Niche differentiation - wikipedia Niche differentiation The term niche differentiation ( synonymous with niche segregation, niche separation and niche partitioning ), as it applies to the field of ecology, refers to the process by which competing species use the environment differently in a way that helps them to coexist. The competitive exclusion principle states that if two species with identical niches ( i.e., ecological roles ) compete, then one will inevitably drive the other to extinction. When two species differentiate their niches, they tend to compete less strongly, and are thus more likely to coexist. Species can differentiate their niches in many ways, such as by consuming different foods, or using different parts of the environment. As an example of niche partitioning, several Anolis lizards in the Caribbean islands share common food needs -- mainly insects. They avoid competition by occupying different physical locations. For example, some live on the leaf litter floor while others live on branches. Species who live in different areas compete less for food and other resources, which minimizes competition between species. However, species who live in similar areas compete strongly. Contents 1 Detection and quantification 2 Development 2.1 Current competition ( The Ghost of Competition Present ) 2.2 Via past extinctions ( The Ghost of Competition Past ) 2.3 Evolving differences 3 Types 3.1 Resource partitioning 3.2 Predator partitioning 3.3 Conditional differentiation 3.4 Competition - predation trade - off 4 Coexistence without niche differentiation : exceptions to the rule 5 See also 6 References 7 Further reading 8 External links Detection and quantification The Lotka - Volterra equation states that two competing species can coexist when intra-specific ( within species ) competition is greater than inter-specific ( between species ) competition ( Armstrong and McGehee 1981 ). Since niche differentiation concentrates competition within - species, due to a decrease in between - species competition, the Lotka - Volterra model predicts that niche differentiation of any degree will result in coexistence. In reality, this still leaves the question of how much differentiation is needed for coexistence ( Hutchinson 1959 ). A vague answer to this question is that the more similar two species are, the more finely balanced the suitability of their environment must be in order to allow coexistence. There are limits to the amount of niche differentiation required for coexistence, and this can vary with the type of resource, the nature of the environment, and the amount of variation both within and between the species. To answer questions about niche differentiation, it is necessary for ecologists to be able to detect, measure, and quantify the niches of different coexisting and competing species. This is often done through a combination of detailed natural history studies, controlled experiments ( to determine the strength of competition ), and mathematical models ( Strong 1982, Leibold 1995 ). To understand the mechanisms of niche differentiation and competition, much data must be gathered on how the two species interact, how they use their resources, and the type of ecosystem in which they exist, among other factors. In addition, several mathematical models exist to quantify niche breadth, competition, and coexistence ( Bastolla et al. 2005 ). However, regardless of methods used, niches and competition can be distinctly difficult to measure quantitatively, and this makes detection and demonstration of niche differentiation difficult and complex. Development Over time, two competing species can either coexist, through niche differentiation or other means, or compete until one species becomes locally extinct. Several theories exist for how niche differentiation arises or evolves given these two possible outcomes. Current competition ( the ghost of competition present ) Niche differentiation can arise from current competition. For instance, species X has a fundamental niche of the entire slope of a hillside, but its realized niche is only the top portion of the slope because species Y, which is a better competitor but can not survive on the top portion of the slope, has excluded it from the lower portion of the slope. With this scenario, competition will continue indefinitely in the middle of the slope between these two species. Because of this, detection of the presence