Influence of trace metal release from volcanic ash on growth of Thalassiosira pseudonana and Emiliania huxleyi.

Hoffmann, Linn J., Breitbarth, Eike, Ardelan, M. V., Duggen, Svend, Olgun, Nazli, Hassellöv, M. and Wängberg, S.-A. (2012) Influence of trace metal release from volcanic ash on growth of Thalassiosira pseudonana and Emiliania huxleyi. Marine Chemistry, 132-133 . pp. 28-33. DOI 10.1016/j.marchem.2012.02.003.

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Abstract

Recent studies demonstrate that volcanic ash has the potential to increase phytoplankton biomass in the open ocean. However, besides fertilizing trace metals such as Fe, volcanic ash contains a variety of potentially toxic metals such as Cd, Cu, Pb, and Zn. Especially in coastal regions closer to the volcanic eruption, where ash depositions can be very high, toxic effects are possible. Here we present the first results of laboratory experiments, showing that trace metal release from different volcanic materials can have both fertilizing and toxic effects on marine phytoplankton in natural coastal seawater. The diatom Thalassiosira pseudonana generally showed higher growth rates in seawater that was in short contact with volcanic ash compared to the controls without ash addition. In contrast to that, the addition of volcanic ash had either no effect or significantly decreased the growth rate of the coccolithophoride Emiliania huxleyi. It was not possible to attribute the effects to single trace metals, however, our results suggest that Mn plays an important role in regulating the antagonistic and synergistic effects of the different trace metals. This study shows that volcanic ash can lead to changes in the phytoplankton species composition in the high fall-out area of the surface ocean.
Highlights:
► We tested the effect of volcanic ash on growth of T. pseudonana and E. huxleyi ► Volcanic ash increased growth of T. pseudonana but not of E. huxleyi ► Mn seems important to regulate the effects of different trace metals from the ash ► Volcanic eruptions have the potential to change phytoplankton community structures

Document Type: Article
Keywords: Marine chemistry; Thalassiosira pseudonana; Emiliania huxleyi; volcanic ash; pumice; fertilization; toxicity
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.marchem.2012.02.003
ISSN: 0304-4203
Projects: NOVUM
Date Deposited: 24 Feb 2012 13:23
Last Modified: 22 Aug 2017 12:51
URI: http://oceanrep.geomar.de/id/eprint/13805

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