Field Study Comparing Growth and Viability of a Population of Phototrophic Bacteria

Folt, Carol L.; Wevers, Mary Jo; Yoder-Williams, Michael P.; Howmiller, Richard P.

doi:10.1128/aem.55.1.78-85.1989

Cited by 18 publications

(10 citation statements)

References 27 publications

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“…The Thiopedia from Zaca Lake, California, averaged 8 ,um3 per cell (Folt et al 1989); Lamprocystis from Deadmoose Lake, Saskatchewan, ranged from 10 to 15 pm3 per cell (Parker and Hammer 1983). The largest bacteria we counted were almost two orders of magnitude smaller than these.…”

Section: Discussionmentioning

confidence: 70%

Bacterial biomass and cell size distributions in lakes: More and larger cells in anoxic waters

Cole

Pace

Caraco

et al. 1993

Limnology & Oceanography

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We measured bacterial abundance, cell size distribution, and related microbiological and geochemical parameters in 20 stratified lakes from three regions in the U.S. Both largest cell size and greatest bacterial abundance occurred in anoxic waters. Bacterial size distributions from the hypolimnia of lakes that were oxic were identical to those in surface waters. Bacteria from anoxic hypolimnia were 2-10 times larger than those from oxic water and cell size was independent of temperature under either oxic or anoxic conditions. For all lakes and strata, bacterial abundance was strongly related to the concentration of total phosphorus (TP). Cell size was not related to TP or to bacterial abundance, suggesting that abundance and size may be regulated by different processes. Bacterial biomass (calculated from the product of mean cell size and bacterial abundance) was typically 4 times greater in anoxic than in oxic waters of lakes.

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Section: Discussionmentioning

confidence: 70%

Bacterial biomass and cell size distributions in lakes: More and larger cells in anoxic waters

Cole

Pace

Caraco

et al. 1993

Limnology & Oceanography

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“…Study lake-Zaca Lake is a warm, monomictic lake situated in the San Rafael mountains of southern California (elevation, 730 m asl). The lake is small (7 ha), steep-sided (max depth, 13 m) and well protected, with persistent thermal stratification for -10 months of the year (Folt et al 1989). The lake is fed by mineral springs, some of which are high in H2S and P. As a consequence, it is naturally eutrophic and high in dissolved ions, particularly Mg2+, SOJ2-, Ca2+, and C032-(J. Melack and F. Setaro unpubl.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, deoxygenation of the entire water column can occur during winter mixis (Folt et al 1989), resulting in fish kills. A fish kill apparently occurred during winter 1989-1990 because densities of Lepomis cyanel-Zus, the lake's primary planktivore, were drastically reduced in 1990 (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Contrasting effects of Daphnia on ratios of nitrogen to phosphorus in a eutrophic, hard‐water lake

Sarnelle

1992

Limnology & Oceanography

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Daphnia manipulation in large enclosures, and whole-lake observations before and after a fishkill, showed that intense Daphnia grazing produces large elevations in particulate N : P ratios (PN : PP) during clear-water periods in a eutrophic lake. The direction of this effect was consistent with expected taxonomic variation among zooplankton in the N : P of excretion.N and P sedimentation (mg m-2 d-l) was reduced during Daphnia-induced, clear-water periods, despite increases in particle sinking velocities. In addition, there was an unexpected difference between seston N : P and the N : P of settled particles during clear water, resulting in a d@zrential increase in average sinking velocity calculated for PP relative to PN.Daphnia effects on N: P later in the season appeared to be opposite to those during clear water. My data suggest that Daphnia grazing can reduce carbonate precipitation (whitings) by controlling algal biomass. Whitings were accompanied by large increases in sedimentary loss rates for total P (TP) and elevated TN: TP in the euphotic zone. Thus, Daphnia grazing may maintain relatively low TN : TP during summer in eutrophic, hard-water lakes.

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“…Zaca Lake is situated at an elevation of 730 m in the San Rafael mountains of southern California. The lake is small (7 ha), steep-sided (maximum depth, 13 m), and protected from the wind, with persistent thermal stratification for ഠ10 mo of the year (Folt et al 1989). The lake is fed by mineral springs, some of which are high in hydrogen sulfide and phosphorus.…”

Section: Study Lakementioning

confidence: 99%

“…During stratification, large amounts of hydrogen sulfide accumulate in the hypolimnion. This leads to deoxygenation of the water column when the lake mixes in December and January (Folt et al 1989), sometimes resulting in a fish kill. A fish kill apparently occurred during the winter of 1989-1990 because densities of green sunfish (Lepomis cyanellus), the lake's primary zooplanktivore, were drastically reduced in 1990 relative to 1989 (Sarnelle 1993).…”

Section: Study Lakementioning

confidence: 99%

Daphnia Effects on Microzooplankton: Comparisons of Enclosure and Whole- Lake Responses

Sarnelle¹

1997

Ecology

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The effects of the herbivorous zooplankter, Daphnia, on a natural community of microzooplankton (rotifers, ciliates, and nanoflagellates) were compared in enclosures of two sizes (15 and 10 000 L) and in a eutrophic lake before and after a fish kill. The magnitude of Daphnia's effect on microzooplankton taxa varied quantitatively and qualitatively between experiments. The rotifer Synchaeta pectinata and the ciliate, Didinium sp., showed extreme differences between experiments, exhibiting opposite responses in small vs. large enclosures. The relative rankings of responses for two rotifers (Polyarthra dolichoptera and Synchaeta pectinata) and two ciliates (Coleps sp. and Didinium sp.) were reversed in small vs. large enclosures. Polyarthra was depressed by Daphnia more than Synchaeta in small enclosures, while Synchaeta was depressed more than Polyarthra in the large enclosures. Didinium was depressed more than Coleps in the small enclosures, while the reverse occurred in large enclosures.Microzooplankton responses also changed over time in the large-enclosure experiment. Daphnia significantly suppressed total ciliate dry biomass, but not total rotifer biomass after 6 d, but suppressed dry biomass of both groups by the end of the 23-d experiment. This result may reflect changes in the relative importance of Daphnia's predatory and competitive effects over time. Daphnia's effects on the rotifers, Polyarthra and Hexarthra mira, took 3 wk to be expressed but were very strong by the end of the large-enclosure experiment, suggesting that short-term experiments may underestimate competitive effects. Polyarthra's delayed response was associated with a delayed response of cryptophytes to the Daphnia manipulation.Comparisons of enclosure results with temporal correlations in lake data and with microzooplankton abundances before and after a fish kill indicated better congruence between lake data and the large-enclosure results. More importantly, large-enclosure results agreed more closely with whole-lake dynamics than with small-enclosure results. Consequently, large-scale enclosure experiments may provide reliable predictions of whole-lake phenomena, but small-scale (microcosm) experiments may not.

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Field Study Comparing Growth and Viability of a Population of Phototrophic Bacteria

Cited by 18 publications

References 27 publications

Bacterial biomass and cell size distributions in lakes: More and larger cells in anoxic waters

Bacterial biomass and cell size distributions in lakes: More and larger cells in anoxic waters

Contrasting effects of Daphnia on ratios of nitrogen to phosphorus in a eutrophic, hard‐water lake

Daphnia Effects on Microzooplankton: Comparisons of Enclosure and Whole- Lake Responses

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