The use of a mucus trap by Dinophysis acuta for the capture of Mesodinium rubrum prey under culture conditions

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• 作者：Gemma Gimé ; nez Papiol ; ^{gemma.gimenez@fundacio.urv.cat" class="auth_mail" title="E-mail the corresponding author} ; Veronica Beuzenberg ; Andrew I. Selwood ; Lincoln MacKenzie ; Michael A. Packer
• 关键词：Dinophysis acuta ; Mesodinium rubrum ; Myrionecta rubra ; Mixotrophy ; Mucus trap ; Pectenotoxin
• 刊名：Harmful Algae
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：58
• 期：Complete
• 页码：1-7
• 全文大小：2511 K

文摘

A capture mechanism observed in a culture of the dinoflagellate Dinophysis acuta when preying on the ciliate Mesodinium rubrum (also sometimes referred to as Myrionecta rubra) is described. The dinoflagellate released cohesive clumps of mucilage into the culture media. When M. rubrum cells came into contact with this mucilage, they were immediately immobilized, but remained alive for a short period of time. Observations of D. acuta cells ‘visiting and probing’ trapped M. rubrum cells were made and at a critical point D. acuta cells removed individual M. rubrum cells from the mucus to swim away with them. The removal of M. rubrum from the mucus coincided with the cells losing all their cilia and becoming swollen, presumably signifying the death of the cell. These changes may enable the D. acuta peduncle to penetrate the ciliate cell cortex. It is hypothesized that toxins produced by D. acuta play a role in the immobilization process within the mucilage trap.