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Artykuły w czasopismach na temat „Competitive species”

Autor: Grafiati

Data publikacji: 8 czerwca 2024

Data aktualizacji: 31 lipca 2025

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1

Borgström, Pernilla, Joachim Strengbom, Maria Viketoft, and Riccardo Bommarco. "Aboveground insect herbivory increases plant competitive asymmetry, while belowground herbivory mitigates the effect." PeerJ 4 (April 4, 2016): e1867. http://dx.doi.org/10.7717/peerj.1867.

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Insect herbivores can shift the composition of a plant community, but the mechanism underlying such shifts remains largely unexplored. A possibility is that insects alter the competitive symmetry between plant species. The effect of herbivory on competition likely depends on whether the plants are subjected to aboveground or belowground herbivory or both, and also depends on soil nitrogen levels. It is unclear how these biotic and abiotic factors interactively affect competition. In a greenhouse experiment, we measured competition between two coexisting grass species that respond differently t

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2

Collins, B., and G. R. Wein. "Competition between native and immigrant Polygonum congeners." Canadian Journal of Botany 71, no. 7 (1993): 939–45. http://dx.doi.org/10.1139/b93-105.

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Coexistence of annual herbs Polygonum punctatum, a native, and Polygonum caespitosum, an immigrant, may result from (i) niche differentiation that reduces or avoids competition, (ii) competitive equivalence for shared resources, or (iii) interaction between a strong competitor and a species that tolerates competition. We investigated competitive interactions between the Polygonum congeners in a greenhouse experiment using plants grown from seed to seed set. Thinning profiles of monocultures were density dependent but did not differ between the species in monocultures. Biomass allocation to roo

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Neill, Paula E., Nicolás Rozbaczylo, Cristóbal Villaseñor-Parada, Garen Guzmán-Rendón, Sandra Sampértegui, and Cristián E. Hernández. "Patterns of association of native and exotic boring polychaetes on the southeastern Pacific coast of Chile: the combined importance of negative, positive and random interactions." PeerJ 8 (April 24, 2020): e8560. http://dx.doi.org/10.7717/peerj.8560.

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Background Studies of biological invasions focus on negative interactions between exotic and native biotas, emphasizing niche overlap between species and competitive exclusion. However, the effects of positive interactions and coexistence are poorly known. In this study we evaluate the importance of positive, negative, or random species associations in explaining the coexistence of native and exotic boring polychaetes inhabiting invertebrate hosts, on the southeastern Pacific coast of Chile. We assess three hypotheses to explain the observed patterns: positive species interactions, weak compet

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Verhoeven, Michael R., Wesley J. Glisson, and Daniel J. Larkin. "Niche Models Differentiate Potential Impacts of Two Aquatic Invasive Plant Species on Native Macrophytes." Diversity 12, no. 4 (2020): 162. http://dx.doi.org/10.3390/d12040162.

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Potamogeton crispus (curlyleaf pondweed) and Myriophyllum spicatum (Eurasian watermilfoil) are widely thought to competitively displace native macrophytes in North America. However, their perceived competitive superiority has not been comprehensively evaluated. Coexistence theory suggests that invader displacement of native species through competitive exclusion is most likely where high niche overlap results in competition for limiting resources. Thus, evaluation of niche similarity can serve as a starting point for predicting the likelihood of invaders having direct competitive impacts on res

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5

Moral, Roger del. "Competitive effects on the structure of subalpine meadow communities." Canadian Journal of Botany 63, no. 8 (1985): 1444–52. http://dx.doi.org/10.1139/b85-200.

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The effects of competition in a subalpine meadow environment were investigated by comparing within-habitat distributions and species overlap in four communities. Based on experimental studies of these communities, it was hypothesized that structural patterns should be affected by productivity changes. It was determined that such changes are nonlinear and that the most stressed and the most competitive communities share many similar properties. Among closed, relatively productive communities, mean niche width, niche width of competitively inferior species, total overlap, and overlap among weak

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Sánchez-García, Daniel, Xim Cerdá, and Elena Angulo. "Temperature or competition: Which has more influence on Mediterranean ant communities?" PLOS ONE 17, no. 4 (2022): e0267547. http://dx.doi.org/10.1371/journal.pone.0267547.

