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class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Population dynamics model characterized by sharp booms and busts</div> <p><b>Irruptive growth</b> is a growth pattern over time, defined by a sudden rapid growth in the population of an organism. Irruptive growth is studied in <a href="/wiki/Population_ecology" title="Population ecology">population ecology</a>.<sup id="cite_ref-White2007_1-0" class="reference"><a href="#cite_note-White2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Population_cycle" title="Population cycle">Population cycles</a> often display irruptive growth, but with a predictable pattern of subsequent decline.<sup id="cite_ref-Boutin1995_2-0" class="reference"><a href="#cite_note-Boutin1995-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> It is a phenomenon typically associated with <a href="/wiki/R/K_selection_theory" title="R/K selection theory">r-strategists</a>. </p><p>Irruptive growth occurs when a species reproduces rapidly. It is especially common in large herbivores, such as pronghorn or elk (red deer), which have high fecundity and delayed density-dependent effects on <a href="/wiki/Recruitment_(biology)" title="Recruitment (biology)">recruitment</a>. All populations show <a href="/wiki/Logistic_function" title="Logistic function">logistic growth</a>, but in species which exhibit irruptive growth this is especially rapid. Populations of some species initially show a lack of response to density-dependent factors that limit population size as it nears the <a href="/wiki/Carrying_capacity" title="Carrying capacity">carrying capacity</a> of the <a href="/wiki/Environment_(biophysical)" class="mw-redirect" title="Environment (biophysical)">environment</a>. The exhibition of irruptive growth is dependent on a number of elements including resource availability, degree of both interspecific and intraspecific competition, and strength of <a href="/wiki/Predator-prey" class="mw-redirect" title="Predator-prey">predator-prey</a> relationships. In <a href="/wiki/Ecosystem" title="Ecosystem">ecosystems</a> with more than one species feeding on a certain resource, the populations of certain species can irrupt in non-predictable ways depending upon the complex feedback mechanisms caused by competition. A species population may sometimes irrupt when predators are removed, or when favourable weather causes food supplies to rapidly increase.<sup id="cite_ref-White2007_1-1" class="reference"><a href="#cite_note-White2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Similar to white-tailed deer in North America, roe deer in Europe have shown similar <a href="/wiki/Fecundity" title="Fecundity">fecundity</a> even as the population density doubles three or four times. The deer are able to irrupt because the species is able to double its population yearly and populations show delayed response to density-dependent factors, in other words -the females remain just as fertile despite having lower body weights and other characteristics affiliated with <a href="/wiki/Overpopulation" title="Overpopulation">overpopulation</a>.<sup id="cite_ref-Andersen2000_3-0" class="reference"><a href="#cite_note-Andersen2000-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Irruptive growth patterns are also seen in mammal herbivores with a relatively small body size, or such creatures in Arctic ecosystems which are subject to <a href="/wiki/Population_cycle" title="Population cycle">population cycles</a>. In cases where a single herbivore prey species is dominant in an ecosystem, there is likely to be a strong link with predator species which serves to control the population (see <a href="/wiki/Lotka%E2%80%93Volterra_equations" title="Lotka–Volterra equations">Lotka–Volterra equations</a>). The populations of rabbits and house mice introduced Australia show irruptive growth, for example. A possible reason may be that after drought ends, they reproduce at a rapid rate while predator reproduction is still seasonal in occurrence. This allows for the population to explode and to be limited more by a return of dry conditions than by predators.<sup id="cite_ref-Boutin1995_2-1" class="reference"><a href="#cite_note-Boutin1995-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Invasive_species" title="Invasive species">Invasive species</a> which can reproduce rapidly may show this pattern of growth because when a new area is being colonized predator species are often not present to limit growth, and there is little intraspecific and/or interspecific competition in early settlement of a location which means there is abundant resource availability. </p> <div class="mw-heading mw-heading2"><h2 id="K-strategist_and_r-strategist_species">K-strategist and r-strategist species</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Irruptive_growth&action=edit&section=1" title="Edit section: K-strategist and r-strategist species"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/R/K_selection_theory" title="R/K selection theory">r/K selection theory</a></div> <p>Species that are r-strategist (species that evolve according to r-selection) are characterized by rapid development, early reproduction, small body size, and shorter lifespans, whereas <a href="/wiki/R/K_selection_theory" title="R/K selection theory">K-strategist</a> species (species that evolve according to K-selection) exhibit slow development, delayed reproduction, large body size, and longer lifespans.