Growth of dinoflagellates, Ceratium furca and Ceratium fusus in Sagami Bay, Japan: The role of nutrients

Baek, Seung Ho; Shimode, Shinji; Han, Moonsik; Kikuchi, Toru

doi:10.1016/j.hal.2008.02.007

Cited by 109 publications

(40 citation statements)

References 47 publications

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“…These results indicate higher protection capacity (expressed as growth rate) than that of N. gaditana. On the other hand, growth rates increased gradually along with increasing nitrate under PAR until reach a growth rate plateau on the dinoflagellates Ceratium furca and Ceratium fusus (Baek et al 2008). However, in Heterocapsa sp.…”

Section: Discussionmentioning

confidence: 94%

Photoprotection mechanisms against ultraviolet radiation in Heterocapsa sp. (Dinophyceae) are influenced by nitrogen availability: Mycosporine‐like amino acids vs. xanthophyll cycle

Korbee¹,

Mata²,

Figueroa³

2010

Limnology & Oceanography

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The photoprotective and acclimation capacity against ultraviolet radiation (UVR) was assessed for the dinoflagellate Heterocapsa sp. We examined the effect of UVR and N availability on photosynthetic activity and on the accumulation of photoprotective substances such as mycosporine-like amino acids (MAAs) and xanthophyll cycle pigments. Cells were cultivated under two different light treatments, photosynthetically active radiation (PAR) and PAR + UVR, and at two NaNO 3 concentrations, mid nitrogen (MN, 0.1 mmol L 21 ) and high nitrogen (HN, 1 mmol L 21 ) for 6 d. MAA and photosynthetic pigment contents as well as maximum quantum yield of fluorescence (F v : F m ) and electron transport rate were analyzed at the initial time and after 3 and 6 d of experimentation. F v : F m decreased because of UVR and N limitation. N enrichment reduced the deleterious effect of UVR on photosynthesis. The content of photosynthetic pigments and MAAs was higher at HN than at MN supply and a positive effect of UVR on MAA and pigment accumulation was observed, suggesting that under HN conditions the deleterious UVR effect is counteracted by MAAs. Under N limitation thermal energy dissipation takes place by the xanthophyll cycle, i.e., an increase of the de-epoxidation degree was observed under these culture conditions. However, UVR seems to favor diadinoxanthin accumulation; thus, no photoprotection through the xanthophyll cycle seems available in cells exposed to PAR + UVR and MN. We conclude that not only MAA accumulation but also N availability is very important to determine the photoprotective capacity against UVR of Heterocapsa sp.

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Section: Discussionmentioning

confidence: 94%

Photoprotection mechanisms against ultraviolet radiation in Heterocapsa sp. (Dinophyceae) are influenced by nitrogen availability: Mycosporine‐like amino acids vs. xanthophyll cycle

Korbee¹,

Mata²,

Figueroa³

2010

Limnology & Oceanography

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“…Margalef, 1997). In shallow estuaries, short-term and transient gradients of river outflows (Acha et al, 2008), tide regimes, vertical mixing and turbidity (Baek et al 2008), and nutrient inputs (Heil et al 2005;Glibert et al, 2006), especially in areas with intense human occupation, hamper the attempts for structure determination of phytoplankton communities, either taxonomic or as functional groups. Human induced eutrophisation can trigger harmful algal blooms, so the development of conceptual models for phytoplankton dominance is imperative (Cloern, 1996).…”

Section: Introductionmentioning

confidence: 99%

Changes in phytoplankton composition in response to tides, wind-induced mixing conditions, and freshwater outflows in an urbanised estuarine complex