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Temperature and competition are two of the main factors determining ant community assemblages. Temperature may allow species to forage more or less efficiently throughout the day (in accordance with the maximum activity temperature of each species). Competition can be observed and quantified from species replacements occurring during resource exploitation. We studied the interspecific competitive interactions of ant communities from the Doñana Biological Reserve (southern Spain). Ants were sampled from pitfall traps and baits in three habitats with contrasted vegetation physiognomy (savin fore

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7

Vera, María Carmen, Marcos Marvá, Víctor José García-Garrido, and René Escalante. "The Beddington–DeAngelis Competitive Response: Intra-Species Interference Enhances Coexistence in Species Competition." Mathematics 12, no. 4 (2024): 562. http://dx.doi.org/10.3390/math12040562.

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Species coexistence is a major issue in ecology. We disentangled the role of individual interference when competing in the classical interference competition model. For the first time, we considered simultaneously intra- and inter-species interference by introducing the Beddington–DeAngelis competitive response into the classical competition model. We found a trade-off between intra- and inter-species interference that refines in a sense the well-known balance of intra- and inter-species competition coefficients. As a result, we found that (i) global coexistence is possible for a larger range

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Larocque, Guy R., Nancy Luckai, Shailendra N. Adhikary, Arthur Groot, F. Wayne Bell, and Mahadev Sharma. "Competition theory — science and application in mixed forest stands: review of experimental and modelling methods and suggestions for future research." Environmental Reviews 21, no. 2 (2013): 71–84. http://dx.doi.org/10.1139/er-2012-0033.

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Competition in forest stands has long been of interest to researchers. However, much of the knowledge originates from empirical studies that examined the effects of competition. For instance, many studies were focused on the effects of the presence of herbaceous species on the development of tree seedlings or the decrease in individual tree growth with increases in stand density. Several models that incorporate competitive effects have been developed to predict tree and stand growth, but with simplified representations of competitive interactions. While these studies provided guidance useful f

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9

Dungan, Michael L. "Competition and the morphology, ecology, and evolution of acorn barnacles: an experimental test." Paleobiology 11, no. 2 (1985): 165–73. http://dx.doi.org/10.1017/s0094837300011489.

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Recent ideas about the role of competition in the ecology and evolution of acorn barnacles are based partly on relationships between morphology and the outcome of competition for space. One hypothesis is that present distributions and patterns of evolutionary diversification and decline among acorn barnacles reflect the competitive exclusion and replacement of solid-walled forms by those with tubiferous skeletal structure. An alternate view is that large barnacles generally outcompete smaller ones, independent of differences in skeletal structure, with predation and disturbance favoring the ec

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10

Hasibuan, Arjun, Asep Kuswandi Supriatna, and Ema Carnia. "Mathematical Model of Iteroparous and Semelparous Species Interaction." CAUCHY: Jurnal Matematika Murni dan Aplikasi 7, no. 3 (2022): 445–63. http://dx.doi.org/10.18860/ca.v7i3.16447.

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A species can be categorized based on its reproductive strategy, including semelparous and iteroparous. Semelparous species is a species that reproduces only once in its lifetime shortly before dying, while iteroparous species is a species that reproduces in its lifetime more than once. In this paper, we examine multispecies growth dynamics involving both species categories focusing on one semelparous species and one iteroparous species influenced by density-dependent also harvesting in which there are two age classes each. We divided the study into two models comprising competitive and non-co

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11

AGUSTO, F. B., and K. O. OKOSUN. "OPTIMAL SEASONAL BIOCONTROL FOREICHHORNIA CRASSIPES." International Journal of Biomathematics 03, no. 03 (2010): 383–97. http://dx.doi.org/10.1142/s1793524510001021.

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This article studies the effect of reduction of an invasive species' competitive ability against another aggressive species, where the intra- and inter-species competition effect on the system is modeled as a control variable. Thus, following the example of competition between water hyacinth–water lettuce, where the competitive ability of the water hyacinth is reduced by the presence of the biological agent Neochetina eichhorniae (weevil) we apply optimal control to compare the effects of the weevil on the competitive relationship. With the effect of the reduced competitive ability been obviou

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Sheppard, Christine S., and Marco R. Brendel. "Competitive ability of native and alien plants: effects of residence time and invasion status." NeoBiota 65 (May 25, 2021): 47–69. http://dx.doi.org/10.3897/neobiota.65.63179.

