Influence of environmental nutrient conditions on Gymnodinium breve (Dinophyceae) population dynamics: a numerical study

Liu, Gang; Janowitz, G. S.; Kamykowski, Daniel

doi:10.3354/meps213013

Cited by 31 publications

(32 citation statements)

References 23 publications

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“…Liu et al (2001b) calculated that average uptake rates ranged from 0.122 pmol N cell ) was similar to the 0.14 pmol N cell -1 h -1 reported previously (Steidinger et al 1998). While the total cellular N found in this study was similar to batch experiments presented in Sinclair et al (2006), both were more similar to the N-deficient daughter cell used in Liu (2001a,b).…”

Section: Discussionsupporting

confidence: 88%

“…Low concentrations of nitrogen (N) and phosphorus (P) (0.1 to 0.2 µM) throughout the water column, including near bottom waters, are commonly observed offshore to within 2 to 4 km of the shore (Dragovich et al 1961, Vargo & Shanley 1985. The sources from which K. brevis may acquire nitrogen include blooms of the N-fixing cyanobacteria Trichodesmium (Walsh & Steidinger 2001), coastal surface plumes, and offshore, mid-shelf and coastal upwelling (Liu et al 2001b).…”

Section: Introductionmentioning

confidence: 99%

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Nitrate uptake by Karenia brevis. II. Behavior and uptake physiology in a nitrate-depleted mesocosm with a bottom nutrient source

Sinclair

Kamykowski²,

Milligan³

et al. 2006

Mar. Ecol. Prog. Ser.

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Karenia brevis may optimize growth by alternately maximizing exposure to light, migrating up into an oligotrophic water column during the day, and to nutrients (nitrate), by migrating down to the sediment-water interface at night. Understanding how cell behavior contributes to the acquisition of light and nutrients that are separated in space is critical to understanding how K. brevis populations persist in oligotrophic environments. In response to previous modeling efforts that parameterized cell physiology and behavior in nitrate-replete conditions, we examined similar cellular characteristics in a stratified 1.5 m deep mesocosm. The upper 2/3 of the mesocosm, encompassing the surface and middle samples, was nitrate depleted (< 0.5 µM NO 3 -) and simulated an oligotrophic water column. The lower 1/3 of the mesocosm contained 10 µM NO 3 -corresponding to elevated nutrient levels near the sediment -water interface. We sampled uptake rates at 3 depths during the day at light levels of 350, 125 and 60 µmol quanta m -2 s -1 and again at night in the dark. Nocturnal uptake of nitrate in the mesocosm was significantly less than diurnal uptake. Nocturnal uptake rates in the mesocom were intermediate between cells exposed to prolonged nitrate-depleted and nitrate-replete conditions. Both migration, as indicated by diel aggregation patterns, and cell physiology indicate that descent to regions of higher nutrient concentrations were sufficient to maintain average growth rates of 0.3 div d

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Nitrate uptake by Karenia brevis. II. Behavior and uptake physiology in a nitrate-depleted mesocosm with a bottom nutrient source

Sinclair

Kamykowski²,

Milligan³

et al. 2006

Mar. Ecol. Prog. Ser.

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“…Previous modeling efforts by Liu et al (2001a) elaborated on the metabolically-influenced vertical migration behavior of Karenia brevis introduced by Kamykowski & Yamazaki (1997). Liu et al (2001b) explored how different nutrient sources might influence the population growth of K. brevis, and how vertical position, determined by biochemical, behavioral, and environmental factors, influenced transport trajectories on the West Florida Shelf. This work expands upon Liu et al (2001b) by defining the nocturnal uptake capacity of K. brevis for nitrate and by suggesting that an additional near-bottom nutrient source on the West Florida Shelf may be the sediment-water interface.…”

Section: Discussionmentioning

confidence: 99%

Nitrate uptake by Karenia brevis. I. Influences of prior environmental exposure and biochemical state on diel uptake of nitrate

Sinclair

Kamykowski²,

Milligan³

et al. 2006

Mar. Ecol. Prog. Ser.

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) and nitrate-replete conditions (~20 μM NO 3 -) prior to the experiment. Cells exposed to nitrate-depleted environments for 12 h prior to the experiment enhanced nocturnal uptake compared to cells continuously exposed to nitrate-replete conditions. Changes in cell physiology may contribute to nitrate acquisition after descent from oligotrophic environments to areas with elevated nitrate concentrations. KEY WORDS: Karenia brevis · Dinoflagellate · Physiology · Nocturnal uptake · Vertical migrationResale or republication not permitted without written consent of the publisher

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“…comm.). For these species, cell-level swimming may constitute an important mechanism that regulates cell abundance and distribution, either directly by concentrating algal cells via interactions of swimming behaviors with ambient flows (Kessler 1985;Franks 1997) or indirectly by enabling cells to locate favorable microenvironments that enhance algal growth rates (Watanabe et al 1988;Liu et al 2001). These consequences of motility suggest that quantitative characteristics of swimming behaviors may strongly influence where and when HABs occur.…”

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confidence: 99%

Relating cell‐level swimming behaviors to vertical population distributions in Heterosigma akashiwo (Raphidophyceae), a harmful alga

Bearon

Grünbaum

Cattolico

2004

Limnology & Oceanography

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Abstract-Cell motility may facilitate the formation of harmful algal blooms (HABs) by enabling algal cells to swim to favorable microenvironments that support explosive growth. Motility also augments the formation of algal cell aggregations that are often associated with ecological and economic consequence. In this study, we used computerized video analysis to quantify cell-level swimming characteristics by reconstructing cell trajectories in the motile raphidophyte Heterosigma akashiwo, a unicellular alga that forms toxic surface slicks in temperate coastal waters worldwide. Heterosigma cells are capable of rapid changes between at least two active swimming modes, distinguishable by the magnitude of the oscillatory component of motion. Swimming direction varied during a diurnal photoperiod, with swimming direction changing from random to upward directed shortly after the start of the light phase. Motility assays performed 6-8 h into the light phase showed that two Heterosigma strains from geographically distant locations differed significantly in gross swimming speeds, with mean values of 49-66 m s Ϫ1 for strain CCMP452 (West Atlantic, USA), and 88-119 m s Ϫ1 for strain CCAP934-1 (North Sea, Norway). A spatially explicit model of vertical distribution of Heterosigma cells based on strain-specific motility data suggests that cells of the two strains may diverge in water-column position within a few hours and that CCAP934-1 develops dense surface aggregations more rapidly and more robustly than CCMP452. Propensity to form toxic surface slicks, and therefore frequency and severity of HAB impacts, may vary substantially among Heterosigma strains, mediated by differences in cell-level motility.

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Influence of environmental nutrient conditions on Gymnodinium breve (Dinophyceae) population dynamics: a numerical study

Cited by 31 publications

References 23 publications

Nitrate uptake by Karenia brevis. II. Behavior and uptake physiology in a nitrate-depleted mesocosm with a bottom nutrient source

Nitrate uptake by Karenia brevis. II. Behavior and uptake physiology in a nitrate-depleted mesocosm with a bottom nutrient source

Nitrate uptake by Karenia brevis. I. Influences of prior environmental exposure and biochemical state on diel uptake of nitrate

Relating cell‐level swimming behaviors to vertical population distributions in Heterosigma akashiwo (Raphidophyceae), a harmful alga

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