Marine bacteria and biogeochemical cycling of iron in the oceans
Marine bacteria and biogeochemical cycling of iron in the oceans
复制标题
DOI：
10.1111/j.1574-6941.1999.tb00593.x
复制
发表时间：
1999-05
影响因子：
4.2
通讯作者：
P. Tortell;M. T. Maldonado;J. Granger;N. M. Price
中科院分区：
文献类型：
--
作者：
P. Tortell;M. T. Maldonado;J. Granger;N. M. Price
原核微生物在海洋铁循环中起着关键作用。它们含有近海水域中大部分的生物源铁，并负责浮游生物群落对铁的大部分吸收。在北太平洋亚北极地区，异养物种的表层种群吸收了50%以上的溶解铁，因此与浮游植物直接竞争这一限制性资源。在低营养的热带和亚热带水域，随着单细胞蓝藻数量的增加，光合细菌在铁循环中的作用越来越重要，并且在混合层中含有大部分生物源铁的固氮菌Trichodesmium变得丰富。异养和光养海洋细菌和它们的陆地细菌一样，产生铁结合的铁载体，参与铁的获取。有证据表明，细菌可能通过生产这些配体来改变海洋中的铁化学，从而在调节真核浮游植物的生产中发挥重要作用。
Prokaryotic microbes play a critical role in oceanic Fe cycling. They contain most of the biogenic Fe in offshore waters and are responsible for a large portion of the Fe uptake by the plankton community. In the subarctic North Pacific, surface populations of heterotrophic species assimilate more than 50% of the dissolved Fe and thus compete directly with phytoplankton for this limiting resource. In oligotrophic tropical and subtropical waters, photosynthetic bacteria become more important in Fe cycling as the number of unicellular cyanobacteria increases and the nitrogen-fixing Trichodesmium, which contains most of the biogenic Fe in the mixed layer, becomes abundant. Like their terrestrial counterparts, heterotrophic and phototrophic marine bacteria produce Fe-binding siderophores that are involved in Fe acquisition. Evidence exists that bacteria may modify Fe chemistry in the sea through the production of these ligands and thereby play a significant role in regulating production of eukaryotic phytoplankton.