Production and Nutrient Supply of Phytoplankton in Subarctic, Dimictic Thingvallavatn, Iceland

Jónasson, Pétur M.; Aðalsteinsson, Hákon; Jónsson, Gunnar St.

doi:10.2307/3545051

Cited by 26 publications

(11 citation statements)

References 40 publications

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“…in L. Pääjärvi in mid-April at 60-70 m depths than in other strata may reflect its appearance from the sediment, possibly coupled with transport from shallower areas. Jónasson et al (1992) observed similar higher densities in deep water of L. Thingvallavatn, although their data were equally limited as in this study.…”

Section: Taxonsupporting

confidence: 60%

“…The winter dominance of cryptophytes, chrysophytes and diatoms in L. Pääjärvi is in agreement with L. Päijänne (Kiili et al 2009) as well as with Swedish (Rodhe 1955) and Siberian (Mitrofanova et al 2007) oligotrophic lakes. Notably Aulacoseira diatoms are dominant in the under-ice phytoplankton of L. Baikal (Kozhova 1987;Jewson et al 2009), Thingvallavatn (Jónasson et al 1992), Köyliönjärvi (Ventelä et al 1998) and Päijänne (Kiili et al 2009). …”

Section: Taxonmentioning

confidence: 98%

“…25 m deep) lakes (Nauwerck 1968;Fott et al 1999). Jónasson et al (1992) found uniform distribution of Aulacoseira in 114-m deep L. Thingvallavatn (83 km 2 , ca. six times larger than L. Pääjärvi) where this diatom represented [90% of phytoplankton biomass.…”

Section: Taxonmentioning

confidence: 99%

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Development of phytoplankton in Lake Pääjärvi (Finland) during under-ice convective mixing period

Vehmaa

Salonen

2009

Aquat Ecol

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The development of winter phytoplankton communities was studied in both shallow and deep areas of Lake Pääjärvi, southern Finland, during the final 2 weeks of winter ice cover. Phytoplankton was mainly composed of diatoms, cryptophytes and chrysophytes. The diatoms Aulacoseira and Rhizosolenia were always uniformly distributed with depth, initially probably due to mixing induced by heat flux from the sediment and later due to thermal convection. Motile Rhodomonas cryptophytes and Chrysococcus chrysophytes were most abundant near the ice showing that, despite their small size, they were partly able to resist mixing by convection. Their ability to stay in more illuminated water layers was reflected in net rates of increase about an order of magnitude higher than those of diatoms in the middle of the lake. Given the low temperatures and convection, the observed net rates of increase of motile taxa were very high compared to growth rates reported in the literature. The gradual increase in light availability following melting of ice led to a consistent increase in the abundances of major phytoplankton taxa irrespective of deep convective circulation. It is suggested that those algae most abundant at the time of ice break have a competitive advantage in the following open water conditions when nutrients are abundant but deep water circulation limits light availability. The results emphasize that in lakes which cool below the maximum density of water before freezing, apparently small differences in temperature and light conditions can cause important changes in the circulation patterns that impact on phytoplankton development.

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Section: Taxonsupporting

confidence: 60%

Section: Taxonmentioning

confidence: 98%

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Development of phytoplankton in Lake Pääjärvi (Finland) during under-ice convective mixing period

Vehmaa

Salonen

2009

Aquat Ecol

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“…The water level has been regulated since 1959, and the pattern of water level fluctuations before and after are discussed by Adalsteinsson et al (1992). The water level has been regulated since 1959, and the pattern of water level fluctuations before and after are discussed by Adalsteinsson et al (1992).…”

Section: Physical Characteristicsmentioning

confidence: 99%

“…On an average, the ice-cover lasted 95 d during the period 1974 to 1990 (Adalsteinsson et al 1992). Values from PAR measurements and solar radiation estimates show fairly consistent results.…”

Section: Physical Characteristicsmentioning

confidence: 99%

The Ecosystem of Thingvallavatn: A Synthesis

Jónasson¹

1992

Oikos

Self Cite

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Changes in Physical and Chemical Limnology and Plankton during the Spring Melt Period in a Subarctic Lake

Forsström¹,

Sorvari

Rautio

et al. 2007

International Review of Hydrobiology

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The springtime limnology of subarctic Lake Saanajärvi, NW Finnish Lapland, was studied in 1999 with particular interest on the estimation of the effects of acid pulse. No clear pH depression was seen during the study year with exceptionally thin snow cover, in contrast to the year 1997, when a clear episodic decline in surface water pH was measured. In contrast to many Arctic lakes, no phytoplankton spring bloom was observed, probably because of the combination of low nutrient concentrations, dilution effect, flushing and rapid change in light climate. Low temperatures and limited food resources, resulting in long life cycles of zooplankton and with a clear winter maximum, may be the main factor controlling the atypical succession of zooplankton in Lake Saanajärvi.

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Production and Nutrient Supply of Phytoplankton in Subarctic, Dimictic Thingvallavatn, Iceland

Cited by 26 publications

References 40 publications

Development of phytoplankton in Lake Pääjärvi (Finland) during under-ice convective mixing period

Development of phytoplankton in Lake Pääjärvi (Finland) during under-ice convective mixing period

The Ecosystem of Thingvallavatn: A Synthesis

Changes in Physical and Chemical Limnology and Plankton during the Spring Melt Period in a Subarctic Lake

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