Nutrient Limitation in Northern Gulf of Mexico (NGOM): Phytoplankton Communities and Photosynthesis Respond to Nutrient Pulse

Zhao, Yan; Quigg, Antonietta

doi:10.1371/journal.pone.0088732

Cited by 36 publications

(35 citation statements)

References 63 publications

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“…Given the similar thermal stratification and sediment properties of the Zhoucun Reservoir in 2013 and 2014, the amount of nutrients discharged from the sediment probably varied little between the two years. Therefore, rainfall fluctuation likely altered the concentration of NO 3 ¡ in the Zhoucun Reservoir, affecting nitrogen species and the mass ratio of N to P. This in turn may have influenced phytoplankton dynamics and community structure (Horst et al 2014, Zhao andQuigg 2014).…”

Section: Discussionmentioning

confidence: 99%

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Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

Qiu

Zeng

2016

Journal of Freshwater Ecology

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Rainfall-induced nutrient fluctuations in surface water affect phytoplankton communities and cause algal blooms. To examine this influence in the Zhoucun Reservoir, China, field surveys were performed weekly or biweekly from February 2013 (a wet year) to December 2014 (a dry year). Physical conditions, nutrient levels, and phytoplankton functional groups were investigated during monitoring. Nutrient levels increased in the summer of 2013 (TN: 0.85À2.66 mg/L; TP: 0.037À0.138 mg/L), while nitrogen deficiency occurred in the summer of 2014 (TN: 0.38À0.73 mg/L, TP: 0.044À0.079 mg/L). A cyanobacteria bloom that appeared in the summer of 2013 had the dominant phytoplankton functional groups M and Tc. In the summer of 2014, algal cell density and biomass were much lower than those during the corresponding period in 2013, and the co-dominant phytoplankton groups were F, L 0 , Tc, and S2. Non-N-fixing cyanobacteria were not abundant in summer 2013 probably because of the low ratio of NO 3 ¡ to NH 4 C , although nitrogen was also deficient. In contrast to these summer trends, little difference was noted between phytoplankton dynamics and community structure in the two winters and two springs, regardless of nutrient conditions. Redundancy analysis indicated that rainfall-induced nitrogen fluctuations were the primary factor causing phytoplankton dynamics to differ between the wet and dry year. The effects of water temperature, stratification, and light on the phytoplankton community were independent of nutrient fluctuations. This study shows that rainfall fluctuations change summer nutrient conditions and that cyanobacteria blooms are likely to occur in wet years in the Zhoucun Reservoir.

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Section: Discussionmentioning

confidence: 99%

“…The content, structure, and ratio of nutrients in aquatic systems profoundly influence phytoplankton dynamics and community structure (Zhao and Quigg 2014). Because the response of algae to nutrient fluctuations varies by species (Donald et al 2013), the effects of nutrients on phytoplankton communities are site specific .…”

Section: Introductionmentioning

confidence: 99%

Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

Qiu

Zeng

2016

Journal of Freshwater Ecology

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“…, Dorado et al. , Zhao and Quigg ). At Station ALOHA, they found a significant increase in large cells (such as diatoms) and carbon fixation rates after nutrient additions in surface waters, especially in summer, leading to an increase in carbon export (Mahaffey et al.…”

mentioning

confidence: 99%

“…, Moore et al. , Zhao and Quigg ). Diatoms respond quickly to N pulses in coastal environments while coccolithophores are more prevalent in oligotrophic environments where N inputs are less frequent and/or significant.…”

mentioning

confidence: 99%

The 24 hour recovery kinetics from n starvation in Phaeodactylum tricornutum and Emiliania huxleyi

Zhao

Wang

Quigg

2015

Journal of Phycology

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The response of N (nitrate) starved cells of the diatom Phaeodactylum tricornutum and the coccolithophore Emiliania huxleyi to a pulse of new N were measured to investigate rapid cellular and photosynthetic recovery kinetics. The changes of multiple parameters were followed over 24 h. In P. tricornutum, the recovery of Fv /Fm (the maximum quantum yield of PS II) and σPSII (the functional absorption cross-section for PSII) started within the first hour, much earlier than other parameters. Cellular pigments did not recover during the 24 h but the chlorophyll (chl) a/carotenoid ratios increased to levels measured in the controls. Cell division was independent of the recovery of chl a. In E. huxleyi, the recovery of Fv /Fm and σPSII started after an hour, synchronous with the increase in cellular organic N and chl a with pigments fully recovered within 14 h. P. tricornutum prioritized the recovery of its photosynthetic functions and cell divisions while E. huxleyi did not follow this pattern. We hypothesize that the different recovery strategies between the two species allow P. tricornutum to be more competitive when N pulses are introduced into N-limited water while E. huxleyi is adapted to N scarce waters where such pulses are infrequent. These findings are consistent with successional patterns observed in coastal environments. This is one of only a few studies exploring recovery kinetics of cellular functions and photosynthesis after nitrogen stress in phytoplankton. Our results can be used to enhance ecological models linking phytoplankton traits to species diversity and community structure.

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“…Dans cette étude, six genres sur les neuf mis en culture se sont développés, soit 66.66% de succès. Pour la culture des cyanobactéries, l'avantage statistiquement significatif du milieu M1 modifié sur les milieux M2 et M3 modifié pourrait s'expliquer en partie par la composition des milieux (Zhao et al, 2014). En effet, la concentration en nitrate des milieux serait un facteur limitant de certains genres de cyanobactéries, quand l'absence de chlorure de sodium limiterait la croissance d'autres souches.…”

Section: Discussionunclassified

Essai préliminaire de mise en oeuvre de culture de cyanobactérie en Côte d’Ivoire

Coulibaly¹,

Noël²,

Soumahoro³

et al. 2014

Int. J. Bio. Chem. Sci

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RESUMELes cyanobactéries sont des bactéries photosynthétiques capable produire des métabolites secondaires dont les cyanotoxines. Les blooms à cyanobactérie toxiques représentent des menaces aussi bien pour l'environnement que l'homme et les animaux. L'étude des toxines et autres métabolites nécessitent des cultures viables de cyanobactérie. Cependant, la culture in vitro de cyanobactérie en Côte d'Ivoire est peu développée. Cette étude s'est donnée pour objectif d'expérimenter la culture in vitro de cyanobactérie à partir d'échantillon de phytoplankton récolté dans la nature. Une revue de la littérature a servi de base à cette étude. Elle a permis d'identifier un site de prélèvement, des techniques et des clés d'identification des cyanobactéries. Elle a également permis la sélection de milieux de culture à utiliser. Un « incubateur artisanal » a été développé pour la culture de cyanobactéries. Le milieu Bold modifié (M1) était statistiquement le plus adapté à la culture des cyanobactéries en général. La composition de ce milieu pourrait avoir favorisé le développement de certains genres aux détriments d'autres. La culture de cyanobactéries a été mise en oeuvre. Il reste cependant à améliorer la technique à poursuivre vers la purification des cultures et l'étude des métabolites secondaires.

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Nutrient Limitation in Northern Gulf of Mexico (NGOM): Phytoplankton Communities and Photosynthesis Respond to Nutrient Pulse

Cited by 36 publications

References 63 publications

Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

Differences in phytoplankton dynamics and community structure between a wet year and dry year in the Zhoucun Reservoir

The 24 hour recovery kinetics from n starvation in Phaeodactylum tricornutum and Emiliania huxleyi

Essai préliminaire de mise en oeuvre de culture de cyanobactérie en Côte d’Ivoire

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