of niche differentiation ( through competition ) will be relatively easy. It is also important to remember that there is no evolutionary change of the individual species in this case ; rather this is an ecological effect of species Y out - competing species X within the bounds of species Y 's fundamental niche. Via past extinctions ( the ghost of competition past ) Another way by which niche differentiation can arise is via the previous elimination of species without realized niches. This asserts that at some point in the past, several species inhabited an area, and all of these species had overlapping fundamental niches. However, through competitive exclusion, the less competitive species were eliminated, leaving only the species that were able to coexist ( i.e. the most competitive species whose realized niches did not overlap ). Again, this process does not include any evolutionary change of individual species, but it is merely the product of the competitive exclusion principle. Also, because no species is out - competing any other species in the final community, the presence of niche differentiation will be difficult or impossible to detect. Evolving differences Finally, niche differentiation can arise as an evolutionary effect of competition. In this case, two competing species will evolve different patterns of resource use so as to avoid competition. Here too, current competition is absent or low, and therefore detection of niche differentiation is difficult or impossible. Types Below is a list of ways that species can partition their niche. This list is not exhaustive, but illustrates several classic examples. Resource partitioning When species use different resources, this can help them to coexist. For example, some lizard species appear to coexist because they consume insects of differing sizes. Alternatively, species can coexist on the same resources if each species is limited by different resources, or differently able to capture resources. For example, different types of phytoplankton can coexist when different species are differently limited by nitrogen, phosphorus, silicon, and light. In the Galapagos Islands, finches with small beaks are more able to consume small seeds, and finches with large beaks are more able to consume large seeds. If a species ' density declines, then the food it most depends on will become more abundant ( since there are so few individuals to consume it ). As a result, the remaining individuals will experience less competition for food. Although `` resource '' generally refers to food, species can partition other non-consumable objects, such as parts of the habitat. For example, warblers are thought to coexist because they nest in different parts of trees. Species can also partition habitat in a way that gives them access to different types of resources. As stated in the introduction, anolis lizards appear to coexist because each uses different parts of the forests as perch locations. This likely gives them access to different species of insects. Predator partitioning Predator partitioning occurs when species are attacked differently by different predators ( or natural enemies more generally ). For example, trees could differentiate their niche if they are consumed by different species of specialist herbivores, such as herbivorous insects. If a species density declines, so too will the density of its natural enemies, giving it an advantage. Thus, if each species is constrained by different natural enemies, they will be able to coexist. Early work focused on specialist predators ; however, more recent studies have shown that predators do not need to be pure specialists, they simply need to affect each prey species differently. The Janzen -- Connell hypothesis represents a form of predator partitioning. Conditional differentiation Conditional differentiation ( sometimes called temporal niche partitioning ) occurs when species differ in their competitive abilities based on varying environmental conditions. For example, in the Sonoran Desert, some annual plants are more successful during wet years, while others are more successful during dry years. As a result, each species will have an advantage in some years, but not others. When environmental conditions are most favorable, individuals will tend to compete most strongly with member of the same species. For example, in a dry year, dry - adapted plants will tend to be most limited by other