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However, glacial iron inputs are thought to be dominated by icebergs. Here we show that surface runoff from three island groups of the maritime Antarctic exports more filterable (&lt;0.45\u2009\u03bcm) iron (6\u201381\u2009kg\u2009km<jats:sup>\u22122<\/jats:sup>\u2009a<jats:sup>\u22121<\/jats:sup>) than icebergs (0.0\u20131.2\u2009kg\u2009km<jats:sup>\u22122<\/jats:sup>\u2009a<jats:sup>\u22121<\/jats:sup>). Glacier-fed streams also export more acid-soluble iron (27.0\u201318,500\u2009kg\u2009km<jats:sup>\u22122<\/jats:sup>\u2009a<jats:sup>\u22121<\/jats:sup>) associated with suspended sediment than icebergs (0\u2013241\u2009kg\u2009km<jats:sup>\u22122<\/jats:sup>\u2009a<jats:sup>\u22121<\/jats:sup>). Significant fluxes of filterable and sediment-derived iron (1\u201310\u2009Gg\u2009a<jats:sup>\u22121<\/jats:sup> and 100\u20131,000\u2009Gg\u2009a<jats:sup>\u22121<\/jats:sup>, respectively) are therefore likely to be delivered by runoff from the Antarctic continent. Although estuarine removal processes will greatly reduce their availability to coastal ecosystems, our results clearly indicate that riverine iron fluxes need to be accounted for as the volume of Antarctic melt increases in response to 21st century climate change.<\/jats:p>","DOI":"10.1038\/ncomms14499","type":"journal-article","created":{"date-parts":[[2017,2,15]],"date-time":"2017-02-15T10:33:35Z","timestamp":1487154815000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":68,"title":["Climatically sensitive transfer of iron to maritime Antarctic ecosystems by surface runoff"],"prefix":"10.1038","volume":"8","author":[{"given":"Andy","family":"Hodson","sequence":"first","affiliation":[]},{"given":"Aga","family":"Nowak","sequence":"additional","affiliation":[]},{"given":"Marie","family":"Sabacka","sequence":"additional","affiliation":[]},{"given":"Anne","family":"Jungblut","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5147-0067","authenticated-orcid":false,"given":"Francisco","family":"Navarro","sequence":"additional","affiliation":[]},{"given":"David","family":"Pearce","sequence":"additional","affiliation":[]},{"given":"Mar\u00eda Luisa","family":"\u00c1vila-Jim\u00e9nez","sequence":"additional","affiliation":[]},{"given":"Peter","family":"Convey","sequence":"additional","affiliation":[]},{"given":"Gon\u00e7alo","family":"Vieira","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2017,2,15]]},"reference":[{"key":"BFncomms14499_CR1","doi-asserted-by":"publisher","first-page":"L16605","DOI":"10.1029\/2011GL048367","volume":"38","author":"AW Schroth","year":"2011","unstructured":"Schroth, A. 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