http://scholars.ntou.edu.tw/handle/123456789/23831
Title: | Protistal Grazers Increase Grazing on Unicellular Cyanobacteria Diazotroph at Night | Authors: | Deng, Lixia Cheung, Shunyan Liu, Hongbin |
Keywords: | C:N ratio;Crocosphaera;Chlorella;protist;grazing selectivity;NORTH PACIFIC;NITROGEN-FIXATION;ELEMENTAL STOICHIOMETRY;MARINE CYANOBACTERIUM;PHYTOPLANKTON GROWTH;DIEL VARIATION;FRESH-WATER;BALTIC SEA;PREY;MICROZOOPLANKTON | Issue Date: | May-2020 | Publisher: | FRONTIERS MEDIA SA | Journal Volume: | 7 | Source: | Frontiers in Marine Science | Abstract: | In this study, we have for the first time analyzed diel microzooplankton grazing selectivity on unicellular cyanobacterial diazotroph (i.e., Crocosphaera watsonii WH8501) and non-diazotrophic unicellular microalga (i.e., Chlorella autotrophica). A mixed diet consisting of these two phytoplankton was supplied to four species of protistal grazers during daytime and nighttime, respectively. C. watsonii fixes nitrogen during nighttime and showed a stronger diel pattern of cellular C:N ratio than C. autotrophica. All four grazers ingested more nighttime C. watsonii than daytime C. watsonii, suggesting the diazotroph became more nutritious (inferred by C:N ratio) and thus a preferred prey for grazers when it fixes nitrogen. In particular, Oxyrrhis marina changed from preferring C. autotrophica during daytime to preferring C. watsonii during nighttime. The rest grazers showed species-specific grazing preferences, which could be explained by extracellular polysaccharide production of C. watsonii, feeding mode, cingulum size and cell size of grazers. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/23831 | ISSN: | 2296-7745 | DOI: | 10.3389/fmars.2020.00135 |
Appears in Collections: | 海洋生物研究所 |
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