Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy.
Department of Biology, Università degli Studi di Napoli Federico II, Complesso Universitario di Monte Sant'Angelo, Naples, 80126, Italy.
J Phycol. 2021 Apr;57(2):541-550. doi: 10.1111/jpy.13112. Epub 2021 Jan 29.
Antarctic regions are known to be mainly dominated by diatoms in the water column under sea ice. In this study, we report for the first time two distinct phytoplankton blooms dominated by nanoflagellates (<15 µm) under the landfast ice in Terra Nova Bay during the late spring-early summer 2015/2016. The taxa included the pelagic Bolidophyceae Pentalamina corona, the Chrysophyceae Ochromonas spp. and the Chlorophyceae Chlamydomonas spp., typically found in fresh waters, and the Prymnesiophyceae Phaeocystis antarctica usually observed dominating in polynya areas. These species represented from 40% to 91% of the total phytoplankton community, a percentage contrasting with the prevalence of diatoms found previously. The dominance of nanoflagellates, rather than diatoms, during late spring and early summer may have important implications for trophic relationships in Antarctic waters and the presence of typical freshwater species could indicate a great input of continental waters related to environmental changes.
南极地区的海水水柱中主要以硅藻为主。在本研究中，我们首次报告了在 2015/2016 年晚春至初夏期间，特内纳湾的陆架冰下存在由纳米浮游植物（<15 µm）主导的两种截然不同的浮游植物水华现象。这些浮游植物包括浮游的 Bolidophyceae Pentalamina corona、Chrysophyceae Ochromonas spp. 和 Chlorophyceae Chlamydomonas spp.，它们通常存在于淡水中，以及 Prymnesiophyceae Phaeocystis antarctica，通常在冰间湖地区占主导地位。这些物种占总浮游植物群落的 40%至 91%，与之前发现的硅藻占优势的情况形成对比。在晚春和初夏期间，纳米浮游植物而非硅藻占主导地位，这可能对南极水域的营养关系产生重要影响，而典型淡水物种的存在可能表明与环境变化相关的大陆水的大量输入。