dry - adapted plants. This can help them to coexist through a storage effect. Competition - predation trade - off Species can differentiate their niche via a competition - predation trade - off if one species is a better competitor when predators are absent, and the other is better when predators are present. Defenses against predators, such as toxic compounds or hard shells, are often metabolically costly. As a result, species that produce such defenses are often poor competitors when predators are absent. Species can coexist through a competition - predation trade - off if predators are more abundant when the less defended species is common, and less abundant if the well - defended species is common. This effect has been criticized as being weak, because theoretical models suggest that only two species within a community can coexist because of this mechanism. Coexistence without niche differentiation : exceptions to the rule Some competing species have been shown to coexist on the same resource with no observable evidence of niche differentiation and in `` violation '' of the competitive exclusion principle. One instance is in a group of hispine beetle species ( Strong 1982 ). These beetle species, which eat the same food and occupy the same habitat, coexist without any evidence of segregation or exclusion. The beetles show no aggression either intra - or inter-specifically. Coexistence may be possible through a combination of non-limiting food and habitat resources and high rates of predation and parasitism, though this has not been demonstrated. This example illustrates that the evidence for niche differentiation is by no means universal. Niche differentiation is also not the only means by which coexistence is possible between two competing species ( see Shmida and Ellner 1984 ). However, niche differentiation is a critically important ecological idea which explains species coexistence, thus promoting the high biodiversity often seen in many of the world 's biomes. Research using mathematical modelling is indeed demonstrating that predation can indeed stabilize lumps of very similar species. Willow warbler and chiffchaff and other very similar warblers can serve as an example. The idea is that it is also a good strategy to be very similar to a successful species or have enough dissimilarity. Also trees in the rain forest can serve as an example of all high canopy species basically following the same strategy. Other examples of nearly identical species clusters occupying the same niche were water beetles, prairie birds and algae. The basic idea is that there can be clusters of very similar species all applying the same successful strategy and between them open spaces. Here the species cluster takes the place of a single species in the classical ecological models. See also Phylogenetic niche conservatism References Jump up ^ Hardin, Garrett ( 29 April 1960 ). `` The Competitive Exclusion Principle ''. Science. 131 ( 3409 ) : 1292 -- 1297. PMID 14399717. doi : 10.1126 / science. 131.3409. 1292. ^ Jump up to : Pacala, Stephen W. ; Roughgarden, Jonathan ( February 1985 ). `` Population Experiments with the Anolis Lizards of St. Maarten and St. Eustatius ''. Ecology. 66 ( 1 ) : 129 -- 141. doi : 10.2307 / 1941313. Jump up ^ Caldwell, Janalee P ; Vitt, Laurie J ( 1999 ). `` Dietary asymmetry in leaf litter frogs and lizards in a transitional northern Amazonian rain forest ''. Oikos. 84 ( 3 ) : 383 -- 397. doi : 10.2307 / 3546419. Jump up ^ Grover, James P. ( 1997 ). Resource competition ( 1st ed. ). London : Chapman & Hall. ISBN 0412749300. Jump up ^ MacArthur, Robert H. ( October 1958 ). `` Population Ecology of Some Warblers of Northeastern Coniferous Forests ''. Ecology. 39 ( 4 ) : 599 -- 619. doi : 10.2307 / 1931600. ^ Jump up to : Grover, James ( 1994 ). `` Assembly Rules for Communities of Nutrient - Limited Plants and Specialist Herbivores ''. The American Naturalist. 143 ( 2 ) : 258 -- 282. doi : 10.2307 / 2462643. Jump up ^ Chesson, Peter ; Kuang, Jessica J. ( 13 November 2008 ). `` The interaction between predation and competition ''. Nature. 456 ( 7219 ) : 235 -- 238. PMID 19005554. doi : 10.1038 / nature07248. Jump up ^ Sedio, Brian E. ; Ostling, Annette M. ; Ris Lambers, Janneke Hille ( August 2013 ). `` How specialised must natural enemies be to facilitate coexistence among plants ? ''. Ecology Letters. 