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| Titel |
Synergistic effects of iron and temperature on Antarctic phytoplankton and microzooplankton assemblages |
| VerfasserIn |
J. M. Rose, Y. Feng, G. R. DiTullio, R. B. Dunbar, C. E. Hare, P. A. Lee, M. Lohan, M. Long, W. O. Jr. Smith, B. Sohst, S. Tozzi, Y. Zhang, D. A. Hutchins |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 12 ; Nr. 6, no. 12 (2009-12-21), S.3131-3147 |
| Datensatznummer |
250004235
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| Publikation (Nr.) |
 copernicus.org/bg-6-3131-2009.pdf |
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| Zusammenfassung |
| Iron availability and temperature are important limiting factors for the
biota in many areas of the world ocean, and both have been predicted to
change in future climate scenarios. However, the impacts of combined changes
in these two key factors on microbial trophic dynamics and nutrient cycling
are unknown. We examined the relative effects of iron addition (+1 nM) and
increased temperature (+4°C) on plankton assemblages of the Ross Sea,
Antarctica, a region characterized by annual algal blooms and an active
microbial community. Increased iron and temperature individually had
consistently significant but relatively minor positive effects on total
phytoplankton abundance, phytoplankton and microzooplankton community
composition, as well as photosynthetic parameters and nutrient drawdown.
Unexpectedly, increased iron had a consistently negative impact on
microzooplankton abundance, most likely a secondary response to changes in
phytoplankton community composition. When iron and temperature were
increased in concert, the resulting interactive effects were greatly
magnified. This synergy between iron and temperature increases would not
have been predictable by examining the effects of each variable
individually. Our results suggest the possibility that if iron availability
increases under future climate regimes, the impacts of predicted temperature
increases on plankton assemblages in polar regions could be significantly
enhanced. Such synergistic and antagonistic interactions between individual
climate change variables highlight the importance of multivariate studies
for marine global change experiments. |
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