Abstract. Stalagmite ky1 was collected from Kaiyuan Cave in coastal areas of Shandong Peninsula, northern China, located at warm temperate zone and East Asia monsoon area, it was 75 mm in length, and the top 42.77 mm developed 678 laminae. Based on high precision dating with U-230Th technique, by continuous laminae counting, it can be confirmed that the 1st and 678th layer were 1217 and 1892 AD from top to bottom respectively. By the measurement of layer thickness and δ18O values, we got the layer thickness data and δ18O value time series data from 1217 to 1892 AD, analyzed the climatic significance of layer thickness variation on the basis of comparison. The result show that, in the 678 years from 1217 to 1892 AD, both the layer thickness variation of stalagmite ky1 and the variation of layer thickness fluctuation degree have obvious staged characteristic, and completely synchronized with the contemporaneous summer monsoon intensity/precipitation in time. Among, the thickness of layer and summer monsoon intensity/precipitation have negative correlation themselves. On the other hand, the layer thickness and the fluctuation degree of summer monsoon intensity/precipitation have positive correlation themselves. Therefore, Kaiyuan Cave, in the coastal area of warm temperate zone and East Asia monsoon area, the variation of layer thickness are relate to climatic factors variation themselves, and relate to climate stability degree in addition. For to achieve this, in the coastal area of warm temperate zone and East Asia monsoon area, the climate change between LIA and MWP, in addition to presented like less precipitation and low temperature that is to say dry and cold, also showed the climate stability degree obvious decreased.

Significance and Impact of the Study: Shewanella baltica is one of the commonest spoilage microbial species, predominantly found in chilling seafood. Understanding mechanism of spoilage caused by S. baltica is critical to prevent spoilage of seafoods. This study explored the role of rpoS, a key regulator, in S. baltica. It revealed that rpoS takes part in stress adaptation such as heat, ethanol, H 2 O 2 and NaCl. Biofilm formation of S. baltica was affected by rpoS and incubation temperature. RpoS actively participated in quorum sensing system of S. baltica. This study provides evidence that RpoS is an important coordinator for environmental adaptation in S. baltica.