Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Pannard, Alexandrine; Bormans, Myriam; Lagadeuc, Yvan

doi:10.1111/j.1365-2427.2006.01667.x

Cited by 35 publications

(23 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kunz and Diehl (2003) investigated the mixed layers of 30 dimictic lakes north of the Alps during summer stratification, and the results showed algal biomass in the mixed layer was negatively related to mixing depth, which agrees well with model expectations (Kunz and Diehl 2003). Pannard et al (2007) observed an increase in mixing depth when daily mean wind speed exceeded 4 m s -1 on a time scale of a few days; thus, phytoplankton dynamics in terms of size structure and exported biomass were modified. An (2000) reported that during an intense monsoon, the mixing depth in the Taechung reservoir could exceed 30 m; thus, the magnitude and frequency of bluegreen blooms would be reduced significantly.…”

Section: Introductionsupporting

confidence: 81%

See 1 more Smart Citation

Seasonal variation of mixing depth and its influence on phytoplankton dynamics in the Zeya reservoir, China

Chen

Wang²,

et al. 2009

Limnology

View full text Add to dashboard Cite

In reservoirs or lakes, mixing depth affects growth and loss rates of phytoplankton populations. Based on 1-year data from the Zeya reservoir, China, we scaled the mixing depth throughout a whole year by utilizing cluster analysis, and then investigated its influence on phytoplankton dynamics and other physical and chemical parameters. Over the whole year, all physical and chemical parameters except TN and temperature had significant correlations with mixing depth, indicating that mixing depth is one of the important driving factors influencing water environment. According to mixing depth, a year can be divided into three different periods, including the thermally stratified period, isothermally mixed period, and transition period between them. When considering the former two different periods separately, mixing depth had no correlation with the phytoplankton biovolume. However, over the whole year a significant correlation was observed, which indicated that the influence of mixing depth on phytoplankton growth in the Zeya reservoir still followed Diehl's theory. Furthermore, according to the steady-state assumption, a unimodal curve (mixing depthphytoplankton biovolume) with a significant peak appearing at a mixing depth of 2 m was observed, closely agreeing with Diehl' prediction.

show abstract

Section: Introductionsupporting

confidence: 81%

“…Besides, in former studies, mixing depth was always estimated but not accurately scaled. For instance, Kunz and Diehl (2003) defined mixing depth as the depth at which the temperature difference to the surface did not exceed 1°C, while Pannard et al (2007) approximated the mixing depth as the depth of maximum thermal gradient.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation of mixing depth and its influence on phytoplankton dynamics in the Zeya reservoir, China

Chen

Wang²,

et al. 2009

Limnology

View full text Add to dashboard Cite

show abstract

“…Summarizing the results from previous surveys (Fig. 7) (e.g., Gikuma-Njuru et al 2013;Jaeger et al 2008;Pannard et al 2007;Rothenberger et al 2009), it clearly indicated that there are significant differences in light conditions between high-light ecosystems and low-light ecosystems when diatoms dominate in the water column. Aquatic ecosystems with annual mean light intensity (at a 0.5-m depth) below 300 μmol photons m .…”

Section: Discussionsupporting

confidence: 61%

Habitat-specific differences in adaptation to light in freshwater diatoms

et al. 2015

View full text Add to dashboard Cite

The growth and physiological characteristics of eight strains of diatoms isolated from aquatic habitats with differing water column characteristics were studied under varying light intensities to compare adaptations to low and high light intensity. Diatoms isolated from different habitats were grouped into low light-adapted (LLA) and high lightadapted (HLA) diatoms based on their differences in growth and photoacclimation characteristics. LLA diatoms had higher growth rates and higher photosynthetic activity at relatively lower light intensities (2, 12.5, and 25 μmol photons m −2 s

show abstract

“…The strength of mixing affects the sedimentation rate of both buoyant and non‐buoyant phytoplankton (Huisman et al. , 2004) and an increase in mixing favours large cells that tend to sink and diminishes species with buoyant small cells (Pannard et al. , 2007).…”

Section: Introductionmentioning

confidence: 99%

Modelling the effects on phytoplankton communities of changing mixed depth and background extinction coefficient on three contrasting lakes in the English Lake District

Bernhardt

Elliott²,

Jones³

2008

Freshwater Biology

View full text Add to dashboard Cite

1. The process-based phytoplankton community model, PROTECH, was used to model the response of algal biomass to a range of mixed layer depths and extinction coefficients for three contrasting lakes: Blelham Tarn (eutrophic), Bassenthwaite Lake (mesotrophic) and Ullswater (oligotrophic). 2. As expected, in most cases biomass and diversity decreased with decreasing light availability caused by increasing the mixed depth and background extinction coefficient. The communities were generally dominated by phytoplankton tolerant of low light. Further, more novel, factors were identified, however. 3. In Blelham Tarn in the second half of the year, biomass and diversity did not generally decline with deeper mixing and the community was dominated by nitrogen-fixing phytoplankton because that nutrient was limiting to growth. 4. In Bassenthwaite Lake, changing mixed depth influenced the retention time so that, as the mixed depth declined, the flushing rate in the mixed layer increased to the point that only fast-growing phytoplankton could dominate. 5. In the oligotrophic Ullswater, changing the mixed depth had a greater effect through nutrient supply rather than light availability. This effect was observed when the mixed layer was relatively shallow (<5.5 m) and the driver for this was that the inflowing nutrients were added to a smaller volume of water, thus increasing nutrient concentrations and algal growth. 6. Therefore, whilst changes in mixed depth generally affect the phytoplankton via commonly recognized factors (light availability, sedimentation rate), it also affected phytoplankton growth and community composition through other important factors such as retention time and nutrient supply.

show abstract

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Cited by 35 publications

References 74 publications

Seasonal variation of mixing depth and its influence on phytoplankton dynamics in the Zeya reservoir, China

Seasonal variation of mixing depth and its influence on phytoplankton dynamics in the Zeya reservoir, China

Habitat-specific differences in adaptation to light in freshwater diatoms

Modelling the effects on phytoplankton communities of changing mixed depth and background extinction coefficient on three contrasting lakes in the English Lake District

Contact Info

Product

Resources

About