Probable causes for cyanobacterial expansion in the Baltic Sea: Role of anoxia and phosphorus retention

Westman, Per; Borgendahl, Johanna; Bianchi, Thomas S.; Chen, Nianhong

doi:10.1007/bf02711979

Cited by 20 publications

(14 citation statements)

References 35 publications

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“…These values are significantly higher than concentrations in the surface sediment at our sites (where values are <3 lmol/g). An alternative explanation for the difference between our results for surface sediments and those of Westman et al (2003) is the transformation of organic P to authigenic Ca-P during long-term burial, as demonstrated for other anoxic coastal settings (e.g. Filippelli, 2001).…”

Section: Redox-dependent P Burialcontrasting

confidence: 51%

“…While conditions for formation of authigenic Ca-P are apparently unfavorable in the present-day Baltic, this may have been different in the past: for example, Westman et al (2003) observed significant concentrations of authigenic Ca-P (up to 10 to 20 lmol/g) in sediments deposited in the Bornholm basin between ca. 2000-5000 yrs before present.…”

Section: Redox-dependent P Burialmentioning

confidence: 90%

See 1 more Smart Citation

Phosphorus recycling and burial in Baltic Sea sediments with contrasting redox conditions

Mort

Slomp

Gustafsson

et al. 2010

Geochimica et Cosmochimica Acta

191

168

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Section: Redox-dependent P Burialcontrasting

confidence: 51%

Section: Redox-dependent P Burialmentioning

confidence: 90%

Phosphorus recycling and burial in Baltic Sea sediments with contrasting redox conditions

Mort

Slomp

Gustafsson

et al. 2010

Geochimica et Cosmochimica Acta

191

168

View full text Add to dashboard Cite

“…Indeed, our study showed that non-nitrogen-fixing unicellular Synechococcus was a typical taxon emerging during the Litorina Sea phase. The combined pigment and nitrogen data suggested that filamentous nitrogen-fixing cyanobacteria were also important primary producers during the Litorina transgression [29]. However, based on our results filamentous nitrogen-fixing cyanobacteria, such as Nodularia , were characteristic of the younger Late Litorina Sea.…”

Section: Discussionmentioning

confidence: 47%

Sediment Bacterial Communities Reflect the History of a Sea Basin

et al. 2013

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How entire microbial communities are structured across stratified sediments from the historical standpoint is unknown. The Baltic Sea is an ideal research object for historical reconstruction, since it has experienced many fresh- and brackish water periods and is depleted of dissolved oxygen, which increases the sediment's preservation potential. We investigated the bacterial communities, chemical elements (e.g. Cr, Pb Na, P, Sr and U) and sediment composition in a stratified sediment core dated by radiocarbon and spanning 8000 years of Baltic Sea history, using up-to-date multivariate statistics. The communities were analysed by 16S rRNA gene terminal restriction fragment length polymorphism. The communities of the deep Early Litorina and surface Late Litorina Sea laminae were separated from the communities of the middle Litorina Sea laminae, which were associated with elevated concentrations of U and Sr trace elements, palaeo-oxygen and palaeosalinity proxies. Thus, the Litorina Sea laminae were characterized by past oxygen deficiency and salinity increase. The communities of the laminae, bioturbated and homogeneous sediments were differentiated, based on the same historical sea phases, with correct classifications of 90%. Palaeosalinity was one of the major parameters that separated the bacterial communities of the stratified sediments. A discontinuous spatial structure with a surprising increase in community heterogeneity was detected in Litorina Sea sediments from 388 to 422 cm deep, which suggests that a salinity maximum occurred in the central Gulf of Finland app. 6200–6600 years ago. The community heterogeneity decreased from the surface down to 306 cm, which reflected downcore mineralization. The plateau of the decrease was in the app. 2000-year-old sediment layers. Bacterial community data may be used as an additional tool in ocean-drilling projects, in which it is important to detect mineralization plateaus both to determine historically comparable portions of sediment samples and historical events, such as sea-level rise culminations.

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“…The injector was connected via a guard column to a RP-18 LiChroCART column (5 lm particle size, 250 9 4.6 mm internal diameter). The gradient (1 ml min -1 ) program started with 100% mobile phase A (80:20 methanol:0.5 M ammonium acetate v/v ratio) after injection (50 ll;Westman et al 2003). This was followed by 100% mobile phase B (90:10 acetonitrile:water v/v ratio) for 4 min, and to 25% B and 75% C (100% ethyl acetate) for 28 min.…”

Section: Methodsmentioning

confidence: 99%

“…The annual water inflow is of the order of 3.12 million cubic meters and retention time is 2.5 years. The major lithology around the lake area is constituted of metavolcanics and quartzites (Valdiya 1988).…”

Section: Study Areamentioning

confidence: 99%

Organic geochemical record of increased productivity in Lake Naukuchiyatal, Kumaun Himalayas, India

2009

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Organic geochemical proxies have been studied in a 45-cm-long core retrieved from Lake Naukuchiyatal in Kumaun Himalayas, India. Increase in TOC, N, hydrocarbons and pigments concentration from bottom to surface sediments of the core indicates increase in the lake productivity. Stable isotopes (d 13 C and d 15 N), biomarkers (TAR,17,19 ) and C/N atomic (between 9 and 12) suggest dominance of algal derived organic matter in these sediments. Decrease in organic d 13 C values (between -27 and -31%) in surface sediments indicate influence of sewage and land runoff in shifting organic d 13 C values, whereas low (between -0.23 and 2.2%) d 15 N values together with high pigment concentrations (zeaxanthin and echinenone) represent dominance of cyanobacteria in the lake.

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Probable causes for cyanobacterial expansion in the Baltic Sea: Role of anoxia and phosphorus retention

Cited by 20 publications

References 35 publications

Phosphorus recycling and burial in Baltic Sea sediments with contrasting redox conditions

Phosphorus recycling and burial in Baltic Sea sediments with contrasting redox conditions

Sediment Bacterial Communities Reflect the History of a Sea Basin

Organic geochemical record of increased productivity in Lake Naukuchiyatal, Kumaun Himalayas, India

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