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Competition is commonly thought to underlie the impact of plant invasions. However, competitive effects of aliens and competitive response of natives may also change over time. Indeed, as with time, the novelty of an invader decreases, the accumulated eco-evolutionary experience of resident species may eventually limit invasion success. We aimed to gain insights on whether directional changes in biotic interactions over time or more general differences between natives and aliens, for instance, resulting from an introduction bias, are relevant in determining competitive ability. We conducted a

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Sheppard, Christine S., and Marco R. Brendel. "Competitive ability of native and alien plants: effects of residence time and invasion status." NeoBiota 65 (May 25, 2021): 47–69. https://doi.org/10.3897/neobiota.65.63179.

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Competition is commonly thought to underlie the impact of plant invasions. However, competitive effects of aliens and competitive response of natives may also change over time. Indeed, as with time, the novelty of an invader decreases, the accumulated eco-evolutionary experience of resident species may eventually limit invasion success. We aimed to gain insights on whether directional changes in biotic interactions over time or more general differences between natives and aliens, for instance, resulting from an introduction bias, are relevant in determining competitive ability. We conducted a

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14

Ursell, Tristan. "Structured environments foster competitor coexistence by manipulating interspecies interfaces." PLOS Computational Biology 17, no. 1 (2021): e1007762. http://dx.doi.org/10.1371/journal.pcbi.1007762.

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Natural environments, like soils or the mammalian gut, frequently contain microbial consortia competing within a niche, wherein many species contain genetically encoded mechanisms of interspecies competition. Recent computational work suggests that physical structures in the environment can stabilize local competition between species that would otherwise be subject to competitive exclusion under isotropic conditions. Here we employ Lotka-Volterra models to show that interfacial competition localizes to physical structures, stabilizing competitive ecological networks of many species, even with

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Ursell, Tristan. "Structured environments foster competitor coexistence by manipulating interspecies interfaces." PLOS Computational Biology 17, no. 1 (2021): e1007762. http://dx.doi.org/10.1371/journal.pcbi.1007762.

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Natural environments, like soils or the mammalian gut, frequently contain microbial consortia competing within a niche, wherein many species contain genetically encoded mechanisms of interspecies competition. Recent computational work suggests that physical structures in the environment can stabilize local competition between species that would otherwise be subject to competitive exclusion under isotropic conditions. Here we employ Lotka-Volterra models to show that interfacial competition localizes to physical structures, stabilizing competitive ecological networks of many species, even with

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16

Juliano, Steven A. "Coexistence, Exclusion, or Neutrality? A Meta-Analysis of Competition between Aedes Albopictus and Resident Mosquitoes." Israel Journal of Ecology and Evolution 56, no. 3-4 (2010): 325–51. http://dx.doi.org/10.1560/ijee.55.3-4.325.

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Competition experiments estimating the relative effects of inter- and intraspecific competition can help to resolve whether interspecific competition results in coexistence or exclusion. For mosquitoes, most such experiments have focused on invasiveAedes albopictusand its interactions with residentAedes.A meta-analysis of such experiments tested whether the effect of interspecific competition is greater than, less than, or equal to that of intraspecific competition, and whether competitive outcomes are dependent on food quality. ForA. albopictusandA. aegypti, there was significant context depe

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17

Yuan, Yongge, and Junmin Li. "Effects of Parasitism on the Competitive Ability of Invasive and Native Species." Life 12, no. 11 (2022): 1800. http://dx.doi.org/10.3390/life12111800.

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Parasitic plants can often seriously harm host plants and, thus, alter competitive dominance between hosts and neighbouring species. However, whether and how parasitic plants differently affect the competitive abilities of invasive and the native plants have not been tested. In this study, we used Cuscuta grovonii as the parasitic plants and three invasive plants and three native plants as host plants. Host plants grown alone or in competition with Coix lacryma-jobi were either parasitized with Cuscuta grovonii or not parasitized. Parasitism caused similar damage to invasive and native plants

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18

Altemayer, Valérie, Bruno Vincent, Pedro Naves, François Lieutier, Géraldine Roux-Morabito, and Edmundo Sousa. "Competitive interaction between Bursaphelenchus xylophilus and the closely related species Bursaphelenchus mucronatus." Nematology 10, no. 2 (2008): 219–30. http://dx.doi.org/10.1163/156854108783476403.

