Thèses sur le sujet « Competitive species »
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Roney, Hillary Christine. « Competitive Exclusion of Cyanobacterial Species in the Great Salt Lake ». Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2476.pdf.
Texte intégralMorghan, Kimberly Jo Reever. « Competitive interactions between native grasses and invasive species in California grasslands / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Texte intégralRoss, Pamela. « Caesium-137 uptake in two grass species and the effects of competitive ions ». Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389595.
Texte intégralICENHOUR, CRYSTAL RENEE PERRY. « EXPERIMENTAL EVIDENCE FOR COMPETITIVE COEXISTENCE OF TWO SPECIES OF PNEUMOCYSTIS WITHIN RAT LUNGS ». University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1012244966.
Texte intégralThomas, Heather M. « Competitive Interactions Between a Native and Exotic Trout Species in High Mountain Streams ». DigitalCommons@USU, 1996. https://digitalcommons.usu.edu/etd/5264.
Texte intégralPohl, Angelika [Verfasser], et Niels [Akademischer Betreuer] Dingemanse. « An analysis of competitive traits in pest ant species / Angelika Pohl ; Betreuer : Niels Dingemanse ». München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1198111844/34.
Texte intégralSchwartz, Lauren Michele. « The competitive response of Panicum virgatum cultivars to non-native invasive species in southern Illinois ». OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/765.
Texte intégralNielsen, Kristin Norma Astrid Toftgaard. « Predicting competitive ability from plant traits : A comparative study of 63 terrestrial herbaceous plant species ». Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10227.
Texte intégralKiger, Sarah. « Competitive ability of native and non-native prairie species in response to soil nitrogen and density ». Connect to resource, 2006. http://hdl.handle.net/1811/6621.
Texte intégralTitle from first page of PDF file. Document formatted into pages: contains 21 p.; also includes graphics. Includes bibliographical references (p. 12-13). Available online via Ohio State University's Knowledge Bank.
Long, Michael A. « Tree species composition and oak competitive status in upland hardwood stands approaching mid-rotation in southern Illinois / ». Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1404346481&sid=1&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Texte intégralMkango, Sara. « Multi-species models of Antarctic krill predators : do competitive effects influence estimates of pre-exploitation whale abundance and recovery ? » Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/4911.
Texte intégralMany species of baleen whales and seals in the Southern Hemisphere were subject to intensive overexploitation by commercial harvesting in the last two centuries, and many populations were reduced to very low levels. Krill is the dominant prey item of these species. Harvesting (to near extinction) of the large baleen whales (blue, humpback and fin whales) from the start of the 20th century led to a likely increase in the availability of krill to other krill predators such as the Antarctic minke whales and crabeater seals. This phenomenon is referred to as the “krill surplus” hypothesis and has been a central hypothesis of Antarctic ecosystem studies. This thesis aims to better understand species interactions in the Antarctic through developing and extending multispecies models of the system. The study considered only Region A (IWC Management Areas II, III and IV, 60°W to 130°E) because the numbers of baleen whales harvested in Atlantic/Indian Oceans were far greater than in other Oceans, so that the impacts on the dynamics of these species are likely greater. The simple models of competition between blue and fin whales developed give qualitatively similar results to the Mori-Butterworth Antarctic ecosystem model of an initial number of fin whales before exploitation began that is much lower than single species models suggest. However, there are important features of blue and fin whale CPUE data off Durban over the middle decades of the last century that are not reflected by the model results, and a number of possible reasons for this are advanced. In particular, the introduction of competition in the models predicts a steady fin whale population until 1950, but cannot reproduce the feature in the CPUE data of an increase from the 1920’s to 1950’s. The study then extends the Mori-Butterworth Antarctic ecosystem model by adding squid, which has fast dynamics compared to whales and seals. The model estimates population trends in terms of numbers or biomass. This study indicates that results are particularly sensitive to the density dependence assumed for natural mortality and/or birth rate. The results highlight that the squid biomass trajectory is relatively insensitive to initial squid abundance but depends strongly on the density dependence assumed for squid. Generally, the estimated historical trajectories suggest that the inclusion of squid in the model hardly impacts the maxima reached by other species that benefited from the krill surplus. The model predicts that squid started to increase at about the same time (1920) that the reduction of large baleen whales (blue, humpback and fin whales) commenced under heavy harvesting. This suggests that species with fast dynamics such as squid were possibly the first to benefit from krill surplus, even before minke whales and crabeater seals, which started to increase only about a decade later. The study provides a potential framework for understanding the interplay between species with slow and fast dynamics.
