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121.
Lancelot Hogben 《Journal of genetics》1932,25(3):293-314
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123.
In high-nutrient low-chlorophyll areas, bacterial degradation of organic matter may be iron-limited. The response of heterotrophic
bacteria to Fe addition may be directly controlled by Fe availability and/or indirectly controlled through the effect of enhanced
phytoplankton productivity and the subsequent supply of organic matter suitable for bacteria. In the present study, the role
of Fe on bacterial carbon degradation was investigated through regrowth experiments by monitoring bacterial response to organic
substrates derived from Phaeocystis antarctica cultures set up in <1 nM Fe (LFe) and in Fe-amended (HFe) Antarctic seawater. Results showed an impact of Fe addition on
the morphotype dominance (colonies vs. single cells) of P. antarctica and on the quality of Phaeocystis-derived organic matter. Fe addition leaded to a decrease of C/N ratio of Phaeocystis material. The bacterial community composition was modified as observed from denaturing gradient gel electrophoresis (DGGE)
profiles in LFe as compared to HFe bioassays. The percentage of active bacteria as well as their specific metabolic activities
(ectoenzymatic hydrolysis, growth rates and bacterial growth efficiency) were enhanced in HFe bioassays. As a consequence,
the lability of Phaeocystis-derived organic matter was altered, i.e., after seven days more than 90% was degraded in HFe and only 9% (dissolved) and
55% (total) organic carbon were degraded in LFe bioassays. By inducing increased bacterial degradation and preventing the
accumulation of dissolved organic carbon, the positive effect of Fe supply on the carbon biological pump may partly be counteracted. 相似文献
124.