Spatial Variability of Living Coccolithophore Distribution in the Western Subarctic Pacific and Western Bering Sea
Spatial Variability of Living Coccolithophore Distribution in the Western Subarctic Pacific and Western Bering Sea
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DOI：
10.1023/b:joce.0000038063.81738.ab
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发表时间：
2004-04
影响因子：
2.3
通讯作者：
H. Hattori;M. Koike;K. Tachikawa;H. Saito;K. Nagasawa
中科院分区：
文献类型：
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作者：
H. Hattori;M. Koike;K. Tachikawa;H. Saito;K. Nagasawa
1997年夏季，在亚北极西部太平洋和白令海西部0-50m深度范围内观测到球藻生物体的垂直分布。共采集到35种球藻。总体而言，虽然白令海西部的种类较少，但埃米利亚尼亚huxleyi var.huxleyi是最丰富的分类群，占所有球藻生物量的82.8%。在北纬41°以南、东经175°以东(过渡带)，该物种的丰度最高，达到L−1水柱的10,000个细胞。除该种外，Pelagicus球藻占4.2%，是亚北极太平洋西部现生生物的代表；白令海球藻则相对丰富，占2.6%。浮游植物现存量位于41°N以南(>；241×106个m−2)和170°E以东(542×106个m−2)，温度高于12℃，盐度大于34.2。最低的现存量作物出现在白令海和俄亥俄州地区，那里的温度低于6-10°C，盐度低于33.0。根据球石生物体的体积，根据斯托克定律，过渡区、亚北冰区和白令海地区的方解石储量分别为73.0、9.7和6.9 mg m−2，相应的方解石通量分别为3.6、0.5和0.3 mg m−2 d−1。
Vertical distributions of coccolithophores were observed in the depth range 0–50 m in the western subarctic Pacific and western Bering Sea in summer, 1997. Thirty-five species of coccolithophores were collected. Overall,Emiliania huxleyivar.huxleyiwas the most abundant taxon, accounting for 82.8% of all coccolithophores, although it was less abundant in the western Bering Sea. Maximum abundance of this species was found in an area south of 41°N and east of 175°E (Transition Zone) reaching >10,000 cells L−1in the water column. In addition to this species,Coccolithus pelagicusf.pelagicus, which accounted for 4.2% of the assemblage, was representative of the coccolithophore standing crop in the western part of the subarctic Pacific.Coccolithus pelagicusf.hyalinuswas relatively abundant in the Bering Sea, accounting for 2.6% of the assemblage. Coccolithophore standing crops in the top 50 m were high south of 41°N (>241 × 106cells m−2) and east of 170°E (542 × 106cells m−2) where temperatures were higher than 12°C and salinities were greater than 34.2. The lowest standing crop was observed in the Bering Sea and Oyashio areas where temperatures were lower than 6–10°C and salinities were less than 33.0. From the coccolithophore volumes, the calcite stocks in the Transition, Subarctic, and the Bering Sea regions were estimated to be 73.0, 9.7, and 6.9 mg m−2, respectively, corresponding to calcite fluxes of 3.6, 0.5, and 0.3 mg m−2d−1using Stoke's Law.