DIFFERENTIAL FEEDING BY MARINE FLAGELLATES ON GROWING VERSUS STARVING, AND ON MOTILE VERSUS NONMOTILE, BACTERIAL PREY
文献类型：期刊论文
| 作者 | GONZALEZ, JM ; SHERR, EB ; SHERR, BF |
| 刊名 | MARINE ECOLOGY-PROGRESS SERIES
 |
| 出版日期 | 1993 |
| 卷号 | 102期号:3页码:257-267 |
| 关键词 | BACTERIVORY FLAGELLATE MICROBIAL LOOP |
| ISSN号 | 0171-8630 |
| 英文摘要 | Previous work has demonstrated selective feeding by bacterivorous protists on the basis of prey size. Other prey characteristics may also affect protist grazing rates. In this study, we investigated relative uptake rates of fluorescently labeled bacterial (FLB) cells made from growing (G-FLB) vs starving bacteria (S-FLB), and of Live-stained motile vs non-motile bacteria by marine phagotrophic flagellates. We also determined relative growth rates and digestion times for flagellates fed growing or starved bacteria. A natural assemblage of marine flagellates and a flagellate isolate, Cafeteria sp., showed lower (p<0.001) clearance rates on S-FLB than on G-FLB, which could be ascribed to size-selective grazing by the flagellates. Moreover, flagellates showed longer (p<0.001) prey digestion times when feeding on S-FLB than on G-FLB. The carbon-based gross growth efficiency of flagellates fed starved bacteria was nearly twice that of flagellates fed growing bacteria: 38.5% and 21.5%, respectively. Uptake rates by flagellates of several live-stained bacteria (LSB) of either motile or nonmotile strains were compared with uptake rates of heat-killed FLB made from the same bacterial cultures. Clearance rates were significantly higher for LSB compared to FLB only for motile strains; no differences in uptake rates were observed for non-motile bacteria. Although FLB may be a good tracer for non-motile bacteria, use of FLB may lead to underestimation of actual grazing rates if motile bacteria comprise a significant fraction of the total bacterial assemblage. Our results suggest (I) grazing on starved bacteria results in a more efficient transfer of biomass to higher trophic levels than does grazing on growing bacteria; (2) use of motile LSB in prey uptake experiments should yield higher estimates of bacterivory compared to rates estimated using heat-killed or non-motile labeled prey; and (3) qualitative factors affecting predator-prey dynamics may be important in regulating elemental fluxes in microbial food webs. |
| 学科主题 | Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography |
| 原文出处 | INTER-RESEARCH |
| 语种 | 英语 |
| 公开日期 | 2012-02-13 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/9304]  |
| 专题 | 南海海洋研究所_海洋微食物网高被引文献 |
| 推荐引用方式 GB/T 7714 | GONZALEZ, JM,SHERR, EB,SHERR, BF. DIFFERENTIAL FEEDING BY MARINE FLAGELLATES ON GROWING VERSUS STARVING, AND ON MOTILE VERSUS NONMOTILE, BACTERIAL PREY[J]. MARINE ECOLOGY-PROGRESS SERIES,1993,102(3):257-267. |
| APA | GONZALEZ, JM,SHERR, EB,&SHERR, BF.(1993).DIFFERENTIAL FEEDING BY MARINE FLAGELLATES ON GROWING VERSUS STARVING, AND ON MOTILE VERSUS NONMOTILE, BACTERIAL PREY.MARINE ECOLOGY-PROGRESS SERIES,102(3),257-267. |
| MLA | GONZALEZ, JM,et al."DIFFERENTIAL FEEDING BY MARINE FLAGELLATES ON GROWING VERSUS STARVING, AND ON MOTILE VERSUS NONMOTILE, BACTERIAL PREY".MARINE ECOLOGY-PROGRESS SERIES 102.3(1993):257-267. |
入库方式： OAI收割
来源：南海海洋研究所
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