Eleven- and ten-year basic cycles of Lake Baikal spring phytoplankton conformed to solar activity cycles

Бондаренко, Н. А.; Evstafyev, Vladimir K.

doi:10.1007/s10750-006-0339-1

Cited by 16 publications

(12 citation statements)

References 4 publications

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“…There is evidence that variations in solar activity affect different biological processes including pelagic fisheries yields (Guisande et al, 2004), recruitment of fish populations (Santos et al, 2012) and phytoplankton cycles (Bondarenko and Evstafyev, 2006).…”

Section: Interannual Climate Variability and Trends In Dinophysis Popmentioning

confidence: 99%

Climate variability and Dinophysis acuta blooms in an upwelling system

et al. 2016

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Dinophysis acuta is a frequent seasonal lipophilic toxin producer in European Atlantic coastal waters associated with thermal stratification. In the Galician Rías, populations of D. acuta with their epicentre located off Aveiro (northern Portugal), typically co-occur with and follow those of Dinophysis acuminata during the upwelling transition (early autumn) as a result of longshore transport. During hotter than average summers, D. acuta blooms also occur in August in the Rías, when they replace D. acuminata. Here we examined a 30-year (1985-2014) time series of D. acuta from samples collected by the same method in the Galician Rías. Our main objective was to identify patterns of distribution and their relation with climate variability, and to explain the exceptional summer blooms of D. acuta in 1989-1990. A dome-shaped relationship was found between summer upwelling intensity and D. acuta blooms; cell maxima were associated with conditions where the balance between upwelling intensity and heating, leading to deepened thermoclines, combined with tidal phase (3 days after neap tides) created windows of opportunity for this species. The application of a generalized additive model based on biological (D. acuta inoculum) and environmental predictors (Cumulative June-August upwelling CUI, average June-August SST and tidal range) explained more than 70% of the deviance for the exceptional summer blooms of D. acuta, through a combination of moderate (35,000-50,000mskm) summer upwelling (CUI), thermal stratification (SST>17°C) and moderate tidal range (∼2.5m), provided D. acuta cells (inoculum) were present in July. There was no evidence of increasing trends in D. acuta bloom frequency/intensity nor a clear relationship with NAO or other long-term climatic cycles. Instead, the exceptional summer blooms of 1989-1990 appeared linked to extreme hydroclimatic anomalies (high positive anomalies in SST and NAO index), which affected most of the European Atlantic coast.

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Section: Interannual Climate Variability and Trends In Dinophysis Popmentioning

confidence: 99%

Climate variability and Dinophysis acuta blooms in an upwelling system

et al. 2016

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“…Despite that, under-ice phytoplankton can be surprisingly abundant (e.g., Rodhe 1955;Bondarenko and Evstafyev 2006) and that is why Rodhe (1955) suggested that phytoplankton must largely rely on heterotrophic metabolism. Numerous laboratory and field experiments have demonstrated a heterotrophic capability in diverse taxonomic groups of algae.…”

Section: Coupling Of Physical and Biologic Processes Under Icementioning

confidence: 99%

Perspectives in winter limnology: closing the annual cycle of freezing lakes

et al. 2009

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Winter has traditionally been considered as an ecologically insignificant season and, together with technical difficulties, this has led winter limnology to lag behind summer limnology. Recently, rapidly expanding interest in climate warming has increased water research in winter. It has also become clear that neither winter conditions of lakes nor underice communities are as static as often supposed. Although interannual differences in water temperature are small, close to the maximum density temperature, they may have profound effect on under-ice hydrodynamics. Thus, stochastic variations in weather, particularly those preceding the time of freezing and ice melting, may have important consequences for hydrodynamics which then affect the distributions and conditions of microorganisms and probably further to higher trophic levels. Even fish distributions can be dictated by under-ice conditions and their activities as well as behavior can sometimes approach those in summer. Life in freshwater ice is one of the least studied aspects of winter limnology and recent studies suggest that a thorough evaluation is needed. Altogether there are strengthening signs that winter should be considered as an integral part in the functioning and dynamics of lakes affecting quantitative and qualitative characteristics of aquatic communities in summer. There are great prospects that more thorough understanding of the prevailing limnological conditions in winter will improve our understanding of lake ecosystems in their entirety, and there is no doubt that such an approach requires multidisciplinary and long-term studies at different spatial scales.

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“…Pettersson 1990;Padiśak et al 1998;Lotter and Bigler 2000), can also be abundant. In Lake Baikal, a large diatom, Aulacoseira baicalensis, is often the main component of under-ice phytoplankton (Kozhova 1987;Jewson et al 2009) and in March of some years this diatom develops distinct blooms (Kozhov 1963;Bondarenko and Evstafyev 2006).…”

Section: Introductionmentioning

confidence: 99%

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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Eleven- and ten-year basic cycles of Lake Baikal spring phytoplankton conformed to solar activity cycles

Cited by 16 publications

References 4 publications

Climate variability and Dinophysis acuta blooms in an upwelling system

Climate variability and Dinophysis acuta blooms in an upwelling system

Perspectives in winter limnology: closing the annual cycle of freezing lakes

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

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