.

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This article analyses abundances of seven Poecilus and Pterostichus species sampled from 836 forest sites located in five geographical regions of the steppe zone of Ukraine. The abundances are analysed in relation to eight forest conditions. New information about associations of the following five species was found. Poecilus versicolor was most abundant in sparse forest sites and on moist sandy soil. Pterostichus melanarius reached its maximum abundance on sites with a thick litter layer, mesohygrophilous condition, clay soils and a sparse herbaceous layer. Pterostichus niger reached maximum abundance in forests with mesohygrophilous and hygrophilous conditions and on sandy loam soils. Abundance of Pterostichus oblongopunctatus was at the highest on sites with a closed tree canopy, a thin litter layer and loamy soils of average salinity. Pterostichus ovoideus was most abundant in forests with low to average litter depth, hygrophilous conditions and loamy soils oflow to average salinity. For Poecilus sericeus and Poecilus cupreus the results ofthis study agreed with the published information.
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Çalışkan, Şeyma, Elisabetta Caffau, Piercarlo Bonifacio, Luca Sbordone, and Berahitdin Albayrak. "Abundance analysis of three metal poor stars: CS 22166-0030, CS 22186-0005, and CS 30344-0033." Proceedings of the International Astronomical Union 9, S298 (May 2013): 381–86. http://dx.doi.org/10.1017/s1743921313006595.

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AbstractWe present the abundance analysis of three very metal poor stars, CS 22166-0030 ([Fe/H]=−2.96), CS 22186-0005 ([Fe/H]=−2.70), and CS 30344-0033 ([Fe/H]=−2.90). Our study is based on high resolution spectra which were obtained from SARG (on TNG), HARPS (on 3.6m), and UVES (on VLT) spectrographs and one-dimensional ATLAS9 model atmospheres. We derived the abundances for 2, 9, and 16 atomic species in the spectrum of CS 22166-0030, CS 22186-0005, and CS 30344-0033, respectively. The Na and Mg abundances of CS 22166-0030 are highly under-abundant with respect to the solar values. The abundance patterns of CS 22186-0005 and CS 30344-0033 are consistent with the other halo stars within abundance uncertainties.
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Piovesan, Paulo Ricardo Rodrigues, José Luís Campana Camargo, Robyn Jeanette Burnham, and Isolde Dorothea Kossmann Ferraz. "Abundance of liana species in an Amazonian forest of Brazil reflects neither adventitious root nor foliar sprout production." Journal of Tropical Ecology 34, no. 4 (July 2018): 257–67. http://dx.doi.org/10.1017/s0266467418000238.

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Abstract:Liana abundance and size have increased in neotropical forests. High vegetative reproductive capacity (clonality) may be the cause of high abundance in some liana species. Correlations between vegetative propagation capacity and (1) relative abundance of liana species, (2) rooting and foliar sprouting potentials of congeneric species, and (3) phylogenetic position were determined. Species selection was based on the relative abundance of lianas in ten 0.5-ha parcels in continuous forest within the Biological Dynamics of Forest Fragments Project (BDFFP), Brazil. Five individuals per species were replicated with seven cuttings per individual. Cuttings placed in moistened sand and coconut fibre were observed for 5 mo in a humid greenhouse. Survival percentage, rooting percentage, potential regeneration index and longest root length were determined per species. The two most abundant species (9.3% and 4.1% relative abundance) had low vegetative regeneration capacity, contrary to expectations. However, a significant, positive relationship between vegetative propagation and relative abundance of liana species whose relative abundances were <4% was found. Congeneric species showed no difference in vegetative propagation between rare and abundant species, except congeners of Machaerium. Vegetative reproductive capacity occurred in all major evolutionary lineages, but was highest in Fabaceae and Bignoniaceae, families of high abundance both locally and broadly across Neotropical forests.
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Poulin, R., J. L. Luque, F. Guilhaumon, and D. Mouillot. "Species abundance distributions and numerical dominance in gastrointestinal helminth communities of fish hosts." Journal of Helminthology 82, no. 3 (September 2008): 193–202. http://dx.doi.org/10.1017/s0022149x08982626.

