Heterotrophic, autotrophic, and mixotrophic nanoflagellates: Seasonal abundances and bacterivory in a eutrophic lake
Heterotrophic, autotrophic, and mixotrophic nanoflagellates: Seasonal abundances and bacterivory in a eutrophic lake
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DOI：
10.4319/lo.1990.35.8.1821
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发表时间：
1990-12
影响因子：
4.5
通讯作者：
R. Sanders;K. Porter;S. Bennett
中科院分区：
文献类型：
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作者：
R. Sanders;K. Porter;S. Bennett
异养（HF）、自养（AF）和混合营养（MF）纳米鞭毛虫在乔治亚州Oglethorpe湖的丰度在102-104个细胞ml−1之间。在不同年份的样品中，有色鞭毛和非有色鞭毛丰度呈显著正相关，但与相同的物理参数（温度、氧气、光照）相关性不显著。1986年春季，表层无色素鞭毛虫密度最高，为100 × 104 ml - 1；夏季分层时，表层的丰度峰值为4 ~ 7 × 103 cells ml - 1。在初春和晚秋湖泊未分层时，表层水体中色素鞭毛虫（AF + MF）的丰度最高（9 × 103个细胞ml−1）。在任何深度，高达38%（平均10%）的色素鞭毛虫也摄入颗粒，而HF被确定为细菌捕食者的百分比从30%到100%不等。原位放牧率测量结果表明，有色鞭毛虫和非有色鞭毛虫的相对放牧影响存在明显的季节差异，除冬季外，HF对浮游生物的放牧占主导地位。
Abundances of heterotrophic (HF), autotrophic (AF), and mixotrophic (MF) nanoflagellates in Lake Oglethorpe, Georgia, were in the range 102–104 cells ml−1. Pigmented and nonpigmented flagellate abundances were positively correlated with each other in samples spanning a year, but were not significantly correlated to the same physical parameters (temperature, oxygen, light). The highest density of nonpigmented flagellates (> 1 × 104 ml−1) was found in spring 1986 at the surface, although most abundance peaks ranged from 4 to 7 × 103 cells ml−1 and occurred in the metalimnion during summer stratification. Abundances of pigmented flagellates (AF + MF) were greatest (9 × 103 cells ml−1) in surface waters in early spring and late fall when the lake was not stratified. Up to 38% (avg 10%) of all pigmented flagellates at any depth also ingested particles, while the percentage of HF that were identified as bacterivores ranged from 30 to 100%. In situ grazing rate measurements indicated strong seasonal differences in the relative grazing impact of pigmented and nonpigmented flagellates, with HF dominating grazing on picoplankton except in winter.