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DISTRIBUTION AND ABUNDANCE OF CHOANOFLAGELLATES IN GREAT-WALL BAY, KING GEORGE ISLAND, ANTARCTICA TN AUSTRAL SUMMER (15th Symposium on Polar Biology)

机译:澳大利亚南极洲乔治王岛长城湾CHOaNOFLaGELLaTEs的分布和丰度(第15届极地生物学研讨会)

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摘要

Eleven species of seven genera of loricate choanoflagellates were found in Great-Wall Bay, King George Island, west Antarctica during the sampling period from January 22 to February 8, 1991. Among them, Pleurasiga orculaeformis aff. was a new record in Antarctic waters. Choanoflagellates was an abundant taxa in Great-Wall Bay. Their total abundance ranged from 5.1 × 10^3 to 5.3 × 10^4 cells/l. The spatial distribution of choanoflagellate species and abundance showed heterogeneous patterns. The maximum concentration of chlorophyll a and the highest abundance of choanoflagellates were located at depths of 20 m and 30 m respectively. Choanoflagellates usually showed a tendency to follow the variations of chlorophyll a concentration in their vertical abundance. Regression analysis on the basis of 40 data sets showed that there was a positive correlation between abundance of choanoflagellates and chlorophyll a concentration in this season. The four dominant species of choanoflagellates, Bicosta spinifera, Crinolina aperta, Diaphanoeca multiannulata and Parvicorbicula circularis, were distributed widely from the surface to the bottom in Great-Wall Bay. They were counted for more than 90% of total choanoflagellates in all layers. B. spinifera was up to about 41% of the mean value of surface abundance of total choanoflagellates. D. multiannulata reached the highest abundance of 2.2 × 10^4 cells/l at 20 m depth on January 25.
机译:在1991年1月22日至2月8日的采样期间,在南极洲西部的乔治国王岛的长城湾发现了七属鞭毛鞭毛虫的11个属。其中有Pleurasiga orculaeformis aff。是南极水域的新纪录。鞭毛虫是长城湾的一个丰富的分类单元。它们的总丰度范围为5.1×10 ^ 3到5.3×10 ^ 4细胞/ l。鞭毛藻种类和丰富度的空间分布显示出异质性模式。叶绿素a的最大浓度和鞭毛鞭毛的丰度最高,分别位于20 m和30 m处。鞭毛鞭毛通常表现出在垂直丰度上跟随叶绿素a浓度变化的趋势。根据40个数据集进行的回归分析表明,该季节中鞭毛鞭毛虫的丰度与叶绿素a浓度之间存在正相关。在长城湾,从表面到底部,鞭毛鞭毛虫的四个优势种广泛分布在地表至底部。它们分别是Bicosta spinifera,Crinolina aperta,Diaphanoeca multiannulata和Parvicorbicula circleis。在所有层中,它们被认为占鞭毛总数的90%以上。棘孢杆菌占总鞭毛虫表面丰度平均值的约41%。 1月25日,多环藻D.multiannulata在20 m深度达到2.2×10 ^ 4细胞/ l的最高丰度。

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    Bo CHEN;

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