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AbstractThe abundances of different species in a parasite community are never similar: there is typically one or a few numerically dominant species and many species with low abundance. Here, we determine whether basic features of parasite communities are associated with strong dominance by one or a few species, among 39 component communities of gastrointestinal helminths in marine fishes from Brazil. First, we tested whether the shape of the species abundance distribution in these communities fits that predicted by several theoretical models, using a goodness-of-fit procedure. Only the canonical lognormal model could be rejected for 5 out of 39 communities; all other comparisons of observed and predicted abundance distributions showed no significant differences, although this may be due to limited statistical power. Second, we used the ratio between the abundance of the most abundant species and either the second or third most abundant species, as indices of dominance; these show, for instance, that the dominant species in a community is typically twice, but sometimes over ten times, as abundant as the next most abundant species. We found that these ratios were not influenced by either the community's species richness, the mean number of individual parasites per host, or the taxonomic identity of the dominant species. However, the abundance ratio between the first and third most abundant species in a community was significantly correlated with an independent index of species interactivity, based on the likelihood that the different parasite species in a component community co-occur in the same host individuals: the difference in abundance between the dominant and third most abundant species was greater in communities characterized by weak interactions. These findings suggest that strong interactions may lead to greater evenness in the abundance of species, and that numerical dominance is more likely to result from interspecific differences in recruitment rates.
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Navarro-Almaida, D., R. Le Gal, A. Fuente, P. Rivière-Marichalar, V. Wakelam, S. Cazaux, P. Caselli, et al. "Gas phase Elemental abundances in Molecular cloudS (GEMS)." Astronomy & Astrophysics 637 (May 2020): A39. http://dx.doi.org/10.1051/0004-6361/201937180.

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Context. Sulphur is one of the most abundant elements in the Universe. Surprisingly, sulphuretted molecules are not as abundant as expected in the interstellar medium and the identity of the main sulphur reservoir is still an open question. Aims. Our goal is to investigate the H2S chemistry in dark clouds, as this stable molecule is a potential sulphur reservoir. Methods. Using millimeter observations of CS, SO, H2S, and their isotopologues, we determine the physical conditions and H2S abundances along the cores TMC 1-C, TMC 1-CP, and Barnard 1b. The gas-grain model NAUTILUS is used to model the sulphur chemistry and explore the impact of photo-desorption and chemical desorption on the H2S abundance. Results. Our modeling shows that chemical desorption is the main source of gas-phase H2S in dark cores. The measured H2S abundance can only be fitted if we assume that the chemical desorption rate decreases by more than a factor of 10 when nH > 2 × 104. This change in the desorption rate is consistent with the formation of thick H2O and CO ice mantles on grain surfaces. The observed SO and H2S abundances are in good agreement with our predictions adopting an undepleted value of the sulphur abundance. However, the CS abundance is overestimated by a factor of 5−10. Along the three cores, atomic S is predicted to be the main sulphur reservoir. Conclusions. The gaseous H2S abundance is well reproduced, assuming undepleted sulphur abundance and chemical desorption as the main source of H2S. The behavior of the observed H2S abundance suggests a changing desorption efficiency, which would probe the snowline in these cold cores. Our model, however, highly overestimates the observed gas-phase CS abundance. Given the uncertainty in the sulphur chemistry, we can only conclude that our data are consistent with a cosmic elemental S abundance with an uncertainty of a factor of 10.
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Dissertations / Theses on the topic "Abundance"

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Steele, Matthew. "Determining Oxygen Abundance vs. Age and Iron Abundance in Halo Field Dwarfs." Bowling Green State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1120666230.

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DEMEIO, JULIAN LAWRENCE. "Abundance of rational points." Doctoral thesis, Scuola Normale Superiore, 2021. http://hdl.handle.net/11384/109444.

