Growth rates and the salinity response of an Antarctic ice microflora community

Vargo, Gabriel A.; Fanning, Kent A.; Heil, Cynthia A.; Bell, Lauren E.

doi:10.1007/bf00446092

Cited by 32 publications

(15 citation statements)

References 15 publications

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“…The physiological activity of sea ice microalgae is known to be sensitive to changes in ambient salt concentrations, with reductions in photosynthetic effi ciency, photosynthetic capacity and growth rate as salinity diverges further from sea water values (Bunt, 1964;Grant & Horner, 1976;Bates & Cota, 1986;Vargo et al, 1986, Kottmeier & Sullivan, 1988Arrigo & Sullivan, 1992;Krell et al, 2007). Recently, Ralph et al (2007) extended these observations and found that sea ice algae exposed to extreme salinities exhibited substantial closure of photosystem II (PSII) reaction centres when irradiance was applied.…”

Section: Response To Salinitymentioning

confidence: 58%

“…Salinity stress may result in limited reduction of the primary electron receptor and the plastoquinone pool, which ultimately inhibits both quantum yield of PSII and electron transport . However, studies investigating either short-term (minutes) photosynthetic responses (Bates & Cota, 1986) or very long-term (weeks) growth responses (Grant & Horner, 1976;Vargo et al, 1986) have shown that acclimation to either high or low salinity is possible. For instance, Vargo et al (1986) reported that microalgae were capable of adapting their growth rates fully within 1-2 weeks after introduction to salinity regimes ranging from 19.5 to 31.5 while Grant and Horner (1976) reported similar observations over a much wider range of salinities (5-60).…”

Section: Response To Salinitymentioning

confidence: 99%

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Primary Producers and Sea Ice

Arrigo

Möck

Lizotte

2009

Sea Ice

116

167

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Section: Response To Salinitymentioning

confidence: 58%

Section: Response To Salinitymentioning

confidence: 99%

Primary Producers and Sea Ice

Arrigo

Möck

Lizotte

2009

Sea Ice

116

167

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“…3a) and the last 2 P-I experiments were made on sloughed populations. Low salinities are known to affect growth (Grant & Horner 1976, Vargo et al 1986) as well as fluorescence and photosynthesis (Bates & Cota 1986) of ice algae. The failure of the algae to attain higher levels of biomass (Fig.…”

Section: Ice Algal Response To Lightmentioning

confidence: 99%

Physical control of arctic ice algal production

Cota¹,

Home²

1989

Mar. Ecol. Prog. Ser.

104

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Algal colonization of annual sea ice in the hlgh Arctic approximates plate culture. presenting a model system for physiological studies of natural populations of marine microalgae. Time series of observations were made in the Northwest Passage during the latter half of the spring bloom. Although in situ temperature, salinity and irradiance were nearly constant, the photosynthetic performance of ice algae as indicated by maximum assimilation rates (pmB, mg C mg chl-' h-') and photosynthetic efficiencies ( a , nlg C mg chl-' h-' (p E m-' s-')-') displayed large, low-frequency fluctuations.In contrast, the photoadaptive index, Ik (LIE m-* S-'), varied little up until the last few days of our study when snow cover melted and transmitted light increased rapidly. When compared to cells from other snow covers or light histories, algal populations from a snow-free area exhibited higher asslmdation rates and photoadaptive indices but had similar photosynthetic efficiencies and lower standing stocks. Nutrient fluxes in the 'surface mixed layer' also varied by about an order of magnitude over the fortnightly tidal cycle. Tidally dominated vertical mixing results in a pulsed nutrient regime which is apparently reflected in a modulation of algal photosynthesis and growth.

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“…Knowledge of the primary production rate is of great importance to fisheries through energy transfer in the marine food chain. Production can be regulated by Light (Grainger 1979, Horner 1981, Demers et al 1984, Horner 1985, temperature (Bunt 1968, Neon & Holm-Hansen 1982, salinity , Poulin et al 1983, Vargo et al 1986), nutrients and water column stability (Dunbar 1970, Legendre 1981. Recently, auxiliary factors such as freshwater runoff, tides, winds and air-water heat exchanges (Gosselin et al 1985 have also been considered important.…”

Section: Introductionmentioning

confidence: 99%

Spatial and seasonal variations in primary production of sea ice microalgae and phytoplankton in Frobisher Bay, Arctic Canada

Hsiao¹

1988

Mar. Ecol. Prog. Ser.

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ABSTRACT. Spatial and seasonal variations in primary production by sea ice microalgae and phytoplankton in Frobisher Bay were studied from 1976 to 1986. Sea ice microalgae grew from late winter to spring. Maximal production of 2.0 mg C m-3 h-' (12 mg C m-' h-') was reached in late spring when a microalgal bloom occurred in the bottom 5 cm of the ice. At the same time, photosynthetic production rates of phytoplankton in the water under the ice began to increase but were generally several times lower than those within the ice. The greatest rate of carbon production in the water column was 4 mg C m-3 h-' (55 mg C m-'h-'), reached during the summer. The phytoplankton bloom took place in the upper 10 m where the pycnocline existed. Production decreased after the summer through the fall and winter. The most important factors governing primary production of the microalgae in the upper part of the sea ice were the combined effects of light and temperature. Light alone was the most important factor for the bottom ice microalgae and the phytoplankton in the water column under the ice and in the lower parts of the euphotic zone during open water seasons. Nutrients were never limiting during this study. Evidence is given for the important role of such auxiliary factors as salinity changes, tides, airwater heat exchanges and winds in generating vertical mixing, either alone or in combination with light, ir. regulating !he !imc and iiiagiiitiide of Ll~e 'uioom.

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Growth rates and the salinity response of an Antarctic ice microflora community

Cited by 32 publications

References 15 publications

Primary Producers and Sea Ice

Primary Producers and Sea Ice

Physical control of arctic ice algal production

Spatial and seasonal variations in primary production of sea ice microalgae and phytoplankton in Frobisher Bay, Arctic Canada

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