Spatio-temporal variability of dinoflagellate assemblages in different salinity regimes in the west coast of India

Alkawri, Abdulsalam; Ramaiah, N.

doi:10.1016/j.hal.2009.08.012

Cited by 39 publications

(22 citation statements)

References 27 publications

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“…In the spring period they reached highest abundances. Ceratium furca preferred lower salinity waters which are usually of higher nutrient concentrations, similar to findings of Alkawri and Ramaiah (2010). The spring diatom Leptocylindrus minimus in our study significantly correlated only with low silica concentrations.…”

Section: Seasonal Succession Of the Phytoplankton Speciessupporting

confidence: 90%

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Seasonal phytoplankton dynamics in the coastal waters of the north-eastern Adriatic Sea

Godrijan

Marić

Tomažić

et al. 2013

Journal of Sea Research

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This study describes the dynamics of phytoplankton in relation to environmental factors in coastal waters of the north-eastern Adriatic Sea. The distant Po River"s influence is rarely noted on the eastern coastal part of the northern Adriatic, but it does trigger the crucial alternations in the community, e.g. mass development of diatoms in July 2009. A highly variable ecosystem, like the northern Adriatic, sustains high species diversity. Even though quite a few species were present for more than several months, we identified the seminal species of the seasonal succession. During spring Prorocentrum micans, Leptocylindrus minimus, Chaetoceros throndsenii, Ceratium furca and C. fusus were most characteristic. These species thrive in low salinity and mixed waters. Typical summer diatom species were Chaetoceros vixvisibilis, Proboscia alata, whileRhabdosphaera clavigera and Syracosphaera pulchra were identified as distinctive summer coccolithophorids. All the summer species preferred warmer waters with low nitrate and low silica content. The autumn community was characterised by species such as Calciosolenia murrayi, Chaetoceros socialis, Asterionellopsis glacialis, Lioloma pacificum. These species related to high nutrient conditions, but also to low Po River influence. In winter a prevalence of large diatoms Thalassiosira rotula, Neocalyptrella robusta and Pseudosolenia calcar-avis was recorded. The winter assemblage was characterised by species of cold water preference able to grow in well mixed conditions.

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Section: Seasonal Succession Of the Phytoplankton Speciessupporting

confidence: 90%

“…Prorocentrum micans, one of the species characterising spring assemblages, is usually found over wide ranges of water temperatures, salinities and nutrient concentrations (Alkawri and Ramaiah, 2010). In our study it responded well to the temperature increase in spring.…”

Section: Seasonal Succession Of the Phytoplankton Speciessupporting

confidence: 64%

Seasonal phytoplankton dynamics in the coastal waters of the north-eastern Adriatic Sea

Godrijan

Marić

Tomažić

et al. 2013

Journal of Sea Research

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“…It was found that high temperature and salinity are favorable to the growth of dinoflagellates (TAYLOR, 1973). The cells of Prorocentrum micans were commonly observed at all the stations over wide ranges of water temperatures, salinities and nutrient concentrations, as suggested by ALKAWRI and RAMAIAH (2010).…”

Section: Discussionmentioning

confidence: 84%

Seasonal Assessment of Hydrographic Variables and Phytoplankton Community in the Arabian Sea Waters of Kerala, Southwest Coast of India

Vishwanath

Rajashekhar

2014

Braz. j. oceanogr.

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A B S T R A C TThe seasonal variation of the hydrographic variables and phytoplankton species in the Arabian Sea waters of the Kerala coast, Southern India was investigated during different seasons. The variables such as pH, temperature, salinity, turbidity and chlorophyll-a contents of water were found to be high during pre-monsoon season and the dissolved oxygen content was minimal. The concentration of nutrients viz., nitrate, phosphate, silicate varied independently. In the study a total of 53 species of phytoplankton were recorded. Their density was higher during the post-monsoon season than during other seasons and the diatoms were found to be the dominant species. The major phytoplankton in terms of frequency and abundance were the species namely, Biddulphia mobiliensis, Chaetoceros curvisetus, Licmophora abbreviata, Skeletonema costatum, Prorocentrum micans and Oscillatoria sp. They showed significant positive correlation with pH, temperature, salinity, nitrate, phosphate and chlorophyll-a contents, whereas turbidity, dissolved oxygen and silicate exhibited significant negative correlation. The Principal Component Analysis (PCA) developed two principal components with 84.74% of total variability in the water quality which separated pre-and post-monsoon periods from the monsoon season on axis I, and pre-monsoon and monsoon periods from post-monsoon on axis II. R E S U M OFoi investigada a variação sazonal das variáveis hidrográficas e das espécies de fitoplâncton nas águas do Mar Arábico da costa de Kerala, sul da India, em diferentes estações do ano. Variáveis como pH, temperatura, salinidade, turbidez e conteúdo de clorofila-a das águas mostraram-se altas durante a estação pré-monção enquanto o conteúdo de oxigênio dissolvido foi mínimo. A concentração de nutrientes, tais como nitrato, fosfato e silicato, variaram independentemente da época. Foi encontrado um total de 53 espécies, com picos de densidade durante a estação pós-monção, sendo a dominância exercida pelas diatomáceas. Em termos de frequência e abundância, as espécies mais importantes foram Biddulphia mobiliensis, Chaetoceros curvisetus, Licmophora abbreviata, Skeletonema costatum, Prorocentrum micans and Oscillatoria sp. Estas apresentaram correlação significativa positiva com pH, temperatura, salinidade, nitrato, fosfato e conteúdo de clorofila-a, enquanto que com turbidez, oxigênio dissolvido e silicato exibiram correlação negativa. A Análise de Componentes Principais (ACP) mostrou que os dois primeiros eixos contêm 84,74% da variação na qualidade das águas. O eixo I separou os períodos de pré-e pós-monção do período de monção, enquanto o eixo II separou os períodos de pré-monção e monção do período de pós-monção.