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AbstractBursaphelenchus xylophilus is an invasive pest of pines. When introduced accidentally into a new geographic area, it will share the same ecological niche as the closely related indigenous species, B. mucronatus. Competition between native and introduced species may affect the spread of invasive species, so we investigated the possible competitive interaction between these two nematode species transmitted by the same insect-vector, Monochamus galloprovincialis. In order to understand how the two species interacted, we compared, under laboratory conditions, their growth on fungi and pine

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19

Broz, Amanda K., Daniel K. Manter, Ragan M. Callaway, Mark W. Paschke, and Jorge M. Vivanco. "A molecular approach to understanding plant - plant interactions in the context of invasion biology." Functional Plant Biology 35, no. 11 (2008): 1123. http://dx.doi.org/10.1071/fp08155.

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Competition is a major determinant of plant community structure, and can influence the size and reproductive fitness of a species. Therefore, competitive responses may arise from alterations in gene expression and plant function when an individual is confronted with new competitors. This study explored competition at the level of gene expression by hybridising transcripts from Centaurea maculosa Lam., one of North America’s most invasive exotic plant species, to an Arabidopsis thaliana (L.) Heynh microarray chip. Centaurea was grown in competition with Festuca idahoensis Elmer, a native specie

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20

Srivastava, Vaibhava, Eric M. Takyi, and Rana D. Parshad. "The effect of "fear" on two species competition." Mathematical Biosciences and Engineering 20, no. 5 (2023): 8814–55. http://dx.doi.org/10.3934/mbe.2023388.

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<abstract><p>Non-consumptive effects such as fear of depredation, can strongly influence predator-prey dynamics. There are several ecological and social motivations for these effects in competitive systems as well. In this work we consider the classic two species ODE and PDE Lotka-Volterra competition models, where <italic>one</italic> of the competitors is "fearful" of the other. We find that the presence of fear can have several interesting dynamical effects on the classical competitive scenarios. Notably, for fear levels in certain regimes, we show novel bi-stability

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21

Chen, Yanli, Yanping Liu, Xiaoni Liu, Zhengzhong Zhang, and Feng Zhang. "The Effects of Infectious Diseases on the Consequences of Interspecific Competition in Grassland Communities." Diversity 16, no. 4 (2024): 231. http://dx.doi.org/10.3390/d16040231.

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As infectious diseases have a severe impact on the individual survival and competitive ability of host species in grassland communities, competition between relevant species may have different consequences, potentially influencing the species composition of grassland communities and the functioning of grassland ecosystems. Understanding the impact of infectious diseases on competition is thus crucial for the health management of grassland ecosystems. How do infectious diseases affect the competitive coexistence of grassland plant species? In this study, by drawing on Tilman’s multispecies comp

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Elliott, Katherine J., and James M. Vose. "Evaluation of the Competitive Environment for White Pine (Pinus strobus L.) Seedlings Planted on Prescribed Burn Sites in the Southern Appalachians." Forest Science 41, no. 3 (1995): 513–30. http://dx.doi.org/10.1093/forestscience/41.3.513.

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Abstract We evaluated the competitive environment around planted white pine (Pinus strobus L.) seedlings and monitored the response of seedling growth to competition from naturally regenerating herbaceous and woody species for 2 yr after prescribed burning. We evaluated the ability of distance-independent and distance-dependent competition indices to predict resource availability, determined if white pine seedlings responded to resource reduction by competitors, and identified species-specific contributions to the competitive environment through canonical correspondence analysis (CCA). Distanc

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Clarke, Anthony R., and Penelope F. Measham. "Competition: A Missing Component of Fruit Fly (Diptera: Tephritidae) Risk Assessment and Planning." Insects 13, no. 11 (2022): 1065. http://dx.doi.org/10.3390/insects13111065.

