Ecogenomic sensor reveals controls on N2-fixing microorganisms in the North Pacific Ocean
| Autor: | Samuel T. Wilson, Deniz Bombar, Kelvin J. Richards, Christopher A. Scholin, David M. Karl, John P. Ryan, Matthew J. Church, François Ascani, Roman Marin, Julie Robidart, Jonathan P. Zehr |
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| Rok vydání: | 2013 |
| Předmět: |
Pacific Ocean
Bacteria Geomicrobiology Ecology Sampling (statistics) Global change Genomics Robotics Biology New production Atmospheric sciences Cyanobacteria Microbiology Polymerase Chain Reaction Microbial ecology Abundance (ecology) Nitrogen Fixation Ecosystem Seawater Original Article Keystone species Ecology Evolution Behavior and Systematics |
| Zdroj: | The ISME journal. 8(6) |
| ISSN: | 1751-7370 |
| Popis: | Nitrogen-fixing microorganisms (diazotrophs) are keystone species that reduce atmospheric dinitrogen (N2) gas to fixed nitrogen (N), thereby accounting for much of N-based new production annually in the oligotrophic North Pacific. However, current approaches to study N2 fixation provide relatively limited spatiotemporal sampling resolution; hence, little is known about the ecological controls on these microorganisms or the scales over which they change. In the present study, we used a drifting robotic gene sensor to obtain high-resolution data on the distributions and abundances of N2-fixing populations over small spatiotemporal scales. The resulting measurements demonstrate that concentrations of N2 fixers can be highly variable, changing in abundance by nearly three orders of magnitude in less than 2 days and 30 km. Concurrent shipboard measurements and long-term time-series sampling uncovered a striking and previously unrecognized correlation between phosphate, which is undergoing long-term change in the region, and N2-fixing cyanobacterial abundances. These results underscore the value of high-resolution sampling and its applications for modeling the effects of global change. |
| Databáze: | OpenAIRE |
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