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| Titel |
Understanding predicted shifts in diazotroph biogeography using resource competition theory |
| VerfasserIn |
S. Dutkiewicz, B. A. Ward, J. R. Scott, M. J. Follows |
| 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 ; 11, no. 19 ; Nr. 11, no. 19 (2014-10-08), S.5445-5461 |
| Datensatznummer |
250117628
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| Publikation (Nr.) |
 copernicus.org/bg-11-5445-2014.pdf |
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| Zusammenfassung |
| We examine the sensitivity of the biogeography of nitrogen fixers to
a warming climate and increased aeolian iron deposition in the
context of a global earth system model. We employ concepts from the
resource-ratio theory to provide a simplifying and transparent
interpretation of the results. First we demonstrate that a set of
clearly defined, easily diagnosed provinces are consistent with the
theory. Using this framework we show that the regions most vulnerable
to province shifts and changes in diazotroph biogeography are the
equatorial and South Pacific, and central Atlantic. Warmer and
dustier climates favor diazotrophs due to an increase in the ratio
of supply rate of iron to fixed nitrogen. We suggest that the
emergent provinces could be a standard
diagnostic for global change models, allowing for rapid and
transparent interpretation and comparison of model predictions and
the underlying mechanisms. The analysis suggests
that monitoring of real world province boundaries, indicated by
transitions in surface nutrient concentrations, would provide
a clear and easily interpreted indicator of ongoing global
change. |
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