Effect of small-scale shear on grazing and growth of the dinoflagellate Pfiesteria piscicida

Stoecker, Diane K.; Long, Amy; Suttles, Steven E.; Sanford, Lawrence P.

doi:10.1016/j.hal.2005.11.009

Cited by 23 publications

(25 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Limited available results concerning the relationship between the instrumentally measured RMSturbulence and the plankton are in agreement with these observations. Below a threshold of , 0.6-0.7 cm s 21 , RMS-turbulence positive effects were reported, while negative effects were characteristic at values exceeding the threshold (Stoecker et al 2006;Hondzo and Warnaars 2008). Accordingly, Lake Balaton, by its high energy dissipation rate (up to 6.67 3 10 23 m 2 s 23 ) and RMSturbulence (up to 11.7 cm s 21 ) and small Kolmogorov length scale (0.15-1.88 mm), appears to be a kinetically very difficult environment for the zooplankton.…”

Section: Discussionmentioning

confidence: 98%

Zooplankton community response to enhanced turbulence generated by water‐level decrease in Lake Balaton, the largest shallow lake in Central Europe

Tóth

Parpală

Balogh

et al. 2011

Limnology & Oceanography

View full text Add to dashboard Cite

During the unusually long European drought between 2000 and 2003, the water level of the large and shallow Lake Balaton, Hungary (area 5 596 km 2 , mean depth 5 3.25 m), decreased by 28%. Although food availability for zooplankton remained unchanged, and the fish stock declined more than the water mass, the density of populations of several planktonic rotifers, cladocerans, calanoid copepodes, and veligers decreased by 60-90% simultaneously with the water-level decrease and regenerated only after the drought. The generally strong turbulence of the lake was intensified during the four consecutive years of low water, as verified by instrumental monitoring of the turbulence intensity and by the estimation of the turbulent kinetic-energy dissipation rate. In our tank experiments, turbulence conditions similar to those that existed in the lake during low water were simulated, but mineral suspended material was minimized and food was regularly resupplied. Under these experimental conditions, zooplankton taxa showing the highest mortality were the same as those that were most susceptible in situ. Increased turbulence coupled with the water-level decrease is especially unfavorable for rotifer Keratella, the cladoceran Daphnia, Bosmina, and copepodit and adult stages of the calanoid copepod Eudiaptomus gracilis in this lake.Moderate turbulence intensity is beneficial for zooplankton, because it increases the producer-consumer encounter rate, and improves consumers' capture efficiency, feeding, and growth rates (Saiz and Alcaraz 1991; Visser and Stips 2002;Visser et al. 2009). High turbulence, however, interferes with the feeding current of the suspension feeders, erodes the remote detection of prey by their predators, inhibits their food ingestion, and increases their metabolic energy expenditures Kiørboe and Saiz 1995;Peters and Marrasé 2000). And finally, very high turbulence could disorientate the movement, lead to uncontrolled vertical drifting, and could even injure the largest bodied organisms (Reynolds 1992;Visser et al. 2009).Earlier we proved experimentally and quantified the relationship between frequently resuspended fine mineral sediment (mineral turbidity) of Lake Balaton and inhibition of the effective food collection and development of cladocerans, especially Daphnia, even if food abundance exceeded threshold concentrations (G.-Tó th 1984; G. -Tó th et al. 1986). However, the direct physical effect of turbulence on the zooplankton was never established in Lake Balaton or any other shallow lake.Lake Balaton is the largest shallow lake in Central Europe. Because the lake is very shallow, the vertical space for the dissipation of the kinetic energy content of the water mass induced by the wind is very limited, and so dissipation per unit of volume is very high. Higher than 4 m s 21 wind velocity occurs, on average, every third day and causes a turbulence sufficient to resuspend sediments. Wind faster than 10 m s 21 occurs , 12-15 times annually, resulting in sediment resuspension up to 600 mg dry wei...

show abstract

Section: Discussionmentioning

confidence: 98%

Zooplankton community response to enhanced turbulence generated by water‐level decrease in Lake Balaton, the largest shallow lake in Central Europe

Tóth

Parpală

Balogh

et al. 2011

Limnology & Oceanography

View full text Add to dashboard Cite

show abstract

“…G mm is the maximum specific rate for zoospore grazing, MK s is the half-saturation constant for zoospore grazing, and S rate is a shear rate that modifies the grazing rate of the zoospores as a function of turbulence. Shear due to turbulence is one of the factors Stoecker et al (2006). The high shear rate of 3 was chosen as a maximum potential value that might be encountered in an estuarine environment like Pocomoke Flats where Pfiesteria outbreaks have occurred and also because Stoecker et al (2006) show experimentally that a shear rate value of 3 has a significant negative impact on Pfiesteria feeding and growth rate.…”

