Importance of stirring in the development of an iron-fertilized phytoplankton bloom
- 1 October 2000
- journal article
- letter
- Published by Springer Science and Business Media LLC in Nature
- Vol. 407 (6805), 727-730
- https://doi.org/10.1038/35037555
Abstract
The growth of populations is known to be influenced by dispersal, which has often been described as purely diffusive1,2. In the open ocean, however, the tendrils and filaments of phytoplankton populations provide evidence for dispersal by stirring3,4. Despite the apparent importance of horizontal stirring for plankton ecology, this process remains poorly characterized. Here we investigate the development of a discrete phytoplankton bloom, which was initiated by the iron fertilization of a patch of water (7 km in diameter) in the Southern Ocean5. Satellite images show a striking, 150-km-long bloom near the experimental site, six weeks after the initial fertilization. We argue that the ribbon-like bloom was produced from the fertilized patch through stirring, growth and diffusion, and we derive an estimate of the stirring rate. In this case, stirring acts as an important control on bloom development, mixing phytoplankton and iron out of the patch, but also entraining silicate. This may have prevented the onset of silicate limitation, and so allowed the bloom to continue for as long as there was sufficient iron. Stirring in the ocean is likely to be variable, so blooms that are initially similar may develop very differently.Keywords
This publication has 23 references indexed in Scilit:
- Does iron fertilization lead to rapid carbon export in the Southern Ocean?Geochemistry, Geophysics, Geosystems, 2000
- On filament width in oceanic plankton distributionsJournal of Plankton Research, 2000
- Co-limitation of phytoplankton growth by light and Fe during winter in the NE subarctic Pacific OceanDeep Sea Research Part II: Topical Studies in Oceanography, 1999
- SeaWiFS satellite ocean color data from the Southern OceanGeophysical Research Letters, 1999
- Technical note The SeaWiFS Automatic Data Processing System (SeaAPS)International Journal of Remote Sensing, 1999
- Ocean color chlorophyll algorithms for SeaWiFSJournal of Geophysical Research: Oceans, 1998
- Lateral mixing and the North Atlantic Tracer Release Experiment: Observations and numerical simulations of Lagrangian particles and a passive tracerJournal of Geophysical Research: Oceans, 1998
- Physical evolution of the IronEx-I open ocean tracer patchDeep Sea Research Part II: Topical Studies in Oceanography, 1998
- Sulphur hexafluoride as a tracer of biogeochemical and physical processes in an open-ocean iron fertilisation experimentDeep Sea Research Part II: Topical Studies in Oceanography, 1998
- A biogeochemical study of the coccolithophore, Emiliania huxleyi, in the North AtlanticGlobal Biogeochemical Cycles, 1993