Plankton structure a in shallow coastal zone at Admiralty Bay, King George Island, West ­Antarctic Peninsula (WAP): pico, nano and ­microplankton and chlorophyll biomass

D. R. Tenenbaum, J. J. Barrera-Alba, Renatha Barboza Duarte, M. Tenório
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引用次数: 7

Abstract

The phytoplankton composition and biomass are being monitored in Admiralty Bay, Antarctic Peninsula since 2002 to detect possible interannual changes on a long-term perspective. In this report, we present the preliminary results of the 2009/2010 monitoring program regarding phytoplankton size-structure and biomass. Even if mean microplankton densities were similar between December 2009 and February 2010, diferent phytoplankton groups dominated each sampling period. Pennate diatoms showed highest contribution in December, whereas athecate dinoflagellates were the most abundant microplanktonic group in February. Pico and nanoplankton were only detailed during the second sampling period, and results showed that phytoplankton were dominated by cells <10 μm (~104 and 107 cells.L–1, respectively). The shift in phytoplankton structure pointed out by the dominance of picoand nano-size cells in phytoplankton and heterotrophic dinoflagellates in late summer must be confirmed by continuing the long-term monitoring program and the implementation of microvariation sampling effort to identify the factors that are actually influencing phytoplankton populations in this environment.
西南极半岛乔治王岛金钟湾浅海岸带浮游生物结构a:微、纳米、微浮游生物和叶绿素生物量
自2002年以来,我们一直在南极半岛金钟湾监测浮游植物的组成和生物量,以从长期的角度观察浮游植物的年际变化。在本报告中,我们介绍了2009/2010年浮游植物大小结构和生物量监测项目的初步结果。即使在2009年12月至2010年2月期间,平均浮游生物密度相似,但不同的浮游植物类群在每个采样期间占主导地位。在12月份,Pennate硅藻的贡献最大,而在2月份,鞭毛藻是最丰富的微浮游生物群。在第二次采样期间,浮游植物以<10 μm的细胞(~104和107)为主。分别为l - 1)。在夏末浮游植物和异营养鞭毛藻中微细和纳米细胞的优势所指出的浮游植物结构的变化,必须通过持续的长期监测计划和实施微变化采样努力来确认,以确定实际影响该环境中浮游植物种群的因素。
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