Differential responding patterns of the nirK-type and nirS-type denitrifying bacterial communities to an Ulva prolifera green tide in coastal Qingdao areas

Coastal eutrophication may be a vital inducement of green tide. Denitrification is an important nitrogen removal pathway that involves series enzymatic reactions. The rate-limiting step in the conversion nitrite to nitric oxide encoded by two functionally equivalent but structurally distinct genes, copper-containing reductase gene ( nirK ) and cytochrome cd1-containing nirS ). Here, we used Illumina Miseq sequencing approach examine variations denitrifying bacterial community characteristics interactions during Ulva prolifera tide coastal Qingdao areas. Our findings suggested structure were closely related changes chlorophyll content, salinity dissolved oxygen content. -type bacteria more sensitive than bacteria. Additionally, stable complex outbreak phase, while decline phase. All these characters demonstrated respond differently tide, implying they occupy different niches