Poland, Therese M. « Competitive interactions between the spruce beetle, Dendroctonus rufipennis, Kirby, and two secondary species, Ips tridens, Mannerheim, and Dryocoetes affaber, Mannerheim, (Coleoptera : Scolytidae) ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24341.pdf.
Texte intégralVERSACE, Soraya. « Influence of climatic variations and competitive interactions on the productivity of mountain forests in Italy ». Doctoral thesis, Università degli studi del Molise, 2020. http://hdl.handle.net/11695/97766.
Texte intégralTree growth is influenced by multiple factors including, climate and competition processes. Climate change has a strong impact on growth of trees and can cause negative impacts on forests, especially in the Mediterranean basin. However, tree growth can also be influenced by competitive interactions, through the use and absorption of resources within tree communities. To quantify the level of competition between trees, competition indices are used, which are normally computed over small areas. Predicting competitive interactions over larger areas can be very important and light detection and ranging (lidar) data, could be the suitable tool. Based on these considerations, the main objective of the thesis was to identify and study the influence of climatic variations and competitive interactions on the growth of three important forest species, European beech (Fagus sylvatica L.), Norway spruce (Picea abies L.) and silver fir (Abies alba Mill.). The work is structured into three chapters, in which the first analyzes the influence of climate and extreme events on the radial growth of beech and silver fir in mixed and pure plots along a latitudinal gradient in Italy. In the second chapter the competitive interactions in mixed and pure populations of European beech and silver fir, located at the limits of their distribution range (southern Italy) are analyzed. In the third chapter, instead, was to estimate the competition dynamics for individual trees of Norway spruce and silver fir, located in the municipality of Lavarone (Trentino), and to identify the relationship between competitive interactions and tree aboveground biomass. Overall, results highlighted the response of trees under to climate and competition processes in mountain forests in Italy. In particular, the results of the first work showed a different response only at the regional level for the maximum temperatures. In Trentino the temperatures in winter, for silver fir, and summer, for both species, had a lesser negative impact on radial growth of trees compared to southern sites. Despite this, the results obtained from the correlations (radial growth-drought indices) and from principal component analysis have shown that no plot was sensitive to summer drought. Results are important to implement operational techniques that increase species adaptation to climate change. In the second work showed that the basal area increment, under the negative influence of high competition levels and slope terrains, varied between stands. In this sense, higher competitive interactions have been observed in Molise than in Calabria. Finally, in the third work showed that lidar metrics could be used to predict the competition indices of individual trees. In addition, biomass was observed to decrease as competition increased. The results of the three works showed that for the choice of sustainable forestry options it is necessary to consider the conditions of the site where these species are found and the structure of the forest stands, in terms of density and arrangement of the trees. Furthermore, it has been found that the use of remote sensing techniques (e.g. lidar) can be very useful in the forestry field, since they can provide information on larger areas.
Winslow, Christopher J. « Competitive interactions between young-of-the-year smallmouth bass (Micropterus Dolomieu) and round goby (Apollonia melanostomus) ». Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1288625667.
Texte intégralWalker, Emer Ann [Verfasser], Johannes [Akademischer Betreuer] Kollmann et Karl F. [Akademischer Betreuer] Auerswald. « It’s a matter of source : The competitive effects of dominant species on calcareous grassland forbs / Emer Ann Walker. Gutachter : Johannes Kollmann ; Karl F. Auerswald. Betreuer : Johannes Kollmann ». München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1064075509/34.
Texte intégralOfficer, Andrew Russell. « Powdery Mildew (Erysiphe cruciferarum) Affects the Allelopathic and Competitive Abilities of Invasive Garlic Mustard (Alliaria petiolata) ». Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1363272398.
Texte intégralLaube, Julia Verfasser], Annette [Akademischer Betreuer] Menzel, Tim H. [Akademischer Betreuer] Sparks et Susanne S. [Akademischer Betreuer] [Renner. « Performance of native and invasive plant species under climate change – phenology, competitive ability and stress tolerance / Julia Laube. Gutachter : Annette Menzel ; Tim H. Sparks ; Susanne S. Renner. Betreuer : Annette Menzel ». München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1075317274/34.
Texte intégralWendelberger, Kristie Susan. « Evaluating plant community response to sea level rise and anthropogenic drying : Can life stage and competitive ability be used as indicators in guiding conservation actions ? » FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2558.
Texte intégralPark-Dwyer, Sarah Evelyn. « Modelling competition in two-species mixtures ». Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323340.
Texte intégralJanse, Van Vuuren Adriaan. « Niche Occupation in Biological Species Competition ». Thesis, Stellenbosch : University of Stellenbosch, 2008. http://hdl.handle.net/10019.1/2932.
