Count data of germinated Gonyostomum semen cells and subsequent cell divisions

Colonization of new habitats through dispersal of phytoplankton cysts might be limited, if resident populations outcompete invaders during germination. We reciprocally transferred Gonyostomum semen (Raphidophyceae) cysts from three lakes into native and foreign waters originating from the respective habitats. Germination rate and germling growth were impacted by water origin, but there was no preference for native water. Gonyostomum semen's ability to germinate in different conditions might explain its expansion in northern Europe.

若原生浮游植物种群在萌发阶段相较于入侵种群更具竞争优势，则通过浮游植物孢囊传播实现的新生境定殖过程可能会受到限制。本研究开展互易移植实验：将采自三个湖泊的尾裸藻（Gonyostomum semen，异鞭藻纲Raphidophyceae）孢囊，分别接种至对应原生境水体与其余两个湖泊的外来水体中。实验结果显示，水体来源对孢囊萌发率及萌发体生长速率均存在显著影响，但尾裸藻并未表现出对原生境水体的萌发偏好性。尾裸藻在多样水环境中均可萌发的特性，或可解释其在北欧地区的种群扩张现象。