Response of microbial community of surface and deep chlorophyll maximum to nutrients and light in South China Sea

In oligotrophic seas such as South China Sea, the subsurface or deep chlorophyll maximum (DCM) is always present. The surface planktonic community receives sufficient light, but short of nutrients. DCM layer under light limitation, frequent supply Therefore, vertical mixing becomes critical in determining their composition and drives changes by responding to this study, we conducted an onboard experiment collecting seawater samples at adding nutrients, incubated them full sunlight 10% examined diversity bacterial eukaryotic communities cell abundance using 16/18S high throughput sequencing FCM approaches. Our study found large differences structure between DCM. After 72 hours culture, taxonomically water was dominated pico-eukaryotic phytoplankton, while diatoms, which suggests diatoms are main functional group phytoplankton bloom after a event. These findings indicate that respond enhanced supplied nutrients due thus maintain primary productivity otherwise oceans.