Chrysolepidomonas dendrolepidota was described recently and little is known of its distribution, physiology or ecology. Although many photosynthetic chrysophytes have been identified as mixotrophic, combining photosynthesis and phagotrophy, this study provides the first evidence of mixotrophic nutrition in C. dendrolepidota. In a 2 × 2 factorial experiment with relatively high and low levels of light and nutrients, the ingestion rate was highest in the high-light, low-nutrient treatment. Growth rates and abundance increased in high- versus low-light conditions. In additional experiments with nitrogen and phosphorus modified separately, ingestion rate was different from the control only in the treatment with both macronutrients reduced. Supplementing low-nutrient treatments with additional bacteria led to an increase in algal abundance relative to controls without added bacteria. These results indicate that acquisition of major nutrients is a likely driver of mixotrophic nutrition in C. dendrolepidota. Although the distribution of C. dendrolepidota is unknown, mixotrophic chrysophytes can seasonally dominate planktonic algal abundance in some aquatic systems, and nutrient limitation is known to increase bacterivory in some of those species. Identifying and understanding how different mixotrophic species respond to changing environmental cues is crucial to understanding their roles in aquatic food webs.

中文翻译：

---

光、溶解的养分和猎物对新发现的混合营养藻类 Chrysolepidomonas dendrolepidota（金藻科）的摄取和生长的影响

最近描述了 Chrysolepidomonas dendrolepidota，对其分布、生理或生态知之甚少。尽管许多光合金藻已被确定为混合营养，结合了光合作用和吞噬营养，但这项研究提供了 C. dendrolepidota 混合营养营养的第一个证据。在光照和营养水平相对较高和较低的 2 × 2 析因实验中，高光照、低营养处理的摄取率最高。在高光和低光条件下，生长率和丰度增加。在单独修改氮和磷的额外实验中，摄入率仅在两种常量营养素都减少的处理中与对照不同。相对于没有添加细菌的对照，用额外的细菌补充低营养处理导致藻类丰度增加。这些结果表明，主要营养素的获取可能是 C. dendrolepidota 中混合营养的驱动因素。尽管 C. dendrolepidota 的分布是未知的，但混合营养的金藻可以季节性地支配一些水生系统中浮游藻类的丰度，并且已知营养限制会增加其中一些物种的细菌。识别和理解不同的混合营养物种如何响应不断变化的环境线索对于理解它们在水生食物网中的作用至关重要。尽管 C. dendrolepidota 的分布尚不清楚，但混合营养的金藻可以季节性地支配某些水生系统中浮游藻类的丰度，并且已知营养限制会增加其中一些物种的细菌数量。识别和了解不同的混合营养物种如何对不断变化的环境线索做出反应，对于了解它们在水生食物网中的作用至关重要。尽管 C. dendrolepidota 的分布是未知的，但混合营养的金藻可以季节性地支配一些水生系统中浮游藻类的丰度，并且已知营养限制会增加其中一些物种的细菌。识别和理解不同的混合营养物种如何响应不断变化的环境线索对于理解它们在水生食物网中的作用至关重要。