Section: Zoosporesmentioning

confidence: 99%

“…Shear due to turbulence is one of the factors Stoecker et al (2006). The high shear rate of 3 was chosen as a maximum potential value that might be encountered in an estuarine environment like Pocomoke Flats where Pfiesteria outbreaks have occurred and also because Stoecker et al (2006) show experimentally that a shear rate value of 3 has a significant negative impact on Pfiesteria feeding and growth rate. 3: From Anderson et al (2003).…”

Section: Zoosporesmentioning

confidence: 99%

“…These studies have helped to clarify the influences of organic and inorganic nutrient concentrations and ratios (Lewitus et al, 1999a,b;Skelton et al, 2006), food abundance and quality Lewitus et al, 2006), grazing control (Roman et al, 2006) and the role of turbulence (Stoecker et al, 2006). Taken together, these studies suggest that Pfiesteria blooms are more likely to occur under stratified conditions when organic nutrient concentrations are high, and top-down grazing losses are minimized.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Modeling the influence of nutrients, turbulence and grazing on Pfiesteria population dynamics

et al. 2006

Self Cite

View full text Add to dashboard Cite

“…The advantage of laminar Couette flow is that the flow field is fully characterized on the basis of the dimensions of the cylinders and the angular rotation of the outer cylinder (Taylor 1923;Van Duuren 1968); for steady rotation of the outer cylinder the shear level in the gap is nearly uniform so that all organisms experience a similar flow field with nearly constant levels of fluid rate of strain (i.e., shear rate). Steady Couette flow has been used to study the effect of fluid shear on the population growth of Lingulodinium polyedrum (Thomas and Gibson 1990b;Juhl et al 2000;Juhl and Latz 2002) and other dinoflagellates (Juhl et al 2001;Stoecker et al 2006). The reported shear rate threshold for growth inhibition for L. polyedrum is approximately 2 s 21 (Thomas and Gibson 1990a), equivalent to a rate of dissipation of kinetic energy per unit mass, e, of the order of 10 26 m 2 s 23 (Rohr et al 2002).…”

mentioning

confidence: 99%

Effect of fully characterized unsteady flow on population growth of the dinoflagellate Lingulodinium polyedrum

Latz

Allen

Sarkar

et al. 2009

Limnology & Oceanography

View full text Add to dashboard Cite

Dinoflagellate population growth is inhibited by fluid motion, which is typically characterized by some average flow property, regardless if the flow is steady or unsteady. This study compares the effect of fully characterized steady and unsteady flow on net population growth of the red tide dinoflagellate Lingulodinium polyedrum. The unsteady flow fields were generated using oscillatory laminar Couette flow and characterized analytically to provide complete knowledge of the fluid shear exposure over space and time throughout the chamber. Experimental conditions were selected so all cells experienced a similar shear exposure regardless of their position within the chamber. Unsteady flow with maximum shears of 6.4 s 21 and 6.7 s 21 and an average absolute shear of 4 s 21 , comparable with levels found at the ocean surface on a windy day, resulted in higher levels of growth inhibition than for steady Couette flow with shears of 4 and 8 s 21 . Over the parameter space studied, growth inhibition increased with increasing treatment duration (5-120 min) but was insensitive to oscillation period (60-600 s) or whether the unsteady flow changed in direction. These results indicate that over the parameter space studied, unsteady flow is more inhibitory to net growth than steady flow, for the same average flow conditions, and demonstrate that flow characterization on the basis only of average flow properties is inadequate for comparing population growth in unsteady and steady flows.

show abstract

Effect of small-scale shear on grazing and growth of the dinoflagellate Pfiesteria piscicida

Cited by 23 publications

References 42 publications

Zooplankton community response to enhanced turbulence generated by water‐level decrease in Lake Balaton, the largest shallow lake in Central Europe

Zooplankton community response to enhanced turbulence generated by water‐level decrease in Lake Balaton, the largest shallow lake in Central Europe

Modeling the influence of nutrients, turbulence and grazing on Pfiesteria population dynamics

Effect of fully characterized unsteady flow on population growth of the dinoflagellate Lingulodinium polyedrum

Contact Info

Product

Resources

About