Institute of Microbiology CAS, Opatovický mlýn, 379 81 Třeboň, Czechia.
Environ Microbiol. 2011 Oct;13(10):2717-25. doi: 10.1111/j.1462-2920.2011.02540.x. Epub 2011 Sep 1.
The distribution of aerobic anoxygenic phototrophs (AAPs) was surveyed in various regions of the Mediterranean Sea in spring and summer. These phototrophic bacteria were present within the euphotic layer at all sampled stations. The AAP abundances increased with increasing trophic status ranging from 2.5 × 10(3) cells per ml in oligotrophic Eastern Mediterranean up to 90 × 10(3) cells per ml in the Bay of Villefranche. Aerobic anoxygenic phototrophs made up on average 1-4% of total prokaryotes in low nutrient areas, whereas in coastal and more productive stations these organisms represented 3-11% of total prokaryotes. Diel bacteriochlorophyll a decay measurements showed that AAP community in the Western Mediterranean grew rapidly, at rates from 1.13 to 1.42 day(-1). The lower AAP abundances registered in the most oligotrophic waters suggest that they are relatively poor competitors under nutrient limiting conditions. Instead, AAPs appear to be metabolically active organisms, which thrive better in more eutrophic environments providing the necessary substrates to maintain high growth rates.
本研究调查了春夏季地中海不同区域好氧型、厌氧型光合细菌（AAP）的分布。在所有采样点，这些光合细菌均存在于透光层中。AAP 的丰度随营养状态的增加而增加，从营养贫瘠的东地中海的 2.5×10(3)个细胞/ml 到滨海且生产力较高的比亚里茨湾的 90×10(3)个细胞/ml。在低营养区，AAP 平均占总原核生物的 1-4%，而在沿海和生产力较高的站位，这些生物占总原核生物的 3-11%。昼夜细菌叶绿素 a 衰减测量表明，西地中海的 AAP 群落生长迅速，增长率为 1.13 到 1.42 天(-1)。在最贫瘠的水域中记录到的 AAP 丰度较低表明，在营养限制条件下，它们的竞争力相对较弱。相反，AAP 似乎是代谢活跃的生物体，在更富营养化的环境中生长得更好，为维持高增长率提供了必要的基质。