<sup id="cite_ref-Vandermeer_4-0" class="reference"><a href="#cite_note-Vandermeer-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Species that are r-strategist are more likely to exhibit irruptive growth than K-strategist species. r-selection leads to high productivity, while K-selection leads to high efficiency. Productivity refers to the number of offspring produced, whereas efficiency refers to the probability of survival of individual offspring.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (November 2020)">citation needed</span></a></i>]</sup> </p><p>The <a href="/wiki/Human" title="Human">human species</a> is K-strategist; that is, each mating pair has a small number of offspring, of which the majority will survive to adulthood and reach reproductive age. r-strategist species, such as some <a href="/wiki/Insect" title="Insect">insects</a> and most plants, have very large numbers of offspring, the majority of which will die before reaching physical maturity. If there is a change in their environment, more of these offspring may survive than is typical, leading to irruptive growth. Because K-strategist species have less offspring they are less likely to exhibit irruptive growth.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (November 2020)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Irruptive_growth&action=edit&section=2" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Population_growth" title="Population growth">Population growth</a></li> <li><a href="/wiki/Ecological_overshoot" title="Ecological overshoot">Ecological overshoot</a></li> <li><a href="/wiki/Population_planning" class="mw-redirect" title="Population planning">Population planning</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Irruptive_growth&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-White2007-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-White2007_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-White2007_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFWhiteBruggemanRobert_A.2007" class="citation journal cs1">White, P. J.; Bruggeman, Jason E.; Robert A., Garrott (2007). "Irruptive population dynamics in Yellowstone pronghorn". <i>Ecological Applications</i>. <b>17</b> (6): 1598–1606. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1890%2F06-2032.1">10.1890/06-2032.1</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/17913126">17913126</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Ecological+Applications&rft.atitle=Irruptive+population+dynamics+in+Yellowstone+pronghorn&rft.volume=17&rft.issue=6&rft.pages=1598-1606&rft.date=2007&rft_id=info%3Adoi%2F10.1890%2F06-2032.1&rft_id=info%3Apmid%2F17913126&rft.aulast=White&rft.aufirst=P.+J.&rft.au=Bruggeman%2C+Jason+E.&rft.au=Robert+A.%2C+Garrott&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIrruptive+growth" class="Z3988"></span></span> </li> <li id="cite_note-Boutin1995-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-Boutin1995_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Boutin1995_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBoutin1995" class="citation journal cs1">Boutin, Stan (1995). "Testing predator-prey theory by studying fluctuating populations of small mammals". <i>Wildlife Research</i>. <b>22</b> (1): 89–100. <a href="/wiki/CiteSeerX_(identifier)" class="mw-redirect" title="CiteSeerX (identifier)">CiteSeerX</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.6975">10.1.1.575.6975</a></span>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1071%2FWR9950089">10.1071/WR9950089</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Wildlife+Research&rft.atitle=Testing+predator-prey+theory+by+studying+fluctuating+populations+of+small+mammals&rft.volume=22&rft.issue=1&rft.pages=89-100&rft.date=1995&rft_id=https%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fsummary%3Fdoi%3D10.1.1.575.6975%23id-name%3DCiteSeerX&rft_id=info%3Adoi%2F10.1071%2FWR9950089&rft.aulast=Boutin&rft.aufirst=Stan&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIrruptive+growth" class="Z3988"></span></span> </li> <li id="cite_note-Andersen2000-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Andersen2000_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAndersenLinnell2000" class="citation journal cs1">Andersen, Reidar; Linnell, John D. C. (2000). <a rel="nofollow" class="external text" href="https://www.researchgate.net/publication/229194908">"Irruptive potential in roe deer: Density-dependent effects on body mass and fertility"</a>. <i>The Journal of Wildlife Management</i>. <b>64</b> (3): 698–706. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.2307%2F3802739">10.2307/3802739</a>. <a href="/wiki/JSTOR_(identifier)" class="mw-redirect" title="JSTOR (identifier)">JSTOR</a> <a rel="nofollow" class="external text" href="https://www.jstor.org/stable/3802739">3802739</a><span class="reference-accessdate">. Retrieved <span class="nowrap">17 November</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Journal+of+Wildlife+Management&rft.atitle=Irruptive+potential+in+roe+deer%3A+Density-dependent+effects+on+body+mass+and+fertility&rft.volume=64&rft.issue=3&rft.pages=698-706&rft.date=2000&rft_id=info%3Adoi%2F10.2307%2F3802739&rft_id=https%3A%2F%2Fwww.jstor.org%2Fstable%2F3802739%23id-name%3DJSTOR&rft.aulast=Andersen&rft.aufirst=Reidar&rft.au=Linnell%2C+John+D.+C.&rft_id=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F229194908&rfr_id=info%3Asid%2Fen.wikipedia.org%3AIrruptive+growth" class="Z3988"></span></span> </li> <li id="cite_note-Vandermeer-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-Vandermeer_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVandermeerGoldberg2003" class="citation book cs1">Vandermeer, John H.; Goldberg, Deborah E. 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