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| 1. |
Can You Bottle Nature? The Roles of Microcosms in Ecological Research |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 663-664
Curtis C. Daehler,
Donald R. Strong,
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ISSN:0012-9658
DOI:10.2307/2265487
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 2. |
The Ecotron Facility at Silwood Park: The Value of "Big Bottle" Experiments |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 665-669
John H. Lawton,
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PDF (622KB)
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ISSN:0012-9658
DOI:10.2307/2265488
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 3. |
Microcosms as Models for Generating and Testing Community Theory |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 670-677
James A. Drake,
Gary R. Huxel,
Chad L. Hewitt,
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PDF (917KB)
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ISSN:0012-9658
DOI:10.2307/2265489
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 4. |
Microcosm Experiments have Limited Relevance for Community and Ecosystem Ecology |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 677-680
Stephen R. Carpenter,
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PDF (494KB)
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ISSN:0012-9658
DOI:10.2307/2265490
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 5. |
Bottle or Big‐Scale Studies: How do we do Ecology? |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 681-685
Anthony R. Ives,
Johannes Foufopoulos,
Eric D. Klopfer,
Jennifer L. Klug,
Todd M. Palmer,
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PDF (638KB)
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ISSN:0012-9658
DOI:10.2307/2265491
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 6. |
The Role of Soil Microcosms in the Study of Ecosystem Processes |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 685-690
Herman A. Verhoef,
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PDF (690KB)
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ISSN:0012-9658
DOI:10.2307/2265492
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 7. |
Soil Microcosms and the Population Biology of Nematophagous Fungi |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 690-693
B. A. Jaffee,
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PDF (513KB)
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ISSN:0012-9658
DOI:10.2307/2265493
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 8. |
Microcosms and soil Ecology: Critical Linkages between Fields Studies and Modelling Food Webs |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 694-705
John C. Moore,
Peter C. de Ruiter,
H. William Hunt,
David C. Coleman,
Diana W. Freckman,
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PDF (1134KB)
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ISSN:0012-9658
DOI:10.2307/2265494
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 9. |
Utilization of Substitutable Carbon and Phosphorus Sources by the Mixotrophic Chrysophyte Ochromonas Sp |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 706-715
Karl O. Rothhaupt,
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摘要:
In laboratory experiments, I studied the influences of bacterial density and light on the ingestion and growth rates, pigment contents, and the carbon and phosphorus turnover rates of the mixotrophic flagellate Ochromonas sp. The investigated strain is a bacterivorous flagellate that can enhance its photosynthetic apparatus and grow phototrophically when bacterial densities are low. This was also evident from significantly higher chlorophyll $a$ contents during active photosynthetic growth phases. Moderate phototrophic growth should be possible even if bacteria were absent. Bacterial ingestion rates increased hyperbolically with bacterial density, and there was no difference between light— and dark—adapted cells. Ochromonas released soluble reactive phosphorus (SRP) when growth was predominantly phagotrophic, but it took up SRP when growth was phototrophic. The mixotrophic strategy in Ochromonas appears to be bound up with costs and trade—offs: Ochromonas needs high bacterial densities to reach maximum growth rates, its basic metabolic costs are higher than for obligately phagotrophic flagellates, and its phototrophic growth rates are lower than for obligately phototrophic phytoplankton of comparable size.
ISSN:0012-9658
DOI:10.2307/2265495
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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| 10. |
Laboratorary Experiments with a Mixotrophic Chrysophyte and Obligately Phagotrophic and Photographic Competitors |
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Ecology,
Volume 77,
Issue 3,
1996,
Page 716-724
Karl O. Rothhaupt,
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摘要:
Mixotrophic flagellates can compete with obligately heterotrophic flagellates for the uptake of food particles, whereas mixotrophs and obligately phototrophic phytoplankton can compete for soluble nutrients. Competition for soluble nutrients is expected when photosynthesis covers a significant portion of the mixotrophs' carbon metabolism. When heterotrophy predominates, however, mixotrophs may release soluble nutrients and facilitate phototrophs. Mechanistic resource competition theory predicts that, due to their ability to utilize substitutable C and P sources, mixotrophs should be able to coexist with their more specialized competitors under certain conditions of resource supply. In laboratory experiments, the mixotrophic flagellate Ochromonas excluded heterotrophic flagellates when only phototrophic growth was possible. However, Ochromonas was excluded by heterotrophic flagellates when only phagotrophic growth was possible. Both coexisted when food bacteria and light were supplied simultaneously. Ochromonas coexisted with a P—limited phytoplankter, Cryptomonas sp., when soluble reactive phosphorus (SRP) and bacterial phosphorus were available as alternative P sources. In nature, the mixotrophic strategy may be successful when resources are limiting. This is supported by published data on the occurrence of mixotrophic chrysophytes.
ISSN:0012-9658
DOI:10.2307/2265496
出版商:Ecological Society of America
年代:1996
数据来源: WILEY
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