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Legg til artikkelen på andre språk" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-0" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">Legg til språk</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> <div class="after-portlet after-portlet-lang"><span class="uls-after-portlet-link"></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namnerom"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Den_ordovikisk-siluriske_masseutryddinga" title="Vis innhaldssida [c]" accesskey="c"><span>Artikkel</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Diskusjon:Den_ordovikisk-siluriske_masseutryddinga&action=edit&redlink=1" rel="discussion" class="new" title="Diskusjon om innhaldssida (sida finst ikkje) [t]" accesskey="t"><span>Diskusjon</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Endre språkvariant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button 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Husk å ta med alle detaljene ovenfor.</div></div><hr /> <p>Du kan sjå og kopiere kjeldekoden til denne sida. </p><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="nn" dir="ltr" name="wpTextbox1">'''Den ordovikisk-siluriske masseutryddinga''' var den tredje største av fem store [[masseutrydding]]ar i [[jorda]] si historie ut frå kor mange prosent av slektene som døydde ut. == Historie == Utyddinga skjedde ved grensa mellom periodane [[ordovicium]] og [[silur]] og markerer grensa mellom desse to. Under hendinga var det fleire markante endringar på biologisk reaktive [[isotop]]ar av [[karbon]] og [[oksygen]] og denne kompleksiteten indikerer at det var fleire hendingar som kom tett etter kvarandre, eller ei enkel hending med fleire fasar. På denne tida levde dei mest avanserte [[fleircella organisme|fleircella organismane]] i havet og rundt 100 slekter døydde ut, eller om lag 49&nbsp; % av alle slektene som var til.<ref>{{artikkelkjelde|forfattar=Rohde & Muller|utgjeve=2005|tittel=Cycles in Fossil Diversity|publikasjon=Nature|bind =434|side =208–210|doi=10.1038/nature03339|nummer=7030}}</ref> [[Armføtingar]] og [[mosdyr]] vart kraftig redusert, samt mange [[trilobittar]], [[konodontar]] og [[graptolittar]]. == Mogelege årsaker == Desse utryddingane vert for tida forska på, men teorien som har mest støtte er at han vart utløyst av ei langvarig [[istid]], kanskje den mest alvorlege istida i heile [[fanerozoikum]]. Før hendinga vart eit fall i [[karbondioksid]] i atmosfæren, som så selektivt påverka dei grunne havområda der dei fleste organismane heldt til. Under ei istid vert mykje vatn i verdshava butte opp i isen, så havnivået under istida fall og fjerna mange økologiske nisjar. Havnivået auka så truleg igjen, før det nok ein gong trekte seg tilbake og tok fleire liv. Det kaldare klimaet førte til sterkare djuphavsstraumar og førte oksygen med seg til djuphavet. Det utvikla seg eit dyreliv nede i djupet, men det forsvann raskt då djuphavet igjen vart oksygenfattig. Dei overlevande artane var dei som takla endringane og fylte dei tomme økologiske nisjene som dei utdøydde dyra etterlet. === Gammaglimt-hypotesen === Enkelte forskarar har føreslått at den første utryddinga kan ha kome av eit [[gammaglimt]] frå ei [[hypernova|eksploderande stjerne]] 6000 lysår frå jorda. Eit slikt glimt på berre 10 sekund ville ha fjerna heile [[ozonlaget]] på jorda og utsett organismane ved overflata for [[UV-stråling]], som ville ha teke livet av mange artar og ført til eit fall i temperaturen.<ref>{{kjelde www |url=http://www.nasa.gov/vision/universe/starsgalaxies/gammaray_extinction.html |tittel=Explosions in Space May Have Initiated Ancient Extinction on Earth |vitja =21. august 2008 |forfattar = Wanjek |first=Christopher |coauthors= |dato =April 6, 2005 |utgjevar = |forlag =NASA}}</ref><ref>{{kjelde www |url=http://news.bbc.co.uk/1/hi/sci/tech/4433963.stm |tittel=Ray burst is extinction suspect |vitja =21. august 2008|forlag =BBC}}</ref> Sjølv om det ikkje er usannsynleg er det ingen andre spor som tyder på at ei slik hending faktisk har skjedd. == Slutten på hendinga == Den andre episoden enda då smeltande isbrear fekk havet til å stige og stabilisere seg att. Dette førte til nytt biologisk mangfald hos dei overlevande rekkene. == Sjå òg == * [[Perm-trias-hendinga]] * [[Krit-tertiær-hendinga]] == Kjelder == <div class="references-small"> * ''Denne artikkelen bygger på «[[:en:Ordovician–Silurian extinction events|Ordovician–Silurian extinction events]]» frå {{Wikipedia-utgåve|en}}, den 21. august 2008.'' ** ''{{Wikipedia-utgåve|en}} oppgav desse kjeldene: ** [[Cesare Emiliani|Emiliani, Cesare]]. (1992). ''Planet Earth : Cosmology, Geology, & the Evolution of Life & the Environment''. Cambridge University Press. 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