Abundance and size composition of the summer phytoplankton communities in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska
Abundance and size composition of the summer phytoplankton communities in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska
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北太平洋西部、白令海和阿拉斯加湾夏季浮游植物群落的丰度和规模组成
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发表时间：
1996
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通讯作者：
T. Odate
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作者：
T. Odate
1986年夏季，在北太平洋西部、白令海和阿拉斯加湾测量了浮游植物粒度分级样品的叶绿素含量。在100 m以上的样品中（共2 - 10个样品），207个样品以微型（>10 μm）或微微型（<2 μm）浮游生物为主，只有3个样品以微型浮游生物（2-10 μm）为代表。这207个样品根据总叶绿素a含量分为三种类型：H型（>1.0 μg l−1），M型（0.5-1.0 μg l−1）和L型（<0.5 μg l−1）。这些类型进一步分为两个亚型（-p和-m），根据占主导地位的皮科（-p）和微型浮游生物（-m）。阿拉斯加湾浮游植物群落以L-p型为代表，80%的样品属于这一类型。在北太平洋西部和白令海的大洋域，分别有53%和41%的样品被鉴定为M-p型。在白令海中部，68%的样品在硝化线以下采集的H-m型，这表明微植物水华。在阿留申群岛附近的浅海沃茨也观察到这种类型。上述这些类型与浮游植物丰度的增加归因于微型浮游生物的增长的总趋势一致。一个不寻常的类型发生在中域的硝态线以上，那里的微型浮游生物占主导地位，但总的Chla较少（L-m型）。这种类型代表了冰缘水华晚期的特征。另一个不寻常的类型主要发现在白令海的外域，那里的总叶绿素a高，微微型浮游生物占主导地位（类型H-p）。微型浮游生物的优势似乎是由于大型哲水蚤桡足类对微型浮游生物而不是对微型浮游生物的严重摄食强度造成的
Chlorophylla concentrations (Chla) of size-fractionated phytoplankton samples were measured in the western North Pacific Ocean, the Bering Sea, and the Gulf of Alaska during the summer of 1986. Among samples collected in the upper 100 m (total of 210 samples), 207 samples were dominated by micro- (>10 μm) or picoplankton (<2 μm) and only three samples were represented by nanoplankton (2–10 μm). These 207 samples were classified based on the total Chla content into three types: Type H (>1.0 μg l−1), Type M (0.5–1.0 μg l−1), and Type L (<0.5 μg l−1). These types further divided into two subtypes (-p and-m), depending upon dominancy of pico (-p) and microplankton (-m). The phytoplankton community was represented by Type L-p in the Gulf of Alaska, where 80% of the samples fell into this type. It was represented by Type M-p in the western North Pacific and the Oceanic Domain in the Bering Sea, where 53 and 41% of samples were identified as this type, respectively. In the Middle Domain of the Bering Sea, 68% of samples collected below the nitracline was Type H-m, which indicates blooms of microplanton. This type was also observed in the neritic waters near the Aleutian Islands. These types described above are consistent with a general trend that an increase in phytoplankton abundance is attributed to the growth of microplankton. An unusual type occurred above the nitracline of the Middle Domain, where microplankton prevailed, although the total Chla was less (Type L-m). This type represents a feature of late phase of an ice edge bloom. Another unusual type was found mainly in the Outer Domain of the Bering Sea, where the total Chla was high and picoplankton prevailed (Type H-p). The predominance of picoplankton seems to result from the heavy grazing intensity of large calanoid copepods upon microplankton but not upon picoplankton