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For a smooth algebraic variety X defined over a number field K, one could ask several questions about the abundance of its rational points. This thesis revolves, in particular, around the following three properties: Hilbert Property, weak approximation and strong approximation. The first concerns, more or less, the question of extending the Hilbert Irreducibility Theorem to an arbitrary X (in the sense that the parameters of the Theorem are allowed to vary through rational points of this variety), the interesting case being when X is non-rational, for otherwise one recovers precisely the original theorem of Hilbert. The other two concern the question of density of rational points of X in the adelic ones (possibly with some places removed). The adjective weak" is more commonly used when talking about proper varieties, and the adjective strong" is used otherwise. In the first original work that is part of this thesis, we prove that, under a technical assumption, a proper algebraic surface X, with Zariski-dense rational points, that is endowed with two or more genus 1 fibrations, has the Hilbert Property. This result generalizes an earlier result of Corvaja and Zannier, who proved the Hilbert Property for the Fermat surface x4 + y4 = z4 + w4. The technique used is similar to theirs, the main idea being that of transporting rational points around the surface using the elliptic fibers of the various fibrations. In the second part of the thesis, we prove that on an arbitrary homogeneous space X, under some technical assumptions, the étale-Brauer-Manin obstruction is the only one to strong approximation. This obstruction is obtained by applying the more classical Brauer-Manin obstruction on all finite étale torsors over X. The proof is basically a reduction to a theorem of Borovoi and Demarche, who proved that (again under technical assumptions) strong approximation up to Brauer{Manin obstruction holds on homogeneous spaces with connected stabilizers. In this part of the thesis we also prove a compatibility result, suggested to be true by work of Cyril Demarche, between Brauer pairing and the so-called abelianization map, for homogeneous spaces of the form G=H, with H connected and linear. Finally, in the third and last part of the thesis, we explore the problem of "ramified descent", or, in other words, the question of which adelic points of X may be lifted to (a desingularization of a twist of) a fixed geometrically integral and geometrically Galois cover φ : Y --> X, with commutative geometric Galois group (although in some parts of the work this commutativity assumption is not needed). The case where the cover is unramified is already well-studied, and, therefore, the interest lies in the ramified case (whence the terminology " amified descent"). We prove that a certain naturally defined descent set" provides an obstruction to Hasse principle and weak approximation on X (the main difficulty in proving this lies in showing that rational points that lie on the branch locus of ' are unobstructed). Moreover, in analogy with the classical unramied case, we construct a subgroup B' of the Brauer group of X such that the the descent set associated to ' lies in the Brauer{Manin set associated to B'. Interestingly enough, the transcendental part of B' may provide a non-trivial obstruction, contrary to what happens in the unramified case. It seems reasonable to expect that this B' is the only obstruction to the "ramified descent" problem.
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Jonas, Seth H. "Aluminum-26 : an abundance mechanism." Honors in the Major Thesis, University of Central Florida, 2001. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/226.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.
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Stehle, Matthias. "Abundance Tomography of Type Ia Supernovae." Diss., lmu, 2004. http://nbn-resolving.de/urn:nbn:de:bvb:19-32721.

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Tsamis, Ionnis. "Heavy element abundance in ionized nebulae." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270150.

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Akerman, Christopher John. "Chemical abundance studies, near and far." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613697.

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Armstrong, David John. "On the abundance of circumbinary exoplanets." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/72676/.

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Circumbinary planets are bodies that orbit both components in a binary star system. This thesis focuses on transits of these planets, which with the aid of the Kepler space telescope have recently led to the discovery of several such objects. First, transit timing variations - departures from strict periodicity in the transit times - are studied. These arise from both the motion of the host stars and relatively rapid precession of the planet’s orbit. Limits on the maximum possible transit timing variation are derived, and tested against N-body simulations of simulated circumbinary systems. These limits are then utilised to form a search algorithm designed to find these planets in light curves, focusing on data from the WASP and Kepler observatories. This search algorithm uses an individual transit search to identify potential transit signatures, then forms periodograms allowing for the possible timing variations. It is used to identify several new candidate planets, as well as confirm detections of previously known circumbinary systems. In addition a number of interesting multiple stellar systems are identified including the as yet unexplained KIC2856960, which display multiple eclipses, significant tidal heating or rapid orbital evolution on the timescale of the 4 year Kepler observations. In 2013 unbiased stellar radii for the eclipsing binaries of the Kepler dataset were not available. A catalogue is produced, derived from spectral energy distribution fits to data from the KIS, HES and 2MASS surveys of the Kepler field, which gives temperatures for these stars accurate to ~300K. These are then used to find calibrated stellar masses and radii. These parameters, in combination with the search algorithm, are used to study circumbinary planet rates of occurrence in the Kepler dataset. The known sample of eclipsing binaries is tested for detectability, and a Monte Carlo population synthesis used to find probability density functions for these rates. These are a function of the as yet unknown circumbinary planetary inclination distribution, and show that the rate of occurrence of circumbinary planets is consistent with that of single stars if these planets are in the majority coplanar with their host binaries. However, if they are more misaligned, to a degree greater than that implied by a 5° Gaussian distribution, their rate of occurrence becomes significantly higher. Furthermore, it is confirmed that planets of Jupiter size and greater occur less often in circumbinary configurations, and that circumbinary planets are preferentially found around binaries with periods longer than ~7 days.
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Momal, Raphaëlle. "Network inference from incomplete abundance data Accounting for missing actors in interaction network inference from abundance data Tree‐based inference of species interaction networks from abundance data." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASM017.

