Geochemical evidence of oceanic iron fertilization by the Kasatochi volcanic eruption in 2008 and the potential impacts on Pacific sockeye salmon
| Autor: | Peter Croot, Baerbel Langmann, Svend Duggen, Linn Hoffmann, Nazli Olgun, Matthias Hort, C. F. Waythomas |
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| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
surface ocean 010504 meteorology & atmospheric sciences Iron fertilization fe limitation Aquatic Science 01 natural sciences Zooplankton Algal bloom sockeye salmon fraser-river primary productivity hnlc waters Ocean gyre volcanic ash oncorhynchus-nerka 14. Life underwater Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences geography geography.geographical_feature_category Vulcanian eruption Ecology biology 010604 marine biology & hydrobiology fungi ash 16. Peace & justice biology.organism_classification gulf of alaska marine growth enrichment experiments Oceanography diatom bloom kasatochi eruption Oncorhynchus Environmental science ne pacific Bloom sub-arctic pacific geographic locations Volcanic ash |
| Zdroj: | Marine Ecology Progress Series, 488 . pp. 81-88. |
| Popis: | The Kasatochi volcanic eruption that occurred in the central Aleutian Islands in Alaska, USA, in August 2008 is thought to have induced a massive diatom bloom in the iron-limited waters of the Gulf of Alaska, which potentially affected the oceanic food web by increasing the abundance of zooplankton and sockeye salmon Oncorhynchus nerka in the northeast Pacific Ocean. We report the first seawater experiments involving volcanic ash ejected from the Kasatochi eruption, showing that the ash released 61 to 83 nmol Fe, 374 to 410 nmol NO3-, 5 to 6 nmol PO43- and 170 to 585 nmol SiO2 when it contacted seawater. Our study suggests that the amount of iron released from Kasatochi ash (an increase of 2.0 to 2.8 nM Fe) was indeed sufficient to cause the observed phytoplankton bloom in the northeastern Pacific Gyre, while the impact of macronutrient release was minimal. We further evaluated the multiple, interdependent processes in the oceanic food web related to the diatom bloom, involving the ocean survival of juvenile salmon that entered the northeast Pacific Ocean in the summer of 2008. |
| Databáze: | OpenAIRE |
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