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Tephritid fruit flies are internationally significant pests of horticulture. Because they are also highly invasive and of major quarantine concern, significant effort is placed in developing full or partial pest risk assessments (PRAs) for fruit flies, while large investments can be made for their control. Competition between fruit fly species, driven by the need to access and utilise fruit for larval development, has long been recognised by researchers as a fundamental component of fruit fly biology, but is entirely absent from the fruit fly PRA literature and appears not be considered in maj

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Carvalho, Saul Jorge Pinto de, and Pedro Jacob Christoffoleti. "Competition of Amaranthus species with dry bean plants." Scientia Agricola 65, no. 3 (2008): 239–45. http://dx.doi.org/10.1590/s0103-90162008000300003.

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Weeds compete with field crops mainly for water, light and nutrients, and this competition is among other factors, a function of the occurrence of weed density, and the intrinsic competitive ability of each vegetal species. The objective of this research was to evaluate the competitive ability of five weed species of the Amaranthus L. genus (A. deflexus, A. hybridus, A. retroflexus, A. spinosus and A. viridis) with dry bean plants (Phaseolus vulgaris L. - 'Carioca Precoce' cultivar), using the replacement series design. A fixed total density equivalent to 80 plants m-2 was used in pots of 2.8

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Germain, Rachel M., Margaret M. Mayfield, and Benjamin Gilbert. "The ‘filtering’ metaphor revisited: competition and environment jointly structure invasibility and coexistence." Biology Letters 14, no. 8 (2018): 20180460. http://dx.doi.org/10.1098/rsbl.2018.0460.

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‘Filtering’, or the reduction in species diversity that occurs because not all species can persist in all locations, is thought to unfold hierarchically, controlled by the environment at large scales and competition at small scales. However, the ecological effects of competition and the environment are not independent, and observational approaches preclude investigation into their interplay. We use a demographic approach with 30 plant species to experimentally test: (i) the effect of competition on species persistence in two soil moisture environments, and (ii) the effect of environmental cond

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Richter-Boix, Alex, Gustavo Llorente, and Albert Montori. "Hierarchical competition in pond-breeding anuran larvae in a Mediterranean area." Amphibia-Reptilia 28, no. 2 (2007): 247–61. http://dx.doi.org/10.1163/156853807780202549.

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AbstractThe anuran larval guild is frequently characterised by the co-occurrence, with high niche overlap, of distinct species in the same pond at variables densities during development. Anuran larvae have therefore been widely studied as a model system for competition. Body size and activity level are considered the most important factors that influence the outcome of competition between tadpoles. As species from temporary ponds normally show higher activity levels in order to achieve rapid growth and thus reduce the risk of desiccation, these species are often considered superior competitors

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Laird and Schamp. "Competitive Intransitivity Promotes Species Coexistence." American Naturalist 168, no. 2 (2006): 182. http://dx.doi.org/10.2307/3844724.

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Laird, Robert A., and Brandon S. Schamp. "Competitive Intransitivity Promotes Species Coexistence." American Naturalist 168, no. 2 (2006): 182–93. http://dx.doi.org/10.1086/506259.

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Steers, Helen L., and Paul H. Harvey. "Species patterns: Evolution's competitive edge." Current Biology 8, no. 3 (1998): R96—R98. http://dx.doi.org/10.1016/s0960-9822(98)70056-9.

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Stone, Lewi, and Alan Roberts. "Competitive exclusion, or species aggregation?" Oecologia 91, no. 3 (1992): 419–24. http://dx.doi.org/10.1007/bf00317632.

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Bernhardt, Joey R., Pavel Kratina, Aaron Louis Pereira, Manu Tamminen, Mridul K. Thomas, and Anita Narwani. "The evolution of competitive ability for essential resources." Philosophical Transactions of the Royal Society B: Biological Sciences 375, no. 1798 (2020): 20190247. http://dx.doi.org/10.1098/rstb.2019.0247.

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Competition for limiting resources is among the most fundamental ecological interactions and has long been considered a key driver of species coexistence and biodiversity. Species' minimum resource requirements, their R *s, are key traits that link individual physiological demands to the outcome of competition. However, a major question remains unanswered—to what extent are species’ competitive traits able to evolve in response to resource limitation? To address this knowledge gap, we performed an evolution experiment in which we exposed Chlamydomonas reinhardtii for approximately 285 generati

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MacInnis, Amber E., and Leon G. Higley. "Competition Among Three Forensically Important Blow Fly Species (Diptera: Calliphoridae): Phormia regina, Lucilia sericata, and Chrysomya rufifacies." Environmental Entomology 49, no. 6 (2020): 1473–79. http://dx.doi.org/10.1093/ee/nvaa120.