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Les réseaux sont utilisés comme outils en microbiologie et en écologie pour représenter des relations entre espèces. Les modèles graphiques gaussiens sont le cadre mathématique dédié à l'inférence des réseaux de dépendances conditionnelles, qui permettent une séparation claires des effets directs et indirects. Cependant, les données observées sont souvent des comptages discrèts qui ne permettent pas l'utilisation de ce modèle. Cette thèse développe une méthodologie pour l'inférence de réseaux à partir de données d'abondance d'espèces. La méthode repose sur une exploration efficace et exhaustive de l'espace des arbres couvrants dans un espace latent des comptages observés, rendue possible par les propriétés algébriques de ces structures.Par ailleurs, il est probable que les comptages observés dépendent d'acteurs non mesurés (espèces ou covariable). Ce phénomène produit des arêtes supplémentaires dans le réseau marginal entre les espèces liées à l'acteur manquant dans le réseau complet, ce qui fausse la suite des analyses. Le second objectif de ce travail est de prendre en compte les acteurs manquants lors de l'inférence de réseau. Les paramètres du modèle proposé sont estimés par une approche variationnelle, qui fournit des éléments d'information pertinents à propos des données non observées
Networks are tools used to represent species relationships in microbiology and ecology. Gaussian Graphical Models provide with a mathematical framework for the inference of conditional dependency networks, which allow for a clear separation of direct and indirect effects. However observed data are often discrete counts and the inference cannot be directly performed with this model. This work develops a methodology for network inference from species observed abundances. The method relies on specific algebraic properties of spanning tree structures to perform an efficient and complete exploration of the space of spanning trees. The inference takes place in a latent space of the observed counts.Then, observed abundances are likely to depend on unmeasured actors (e.g. species or covariate). This results in spurious edges in the marginal network between the species linked to the latter in the complete network, causing inaccurate further analysis. The second objective of this work is to account for missing actors during network inference. To do so we adopt a variational approach yielding valuable insights about the missing actors
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Dockendorf, Kevin J. "Relationships between zooplankton abundance and age-0 black crappie abundance and size at three productive Florida lakes." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000523.

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McInnes, AM, DG Allan, and G. Malan. "Key sites for the conservation of waterbirds (Aves) in Durban Bay, South Africa." Durban Museum Novitates, 2005. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001003.

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Key sites for the conservation of waterbirds (Aves) in Durban Bay, South Africa. Durban Museum Novitates 30: 1-14. Forty-eight monthly counts of waterbirds were conducted in Durban Bay (July 1999-June 2003). A total of 47 227 waterbirds of 79 species were recorded. Eighteen waterbird species were significantly more abundant in summer while seven were significantly more abundant in winter. Centre Bank supported 40.6% of all waterbirds, comprising mainly Palearctic waders and roosting gulls and terns. Distinct species assemblages of plovers (Charadridae) and sandpipers (Scolopacidae) were associated with the two most selected of the intertidal sites: Bayhead and Centre Bank. The assemblage at Centre Bank included three large-bodied Palearctic species (Greenshank, Grey Plover and Whimbrel), all of which occurred in abundance there and showed strong selection for this site. The assemblage which showed strong site selection for Bayhead consisted of both resident and Palearctic species, five of which are known to favour finer sediments (Ringed and Kittlitz's plovers, Common and Terek sandpipers, and Little Stint). Bayhead had a higher number of waterbird species that occurred at higher densities, when compared with Centre Bank, and showed the highest species-diversity ranking of all sites. This may be a result of the more heterogenous nature of this area. Sporting Bodies- Pelican Island had high densities of, and strong site selection by, piscivorous species and species associated with the semi-natural shorelines of this area. This site, however, supported only 8.6% of all waterbirds counted during the study period. Fish Wharf-Yacht Basin had the highest numbers and densities of Greyheaded Gulls, which utilized this area when scavenging. Other waterbird species were poorly represented here and this site had the lowest species-diversity ranking. Commercial harbour areas were the least attractive for waterbirds in terms of species-abundance values, densities and site selection. This is largely attributed to the artificial nature of these areas. It is recommended that Centre Bank receive highest priority for conservation status within the Bay. Reasons for conserving this site include: (a) the high overall abundance of waterbirds that this site supports; (b) the unique assemblage of Palearctic waders that utilizes this area, and the overall contribution that this has to waterbird diversity in the Bay; and (c) the importance of this site to roosting gulls and terns, particularly Kelp Gull which has regionally, and potentially globally, significant numbers in this area.
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Books on the topic "Abundance"

1

Naslund, Sena Jeter. Abundance. New York: HarperCollins, 2006.

