Diatom Assemblages in Surface Sediments Along Nutrient and Salinity Gradients of Thi Vai Estuary and Can Gio Mangrove Forest, Southern Vietnam

Costa-Böddeker, Sandra; Thuyên, Lê Xuân; Schwarz, Anja; Huy, Hoàng Đức; Schwalb, Antje

doi:10.1007/s12237-016-0170-5

Cited by 22 publications

(10 citation statements)

References 56 publications

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“…In the present study, we detected Navicula antonii and Nitzschia frustulum in all habitats with different salinity. Although N. antonii and N. frustulum species are generally defined as freshwater species, they have also been identified in Ebro Estuary which is a salt wedge estuary in the Mediterranean (Rovira et al, 2009;Costa-Böddeker et al, 2017). Our results confirmed their euryhaline characteristics based on their presence in the basin from fresh to saline habitats.…”

Section: Discussionsupporting

confidence: 83%

Composition and Distribution of Benthic Diatoms in Different Habitats of Burdur River Basin

Albay

2020

Turkish Journal of Water Science and Management

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Diatoms constitute an essential component for biomonitoring studies to determine the ecological quality of waterbodies. In this study, benthic diatoms of Burdur River Basin were investigated as a consequence of a project on river basin management plan. This is the first detailed taxonomical study of diatoms taken from 13 streams, 4 lakes and 6 reservoirs of Burdur River Basin and a total of 223 taxa have been observed. Among genera, Navicula Bory (27) and Nitzschia Hassal (27) were represented with the highest numbers of taxa and followed by Gomphonema Agardh with a total of 22 species. Navicula antonii Lange-Bertalot and Nitzschia palea var. debilis (Kützing) Grunow had the highest relative abundance with 17.1% and 15.5% respectively. As a closed basin, salinity varied greatly from fresh to saline water between the sampling stations and diatom composition contained species with a different tolerance level. Navicula antonii and Nitzschia frustulum (Kützing) Grunow observed in all habitats indicating their euryhaline characters; however Navicula digitoconvergens was only detected in saline Acıgöl lake with a high relative abundance (38%) in autumn. Other two dominant species were Halamphora coffeiformis (Kützing) Levkov and Navicula cincta (Ehrenberg) Ralfs in Acıgöl lake showing their tolerance to high salt content as a brackish species. According to first results, 11 species were new records for Turkish diatom flora. The high biodiversity of diatoms revealed the presence of different habitat characteristics within the basin. These results are an important contribution of Turkish diatom flora and could be useful for monitoring specific areas like Burdur River Basin.

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Section: Discussionsupporting

confidence: 83%

Composition and Distribution of Benthic Diatoms in Different Habitats of Burdur River Basin

Albay

2020

Turkish Journal of Water Science and Management

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“…It has been reported that the salt concentration in the soil water of the Can Gio mangrove forest is constantly below 3% (w/v) (Tuan and Kuenzer 2012;Costa-Böddeker et al 2017). As a result, bacterial strains in the soil of mangrove forests are mainly halotolerant and moderately halophilic (Van-Thuoc et al 2012).…”

Section: Discussionmentioning

confidence: 99%

“…In general, the soil water salinity in mangrove forests is dynamic and depends on the fresh water input. In the Can Gio mangrove forest, water salinity is high during dry season, reaching peaks of 2.5-3% in March and April, but decreases during the rainy season to only 0.5-1% (Tuan and Kuenzer 2012;Costa-Böddeker et al 2017). Many different microorganisms, including bacteria, fungi, protozoa, and algae, have been found in mangrove ecosystems (Holguin et al 2001;Van-Thuoc et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Identification and characterization of ectoine-producing bacteria isolated from Can Gio mangrove soil in Vietnam

2019

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The aim of this study was to characterize high ectoine-producing bacteria obtained from Can Gio mangrove soil samples in Vietnam. Methods Ectoine-producing bacteria were isolated from mangrove soil samples. The selected strains were identified using 16S rDNA sequence analysis, and their biochemical characteristics were also examined. The ability to produce ectoine at different NaCl concentrations and the effect of osmotic downshock solution on ectoine's release rates and survival rates for the selected bacterial strains were investigated. Results Among more than 200 bacterial colonies isolated from soil samples, two strains exhibiting highest ectoine production (strains D227 and D228) were chosen for further studies. Both strains D227 and D228 were identified as Halomonas spp. and were closely related to Halomonas organivorans, sharing 99.4% 16S rDNA sequence similarity. At 6% (w/v) NaCl concentration, strains D227 and D228 presented the highest cell dry weight (CDW) of 3.85 and 3.55 g/l, respectively. At 18% NaCl concentration, maximum total ectoine (ectoine and hydroxyectoine) production of 16.4 and 18.1 wt% was achieved by strains D227 and D228, respectively. After 30 min of incubation in downshock solution containing 5% NaCl, high bacterial survival rates of 96% and 98%, and ectoines release rates of 61% and 76% were obtained by strains D227 and D228, respectively. Conclusions The accumulation and secretion of ectoine appear to be a typical adaptation strategy of some bacteria to survive under the changing saline conditions of mangrove ecosystem. To the best of our knowledge, this is the first report on ectoine production by halophilic bacteria isolated from mangrove soil. High ectoine-producing bacteria can be found in mangrove forest.

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“…pavillardii in terms of taxonomic and ecological features. The species inhabit the sandy sediments of marine coasts (Witkowski et al 2000) and has also been reported to frequently occur in brackish areas (Costa-Böddeker et al 2017). Cyclotella litoralis (IndVal = 0.56) was identified as a seawater indicator species.…”

Section: Indicator Species At Hypersaline Environmentsmentioning

confidence: 98%

Shift in benthic diatom community structure and salinity thresholds in a hypersaline environment of solar saltern, Korea

Bae¹,

Park²,

Ahn³

et al. 2020

ALGAE

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Diatom Assemblages in Surface Sediments Along Nutrient and Salinity Gradients of Thi Vai Estuary and Can Gio Mangrove Forest, Southern Vietnam

Cited by 22 publications

References 56 publications

Composition and Distribution of Benthic Diatoms in Different Habitats of Burdur River Basin

Composition and Distribution of Benthic Diatoms in Different Habitats of Burdur River Basin

Identification and characterization of ectoine-producing bacteria isolated from Can Gio mangrove soil in Vietnam

Shift in benthic diatom community structure and salinity thresholds in a hypersaline environment of solar saltern, Korea

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