Effect of ageing on survival of benthic diatom propagules

Anil, Arga Chandrashekar; Mitbavkar, Smita; D’Silva, Maria Shamina; Hegde, Sahana; D’Costa, Priya M.; Meher, Surekha S.; Banerjee, Dipanwita

doi:10.1016/j.jembe.2006.11.006

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…The reduction of O. sinensis in the Cassino Beach surf zone in recent years showed the importance of long-term studies for the understanding of interannual cycles. The genus Odontella presents benthic propagules surviving the aging process for at least 5 years (Anil et al 2007) and it is thus probable that the disappearance of these species is related to the burying of cell stocks by mud. This does not explain all changes as for example the pattern of Group VI (the benthic P. sulcata and other pennate and centric diatoms).…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton Interannual Variability at Cassino Beach, Southern Brazil (1992–2007), with Emphasis on the Surf Zone Diatom Asterionellopsis glacialis

Odebrecht

Bergesch

Rörig

et al. 2009

Estuaries and Coasts

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A long-term study (monthly sampling, 1992 to 2007) was conducted in the surf zone of Cassino Beach, Southern Brazil, in order to detect possible natural and/or anthropogenic disturbances. Surface water temperature (6-29°C) was the only parameter with predictable seasonal variation; salinity (14-38) was inversely related to rainfall (3.1-485.2 mm month −1 ) and low values followed extreme precipitation periods in and 2002/2003. Asterionellopsis glacialis and chlorophyll a presented high concentrations and peak frequency until 1998, when an intense mud deposition occurred with concomitant extreme rainfall. It affected the surf zone and beach, changing the hydrology and dissolved inorganic nutrient availability. Six phytoplankton species groups were recognized with distinct responses to this mud deposition. We conclude that large-scale climatic changes, like El Niño Southern Oscillation, in conjunction with human activities significantly altered the phytoplankton ecology of the highly dynamic Cassino Beach surf zone.

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Section: Discussionmentioning

confidence: 99%

Phytoplankton Interannual Variability at Cassino Beach, Southern Brazil (1992–2007), with Emphasis on the Surf Zone Diatom Asterionellopsis glacialis

Odebrecht

Bergesch

Rörig

et al. 2009

Estuaries and Coasts

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“…No signal of lutein was observed in the chromatogram, indicating the disappearance of the green algae once again at elevated salinity. The presence of diatoms in the mixed water samples (at salinity of 4 and 6) could only be explained by considering the fact of proliferation of the diatom propagules in optimal salinity and nutrient conditions [34][35][36] (as diatom cells could neither come from the freshwater (no signal of fucoxanthin was observed in freshwater) nor from the aged coastal water).…”

mentioning

confidence: 99%

Impact of salinity and pH on phytoplankton communities in a tropical freshwater system: An investigation with pigment analysis by HPLC

et al. 2011

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An in vitro study was carried out to understand the effects of salinity shock and variation in pH on phytoplankton communities in a tropical freshwater system of the Godavari River (a major peninsular river in India). The distributions of, and variations in, phytoplankton communities were assessed by quantitative determination of their class specific marker pigments, using HPLC. Subtle changes in salinity of the freshwater by one practical salinity unit (PSU) completely removed green algae from the system and allowed the cyanobacteria to come into dominance. The cyanobacteria were found to tolerate higher osmotic stress until the salinity reached a PSU of 16. The higher salinity tolerance range of the cyanobacteria was attributed to the enhanced synthesis of zeaxanthin as protective xanthophylls against the osmotic stress. However, the effects of changing pH were not as dramatic as salinity where the green algae and the cyanobacteria from the same freshwater system showed a considerable acclimation towards the fluctuating pH. These findings are environmentally relevant to understand the likely impact of salt water intrusion and pH variation on phytoplankton communities in a tropical freshwater system.

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“…In most cases, resting stages are a survival mechanism for disturbances occurring on various timescales and can remain viable for up to about a century in sediments [eg. 7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Viable `banks' of phytoplankton resting stages have been reported from marine sediments all over the world, encompassing different ecosystems such as bays, coastal waters, estuaries, fjords, and polar regions, including examples from the bays/fjords of Scandinavia [12][13][14], United Kingdom [15], continental Europe [16), bays and coastal waters of Asia ' [9,[17][18], Mediteranean sea [19], Bering Sea [20], Arctic sea [21] and even after a century of dormancy from Koljo Fjord [12]. Freshwater studies have also recorded viability in resting stages ' [22] after decades in the sediments.…”

Section: Introductionmentioning

confidence: 99%

Responses of phytoplankton benthic propagules to macronutrient enrichment and varying light intensities: elucidation from monsoonal estuaries

Patil

Sathish

2021

Preprint

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The ecological importance of phytoplankton-benthic-propagules (PBP) from coastal sediments, except tropical-monsoonal-estuaries/coast, is well documented. Monsoonal estuaries recieves a high amount of benthic suspension (sediments, other detritus, PBP, and nutrients) due to high river-discharge during monsoon, bringing drastic changes in the environment (affecting water transparency, macronutrients concentration, and salinity), which in turn influence the plankton and phytoplankton per se. This study elucidates PBP germination and subsequent growth representing downstream, midstream, and upstream locations of monsoon-influenced Mandovi-Zuari riverine systems (Goa, India), to macronutrients (nitrate, phosphate, silicate, and in-combination) and light-intensities at higher salinity. Since, PBP, after introduction to estuary, experience higher salinity conditions with reduced river-discharge salinity of ~35 PSU was selected. Diatoms dominated the viable PBP community, but the maximum growth and sustained photosynthetic activity were observed when macronutrients were supplied in combination then individual supply. Here, the utility of the variable fluorescence technique in PBP resurrection (detection of viability and responses) was also explored. The PBP lag-period was similar for macronutrients but decreased with an increase in light-intensity. For PBP (germination and photosynthetic activity), light-intensities drive the rate of improvement/development, whereas the nutrients are essential for maintaining vegetative population upon germination. The PBP dominance of common planktonic species (Skeletonema and Thalassiosira) along the river also signifies the role of seawater intrusion in distribution. Both species are light-sensitive, responded similarly, and known to cause single species blooms and contributed significantly to the total community in the region, but on different occasions depending on the species tolerance to salinity.

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Effect of ageing on survival of benthic diatom propagules

Cited by 8 publications

References 21 publications

Phytoplankton Interannual Variability at Cassino Beach, Southern Brazil (1992–2007), with Emphasis on the Surf Zone Diatom Asterionellopsis glacialis

Phytoplankton Interannual Variability at Cassino Beach, Southern Brazil (1992–2007), with Emphasis on the Surf Zone Diatom Asterionellopsis glacialis

Impact of salinity and pH on phytoplankton communities in a tropical freshwater system: An investigation with pigment analysis by HPLC

Responses of phytoplankton benthic propagules to macronutrient enrichment and varying light intensities: elucidation from monsoonal estuaries

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