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S. Skinner - One of the best experts on this subject based on the ideXlab platform.
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does the redfield ratio infer Nutrient Limitation in the macroalga spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (<1–90 μg L−1), a smaller range of soluble P concentrations (5–12 μg L−1), and soluble molar N : P ratios of 0.11– 27. 3. Spirogyra fluviatilis had an optimal molar C : N : P ratio of 1800 : 87 : 1 which differs substantially from the Redfield ratio, and suggests that the latter ratio is not applicable to this macroalga. Concentrations of N and P in the river deviated from the optimal N : P ratio of 87 : 1, inferring Nutrient Limitation of growth. 4. C : P and C : N ratios of S. fluviatilis varied in accordance with general stoichiometric relationships for autotrophs under Nutrient Limitation of growth. Ratios of C : P and C : N increased, respectively, with increased severity of P- and N-Limitation. Additionally, C : P ratios increased with increased N : P ratios, whilst the C : N ratio increased with decreased N : P ratios. The C : N molar ratio however was an insensitive indicator of Nutrient depletion compared with the C : P ratio. Under N-Limitation of growth, luxury amounts of P were stored by S. fluviatilis. 5. In aquatic environments where macroalgae are sufficiently abundant to be sampled, their cellular carbon, nitrogen and phosphorus stoichiometry can be used to infer Nutrient Limitation of growth when their optimal C : N : P ratio is known.
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Does the Redfield ratio infer Nutrient Limitation in the macroalga Spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (
Simon A. Townsend - One of the best experts on this subject based on the ideXlab platform.
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does the redfield ratio infer Nutrient Limitation in the macroalga spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (<1–90 μg L−1), a smaller range of soluble P concentrations (5–12 μg L−1), and soluble molar N : P ratios of 0.11– 27. 3. Spirogyra fluviatilis had an optimal molar C : N : P ratio of 1800 : 87 : 1 which differs substantially from the Redfield ratio, and suggests that the latter ratio is not applicable to this macroalga. Concentrations of N and P in the river deviated from the optimal N : P ratio of 87 : 1, inferring Nutrient Limitation of growth. 4. C : P and C : N ratios of S. fluviatilis varied in accordance with general stoichiometric relationships for autotrophs under Nutrient Limitation of growth. Ratios of C : P and C : N increased, respectively, with increased severity of P- and N-Limitation. Additionally, C : P ratios increased with increased N : P ratios, whilst the C : N ratio increased with decreased N : P ratios. The C : N molar ratio however was an insensitive indicator of Nutrient depletion compared with the C : P ratio. Under N-Limitation of growth, luxury amounts of P were stored by S. fluviatilis. 5. In aquatic environments where macroalgae are sufficiently abundant to be sampled, their cellular carbon, nitrogen and phosphorus stoichiometry can be used to infer Nutrient Limitation of growth when their optimal C : N : P ratio is known.
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Does the Redfield ratio infer Nutrient Limitation in the macroalga Spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (
Melissa Anne Coman - One of the best experts on this subject based on the ideXlab platform.
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Wind‐driven physical processes and sediment characteristics affect the distribution and Nutrient Limitation of nearshore phytoplankton in a stratified low‐productivity lake
Limnology and Oceanography: Fluids and Environments, 2012Co-Authors: Helene Cyr, Melissa Anne ComanAbstract:Wind-driven physical processes are expected to affect the distribution and composition of phytoplankton communities and to determine their access to nearshore Nutrients. We examined the effect of wind-driven physical processes (surface waves, seiching activity) on the distribution of phytoplankton biomass, their growth rate, and Nutrient Limitation. We sampled nearshore and offshore phytoplankton on 11 days during the pre-, early-, mid-, and late-stratification periods. Phytoplankton biomass (measured as chlorophyll concentration) accumulated downwind, but growth rate was usually higher at upwind than at downwind sites. This suggests that the quantity and quality of algal food sources for higher trophic levels may vary in predictable but opposite ways. Wind-driven surface waves and upwelling activity were associated with changes in phytoplankton Nutrient Limitation in nearshore areas, but these differences were site specific. Our results suggest that wind-driven physical processes and sediment characteristics are both important in determining internal Nutrient loading and phytoplankton Nutrient Limitation in nearshore areas. On windy days, Nutrient Limitation of offshore phytoplankton at the lake surface was always related to the conditions found upwind, suggesting rapid exchanges between nearshore and offshore areas. Wind-driven physical processes affect the distribution and Nutrient Limitation of phytoplankton in lakes, and are likely to influence the efficiency of trophic transfers in planktonic communities. These wind-driven processes should be included more specifically into food web models.
