Ultraplankton growth rates in a subtropical ecosystem
Ultraplankton growth rates in a subtropical ecosystem
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亚热带生态系统中的超浮游生物增长率
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
M. Takahashi
中科院分区：
文献类型：
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作者：
P. Bienfang;M. Takahashi
分离了特定的生长速率（μ），分离了超浮游植物（细胞直径>3μm），损害了夏威夷瓦胡岛附近的亚热带地表水中浮游植物的生物量的70％。在没有放牧者的情况下，叶绿素生物量的植物量在0.037至0.071 H -1（= 1.3至2.5倍d -1）中。当P：B比5至14.5μgCcμg-1 Chl A H-1占率高。通常，在>3μm的生物体中，将亚热带的生态系统摄取的铵摄取率和光合作用率>3μm。比率比3至20μm大小的分数大约75％。 。在少亲子水域中，小细胞浮游植物的占主导地位，部分用其更高的μ，较高的养分同化速率以及通过沉积物损失的。
The ultraplankton (cell diameters >3 μm), which compromises about 70% of the biomass of phytoplankton in subtropical surface waters near Oahu, Hawaii, was isolated for growth rate studies. The specific growth rate (μ) was estimated from the rate of increase of the chlorophyll biomass during incubations in the absence of grazers. This growth rate of the ultraplankton ranged from 0.037 to 0.071 h−1 (=1.3 to 2.5 doublings d−1) during a period when P:B ratios of 5 to 14.5 μg C μg−1 chl a h−1 prevailed. The co-occurrence of atypically high P:B ratios and nonlimiting ambient nutrient concentrations suggests that the calculated values are higher than those characteristic of such subtropical ecosystems in general. Rates of ammonium uptake and photosynthesis by the >3 μm fraction were also compared to those of larger fractions. Organisms in the >3 μm fraction assimilated NH4+at a rate which was about 75% greater than that of the 3 to 20 μm size fraction. Comparison of μ and P:B data collected over a 2 mo period (November–December, 1980) shows that the correlation between these two rate indices is nonlinear. The predominance of small-celled phytoplankton in oligotrophic waters is explained, in part, by its higher μ, its higher nutrient assimilation rates, and the absence of its loss through sedimentation.