Texte intégralThe primary question considered in this study is whether a small population of a biological species introduced into a resource-heterogeneous environment, where it competes for these resources with an already established native species, will be able to invade successfully. A two-component autonomous system of reaction-diffusion equations with spatially inhomogeneous Lotka-Volterra competitive reaction terms and diffusion coefficients is derived as the governing equations of the competitive scenario. The model parameters for which the introduced species is able to invade describe the realized niche of that species. A linear stability analysis is performed for the model in the case where the resource heterogeneity is represented by, and the diffusion coefficients are, two-toned functions. In the case where the native species is not directly affected by the resource heterogeneity, necessary and sufficient conditions for successful invasion are derived. In the case where the native species is directly affected by the resource heterogeneity only sufficient conditions for successful invasion are derived. The reaction-diffusion equations employed in the model are deterministic. However, in reality biological species are subject to stochastic population perturbations. It is argued that the ability of the invading species to recover from a population perturbation is correlated with the persistence of the species in the niche that it occupies. Hence, invasion time is used as a relative measure to quantify the rate at which a species’ population distribution recovers from perturbation. Moreover, finite difference and spectral difference methods are employed to solve the model scenarios numerically and to corroborate the results of the linear stability analysis. Finally, a case study is performed. The model is instantiated with parameters that represent two different cultivars of barley in a hypothetical environment characterized by spatially varying water availability and the sufficient conditions for successful invasion are verified for this hypothetical scenario.
Janse, van Vuuren Adriaan. « Niche occupation in biological species competition / ». Link to the online version, 2008. http://hdl.handle.net/10019/753.
Texte intégralCeliker, Hasan. « Competition between species can drive public-goods cooperation within a species ». Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/70790.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references (p. 40-43).
Costly cooperative strategies are vulnerable to exploitation by cheats. Microbial studies have suggested that cooperation can be maintained in nature by mechanisms such as reciprocity, spatial structure and multi-level selection. So far, however, almost all laboratory experiments aimed at understanding cooperation have relied on studying a single species in isolation. In contrast, species in the wild live within complex communities where they interact with other species. Little effort has focused on understanding the effect of interspecies competition on the evolution of cooperation within a species. We test this relationship by using sucrose metabolism of budding yeast as a model cooperative system. We find that when co-cultured with a bacterial competitor, yeast populations become more cooperative compared to isolated populations. We show that this increase in cooperation within yeast is mainly driven by resource competition imposed by the bacterial competitor. A similar increase in cooperation is observed i
by Hasan Celiker.
S.M.
Carlsson, Linnéa. « Stable Coexistence of Three Species in Competition ». Thesis, Linköping University, Department of Mathematics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18807.
Texte intégralThis report consider a system describing three competing species with populations x, y and z. Sufficient conditions for every positive equilibrium to be asymptotically stable have been found. First it is shown that conditions on the pairwise competitive interaction between the populations are needed. Actually, these conditions are equivalent to asymptotic stability for any two-dimensional competing system of the three species. It is also shown that these alone are not enough, and that a condition on the competitive interaction between all three populations is also needed. If all conditions are fulfilled, each population will survive on a long-term basis and there will be a stable coexistence.
Rasheed, Shaker M. « A reaction-diffusion model for inter-species competition and intra-species cooperation ». Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13545/.
Texte intégralNguyen, Tung Shen Wenxian Hetzer Georg. « A-stability for two species competition diffusion systems ». Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Dissertations/NGUYEN_TUNG_28.pdf.
Texte intégralFisher, E. M. « Competition for food in the Bryozoa ». Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279719.
Texte intégralIdjadi, Joshua Aziz. « Aggregation promotes species coexistence among reef-building corals ». Access to citation, abstract and download form provided by ProQuest Information and Learning Company ; downloadable PDF file, 96 p, 2008. http://proquest.umi.com/pqdweb?did=1609283431&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texte intégralVan, der Hoff Q., JC Greeff et TH Fay. « Defining a stability boundary for three species competition models ». Elsevier, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001763.
Texte intégralFlower, Tom P. (Thomas Patrick). « Competition for food in meerkats (Suricata suricatta) ». Diss., University of Pretoria, 2009. http://hdl.handle.net/2263/25367.
Texte intégralDissertation (MSc)--University of Pretoria, 2011.
Zoology and Entomology
unrestricted
Fay, TH, et JC Greeff. « A three species competition model as a decision support tool ». Elsevier, 2007. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000167.
Texte intégralBezuglyy, Andriy. « Reaction-diffusion-advection models for single and multiple species ». The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253646281.
