纳米鞭毛虫对北海底栖细菌生产的影响

Bea J.M. Hondeveld, Gerard Nieuwland, Fleur C. Van Duyl, Rolf P.M. Bak
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引用次数: 27

摘要

在北海夏季和冬季的各种沉积物类型中,研究了底栖异养纳米鞭毛虫对细菌的原位放牧。使用荧光标记细菌(FLB)技术测量放牧率。有几个因素可能影响鞭毛虫的放牧,即温度、沉积物粒度、细菌丰度和产量、鞭毛虫丰度和生物量。Flagellate放牧率与这些变量有关。底栖鞭毛虫种群的总放牧量是通过鞭毛虫丰度乘以最大/最小放牧率来估计的。通过与产生的细菌细胞总量的比较,可以估计鞭毛细菌对底栖细菌产生的影响。每个鞭毛虫每小时的个体放牧率从0到112个细菌不等。夏季和冬季的放牧率没有显著差异,与上述任何变量都没有显著相关性。每个鞭毛虫每小时的最大平均放牧率在15到39个细菌之间。每个鞭毛虫每小时的最小平均值在1到5个细菌之间变化。根据所使用的放牧率,消耗鞭毛虫所占的底栖细菌产量百分比差异很大。使用最大放牧率,夏季消耗了2%至23%的细菌产量,而冬季消耗的细菌产量在23%至528%之间。最低估计值低10到20倍:夏季为0.2%到3%,冬季为1%到50%,消耗的细菌产量百分比更高,这可能是因为与夏季相比,冬季的细菌产量相对较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of nanoflagellate bacterivory on benthic bacterial production in the North Sea

In situ grazing of benthic heterotrophic nanoflagellates on bacteria was studied in a wide range of sediment types in the North Sea during summer and winter. Grazing rates were measured using the fluorescently labelled bacteria (FLB) technique. Several factors may potentially influence flagellate grazing, viz. temperature, sediment grain size, bacterial abundance and production, flagellate abundance and biovolume. Flagellate grazing rates were related to these variables. Total grazing of the benthic flagellate population was estimated by multiplying flagellate abundance by maximum/minimum grazing rates. A comparison with the total amount of bacterial cells produced provided an estimate of the impact of flagellate bacterivory on benthic bacterial production.

Individual grazing rates ranged from 0 to 112 bacteria per flagellate per hour. Grazing rates showed no significant differences between summer and winter and did not correlate significantly with any of the above-mentioned variables. Maximum average grazing rates ranged from 15 to 39 bacteria per flagellate per hour. Minimum average values varied between 1 and 5 bacteria per flagellate per hour.

The percentages of benthic bacterial production accounted for by flagellate consumption differ greatly depending on the grazing rate used. Using maximum grazing rates, 2 to 23% of the bacterial production during summer was consumed, while in winter this ranged from 23 to 528%. Minimum estimates were 10 to 20 times lower: 0.2 to 3% in summer and 1 to 50% in winter, higher percentages of the bacterial production were consumed, which was probably due to the relatively lower bacterial production in winter compared to summer.

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