Study on the life cycle control of green volvocine algae.

本项目采用生态实验和文化实验两种方法进行。研究结果表明：(1)筑湖-朱尼科湖群中的凯托巴诺湖、奥奇奇尼诺湖、小津湖和大池湖的浮游藻类、浮游藻类、浮游藻类和浮游植物优势种均发生了季节变化。总N、NO_3-N、NO_2-N、总P、PO_4-P、硅、氯、几种叶绿素、糖、蛋白质、pH、水温和溶解氧。(3)研究了湖泊红球藻生长对氮源和碳源的需求。此外，还发现了影响湖泊幽门螺孢囊形成和萌发的营养控制因素。

This project was conducted by two approach of ecological and culture experimental methods. The results of this study were as follows;(1) Seasonal changes of volvocine algae, Volvox, Eudorinal Pandorina, and dominant species of phytoplankton were found at Lake Ketobanoike, Lake Ochiguchinoike, Lake Koikuchinoike and Lake Oike in the Lake Tsugaru-Juniko group.(2) Seasonal changes of chemical and physical environments in these four Lakes were detected for the following factors; Total-N, NO_3-N, NO_2-N, Total-P, PO_4-P, Si, Cl, some kinds of chlorophyll, sugar, protein, pH, water temperature and dissolved oxygen.(3) Nitrogen and carbon sources requirements for growth of Haematococcus lacustris were investigated. Moreover, nutritional control factors for cyst formation and germination of H. lacustris were discovered.