Texte intégralMinor, Rebecca. « Competition for Conifer Cones as a Potential Mechanism of Endangerment for the Mount Graham Red Squirrel ». Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/193441.
Texte intégralTillett, David McIlvain. « Lipid productivity and species competition in laboratory models of algal mass cultures ». Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/10274.
Texte intégralMills, Catherine. « Competition between specialist and generalist species in computational and experimental model ecosystems ». Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25502.
Texte intégralDerbridge, Jonathan, et Jonathan Derbridge. « Ecology and Conservation of Endangered Territorial Species Under Invasion ». Diss., The University of Arizona, 2018. http://hdl.handle.net/10150/626655.
Texte intégralAbdollahian-Noghabi, Mohammad. « Ecophysiology of sugar beet cultivars and weed species subjected to water deficiency stress ». Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299308.
Texte intégralBuyukates, Yesim. « Characterization of the plankton community in the lower Rincon Delta : Investigations regarding new approaches to management ». Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1312.
Texte intégralAlvarez, Aguirre Maria Guadalupe. « Effects of interspecific competition and herbivory on an exotic species, Senecio inaequidens DC ». Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498646.
Texte intégralHarrison, Emma Clare. « The Pararge species of Madeira : an examination of the role of interspecific competition ». Thesis, Manchester Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343456.
Texte intégralBliss, Kristin Mays. « Impact of nutrient heterogeneity on plant response and competition in Coastal plain species ». Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29755.
Texte intégralPh. D.
Averill, Isabel E. « The Effect of Intermediate Advection on Two Competing Species ». The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1324056383.
Texte intégralCosta, Zacharia. « SPECIES LEVEL DIFFERENCES IN THE ECOLOGY OF TWO NEOTROPICAL TADPOLE SPECIES : RESPONSES TO NONLETHAL PREDATORS AND THE ROLES OF COMPETITION AND RESOURCE USE ». VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2635.
Texte intégralBrunkalla, Roberta Joann. « Influence of Mixing and Buoyancy on Competition Between Cyanobacteria Species in Upper Klamath Lake ». PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3998.
Texte intégralForsman, J. (Jukka). « Heterospecific attraction in breeding bird communities:implications to habitat selection and species interactions in a landscape perspective ». Doctoral thesis, Oulun yliopisto, 2000. http://urn.fi/urn:isbn:9514256263.
Texte intégralSchwartz, Lauren Michele. « A comparative study of the population dynamics of four Amaranthaceae species ». OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1087.
Texte intégralCosta, Sofia Conde. « Antagonistic interactions between dominant invasive and native ant species in citrus orchards ». Master's thesis, ISA, 2017. http://hdl.handle.net/10400.5/14836.
Texte intégralThe Argentine ant, Linepithema humile (Mayr) established in the South of Portugal (Algarve), about 120 years ago. Zina et al. (2017) compared the composition of ant communities foraging in tree canopy in citrus orchards among the three ecological subregions of Algarve (Litoral, Barrocal and Serra) and observed that the invasive dominant species L. humile was absent from Serra. In this work, we tested the hypothesis that dominant native ant species, such as Tapinoma nigerrimum (Nylander) and Lasius grandis Forel could prevent the Argentine ant from invading Serra. Laboratory experiments were carried out, using both Petri dish arenas and cages to assess the antagonistic interactions between the Argentine ant and two dominant native species, at the individual and colony level, respectively. Overall, our results support the tested hypothesis. At the individual level, both T. nigerrimum and L. grandis showed higher aggression and survival levels than Argentine ant. At the colony level, the results suggest that both the Argentine ant and T. nigerrimum were able to recruit a relative large number of individuals from the colony when trying to colonise a food resource defended by the competitor species. In our experimental conditions, T. nigerrimum showed to be more efficient than Argentine ant in this type of competition, as it was able to defend a food resource in four out of five times from the attack of the former species, as well as to dominate a resource defended by Argentine ant in four out of five times
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Story, Heather Marie. « Assessing performance and compatibility of three Laricobius species as predators of hemlock woolly adelgid, Adelges tsugae ». Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42362.
Texte intégralMaster of Science in Life Sciences
Van, Acker Rene C. « Multiple-weed species interference in broadleaved crops : evaluation of yield loss prediction and competition models ». Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308562.
Texte intégralZarochentseva, O. « Adaptation of methodology calculation relative crowding coefficient for evaluation competition of tree species in polyculture ». Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/26816.
Texte intégralEverard, Katherine Anne. « Soil Moisture as a Mediator for Nitrogen Competition : Implications for Species Invasion and Climate Change ». Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/4651.
Texte intégral