Effects of small-scale turbulence on Phaeocystis globosa (Prymnesiophyceae) growth and life cycle

Schapira, Mathilde; Seuront, Laurent; Gentilhomme, Valérie

doi:10.1016/j.jembe.2006.02.018

Cited by 21 publications

(12 citation statements)

References 44 publications

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“…Under both P-limited or P-replete conditions, small-scale turbulence had a negative impact on the growth rates of the lentic diatoms C. meneghiniana, M. varians, and S. minutulus and the Hanjiang River spring bloom-forming diatom S. hantzschii but favored the growth of the lotic diatoms C. atomus, F. crotonensis, and N. palea, indicating that hydrodynamics also plays an important role in the occurrence of diatom blooms. Some previous laboratory studies reported that growth of some algae was not affected by turbulence when P i was sufficient [1,51,63], which is similar to our results for N. palea. Our results indicate that N. palea can be affected by turbulence and P concentration, suggesting that N. palea can grow quickly under either disturbed or nutrient rich conditions.…”

Section: Growth and Nutrient Strategies Of Diatoms Under Turbulent Cosupporting

confidence: 92%

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

2011

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Diatom blooms occur in many water bodies worldwide, causing significant ecological and social concerns. In order to understand the mechanisms of diatom blooms formation, the effects of varying phosphorus (P) concentration and hydrodynamics on the growth of diatoms were studied by combining results from field observations and laboratory experiments. The field investigation showed that spring diatom blooms (Cyclotella meneghiniana and Stephanodiscus hantzschii) occurred in Lake Taihu and Hanjiang River with similar environmental factors such as water temperature, pH, and dissolved oxygen in 2008. Concentrations of total phosphorus (TP), total nitrogen, and ammonia nitrogen (NH 4 -N) in Lake Taihu were significantly higher than the concentrations in the Hanjiang River. Laboratory experiments were conducted to evaluate growth and physiological responses of four lotic diatoms (Cyclotella atomus, Fragilaria crotonensis, Nitzschia palea, and S. hantzschii, isolated from the Hanjiang River) and three lentic diatoms (C. meneghiniana, Melosira varians, and Stephanodiscus minutulus, isolated from Lake Taihu, Lake Donghu, and Guanqiao Pond, respectively) to various P concentrations under smallscale turbulent and standing conditions. Our results showed that, with turbulence, lotic diatoms C. atomus, F. crotonensis, N. palea, and S. hantzschii demonstrated a significant increase in affinity for P compared with lentic diatoms C. meneghiniana, M. varians, and S. minutulus. Moreover, lotic diatoms C. atomus, F. crotonensis, and N. palea had higher growth rates and photosynthetic efficiencies with small-scale turbulence than with standing conditions both in P-limited and P-replete conditions. Lotic species S. hantzschii and three lentic diatoms (C. meneghiniana, M. varians, and S. minutulus) grew well under standing conditions. Our results may explain our field observation that the occurrence of diatom blooms in lakes is often associated with higher TP concentrations whereas in rivers, diatom blooms occur at a wide range of TP concentrations under flows. Therefore, different hydrodynamics and nutrient concentrations determined the dominant diatom species, according to their habitat-dependent physiological characteristics.

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Section: Growth and Nutrient Strategies Of Diatoms Under Turbulent Cosupporting

confidence: 92%

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

2011

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“…Furthermore, since their culture vessels are flushed numerous times per hour to maintain stable pH in the presence of photosynthesis and calcification, this flow-through setup is not suitable for slow growing phytoplankton cultures. Therefore, we chose to bubble our cultures with CO 2 -enriched air as recommended by Gatusso and Lavigne [14], despite some reports of adverse effects of small-scale turbulence on the growth rates of delicate taxa [40][41][42]. To avoid damage by bubbling of fragile species, the CO 2 -enriched air can be continuously pumped into the headspace and will equilibrate from there into the underlying culture medium, especially when some form of agitation is provided.…”

Section: Discussionmentioning

confidence: 99%

Development of a Continuous Phytoplankton Culture System for Ocean Acidification Experiments

Wynn‐Edwards

King

Kawaguchi

et al. 2014

Water

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Abstract:Around one third of all anthropogenic CO 2 emissions have been absorbed by the oceans, causing changes in seawater pH and carbonate chemistry. These changes have the potential to affect phytoplankton, which are critically important for marine food webs and the global carbon cycle. However, our current knowledge of how phytoplankton will respond to these changes is limited to a few laboratory and mesocosm experiments. Long-term experiments are needed to determine the vulnerability of phytoplankton to enhanced pCO 2 . Maintaining phytoplankton cultures in exponential growth for extended periods of time is logistically difficult and labour intensive. Here we describe a continuous culture system that greatly reduces the time required to maintain phytoplankton cultures, and minimises variation in experimental pCO 2 treatments over time. This system is simple, relatively cheap, flexible, and allows long-term experiments to be performed to further our understanding of chronic responses and adaptation by phytoplankton species to future ocean acidification.

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“…Oscillating grid and orbital shaker tables are the most widely used systems, although nonhomogeneous turbulence has been reported with the latter (Guadayol et al ). A horizontally oscillating grid system was adopted to generate homogeneous, stationary, and isotropic turbulence similarly to the device used by Schapira et al (). As filamentous species were used in our experiments, such a device avoids any accidental resuspension of filaments stranded in the mesh, unlike vertical grid systems.…”

Section: Methodsmentioning

confidence: 99%

Turbulence effects on phytoplankton morphofunctional traits selection

Fraisse

Bormans

Lagadeuc

2015

Limnology & Oceanography

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Turbulence can regulate phytoplankton community structure in aquatic ecosystems by affecting sedimentation and nutrient acquisition. In rivers, nutrient concentrations are often high enough to sustain phytoplankton growth without limitation. Hence, turbulence mainly acts on phytoplankton by controlling its vertical position in such ecosystems. We conducted a laboratory experiment to see if the response of phytoplankton to turbulence could be predicted from morphofunctional traits related to sinking velocity and maximum growth rate. Turbulence was generated by horizontally oscillating grid systems in three 5 L chambers, which also constituted three chemostats. Two turbulence levels typical of lowland rivers (E 5 7.9 3 10 25 m 2 s 23 and E 5 7.8 3 10 23 m 2 s 23 ) were tested on an experimental community composed of six species from different taxonomic lineages. The species selected displayed different values for five morphofunctional traits related to sinking velocity and maximum growth rate (S : V ratio, algal unit size, density, shape, and motility). We showed that community structure could be partly predicted from morphofunctional traits. Under low turbulence (LT) (E 5 7.9 3 10 25 m 2 s 23 ), species displaying traits leading to high sinking velocity (i.e., large size and high density) were unable to sustain stable populations, whereas species which displayed the opposite traits (i.e., small size, flattened shape, or low density) dominated the community. Furthermore, one of the six species exhibited phenotypic plasticity in size and could adapt to both high and LT conditions.

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Effects of small-scale turbulence on Phaeocystis globosa (Prymnesiophyceae) growth and life cycle

Cited by 21 publications

References 44 publications

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

Can Hydrodynamics Change Phosphorus Strategies of Diatoms?—Nutrient Levels and Diatom Blooms in Lotic and Lentic Ecosystems

Development of a Continuous Phytoplankton Culture System for Ocean Acidification Experiments

Turbulence effects on phytoplankton morphofunctional traits selection

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