Mixotrophy in Bloom-Forming Dinoflagellates: Interaction of C, N and P

水华形成甲藻中的混合营养：C、N和P混合营养的相互作用，利用交替的营养模式，是水华形成、光合作用甲藻生理生态的一个重要但鲜为人知的方面。有害的藻类水华似乎在全球范围内日益频繁，并对整个生态系统产生潜在影响。大多数有害藻类共有的一个共同属性是混合营养倾向。许多赤潮甲藻以食物为食。光合作用、摄食和吸收无机和有机营养物质之间的复杂相互作用可能提供营养灵活性，使甲藻在富营养化但资源高度可变的环境中相对于其他浮游植物具有优势。作为正在进行的项目的一部分，正在对微小原甲藻和半裸甲藻(Gyroddium galatheanum；在切斯皮克湾地区也被称为Gyroddium或Gymnodium Euariale)这两种赤潮甲藻进行吞噬混合营养研究。初步证据表明，赤潮甲藻的摄食受到无机营养限制的刺激，摄食与光合作用碳代谢相互作用。这些方面的赤潮甲藻的生理生态将在实验室进行实验研究。

Stoecker 9819670Mixotrophy in Bloom-forming Dinoflagellates: Interactions of C, N and P Mixotrophy, the utilization of alternate modes of nutrition, is an important but poorly understood aspect of the physiological ecology of bloom-forming, photosynthetic dinoflagellates. Harmful algal blooms appear to increasing in frequency world-wide with potential effects on whole ecosystems. One common attribute shared by most harmful algal taxa is mixotrophic tendencies. Many red-tide dinoflagellates eat. Complex interactions between photosynthesis, feeding, and uptake of inorganic and organic nutrients may provide the nutritional flexibility that gives dinoflagellates advantages over other phytoplankton in eutrophic, but highly variable environments with respect to resources.As part of an ongoing project, phagotrophic mixotrophy is being investigated in Prorocentrum minimum and Gyrodinium galatheanum (syn., Gymnodinium galatheanum; also has been called Gyrodinium or Gymnodinium estuariale in Chespeake Bay region), two red-tide dinoflagellates. Preliminary evidence indicates that feeding is stimulated by inorganic nutrient limitation in red-tide dinoflagellates, and that feeding interacts with photosynthetic carbon metabolism. These aspects of the physiological ecology of red-tide dinoflagellates will be experimentally investigated in the laboratory.