Crossref journal-article
Wiley
Freshwater Biology (311)
Abstract

SUMMARY1. The influence of inorganic nitrogen and phosphorus enrichment on phytoplankton photosynthesis was investigated in Lakes Bonney (east and west lobes), Hoare, Fryxell and Vanda, which lie in the ablation valleys adjacent to McMurdo Sound, Antarctica. Bioassay experiments were conducted during the austral summer on phytoplankton populations just beneath the permanent ice cover in all lakes and on populations forming deep‐chlorophyll maxima in the east and west lobes of Lake Bonney.2. Phytoplankton photosynthesis in surface and mid‐depth (13 m) samples from both lobes of Lake Bonney were stimulated significantly (P < 0.01) by phosphorus enrichment (2 μM) with further stimulation by simultaneous phosphorus plus NH4+ (20 μM) enrichment. Similar trends were observed in deeper waters (18 m) from the east lobe of Lake Bonney, although they were not statistically significant at P < 0.05. Photosynthesis in this lake was never enhanced by the addition of 20 μM NH4+ alone. Simultaneous addition of phosphorus plus nitrogen stimulated photosynthesis significantly (P < 0.01) in both Lake Hoare and Lake Fryxell. No nutrient response occurred in Lake Vanda, where activity in nutrient‐enriched samples was below unamended controls; results from Lake Vanda are suspect owing to excessively long sample storage in the field resulting from logistic constraints.3. Ambient dissolved inorganic nitrogen (DIN) (NH4++ NO2−+ NO3−): soluble reactive phosphorus (SRP) ratios partially support results from bioassay experiments indicating strong phosphorus deficiency in Lake Bonney and nitrogen deficiency in Lakes Hoare and Fryxell. DIN : SRP ratios also imply phosphorus deficiency in Lake Vanda, although not as strong as in Lake Bonney. Particulate carbon (PC): particulate nitrogen (PN) ratios all exceed published ratios for balanced phytoplankton growth, indicative of nitrogen deficiency.4. Vertical nutrient profiles in concert with low advective flux, indicate that new (sensu Dugdale & Goering, 1967) phytoplankton production in these lakes is supported by upward diffusion of nutrients from deep nutrient pools. This contention was tested by computing upward DIN : SRP flux ratios across horizontal planes located immediately beneath each chlorophyll maximum and about 2 m beneath the ice (to examine flux to the phytoplankton immediately below the ice cover). These flux ratios further corroborated nutrient bioassay results and bulk DIN : SRP ratios indicating phosphorus deficiency in Lakes Bonney and Vanda and potential nitrogen deficiency in Lakes Hoare and Fryxell.5. Neither biochemical reactions nor physical processes appear to be responsible for differences in nutrient deficiency among the study lakes. The differences may instead be related to conditions which existed before or during the evolution of the lakes.

Bibliography

PRISCU, J. C. (1995). Phytoplankton nutrient deficiency in lakes of the McMurdo dry valleys, Antarctica. Freshwater Biology, 34(2), 215–227. Portico.

Authors 1
  1. JOHN C. PRISCU (first)
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Dates
Type When
Created 19 years, 3 months ago (May 30, 2006, 7:33 p.m.)
Deposited 1 year, 10 months ago (Oct. 26, 2023, 5:28 p.m.)
Indexed 1 day, 1 hour ago (Sept. 2, 2025, 6:38 a.m.)
Issued 29 years, 11 months ago (Oct. 1, 1995)
Published 29 years, 11 months ago (Oct. 1, 1995)
Published Online 19 years, 3 months ago (May 30, 2006)
Published Print 29 years, 11 months ago (Oct. 1, 1995)
Funders 0

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@article{PRISCU_1995, title={Phytoplankton nutrient deficiency in lakes of the McMurdo dry valleys, Antarctica}, volume={34}, ISSN={1365-2427}, url={http://dx.doi.org/10.1111/j.1365-2427.1995.tb00882.x}, DOI={10.1111/j.1365-2427.1995.tb00882.x}, number={2}, journal={Freshwater Biology}, publisher={Wiley}, author={PRISCU, JOHN C.}, year={1995}, month=oct, pages={215–227} }