16 ( 8 ) : 995 -- 1003. doi : 10.1111 / ele. 12130. Jump up ^ Gilbert, Gregory ( 2005 ). Burlesem, David ; Pinard, Michelle ; Hartley, Sue, eds. Biotic interactions in the tropics : their role in the maintenance of species diversity. Cambridge, UK : Cambridge University Press. pp. 141 -- 164. ISBN 9780521609852. ^ Jump up to : Angert, Amy L. ; Huxman, Travis E. ; Chesson, Peter ; Venable, D. Lawrence ( 14 July 2009 ). `` Functional tradeoffs determine species coexistence via the storage effect ''. Proceedings of the National Academy of Sciences. 106 ( 28 ) : 11641 -- 11645. PMC 2710622. PMID 19571002. doi : 10.1073 / pnas. 0904512106. Jump up ^ Holt, Robert D. ; Grover, James ; Tilman, David ( November 1994 ). `` Simple Rules for Interspecific Dominance in Systems with Exploitative and Apparent Competition ''. The American Naturalist. 144 ( 5 ) : 741 -- 771. doi : 10.1086 / 285705. Jump up ^ Chase, Jonathan M. ; Abrams, Peter A. ; Grover, James P. ; Diehl, Sebastian ; Chesson, Peter ; Holt, Robert D. ; Richards, Shane A. ; Nisbet, Roger M. ; Case, Ted J. ( March 2002 ). `` The interaction between predation and competition : a review and synthesis ''. Ecology Letters. 5 ( 2 ) : 302 -- 315. doi : 10.1046 / j. 1461 - 0248.2002. 00315. x. Jump up ^ Scheffer, M, Nes, E, Self - organized similarity, the evolutionary emergence of groups of similar species Proceedings of the National Academy of Sciences, April 18, 2006 vol. 103 no. 16 6230 - 6235 Further reading Armstrong, R.A., McGehee, R. ( 1980 ). `` Competitive exclusion ''. American Naturalist. 115 ( 2 ) : 151 -- 170. doi : 10.1086 / 283553. CS1 maint : Multiple names : authors list ( link ) Bastolla, U., Lässig, M., Manrubia, S.C., Valleriani, A. ( August 2005 ). `` Biodiversity in model ecosystems, I : coexistence conditions for competing species ''. J. Theor. Biol. 235 ( 4 ) : 521 -- 30. PMID 15935170. doi : 10.1016 / j. jtbi. 2005.02. 005. CS1 maint : Multiple names : authors list ( link ) Hutchinson, G.E. ( 1959 ). `` Homage to Santa Rosalia or Why are there so many kinds of animals ? ''. American Naturalist. 93 ( 870 ) : 145 -- 159. doi : 10.1086 / 282070. Kronfeld - Schor, N., Dayan, T. ( 1999 ). `` The dietary basis for temporal partitioning : food habits of coexisting Acomys species ''. Oecologia. 121 : 123 -- 8. doi : 10.1007 / s004420050913. CS1 maint : Multiple names : authors list ( link ) Lawler, S.P., Morin, P.J. ( 1993 ). `` Temporal overlap, competition, and priority effects in larval anurans ''. Ecology. 74 ( 1 ) : 174 -- 182. JSTOR 1939512. doi : 10.2307 / 1939512. CS1 maint : Multiple names : authors list ( link ) Leibold, M.A. ( 1995 ). `` The niche concept revisited : mechanistic models and community context ''. Ecology. 76 ( 5 ) : 1371 -- 82. JSTOR 1938141. doi : 10.2307 / 1938141. Pyke, G.H. ( 1982 ). `` Local geographic distributions of bumblebees near Crested Butte, Colorado : competition and community structure ''. Ecology. 63 ( 2 ) : 555 -- 573. JSTOR 1938970. doi : 10.2307 / 1938970. Shmida, A., Ellner, S. ( 1984 ). `` Coexistence of plant species with similar niches ''. Vegetatio. 58 : 29 -- 55. CS1 maint : Multiple names : authors list ( link ) Strong, D.R.J. ( 1982 ). `` Harmonious coexistence of hispine beetles on Heliconia in experimental and natural communities ''. Ecology. 63 ( 4 ) : 1039 -- 49. JSTOR 1937243. doi : 10.2307 / 1937243. Tilman, D. ( 1990 ). `` Mechanisms of plant competition for nutrients : the elements of a predictive theory of competition ''. In Grace, J.B. ; Tilman, D. Perspectives on Plant Competition. New York : Academic Press. pp. 117 -- 141. External links More information on resource partitioning Walter, G.H. ( May 1991 ). `` What is resource partitioning ? ''. J. Theor. Biol. 150 ( 2 ) : 137 -- 43. PMID 1890851. doi : 10.1016 / S0022 - 5193 ( 05 ) 80327 - 3. Department of Entomology, University of Queensland, Australia. Ecology : Modelling ecosystems : Trophic components General Abiotic component Abiotic stress Behaviour Biogeochemical cycle Biomass Biotic component Biotic stress Carrying capacity Competition Ecosystem Ecosystem ecology Ecosystem model Keystone species List of feeding behaviours Metabolic theory of ecology Productivity Resource Producers Autotrophs Chemosynthesis Chemotrophs Foundation species Mixotrophs Myco - heterotrophy Mycotroph Organotrophs Photoheterotrophs Photosynthesis Photosynthetic efficiency Phototrophs Primary nutritional groups Primary production Consumers Apex predator Bacterivore Carnivores