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wind driven physical processes and sediment characteristics affect the distribution and Nutrient Limitation of nearshore phytoplankton in a stratified low productivity lake
Limnology and Oceanography, 2012Co-Authors: Helene Cyr, Melissa Anne ComanAbstract:Wind-driven physical processes are expected to affect the distribution and composition of phytoplankton communities and to determine their access to nearshore Nutrients. We examined the effect of wind-driven physical processes (surface waves, seiching activity) on the distribution of phytoplankton biomass, their growth rate, and Nutrient Limitation. We sampled nearshore and offshore phytoplankton on 11 days during the pre-, early-, mid-, and late-stratification periods. Phytoplankton biomass (measured as chlorophyll concentration) accumulated downwind, but growth rate was usually higher at upwind than at downwind sites. This suggests that the quantity and quality of algal food sources for higher trophic levels may vary in predictable but opposite ways. Wind-driven surface waves and upwelling activity were associated with changes in phytoplankton Nutrient Limitation in nearshore areas, but these differences were site specific. Our results suggest that wind-driven physical processes and sediment characteristics are both important in determining internal Nutrient loading and phytoplankton Nutrient Limitation in nearshore areas. On windy days, Nutrient Limitation of offshore phytoplankton at the lake surface was always related to the conditions found upwind, suggesting rapid exchanges between nearshore and offshore areas. Wind-driven physical processes affect the distribution and Nutrient Limitation of phytoplankton in lakes, and are likely to influence the efficiency of trophic transfers in planktonic communities. These wind-driven processes should be included more specifically into food web models.
Julia Schult - One of the best experts on this subject based on the ideXlab platform.
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does the redfield ratio infer Nutrient Limitation in the macroalga spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (<1–90 μg L−1), a smaller range of soluble P concentrations (5–12 μg L−1), and soluble molar N : P ratios of 0.11– 27. 3. Spirogyra fluviatilis had an optimal molar C : N : P ratio of 1800 : 87 : 1 which differs substantially from the Redfield ratio, and suggests that the latter ratio is not applicable to this macroalga. Concentrations of N and P in the river deviated from the optimal N : P ratio of 87 : 1, inferring Nutrient Limitation of growth. 4. C : P and C : N ratios of S. fluviatilis varied in accordance with general stoichiometric relationships for autotrophs under Nutrient Limitation of growth. Ratios of C : P and C : N increased, respectively, with increased severity of P- and N-Limitation. Additionally, C : P ratios increased with increased N : P ratios, whilst the C : N ratio increased with decreased N : P ratios. The C : N molar ratio however was an insensitive indicator of Nutrient depletion compared with the C : P ratio. Under N-Limitation of growth, luxury amounts of P were stored by S. fluviatilis. 5. In aquatic environments where macroalgae are sufficiently abundant to be sampled, their cellular carbon, nitrogen and phosphorus stoichiometry can be used to infer Nutrient Limitation of growth when their optimal C : N : P ratio is known.
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Does the Redfield ratio infer Nutrient Limitation in the macroalga Spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (
Michael M. Douglas - One of the best experts on this subject based on the ideXlab platform.
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does the redfield ratio infer Nutrient Limitation in the macroalga spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (<1–90 μg L−1), a smaller range of soluble P concentrations (5–12 μg L−1), and soluble molar N : P ratios of 0.11– 27. 3. Spirogyra fluviatilis had an optimal molar C : N : P ratio of 1800 : 87 : 1 which differs substantially from the Redfield ratio, and suggests that the latter ratio is not applicable to this macroalga. Concentrations of N and P in the river deviated from the optimal N : P ratio of 87 : 1, inferring Nutrient Limitation of growth. 4. C : P and C : N ratios of S. fluviatilis varied in accordance with general stoichiometric relationships for autotrophs under Nutrient Limitation of growth. Ratios of C : P and C : N increased, respectively, with increased severity of P- and N-Limitation. Additionally, C : P ratios increased with increased N : P ratios, whilst the C : N ratio increased with decreased N : P ratios. The C : N molar ratio however was an insensitive indicator of Nutrient depletion compared with the C : P ratio. Under N-Limitation of growth, luxury amounts of P were stored by S. fluviatilis. 5. In aquatic environments where macroalgae are sufficiently abundant to be sampled, their cellular carbon, nitrogen and phosphorus stoichiometry can be used to infer Nutrient Limitation of growth when their optimal C : N : P ratio is known.
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Does the Redfield ratio infer Nutrient Limitation in the macroalga Spirogyra fluviatilis
Freshwater Biology, 2008Co-Authors: Simon A. Townsend, Julia Schult, Michael M. Douglas, S. SkinnerAbstract:Summary 1. The cellular Nutrient contents of microalgae, when growing at or approaching maximum rates, approximate the Redfield C : N : P (molar) ratio of 106 : 16 : 1. Deviations from this optimal ratio can be used to infer Nutrient Limitation of microalgal growth. However, this ratio may not be applicable to macroalgae, which are distinguished from microalgae by forming a thallus that is a discrete structure visible to the naked eye. The utility of the Redfield ratio to infer Nutrient Limitation of the growth of macroalgae was tested for Spirogyra fluviatilis in a field experiment conducted in tropical Australia. 2. The optimal cellular C : N : P ratio for S. fluvialitis was estimated by means of in situ Nutrient addition. This was compared with S. fluvialitis cellular ratios determined from eight sites with a wide range of soluble N concentrations (