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Henley, Beth. Abundance. New York (440 Park Ave. S., New York 10016): Dramatists Play Service, 1991.

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Chapman, Robin S. Abundance. Halifax, PA, USA: Cider Press, 2009.

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Low, Shelly. Compact abundance. Montreal: Articule, 1996.

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Jin, Hailing, and Walter Gassmann, eds. RNA Abundance Analysis. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-61779-839-9.

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Borchers, D. L., S. T. Buckland, and W. Zucchini. Estimating Animal Abundance. London: Springer London, 2002. http://dx.doi.org/10.1007/978-1-4471-3708-5.

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Jin, Hailing, and Isgouhi Kaloshian, eds. RNA Abundance Analysis. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-0743-5.

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Ocana, Antonio. Santa Abundancia/ Holy Abundance. S.N., 2005.

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Rosado, Norma Iris. Abundancia Sin Limites / Abundance Without Limits. Unity House, 2001.

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Boczkowski, Pablo J. Abundance. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197565742.001.0001.

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The book examines the experience of living in a society that has more information available to the public than ever before. It focuses on the interpretations, emotions, and practices of dealing with this abundance in everyday life. Drawing upon extensive fieldwork and survey research conducted in Argentina, the book inquiries into the role of cultural and structural factors that mediate between the availability of information and the actual consequences for individuals, media, politics, and society. Providing the first book-length account of the topic in the Global South, it concludes that the experience of information abundance is tied to an overall unsettling of society, a reconstitution of how we understand and perform our relationships with others, and a twin depreciation of facts and appreciation of fictions.
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Book chapters on the topic "Abundance"

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Dewdney, A. K. "Abundance." In Hungry Hollow, 117–25. New York, NY: Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-2220-0_16.

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Mehlhorn, Heinz. "Abundance." In Encyclopedia of Parasitology, 2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-43978-4_6.

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Lucey, Cornelia, and Jolanta Burke. "Abundance." In Positive Leadership in Practice, 18–39. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003170433-2.

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Macleod, Joseph. "Abundance." In People of Florence, 40–47. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003228691-5.

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Iliescu, Sanda. "Abundance." In Experiencing Art and Architecture, 191–215. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003007654-10.

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Mehlhorn, Heinz. "Abundance." In Encyclopedia of Parasitology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-27769-6_6-2.

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Maciel, W. J. "Planetary Nebulae: Abundances and Abundance Gradients." In The Evolution of The Milky Way, 81–92. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-0938-6_8.

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Boczkowski, Pablo J. "Abundance." In Abundance, 1–26. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197565742.003.0001.

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Chapter 1 situates the contemporary focus of this book in historical perspective by summarizing the main findings from studies of previous eras that had a massive surge in the amount of information available. Moreover, it critically examines the key contributions from social and behavioral science scholarship on information overload. In addition, it further articulates the conceptual framework that is initially introduced in the preface and that constitutes the analytical apparatus of the book. It also describes the research design adopted to gather the data necessary to answer the questions posed in the preface. Finally, it provides an outline of the book.
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"Front Matter." In Abundance, [i]—[vii]. 1517 Media, 2020. http://dx.doi.org/10.2307/j.ctvp7d51g.1.

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"DONOR MENTALITY." In Abundance, 75–84. 1517 Media, 2020. http://dx.doi.org/10.2307/j.ctvp7d51g.10.

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Conference papers on the topic "Abundance"

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Houdek, G. "Asteroseismic helium abundance determination." In EQUATION-OF-STATE AND PHASE-TRANSITION ISSUES IN MODELS OF ORDINARY ASTROPHYSICAL MATTER. AIP, 2004. http://dx.doi.org/10.1063/1.1828405.

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COWAN, JOHN J., and CHRISTOPHER SNEDEN. "R-PROCESS ABUNDANCE SIGNATURES." In Proceedings of the Third International Conference. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705211_0052.

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Krippner, Wolfgang, Sebastian Bauer, and Fernando León. "Optical measurement of material abundances in mixtures incorporating preprocessing to mitigate spectral variability." In OCM 2017 - 3rd International Conference on Optical Characterization of Materials. KIT Scientific Publishing, 2017. http://dx.doi.org/10.58895/ksp/1000063696-9.

