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, Highlights 3-5 bullet points (max 85 characters, including spaces, per bullet point) ? Glacier retreat is affecting the ecosystem dynamics of high arctic fjords ? Seasonal and spatial environmental changes of Kongsfjorden were examined during 2012 ? The bloom dynamics and changes in the pelagic geochemistry were evaluated ? A singular and strong diatom bloom was observed in May at the fjord glacier front ? Isotopic data revealed very depleted organic material during high melting seasons