Chemoorganotroph Foraging Generalist and specialist species Intraguild predation Herbivores Heterotroph Heterotrophic nutrition Insectivore Mesopredators Mesopredator release hypothesis Omnivores Optimal foraging theory Predation Prey switching Decomposers Chemoorganoheterotrophy Decomposition Detritivores Detritus Microorganisms Archaea Bacteriophage Environmental microbiology Lithoautotroph Lithotrophy Microbial cooperation Microbial ecology Microbial food web Microbial intelligence Microbial loop Microbial mat Microbial metabolism Phage ecology Food webs Biomagnification Ecological efficiency Ecological pyramid Energy flow Food chain Trophic level Example webs Cold seeps Hydrothermal vents Intertidal Kelp forests Lakes North Pacific Subtropical Gyre Rivers San Francisco Estuary Soil Tide pool Processes Ascendency Bioaccumulation Cascade effect Climax community Competitive exclusion principle Consumer - resource systems Copiotrophs Dominance Ecological network Ecological succession Energy quality Energy Systems Language f - ratio Feed conversion ratio Feeding frenzy Mesotrophic soil Nutrient cycle Oligotroph Paradox of the plankton Trophic cascade Trophic mutualism Trophic state index Defense / counter Animal coloration Antipredator adaptations Camouflage Deimatic behaviour Herbivore adaptations to plant defense Mimicry Plant defense against herbivory Predator avoidance in schooling fish Ecology : Modelling ecosystems : Other components Population ecology Abundance Allee effect Depensation Ecological yield Effective population size Intraspecific competition Logistic function Malthusian growth model Maximum sustainable yield Overpopulation in wild animals Overexploitation Population cycle Population dynamics Population modeling Population size Predator -- prey ( Lotka -- Volterra ) equations Recruitment Resilience Small population size Stability Species Biodiversity Density - dependent inhibition Ecological effects of biodiversity Ecological extinction Endemic species Flagship species Gradient analysis Indicator species Introduced species Invasive species Latitudinal gradients in species diversity Minimum viable population Neutral theory Occupancy -- abundance relationship Population viability analysis Priority effect Rapoport 's rule Relative abundance distribution Relative species abundance Species diversity Species homogeneity Species richness Species distribution Species - area curve Umbrella species Species interaction Antibiosis Biological interaction Commensalism Community ecology Ecological facilitation Interspecific competition Mutualism Storage effect Spatial ecology Biogeography Cross-boundary subsidy Ecocline Ecotone Ecotype Disturbance Edge effects Foster 's rule Habitat fragmentation Ideal free distribution Intermediate Disturbance Hypothesis Island biogeography Landscape ecology Landscape epidemiology Landscape limnology Metapopulation Patch dynamics r / K selection theory Source -- sink dynamics Niche Ecological niche Ecological trap Ecosystem engineer Environmental niche modelling Guild Habitat Marine habitats Limiting similarity Niche apportionment models Niche construction Niche differentiation Other networks Assembly rules Bateman 's principle Bioluminescence Ecological collapse Ecological debt Ecological deficit Ecological energetics Ecological indicator Ecological threshold Ecosystem diversity Emergence Extinction debt Kleiber 's law Liebig 's law of the minimum Marginal value theorem Thorson 's rule Xerosere Other Allometry Alternative stable state Balance of nature Biological data visualization Constructal theory Ecocline Ecological economics Ecological footprint Ecological forecasting Ecological humanities Ecological stoichiometry Ecopath Ecosystem based fisheries Endolith Evolutionary ecology Functional ecology Industrial ecology Macroecology Microecosystem Natural environment Regime shift Systems ecology Urban ecology Theoretical ecology List of ecology topics Retrieved from `` https://en.wikipedia.org/w/index.php?title=Niche_differentiation&oldid=805658990 '' Categories : Ecological niche Hidden categories : CS1 maint : Multiple names : authors list Talk Contents About Wikipedia Català Ελληνικά Français Português Edit links This page was last edited on 16 October 2017, at 20 : 30. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: states that two species cannot coexist in the same niche indefinitely
Answer: competitive exclusion principle