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Strong responses of Southern Ocean phytoplankton communities to volcanic ash

Strong responses of Southern Ocean phytoplankton communities to volcanic ash
Strong responses of Southern Ocean phytoplankton communities to volcanic ash
Volcanic eruptions have been hypothesized as an iron supply mechanism for phytoplankton blooms; however, little direct evidence of stimulatory responses has been obtained in the field. Here we present the results of twenty-one 1–2?day bottle enrichment experiments from cruises in the South Atlantic and Southern Ocean which conclusively demonstrated a photophysiological and biomass stimulation of phytoplankton communities following supply of basaltic or rhyolitic volcanic ash. Furthermore, experiments in the Southern Ocean demonstrated significant phytoplankton community responses to volcanic ash supply in the absence of responses to addition of dissolved iron alone. At these sites, dissolved manganese concentrations were among the lowest ever measured in seawater, and we therefore suggest that the enhanced response to ash may have been a result of the relief of manganese (co)limitation. Our results imply that volcanic ash deposition events could trigger extensive phytoplankton blooms, potentially capable of significant impacts on regional carbon cycling.
iron fertilization, volcanic ash, Southern Ocean, colimitation, manganese, phytoplankton
0094-8276
2851-2857
Browning, T.J.
0158e7b6-6096-4b75-a8a7-2b2f0b8b59e0
Bouman, H.A.
28b8c54e-3365-43a5-89ed-16ae62bcaf1e
Henderson, G.M.
1a310365-c407-4667-a617-b8473505a536
Mather, T.A.
97b5dc46-dee8-4dcd-865f-d346fa0783ea
Pyle, D.M.
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Schlosser, C.
7990a0cc-cfe9-4dd5-9c45-899c03186207
Woodward, E.M.S.
3ac3b98f-78c7-4b43-acf9-bba3253752b5
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Browning, T.J.
0158e7b6-6096-4b75-a8a7-2b2f0b8b59e0
Bouman, H.A.
28b8c54e-3365-43a5-89ed-16ae62bcaf1e
Henderson, G.M.
1a310365-c407-4667-a617-b8473505a536
Mather, T.A.
97b5dc46-dee8-4dcd-865f-d346fa0783ea
Pyle, D.M.
30f0cb90-7a4d-4219-9cff-1fabe2f0e4c1
Schlosser, C.
7990a0cc-cfe9-4dd5-9c45-899c03186207
Woodward, E.M.S.
3ac3b98f-78c7-4b43-acf9-bba3253752b5
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12

Browning, T.J., Bouman, H.A., Henderson, G.M., Mather, T.A., Pyle, D.M., Schlosser, C., Woodward, E.M.S. and Moore, C.M. (2014) Strong responses of Southern Ocean phytoplankton communities to volcanic ash. Geophysical Research Letters, 41 (8), 2851-2857. (doi:10.1002/2014GL059364).

Record type: Article

Abstract

Volcanic eruptions have been hypothesized as an iron supply mechanism for phytoplankton blooms; however, little direct evidence of stimulatory responses has been obtained in the field. Here we present the results of twenty-one 1–2?day bottle enrichment experiments from cruises in the South Atlantic and Southern Ocean which conclusively demonstrated a photophysiological and biomass stimulation of phytoplankton communities following supply of basaltic or rhyolitic volcanic ash. Furthermore, experiments in the Southern Ocean demonstrated significant phytoplankton community responses to volcanic ash supply in the absence of responses to addition of dissolved iron alone. At these sites, dissolved manganese concentrations were among the lowest ever measured in seawater, and we therefore suggest that the enhanced response to ash may have been a result of the relief of manganese (co)limitation. Our results imply that volcanic ash deposition events could trigger extensive phytoplankton blooms, potentially capable of significant impacts on regional carbon cycling.

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e-pub ahead of print date: April 2014
Published date: 28 April 2014
Keywords: iron fertilization, volcanic ash, Southern Ocean, colimitation, manganese, phytoplankton
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 364341
URI: http://eprints.soton.ac.uk/id/eprint/364341
ISSN: 0094-8276
PURE UUID: 8d7b758a-b2d9-4cfd-a359-befecc33612d

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Date deposited: 22 Apr 2014 15:59
Last modified: 16 Dec 2019 20:25

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