Temporal dynamics and spatial variation of algae in relation to hydrology and sediment characteristics in the Okefenokee Swamp, Georgia

Schoenberg, Steven A.; Oliver, J. Douglas

doi:10.1007/bf00014534

Cited by 18 publications

(9 citation statements)

References 40 publications

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“…Equilibrium phosphate concentration of the sediment complex was elevated at the abandoned rookery, and levels of phytoplankton were correspondingly elevated. These field results are corroborated by results from laboratory experiments, which indicated that sediments from the abandoned rookery released more PO4-P to overiying water than sediments from other Okefenokee marshes, and overlying phytoplankton were then increased to greater levels (Schoenberg and Oliver 1988). Experimental enrichment of Okefenokee corrals corresponding to levels left after birds had abandoned the site caused elevation of zooplankton primary consumers.…”

Section: Possible Positive Feedbacks In the Systemsupporting

confidence: 58%

Residual Influence of Macronutrient Enrichment on the Aquatic Food Web of an Okefenokee Swamp Abandoned Bird Rookery

Oliver¹,

Schoenberg²

1989

Oikos

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Residual influence of macronutrient enrichment on the aquatic food web of an Okefenokee Swamp abandoned bird rookery" (1989 We present evidence for residual nutrient enrichment of diverse components of a blackwater marsh, by a biotic component of the ecosystem itself. Thousands of nesting white ibis (Eudocimus albus) that foraged over a 20-km radius fertilized a rookery with guano within Okefenokee Swamp. Georgia. USA. One to two yr after the birds abandoned it. this marsh showed continued enrichment effects. Elevated available phosphorus in sediments, as measured by equilibrium phosphate concentration, contributed to enhanced biomass of phytoplankton in the overlying water column. Planktivorous fish were greater in biomass than at reference sites. Experimental phosphorus and nitrogen fertilization of enclosures at a reference site (at levels representing residual enrichment after birds had left) caused zooplankton biomass to increase significantly. These results demonstrate that this blackwater ecosystem was macronutrient limited, and manifested residual enrichment effects of wading birds on sediments, and a positive effect of sediments on phytoplankton. Results also suggest further indirect positive effects of birds on higher trophic levels (zooplankton and fish), via macronutrient transfers.

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Section: Possible Positive Feedbacks In the Systemsupporting

confidence: 58%

Residual Influence of Macronutrient Enrichment on the Aquatic Food Web of an Okefenokee Swamp Abandoned Bird Rookery

Oliver¹,

Schoenberg²

1989

Oikos

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“…Fabre (1988) and Schomberg & Oliver (1988), showed that drawdown increased P release during refiling the reservoir. Within Embalse del Rio Tercero Reservoir, mineralization of sedimentary organic matter during drawdown was coupled with enhancement of nutrient cycling by breeding cattle in the newly developed prairies.…”

Section: Discussionmentioning

confidence: 99%

Impact of a nuclear power plant on water quality of Embalse del Río Tercero Reservoir, (Córdoba, Argentina)

et al. 1992

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We studied the water quality of Embalse del Rio Tercero Reservoir after the building of a nuclear power plant, completed in 1983, and compare the results with available information for the period before the plant started operating. At present, the reservoir is eutrophic. It has a period of stratification in spring and summer and it is fully mixed in fall and winter. Seasonal variations are large. Diatoms are dominant during homothermous periods, while primary production seems to be light-limited. Aphanocapsa sp. is dominant during periods of stratification, at the end of which nutrient exhaustion (specially inorganic nitrogen) limits production. At present, mean inorganic nitrogen, total phosphorus and chlorophyll concentrations are lower than before the power plant started operating. It is suggested that this improvement in water quality is due to a change in water management. Extensive drawdown of the reservoir was allowed before 1983. Since large volumes of water are required for cooling purposes in the nuclear power plant, water level fluctuations have strongly diminished. Changes of colonization in Elodea sp. and fish composition have also been observed.

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“…6A). As little as 1 7% of total bacterial biomass could be supported by aboveground lignocellulose inputs in summer months, although carbon sources such as algae and plant exudates are also available at this time of the year Hodson 1986, Schoenberg andOliver 1988). As much as 100% of bacterial biomass could be derived from lignocellulosic carbon during the winter.…”

Section: Discussionmentioning

confidence: 99%

“…(B) Comparison of protozoan and meiofaunal biomass predicted to be derived from microbially degraded lignocellulose (--) to protozoan and meiofaunal biomass determined from A TP measurements of water and sediments of Mizell Prairie from April 1982 to July 1983 (e; Moran et al 1987). Biomass attributable to bacteria (direct counts) and biomass attributable to algae (chlorophyll measurements; Schoenberg and Oliver, 1988) were substracted from total ATP biomass to calculate protozoan and smallanimal biomass. enfold increase in total bacterial carbon in Mizell Prairie from winter to summer (Moran eta!.…”

Section: Discussionmentioning

confidence: 99%

Carbon Flow From Lignocellulose: A Simulation Analysis of a Detritus‐Based Ecosystem

Moran¹,

Legović²,

Benner³

et al. 1988

Ecology

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A simulation model is used to predict the fate of carbon derived from lignocellulose in the food web of a marsh community in the Okefenokee Swamp, Georgia. The model, constructed from empirical work spanning a 6—yr period, predicts the role of lignocellulose—derived detritus in supporting secondary production in this ecosystem. Although Carex walteriana lignocellulose is the dominant product of primary production in this marsh and the dominant source of detritus, the model predicts that it may not be quantitatively important in the support of tropic groups other than bacteria and protozoa. The efficiency of transfer lignocellulosic carbon through the microbial loop is low, and overall only 8% of the carbon used by bacteria and fungi is predicted to be ingested subsequently by metazoans. An average of 32% of the bacterial biomass in the marsh water and sediments is predicted by the model to be produced at the expense of lignocellulosic carbon, whereas <10% of the biomass of larger detritivorous animals can be traced to carbon from lignocellulose. Thus in this marsh ecosystem, detritus food webs based on other, less abundant, sources of detrital carbon, or perhaps classical plant—herbivore food webs, are more likely to be the major source of carbon for metazoan production.

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Temporal dynamics and spatial variation of algae in relation to hydrology and sediment characteristics in the Okefenokee Swamp, Georgia

Cited by 18 publications

References 40 publications

Residual Influence of Macronutrient Enrichment on the Aquatic Food Web of an Okefenokee Swamp Abandoned Bird Rookery

Residual Influence of Macronutrient Enrichment on the Aquatic Food Web of an Okefenokee Swamp Abandoned Bird Rookery

Impact of a nuclear power plant on water quality of Embalse del Río Tercero Reservoir, (Córdoba, Argentina)

Carbon Flow From Lignocellulose: A Simulation Analysis of a Detritus‐Based Ecosystem

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