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Abstract Avoiding competition is thought to explain insect successional patterns on carrion, but few studies have looked at competition directly. We use replacement series experiments with three species of blow flies: Phormia regina (Meigen) (Diptera: Calliphoridae), Lucilia sericata (Meigen) (Diptera:Calliphoridae), and Chrysomya rufifacies (Macquart) (Diptera:Calliphoridae) to characterize competitive relationships. From experimental results, P. regina showed a significant competitive advantage over L. sericata. Infestation of carrion differs between L. sericata and P. regina; specifically,

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Miyamoto, Y., and T. Noda. "Effects of mussels on competitively inferior species: competitive exclusion to facilitation." Marine Ecology Progress Series 276 (2004): 293–98. http://dx.doi.org/10.3354/meps276293.

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Zhang, Quan-Guo, and Da-Yong Zhang. "Competitive hierarchies inferred from pair-wise and multi-species competition experiments." Acta Oecologica 38 (January 2012): 66–70. http://dx.doi.org/10.1016/j.actao.2011.09.005.

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Guglielmini, A. C., A. M. C. Verdú, and E. H. Satorre. "Competitive ability of five common weed species in competition with soybean." International Journal of Pest Management 63, no. 1 (2016): 30–36. http://dx.doi.org/10.1080/09670874.2016.1213459.

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Sepkoski, J. John, Frank K. McKinney, and Scott Lidgard. "Competitive displacement among post-Paleozoic cyclostome and cheilostome bryozoans." Paleobiology 26, no. 1 (2000): 7–18. http://dx.doi.org/10.1666/0094-8373(2000)026<0007:cdappc>2.0.co;2.

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Encrusting bryozoans provide one of the few systems in the fossil record in which ecological competition can be observed directly at local scales. The macroevolutionary history of diversity of cyclostome and cheilostome bryozoans is consistent with a coupled-logistic model of clade displacement predicated on species within clades interacting competitively. The model matches observed diversity history if the model is perturbed by a mass extinction with a position and magnitude analogous to the Cretaceous / Tertiary boundary event. Although it is difficult to measure all parameters in the model

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Ilic-Milosevic, Marijana, Olivera Petrovic-Obradovic, Sasa Stankovic, et al. "Estimation of the competitiveness of Ephedrus plagiator in relation to other parasitoids from the subfamily Aphidiinae." Archives of Biological Sciences 72, no. 1 (2020): 53–61. http://dx.doi.org/10.2298/abs190923066i.

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The parasitoid species Ephedrus plagiator (Nees, 1811) (Hymenoptera: Aphidiinae) is one of the most important biological agents against pest aphids. We investigated whether this species was in competition with some other aphidiine species for the same hosts. We thus examined its potential in biological programs to control aphids. We applied an unsupervised artificial neural network, a self-organizing map (SOM), which classified the competitive parasitoids into seven groups. The SOM also visualized the distributional pattern of 31 parasitoid wasps along the neural network, revealing their compe

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Aarssen, L. W., and Roy Turkington. "Competitive relations among species from pastures of different ages." Canadian Journal of Botany 63, no. 12 (1985): 2319–25. http://dx.doi.org/10.1139/b85-331.

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All possible pairs of Dactylis glomerate, Holcus lanatus, Lolium perenne, Poa compressa, and Trifolium repens were collected where the species pairs occurred in close proximity in pastures that were 2, 21, and 40 years old. Each clone was grown with its natural neighbouring clone in experimental field plots for a period of 1 year. Differences in competitive relations between two species from pastures of different ages were measured by total mixture yield and component yield quotient, i.e., the yield quotient of the lowest and highest yielding components. Results show that the relative competit

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Burton, Philip J. "Some limitations inherent to static indices of plant competition." Canadian Journal of Forest Research 23, no. 10 (1993): 2141–52. http://dx.doi.org/10.1139/x93-267.