et al. 2012

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Recent reports have shown an increase in potentially harmful phytoplankton in Santos bay (Southeastern Brazilian Coast), located in a highly urbanised estuarine complex. Prediction of blooms is, thus, essential but the phytoplankton community structure in very dynamic regions is difficult to determine. In the present work, we discriminate bloom forming microphytoplankton dominance and their relationship to physical and meteorological variables to look for patterns observed in different tides and seasons. Comparing 8 distinct situations, we found five scenarios of dominance that could be related to winds, tides and rainfall: i) Surfers, diatoms occurring during high surf zone energies; ii) Sinkers, represented by larger celled diatoms during spring tide, after periods of high precipitation rates; iii) Opportunistic mixers, composed of chain forming diatoms with small or elongate cells occurring during neap tides; iv) Local mixers, microplanktonic diatoms and dinoflagellates which occurred throughout the 298 sampling stations; and v) Mixotrophic dinoflagellates, after intense estuarine discharges. Results suggest alterations in the temporal patterns for some bloom-forming species, while others appeared in abundances above safe limits for public health. This approach can also illustrate possible impacts of changes in freshwater discharge in highly urbanised estuaries.Keywords: phytoplankton composition, winds, tides, Santos bay, rainfall.Variações na composição da comunidade fitoplanctônica em resposta às marés, à mistura induzida pelo vento e à descarga de água doce em um sistema estuarino urbanizado ResumoEstudos recentes na baía de Santos (sudeste do Brasil), localizada em um sistema estuarino altamente urbanizado, mostraram o aumento de espécies fitoplanctônicas potencialmente nocivas. Apesar da importância da previsão das florações algais nocivas, é difícil determinar a estrutura da comunidade fitoplanctônica em ambientes extremamente dinâmicos. O presente estudo analisa florações dominadas pelo microfitoplâncton e sua relação com variáveis físicas e meteorológicas, a fim de determinar padrões associados às marés e às estações do ano. Foram comparadas oito situações e obtidos cinco cenários de dominância relacionados aos ventos, marés e pluviosidade: i) Surfers, diatomáceas associadas à zona de surfe, de alta energia; ii) Sinkers, diatomáceas de tamanho grande que ocorrem nas marés de sizígia, depois de períodos de alta pluviosidade; iii) Opportunistic mixers, diatomáceas pequenas ou alongadas, formadoras de cadeia, que ocorrem durante períodos de quadratura; iv) Local mixers, diatomáceas e dinoflagelados microplanctônicos que foram abundantes em todas as 298 estações amostradas, e v) Mixotrophic dinoflagellates, que ocorrem após intensas descargas estuarinas. Os resultados sugerem uma alteração no padrão temporal de algumas espécies formadoras de florações, enquanto outras apresentaram abundâncias superiores aos valores seguros para a saúde publica. Esta abordagem ilustra também os possíveis impactos ...

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“…autotrofia, distintas formas de mixotrofia), função direta de seu ambiente físico e químico (Margalef, 1997). Em estuários, os gradientes de salinidade, assim como as rápidas modificações nas marés, mistura vertical, nutrientes e turbidez condicionam as variações na comunidade fitoplanctônica (Baek et al, 2008). A identificação das condições ambientais capazes de conduzir à dominância de um determinado grupo fitoplanctônico, potencialmente nocivo ou não, é importante para programas de monitoramento, especialmente em áreas costeiras impactadas antropicamente (Mafra-Junior et al, 2006).…”

Section: Introductionunclassified

Variação temporal do microfitoplâncton no Canal Estuarino de Santos (SP)

Masuda¹,

Moser

Barrera-Alba

2011

Braz. J. Aquat. Sci. Technol.

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An increase in abundance of potentially toxic dinoflagellates in the Santos channel, located in a highly urbanized and eutrophic estuarine complex, was reported in the literature. Prediction of such occurences is essential, but phytoplankton community structure in dynamic estuarine systems are difficult to analyze. In the present work, we attempted to discuss microphytoplanktonic community in relation to physical variables looking for shifts in composition, in time scales of 25 hours. To achieve our goal two surveys were performed on anchored stations during 25 hours (two complete tidal cicles) in the Santos channel, during November 2005 and March/April 2006. Diatom community enhanced in periods of lower current velocity (tide peaks) during dry season, probably due to lower stratification after tidal runs and light availability, while dinoflagellates enhanced after rainfall events, probably due to a higher haline stratification and an increase in dissolved nutrients. The occurrence in high density of Pseudo-nitzschia "seriata" and Prorocentrum minimum reinforces the necessity of a constant monitoring program in the region.

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Growth of dinoflagellates, Ceratium furca and Ceratium fusus in Sagami Bay, Japan: The role of nutrients

Cited by 109 publications

References 47 publications

Photoprotection mechanisms against ultraviolet radiation in Heterocapsa sp. (Dinophyceae) are influenced by nitrogen availability: Mycosporine‐like amino acids vs. xanthophyll cycle

Photoprotection mechanisms against ultraviolet radiation in Heterocapsa sp. (Dinophyceae) are influenced by nitrogen availability: Mycosporine‐like amino acids vs. xanthophyll cycle

Changes in phytoplankton composition in response to tides, wind-induced mixing conditions, and freshwater outflows in an urbanised estuarine complex

Variação temporal do microfitoplâncton no Canal Estuarino de Santos (SP)

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