{"id":6140,"date":"2026-10-19T09:48:33","date_gmt":"2026-10-19T09:48:33","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-liffraedi-ragnhildur-gudmundsdottir\/"},"modified":"2026-10-19T09:48:33","modified_gmt":"2026-10-19T09:48:33","slug":"doktorsvorn-i-liffraedi-ragnhildur-gudmundsdottir","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-liffraedi-ragnhildur-gudmundsdottir\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed l\u00edffr\u00e6\u00f0i &#8211; Ragnhildur Gu\u00f0mundsd\u00f3ttir"},"content":{"rendered":"<div class=\"field-items\">\n<div class=\"field-item even\" property=\"content:encoded\">\n<p>Streymi:<a href=\"https:\/\/www.youtube.com\/user\/HIvarp\/live\">https:\/\/www.youtube.com\/user\/HIvarp\/live<\/a><\/p>\n<p><strong>Doktorsefni:<\/strong>\u00a0Ragnhildur Gu\u00f0mundsd\u00f3ttir<\/p>\n<p><strong>Heiti ritger\u00f0ar:<\/strong>\u00a0\u00d6rverur og grunnvatnsmarfl\u00f3in Crangonyx islandicus \u00ed lindaruppsprettum \u00e1 \u00cdslandi (Microbes and the groundwater amphipod Crangonyx islandicus in spring sources in Iceland)<\/p>\n<p><strong>Andm\u00e6lendur:<\/strong> Dr. Owen S. Wangensteen, v\u00edsindama\u00f0ur vi\u00f0 H\u00e1sk\u00f3lann \u00ed Troms\u00f8, Noregi<br \/> Dr. Oddur Vilhelmsson, pr\u00f3fessor vi\u00f0 Au\u00f0lindadeild H\u00e1sk\u00f3lans \u00e1 Akureyri<\/p>\n<p><strong>Lei\u00f0beinandi:<\/strong>\u00a0Dr. Sn\u00e6bj\u00f6rn P\u00e1lsson, pr\u00f3fessor vi\u00f0 L\u00edf- og umhverfisv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n<p><strong>Einnig \u00ed doktorsnefnd<\/strong> <br \/> Dr. Bjarni Krist\u00f3fer Kristj\u00e1nsson, pr\u00f3fessor vi\u00f0 Fiskeldis- og fiskal\u00edffr\u00e6\u00f0ideild H\u00e1sk\u00f3lans \u00e1 H\u00f3lum <br \/> Dr. Vigg\u00f3 \u00de\u00f3r Marteinsson, pr\u00f3fessor vi\u00f0 Matv\u00e6la- og n\u00e6ringarfr\u00e6\u00f0ideild H\u00e1sk\u00f3la \u00cdslands og faglegur lei\u00f0togi hj\u00e1 Mat\u00eds<\/p>\n<p><strong>Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0 Dr. Anna D\u00f3ra S\u00e6\u00fe\u00f3rsd\u00f3ttir, pr\u00f3fessor og deildarforseti L\u00edf- og umhverfisv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n<p><strong>\u00c1grip<\/strong><\/p>\n<p>\u00cdslandsmarfl\u00f3in, Crangonyx islandicus, er grunnvatnsmarfl\u00f3artegund sem finnst eing\u00f6ngu \u00e1 \u00cdslandi. Erf\u00f0aranns\u00f3knir hafa s\u00fdnt a\u00f0 h\u00fan hefur a\u00f0greinst h\u00e9r \u00e1 landi \u00ed um 4,8 millj\u00f3nir \u00e1ra sem bendir til \u00feess a\u00f0 h\u00fan hafi lifa\u00f0 af undir \u00edsaldarj\u00f6kli en \u00e1 \u00feessu t\u00edmabili hefur \u00cdsland endurteki\u00f0 veri\u00f0 \u00feaki\u00f0 j\u00f6klum. L\u00edklega hefur tegundin veri\u00f0 \u00e1 \u00cdslandi allt fr\u00e1 \u00fev\u00ed a\u00f0 forveri \u00cdslands var\u00f0 a\u00f0 eyju, \u00feegar landbr\u00fain til Gr\u00e6nlands rofna\u00f0i fyrir um 15 millj\u00f3num \u00e1ra. N\u00faverandi \u00feekkt \u00fatbrei\u00f0sla tegundarinnar er \u00ed grunnvatni hraunalinda \u00e1 flekaskilum landsins. \u00deessar lindir eru eins konar n\u00e1tt\u00farulegur gluggi inn \u00ed grunnvatnskerfi\u00f0 en \u00fear m\u00e1 finna vistkerfi \u00e1 m\u00f3tum grunnvatns, yfirbor\u00f0svatns og yfirliggjandi jar\u00f0vegs. \u00cd \u00feessari ritger\u00f0 er \u00f6rverusamf\u00e9lag \u00feessa sv\u00e6\u00f0is og marfl\u00f3nna sko\u00f0a\u00f0, b\u00e6\u00f0i til a\u00f0 kanna frekara l\u00edf \u00ed \u00feessu l\u00edtt \u00feekkta kerfi og til a\u00f0 sko\u00f0a \u00fe\u00e1 ferla sem hafa m\u00f3ta\u00f0 samf\u00e9l\u00f6gin. Ni\u00f0urst\u00f6\u00f0urnar benda til \u00feess a\u00f0 \u00e1 marfl\u00f3num finnist nokkrar tegundir af bifd\u00fdrum og bakter\u00edum sem ekki finnast \u00ed uppsprettunum nema a\u00f0 litlu leyti. B\u00e6\u00f0i slembiferlar og umhverfis\u00fe\u00e6ttir reyndust st\u00fdra tegundasamsetningunni fyrir \u00f6rveruh\u00f3pana \u00ed uppsprettunum. \u00de\u00e6ttir eins og s\u00fdrustig, hitastig, tilvist fiska og landfr\u00e6\u00f0ileg sta\u00f0setning m\u00f3tu\u00f0u bakter\u00edusamf\u00e9l\u00f6gin \u00e1 me\u00f0an hitastig og far r\u00e9\u00f0u mestu um samsetningu bifd\u00fdrasamf\u00e9laganna. Me\u00f0al bakter\u00edanna var a\u00f0 finna \u00fdmsa efnatill\u00edfandi h\u00f3pa sem bendir til \u00feess a\u00f0 frumframlei\u00f0ni \u00e1 s\u00e9r sta\u00f0 \u00ed grunnvatnskerfinu. \u00dea\u00f0 g\u00e6ti \u00fev\u00ed m\u00f6gulega \u00fatsk\u00fdrt hvernig marfl\u00e6rnar g\u00e1tu lifa\u00f0 af j\u00f6kulskei\u00f0 \u00ed grunnvatni landsins.<\/p>\n<p><strong>Um doktorsefni\u00f0<\/strong><\/p>\n<p>Ragnhildur Gu\u00f0mundsd\u00f3ttir er f\u00e6dd \u00ed Reykjav\u00edk \u00e1ri\u00f0 1982. H\u00fan lauk st\u00fadentspr\u00f3fi fr\u00e1 Menntask\u00f3lanum vi\u00f0 Hamrahl\u00ed\u00f0 \u00e1ri\u00f0 2002 og BSc-pr\u00f3fi \u00ed l\u00edffr\u00e6\u00f0i fr\u00e1 H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2005. Eftir BSc-pr\u00f3f starfa\u00f0i Ragnhildur vi\u00f0 \u00e1turanns\u00f3knir \u00e1 Hafranns\u00f3knarstofnun \u00e1\u00f0ur en h\u00fan h\u00f3f svo meistaran\u00e1m \u00ed sj\u00e1varvistfr\u00e6\u00f0i vi\u00f0 H\u00e1sk\u00f3lann \u00ed Troms\u00f8 \u00ed Noregi og vi\u00f0 H\u00e1sk\u00f3lasetri\u00f0 \u00e1 Svalbar\u00f0a (UNIS), sem lauk me\u00f0 MSc-gr\u00e1\u00f0u \u00ed n\u00f3vember 2008. Ragnhildur lauk vi\u00f0b\u00f3tardipl\u00f3mu \u00ed kennslufr\u00e6\u00f0um og starfa\u00f0i vi\u00f0 kennslu n\u00e1tt\u00farufr\u00e6\u00f0igreina vi\u00f0 Verzlunarsk\u00f3la \u00cdslands. Ragnhildur h\u00f3f vinnu vi\u00f0 doktorsverkefni sitt \u00e1ri\u00f0 2013.<\/p>\n<p>Me\u00f0fram n\u00e1mi hefur h\u00fan sinnt kennslu vi\u00f0 H\u00e1sk\u00f3la \u00cdslands, teki\u00f0 \u00fe\u00e1tt \u00ed fr\u00e6\u00f0slug\u00f6ngum \u00e1 vegum H\u00e1sk\u00f3lans og Fer\u00f0af\u00e9lags \u00cdslands, \u00fej\u00e1lfa\u00f0 \u00f3lymp\u00eduli\u00f0i\u00f0 \u00ed l\u00edffr\u00e6\u00f0i, seti\u00f0 \u00ed v\u00edsindanefnd fyrir r\u00e1\u00f0stefnu Norr\u00e6na vistfr\u00e6\u00f0if\u00e9lagsins (Oikos) og \u00ed stj\u00f3rn L\u00edffr\u00e6\u00f0if\u00e9lags \u00cdslands.<\/p>\n<p>Ragnhildur er gift Olgeiri \u00d6rlygssyni. \u00deau b\u00faa \u00ed Reykjav\u00edk \u00e1samt \u00feremur b\u00f6rnum s\u00ednum, \u00feeim \u00d6rlygi D\u00fdra (f. 2008), \u00deur\u00ed\u00f0i Ingu (f. 2010) og Bergsteini (f. 2015).<\/p>\n<\/div><\/div>","protected":false},"featured_media":5285,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2020-10-09T13:00:00+00:00","_phd_date_end":"2020-10-09T15:00:00+00:00","_phd_location":"Ver\u00f6ld - 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