Dynamics of Teleaulax-like cryptophytes during the decline of a red water bloom in the Columbia River Estuary

Hamilton, Maria; Hennon, Gwenn M. M.; Morales, Rhonda; Needoba, Joseph A.; Peterson, Tawnya D.; Schatz, Megan J.; Swalwell, Jarred; Armbrust, E. Virginia; Ribalet, François

doi:10.1093/plankt/fbx029

Cited by 11 publications

(10 citation statements)

References 30 publications

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“…, Hamilton et al. ). However, in the environment, different factors may also contribute to bloom development of Mesodinium spp.…”

Section: Discussionmentioning

confidence: 99%

“…These experimental studies corroborate the occurrence of Mesodinium spp. in situ being quantitatively related to the presence of Teleaulax amphioxeia (Herfort et al 2011, Peterson et al 2013, Hamilton et al 2017. However, in the environment, different factors may also contribute to bloom development of Mesodinium spp.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, in the Columbia River estuary, development and structure of M. rubrum blooms may also be explained by changes in abiotic factors (e.g., increases in light intensity and dissolved organic compounds, a decrease in turbulence), biotic factors (e.g., prey preference and availability), or a combination of those factors (Herfort et al 2011, Peterson et al 2013. Nonetheless, the impact of nutrient limitations and ratios on growth and photosynthetic activity of T. amphioxeia should be further investigated, as they also appeared to drive M. rubrum bloom initiation (Peterson et al 2013, Hamilton et al 2017 and directly impact growth of M. rubrum (Hattenrath-Lehmann and Gobler 2015).…”

Section: Discussionmentioning

confidence: 99%

“…A relationship between T. amphioxeia and M. rubrum and between M. rubrum and the occurrence of Dinophysis spp. has been suggested in natural environments (Herfort et al 2011, Peterson et al 2013, Hamilton et al 2017. The influence of M. rubrum concentration on growth (Park et al 2006, Kim et al 2008, Nagai et al 2011, Tong et al 2011, Hattenrath-Lehmann and Gobler 2015, Smith et al 2018) and toxin production (Gao et al 2017) of Dinophysis spp.…”

mentioning

confidence: 99%

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Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹

Gaillard

Charrier

Malo

et al. 2020

Journal of Phycology

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The cryptophyte Teleaulax amphioxeia is a source of plastids for the ciliate Mesodinium rubrum and both organisms are members of the trophic chain of several species of Dinophysis. It is important to better understand the ecology of organisms at the first trophic levels before assessing the impact of principal factors of global change on Dinophysis spp. Therefore, combined effects of temperature, irradiance, and pH on growth rate, photosynthetic activity, and pigment content of a temperate strain of T. amphioxeia were studied using a full factorial design (central composite design 23*) in 17 individually controlled bioreactors. The derived model predicted an optimal growth rate of T. amphioxeia at a light intensity of 400 μmol photons · m−2 · s−1, more acidic pH (7.6) than the current average and a temperature of 17.6°C. An interaction between temperature and irradiance on growth was also found, while pH did not have any significant effect. Subsequently, to investigate potential impacts of prey quality and quantity on the physiology of the predator, M. rubrum was fed two separate prey: predator ratios with cultures of T. amphioxeia previously acclimated at two different light intensities (100 and 400 μmol photons · m−2 s−1). M. rubrum growth appeared to be significantly dependent on prey quantity while effect of prey quality was not observed. This multi‐parametric study indicated a high potential for a significant increase of T. amphioxeia in future climate conditions but to what extent this would lead to increased occurrences of Mesodinium spp. and Dinophysis spp. should be further investigated.

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“…, Hamilton et al. ). However, in the environment, different factors may also contribute to bloom development of Mesodinium spp.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹

Gaillard

Charrier

Malo

et al. 2020

Journal of Phycology

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“…The samples were analyzed on a San ++ Continuous Flow Analyser (Skalar Analytical B.V, Breda, NL) as previously described (Grasshof, 1976;Kaas and Markager, 1998 …”

Section: Nutrientsmentioning

confidence: 99%

Phytoplankton Community Dynamic: A Driver for Ciliate Trophic Strategies

et al. 2018

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Phytoplankton plays a key role as primary producers and mediating biogeochemical cycles in the water column. The understanding of the temporal dynamic of primary grazers channeling energy and carbon from primary producers is important for evaluating aquatic ecosystems functioning. This study investigates the coupling between phytoplankton and ciliates from live samples collected with approximately daily frequency during an almost 2-year cycle. The study site is a nutrient-rich temperate estuary, Roskilde Fjord (Denmark). Our aim is to evaluate the importance of protist grazers, especially ciliates, as predators on phytoplankton and to evaluate differences among multiple nutritional strategies through different seasons. The phytoplankton community, was mostly dominated by small organisms (<20 µm) with few observations of diatoms. In most of observations, heterotrophic dinoflagellates biomass was smaller than biomass of ciliates (<10%), indicating that ciliates are the main component of microzooplankton. Except for the spring 2016, the ciliate community closely followed the phytoplankton community, showing a tight coupling between the primary producers and grazers during all seasons. This somehow contradicts the general assumption that ciliate dominance is restricted to periods of nutrient limitation dominated by the microbial food web and suggests a year-round key role of ciliates as consumers of phytoplankton biomass. Biomasses of ciliates increased during spring and were highest during summer. Relative importance of mixotrophs were high due to occurrence of Mesodinium rubrum blooms as well as other mixotrophic ciliates in late spring/early summer. M. rubrum biomass had the opposite pattern of the cryptophyte prey Teleaulax spp., and the coupling between the two populations was very strong in late spring. Ciliates that grazed on selected phytoplankton, had a smaller potential grazing impact regarding their biomasses, likely due to food limitation; conversely ciliates that feed on diverse prey items were less constrained by food limitation, and their seasonality appear to be driven by other factors. These findings suggest that the ciliate community structure and dynamics is important in structuring the phytoplankton community on short and seasonal scale.

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Automatic recognition of flow cytometric phytoplankton functional groups using convolutional neural networks

Fuchs

Thyssen

Créach

et al. 2022

Limnology & Ocean Methods

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The variability of phytoplankton distribution has been unraveled by high-frequency measurements. Such a resolution can be approached by automated pulse-shape recording flow cytometry (AFCM) operating at hourly sampling resolution. AFCM records morphological and physiological traits as single-cell optical pulse shapes that can be used to classify cells into phytoplankton functional groups (PFGs). However, the associated manual post-processing of the data coupled with the increasing size and number of datasets is time-consuming and error-prone. Machine learning models are increasingly used to run automatic classification. Yet, most of the

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Dynamics of Teleaulax-like cryptophytes during the decline of a red water bloom in the Columbia River Estuary

Cited by 11 publications

References 30 publications

Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹

Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹

Phytoplankton Community Dynamic: A Driver for Ciliate Trophic Strategies

Automatic recognition of flow cytometric phytoplankton functional groups using convolutional neural networks

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Dynamics of Teleaulax-like cryptophytes during the decline of a red water bloom in the Columbia River Estuary

Cited by 11 publications

References 30 publications

Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)1

Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)1

Phytoplankton Community Dynamic: A Driver for Ciliate Trophic Strategies

Automatic recognition of flow cytometric phytoplankton functional groups using convolutional neural networks

Contact Info

Product

Resources

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Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹

Combined Effects of Temperature, Irradiance, and pH on Teleaulax amphioxeia (Cryptophyceae) Physiology and Feeding Ratio For Its Predator Mesodinium rubrum (Ciliophora)¹