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Various measurements of the abundance, proximity, and stature of neighbouring plants are utilized as indices of competitive intensity experienced by crop trees. These indices can be useful in assessing the desirability of vegetation control and stand thinnings, and in simulating stand development. Static competition indices, however, have fundamental limitations which should be more widely considered. Competition is usually a constraint to growth, not a determinant of growth, so any measurement of competition alone is fundamentally limited in its ability to predict individual crop tree perform

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Hasegawa, Koh, and Koji Maekawa. "Role of visual barriers on mitigation of interspecific interference competition between native and non-native salmonid species." Canadian Journal of Zoology 87, no. 9 (2009): 781–86. http://dx.doi.org/10.1139/z09-071.

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Interspecific competition is a mechanism by which native salmonids can be replaced by non-native species. According to the two-species Lotka–Volterra competition model, replacement of the native species would occur when the non-native species has a competitive advantage over the native species and interspecific competition is more intense than competition within each of the two species. However, field observations have implied that visual barriers such as woody debris may slow down the replacement by mitigating interspecific competition. Using an experimental stream with white-spotted charr (

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Keddy, Paul A. "Effects of competition from shrubs on herbaceous wetland plants: a 4-year field experiment." Canadian Journal of Botany 67, no. 3 (1989): 708–16. http://dx.doi.org/10.1139/b89-094.

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While competition is known to occur among some species in some plant communities, we are not yet able to predict in which environments, or among which species, competitive interactions will be most intense. The objective of this study was to test for competition in a wetland plant community and then to determine which environments and which species were influenced by competition. The study site was the transition zone between shrubs and herbaceous plants on a lakeshore. To test for competitive release, shrubs were removed from treatment plots paired with controls in 25 sections of shoreline an

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Hodge, Rachel A., and Erika A. Bach. "Mechanisms of Germline Stem Cell Competition across Species." Life 14, no. 10 (2024): 1251. http://dx.doi.org/10.3390/life14101251.

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In this review, we introduce the concept of cell competition, which occurs between heterogeneous neighboring cell populations. Cells with higher relative fitness become “winners” that outcompete cells of lower relative fitness (“losers”). We discuss the idea of super-competitors, mutant cells that expand at the expense of wild-type cells. Work on adult stem cells (ASCs) has revealed principles of neutral competition, wherein ASCs can be stochastically lost and replaced, and of biased competition, in which a winning ASC with a competitive advantage replaces its neighbors. Germline stem cells (G

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Hart, Simon P., Martin M. Turcotte, and Jonathan M. Levine. "Effects of rapid evolution on species coexistence." Proceedings of the National Academy of Sciences 116, no. 6 (2019): 2112–17. http://dx.doi.org/10.1073/pnas.1816298116.

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Increasing evidence for rapid evolution suggests that the maintenance of species diversity in ecological communities may be influenced by more than purely ecological processes. Classic theory shows that interspecific competition may select for traits that increase niche differentiation, weakening competition and thus promoting species coexistence. While empirical work has demonstrated trait evolution in response to competition, if and how evolution affects the dynamics of the competing species—the key step for completing the required eco-evolutionary feedback—has been difficult to resolve. Her

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Martignoni, Maria M., Miranda M. Hart, Rebecca C. Tyson, and Jimmy Garnier. "Diversity within mutualist guilds promotes coexistence and reduces the risk of invasion from an alien mutualist." Proceedings of the Royal Society B: Biological Sciences 287, no. 1923 (2020): 20192312. http://dx.doi.org/10.1098/rspb.2019.2312.

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Biodiversity is an important component of healthy ecosystems, and thus understanding the mechanisms behind species coexistence is critical in ecology and conservation biology. In particular, few studies have focused on the dynamics resulting from the co-occurrence of mutualistic and competitive interactions within a group of species. Here we build a mathematical model to study the dynamics of a guild of competitors who are also engaged in mutualistic interactions with a common partner. We show that coexistence as well as competitive exclusion can occur depending on the competition strength and

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FANARA, Juan J., Marcos IMBERTI, and Nicolas J. LAVAGNINO. "Interspecific competition between the invasive species Zaprionus indianus and two Drosophila species (Diptera: Drosophilidae) in their natural hosts." Revista de la Sociedad Entomológica Argentina 83, no. 3 (2024): 42–46. https://doi.org/10.25085/rsea.830308.

