The distribution of microplankton in the McMurdo Dry Valley Lakes, Antarctica: response to ecosystem legacy or present-day climatic controls?
The distribution of microplankton in the McMurdo Dry Valley Lakes, Antarctica: response to ecosystem legacy or present-day climatic controls?
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DOI：
10.1007/s00300-003-0582-0
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发表时间：
2004-03
期刊：
影响因子：
1.7
通讯作者：
E. Roberts;J. Priscu;C. Wolf;W. Lyons;J. Laybourn-Parry
中科院分区：
文献类型：
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作者：
E. Roberts;J. Priscu;C. Wolf;W. Lyons;J. Laybourn-Parry
对南极洲麦克默多干谷的邦尼湖、弗里克塞尔湖、乔伊斯湖、霍尔湖和迈尔斯湖的浮游生物丰度和生物量进行了调查。尽管浮游生物群落以长度<100 μm的生物为主，但湖泊之间存在显著差异，包括浮游生物垂直分布的巨大差异和浮游生物总生物量的差异。细菌生物量最高的是在缺氧的单湖中，在弗里克塞尔湖中达到191 μg Cl − 1。光合纳米鞭毛虫占主导地位的浮游植物在研究的五个湖泊。最高的叶绿素浓度记录在弗里克塞尔湖的化跃层（21 μg chlal−1）。异养纳米鞭毛虫的浓度很低，从霍尔的2个细胞/ml到邦尼的237个细胞/ml不等。按照南极洲的标准，弗里克塞尔湖和霍尔湖的纤毛虫在生物量和多样性方面相对成功。相比之下，迈尔斯湖的纤毛虫丰度极低（<0.04个细胞/ml）。在这两个采样场合，桡足类无节幼体观察乔伊斯湖。这是麦克默多干谷湖泊内首次记录到甲壳类浮游动物。由于这些湖泊的食物网是由“自下而上”的力量，浮游生物分布的差异可能与每个湖泊的物理化学特征。湖泊演变（遗产）和当今气候变化对湖泊动力学的影响进行了讨论。
Plankton abundance and biomass were investigated in five lakes of the McMurdo Dry Valleys, Antarctica: Lakes Bonney, Fryxell, Joyce, Hoare and Miers. Despite plankton communities being dominated by organisms <100 μm in length, there were striking differences between the lakes, including large variations in plankton vertical distribution and differences in total plankton biomass. Bacterial biomass was highest in the anoxic monimolimnia of the meromictic lakes, reaching 191 μg C l−1in Lake Fryxell. Photosynthetic nanoflagellates dominated phytoplankton in the five lakes studied. Highest chlorophyllaconcentrations were recorded at the chemocline of Lake Fryxell (21 μg chlal−1). Heterotrophic nanoflagellate concentrations were low, ranging from 2 cells ml−1in Hoare to 237 cells ml−1in Bonney. By Antarctic standards, ciliates were relatively successful in terms of biomass and diversity in Lakes Fryxell and Hoare. In contrast, Lake Miers possessed extremely low ciliate abundance (<0.04 cells ml−1). On both sampling occasions, copepod nauplii were observed in Lake Joyce. This is the first recording of crustacean zooplankton within the McMurdo Dry Valley Lakes. Because the foodwebs of these lakes are structured by “bottom-up” forces, differences in plankton distributions could be related to the physicochemical characteristics of each lake. The effect of lake evolution (legacy) and present-day climate change on planktonic dynamics is discussed.