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A new optical approach for determining the abundances of substances in mixtures is presented. By using specifically designed spectral filters, it is sufficient to acquire monochrome images whose intensity quantitatively depicts the abundance of the respective material.
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Archibald, David. "The Twilight of Energy Abundance." In SPE Asia Pacific Oil & Gas Conference and Exhibition. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/171400-ms.

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Yi-Fang Chen and W. W. Chen. "Road densities and species abundance." In 2009 17th International Conference on Geoinformatics. IEEE, 2009. http://dx.doi.org/10.1109/geoinformatics.2009.5293513.

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Leone, F. "Abundance measurements in stellar environments." In SEVENTH EUROPEAN SUMMER SCHOOL ON EXPERIMENTAL NUCLEAR ASTROPHYSICS: Proceedings of the 7th European Summer School on Experimental Nuclear Astrophysics. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4875292.

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Fan, Maureen, and Kathleen Ko. "Managing icon abundance on eBay." In Extended abstracts of the 2004 conference. New York, New York, USA: ACM Press, 2004. http://dx.doi.org/10.1145/985921.986131.

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ESCHRICH, STEVEN A., and CRAIG A. BEAM. "MICROARRAY NORMALIZATION USING PROPORTIONAL ABUNDANCE." In Proceedings of the International Conference. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812702098_0001.

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Aller, L. H., and C. D. Keyes. "NGC 7027; An abundance analysis of the ionized shell." In Cosmic abundances of matter. AIP, 1989. http://dx.doi.org/10.1063/1.37977.

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Yoshimura, M. "Relic abundance of dark matter particles: new formulation and new result of abundance calculation." In Proceedings of the Third International Workshop on Particle Physics and the Early Universe. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812792129_0004.

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Reports on the topic "Abundance"

1

Bowen, Harry, and Leo Sveikauskas. Judging Factor Abundance. Cambridge, MA: National Bureau of Economic Research, August 1989. http://dx.doi.org/10.3386/w3059.

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Sachs, Jeffrey, and Andrew Warner. Natural Resource Abundance and Economic Growth. Cambridge, MA: National Bureau of Economic Research, December 1995. http://dx.doi.org/10.3386/w5398.

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Zambrano, Omar, Denisse Laos, and Marcos Robles. Global boom, local impacts: Mining revenues and subnational outcomes in Peru 2007-2011. Inter-American Development Bank, May 2014. http://dx.doi.org/10.18235/0011633.

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The relationship between the abundance of natural resources and socio-economic performance has been a main object of study in the economic development field since Adam Smith. Dominated by the verification of the so called curse of natural resource, the mainstream literature on the topic has been mostly on the study of cross sectional data at the national level, with limited empirical use of exogenous differences in the abundance of natural resources at the subnational level. We explore the case of Peru, a mining-rich middle income country where -exploiting a unique data set constructed for this purpose- we are able to assess systematic differences in district-level welfare outcomes between mining and non-mining districts. We find evidence that the condition of being mining-abundant district have a significant impact on the pace of reduction of poverty rates and inequality levels. We also estimate a heterogeneous response to the mining-abundant condition, finding stronger responses in lower-poverty, higher-inequality districts. Finally, we find a trend suggesting incremental positive marginal effects of the level of exposure to mining transfer, as proxy for the degree of abundance of mining activities, on the reduction of poverty and inequality.
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Schoening, T., and J. Greinert. Quality of image-based manganese nodule abundance assessment. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/305928.

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Bowen, Harry, Edward Leamer, and Leo Sveikauskas. Multicountry, Multifactor Tests of the Factor Abundance Theory. Cambridge, MA: National Bureau of Economic Research, May 1986. http://dx.doi.org/10.3386/w1918.

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Turner, R. J. W., R. G. Franklin, B. Taylor, M. Ceh, S E Grasby, B. Symonds, M. Adams, et al. Okanagan Basin Waterscape: water - the myth of abundance. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2006. http://dx.doi.org/10.4095/222861.

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Barlow, Jay. SWFSC Marine Mammal Abundance Data for Input into LMRIS. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada399279.

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Holden, N. E. Literature survey of isotopic abundance data for 1991--1993. Office of Scientific and Technical Information (OSTI), August 1993. http://dx.doi.org/10.2172/10102557.

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Harris, Richard B. Abundance and characteristics of snags in western Montana forests. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 1999. http://dx.doi.org/10.2737/rmrs-gtr-31.

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Mark Chynoweth, Mark Chynoweth. Using camera traps to estimate abundance of large mammals. Experiment, November 2013. http://dx.doi.org/10.18258/1610.

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