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The history of biodiversity is closely related to the history of the evolution of species interactions. Diversity can be reduced by competitive exclusion in species with similar ecology that live in the same spatial region. Zaprionus indianus Gupta is a pest species that has colonized the American continent in the last 20 years. The expansion of this species in Argentina can generate competition, a major event of the ecology of insect communities exploiting ephemeral and fragmented resources. Zaprionus indianus has shown an overlapping in the breeding and feeding resources and in the distribut

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Canham, Charles D., Philip T. LePage, and K. Dave Coates. "A neighborhood analysis of canopy tree competition: effects of shading versus crowding." Canadian Journal of Forest Research 34, no. 4 (2004): 778–87. http://dx.doi.org/10.1139/x03-232.

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We have developed extensions of traditional distance-dependent, spatial competition analyses that estimate the magnitude of the competitive effects of neighboring trees on target tree growth as a function of the species, size, and distance to neighboring trees. Our analyses also estimate inter- and intra-specific competition coefficients and explicitly partition the competitive effects of neighbors into the effects of shading versus crowding. We tested the method using data from forests of northern, interior British Columbia dominated by western hemlock (Tsuga heterophylla (Raf.) Sarg.) and we

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BA, Idy, Papa Ibrahima NDIAYE, Mahe Ndao, and AboubaKary Diakhaby. "An Extension of Two Species Lotka-Volterra Competition Model." Biomath Communications 8, no. 2 (2021): 90. http://dx.doi.org/10.11145/bmc.2021.12.171.

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Limiting resource is a angular stone of the interactions between species in ecosystems such as competition, prey-predators and food chain systems. In this paper, we propose a planar system as an extension of Lotka-Voterra competition model. This describes? two competitive species for a single resource? which are affected by intra and inter-specific interference. We give its complete analysis for the existence and local stability of all equlibria and some conditions of global stability. The model exhibits a rich set of behaviors with a multiplicity of coexistence equilibria, bi-stability, tri-s

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GALON, LEANDRO, RICARDO TREVISOL, CESAR TIAGO FORTE, SIUMAR PEDRO TIRONI, FRANCISCO WILSON REICHERT JÚNIOR, and ANDRÉ LUIZ RADUNZ. "COMPETITIVE ABILITY OF BEAN CULTIVARS WITH HAIRY BEGGARTICKS." Revista Caatinga 30, no. 4 (2017): 855–65. http://dx.doi.org/10.1590/1983-21252017v30n405rc.

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ABSTRACT Weed interference is a factor that limits the productivity of beans and, among these, hairy beggarticks is one of the main species competing with the crop for environmental resources. Thus, the aim of this study is to evaluate the competitive ability of black bean cultivars (BRS Campeiro, IPR Uirapuru, SCS204 Predileto and BRS Supremo) in the presence of a biotype of hairy beggarticks. The experimental design is a completely randomized block with four replications. Treatments were arranged in a replacement series, consisting of a proportion of the crop and the hairy beggarticks: 100:0

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Xue, Wei, Lin Huang, and Fei-Hai Yu. "Importance of starting points in heterogeneous environments: interactions between two clonal plants with contrasting spatial architectures." Journal of Plant Ecology 13, no. 3 (2020): 323–30. http://dx.doi.org/10.1093/jpe/rtaa018.

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Abstract Aims Plants can benefit from heterogeneous environments via disproportionately increasing resource harvesting in resource-rich patches. Their initial growing positions with respect to resource patches may thus have important influences on their performance and relative competitive ability. Such impacts may differ between species with contrasting spatial architectures. However, the potential influence of initial growing positions in heterogeneous environment on plant growth and competition has largely been ignored. Methods We grew the phalanx plant Carex neurocarpa and the guerrilla pl

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Stanley, Steven M. "Predation defeats competition on the seafloor." Paleobiology 34, no. 1 (2008): 1–21. http://dx.doi.org/10.1666/07026.1.

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… the snail, whose tender horns being hit Shrinks backward in his shelly cave with pain, And there, all smothered up, in shade doth sit, Long after fearing to creep forth again….— William Shakespeare, Venus and Adonis (1593)For many decades, ecology textbooks presented classical competition theory without reservation. The central principle here is that two species sharing an essential resource that is in limited supply cannot coexist for long because the competitively superior species will eliminate the other one. The implication is that ecological communities should be characterized by divisi

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