Comparative Study of the Bioenergetics, Growth Rates and Food Preferences of Heterotrohic Dinoflagellates and Ciliates

9403426 Lessard本项目将研究具有代表性的异养鞭毛藻和纤毛虫在批量培养中的生物能量学、生长和猎物偏好，以确定每一类的营养作用，并确定这两类潜在竞争对手如何在海洋浮游生物中共存。采用14c放射性示踪法对大量具有代表性的异养鞭毛和纤毛虫的生物能量学和食物偏好进行了系统的研究，其中包括直接测量有机物的消化和排泄。将在严格可比的条件下获得有关总生长效率、最大生长速率以及温度和食品质量影响的信息。还将对正鞭毛藻和正鞭毛藻的碳体积关系进行仔细评估，因为这是一个重要但不确定的参数，它极大地影响了总生长效率的估计和生物量的估计。

9403426 Lessard This project will investigate the bioenergetics, growth and prey preferences of representative heterotrophic dinoflagellates and ciliates in batch cultures to define the trophic roles of each group and to determine how these two groups of potential competitors coexist in the marine plankton. A systematic investigation will be done on the bioenergetics and food preferences in a large number of representative heterotrophic dinoflagellates and ciliates using a 14C-radiotracing method which will include direct measures of egestion and excretion of organic matter. Information on gross growth efficiencies, maximal growth rates, and the effects of temperature and food quality will be obtained under strictly comparable conditions. Careful evaluation of the carbon: volume relationship of thecate and athecate dinoflagellates will also be undertaken, as this is an important but uncertain parameter, which greatly affects estimates of gross growth efficiencies and biomass estimations.