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“…Regardless, a rise in temperature may cause or aggravate such a phytoplankton shift, especially in tropical oceans, where small temperature elevations may exceed the physiological tolerances of organisms (such as dinoflagellate symbionts) (Walther et al 2002). It is also noteworthy that the dinoflagellate species that seemed to increase in the outfall water were those known to form HABs in various places around the world (Alkawri & Ramaiah 2010). It has been reported that dinoflagellate blooms in DYB have increased during recent years (Liu et al 2003).…”

Section: Discussionmentioning

confidence: 97%

Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

Tao¹,

Liu

Huang³

et al. 2011

Mar. Ecol. Prog. Ser.

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Understanding how nuclear power plant thermal effluents influence the phytoplankton community may provide insights into the potential ecological consequences of global warming. In the present study, long-term trends in the phytoplankton community structure under the influence of nuclear power plant thermal effluent in the subtropical Daya Bay (DYB) in China were investigated in the summer season from 1982 to 2005. Water temperature at the outfall station was significantly higher than in the surrounding water, by as much as 5.6°C, and increased by 6.8°C during the 23 yr study period. The contribution of diatoms and dinoflagellates to the total phytoplankton showed significant correlation with temperature (R 2 > 0.65), negative for diatoms, while positive for dinoflagellates. Although dinoflagellate abundance increased over time at both the outfall and adjacent (control) stations, the increase at the outfall station was much more dramatic and accelerated over time. No clear relationship between the phytoplankton shift and stratification was evident. When water temperature reached 35°C or > 3.7°C above that at the control station, dinoflagellates, such as Ceratium furca, C. fusus, C. trichoceros, Dinophysis caudate and Protoperidinium depressum, grew to prominence, accounting for about 50% of the total phytoplankton abundance. On the contrary, the diatom contribution decreased during the study period, from 82.0% in 1982 to 53.1% in 2005. These results suggest that the rise in temperature caused by power plant thermal discharge has imposed strong influences on the phytoplankton community, favoring dinoflagellates over diatoms, with a remarkable diatom to dinoflagellate shift when temperature increases to a threshold level of 35°C or reaches a threshold differential of 3.7°C relative to the normal ambient temperature in DYB.KEY WORDS: Daya Bay · Nuclear power plant · Thermal effluent · Phytoplankton · Ecological effects Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 424: [75][76][77][78][79][80][81][82][83][84][85] 2011 perature can be indirect, via a decrease in the resupply of nutrients for phytoplankton production resulting from the intensification of water stratification (Margalef 1978, Jones & Gowen 1990. Since phytoplankton have short generation times, they can rapidly respond to temperature increases, and, because they are at the base of the aquatic food web, observations of their responses could provide useful insights into how temperature increases may induce ecosystem changes (Niemi & McDonald 2004). Phytoplankton community structure and abundance have been found to be changing as a result of global warming in many areas (Richardson & Schoeman 2004). For example, the changes in phytoplankton communities have been used as indicators of global warming in the North Sea (Edwards & Richardson 2004) and to monitor nonnative, warm-water species in the Mediterranean and the North Seas (Walther et al. 2002). Because organisms at different trophic levels m...

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Spatio-temporal variability of dinoflagellate assemblages in different salinity regimes in the west coast of India

Cited by 39 publications

References 27 publications

Seasonal phytoplankton dynamics in the coastal waters of the north-eastern Adriatic Sea

Seasonal phytoplankton dynamics in the coastal waters of the north-eastern Adriatic Sea

Seasonal Assessment of Hydrographic Variables and Phytoplankton Community in the Arabian Sea Waters of Kerala, Southwest Coast of India

Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

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