Spatial distributions of biogeochemical parameters in surface sediments

Ostrovsky, Ilia; Wynne, David; Dan, T. Bergstein Ben; Nishri, A.; Li, H.; Yacobi, Yosef Z.; Koren, Nir; Parparova, R.

doi:10.1007/bf02406889

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…The appearance of Bchl e in the ULBS in October-November indicated that the collected sediments were of recent origin, as this pigment was not found during sampling done in May-June (Ostrovsky et al 1997). Compared with previous samplings (Ostrovsky et al 1997;Yacobi and Ostrovsky 1998), the rapid increase in concentrations of photosynthetic pigments and other organic compounds in the hypolimnetic sediments apparently resulted from a decline in the rate of OM decomposition as anoxic conditions developed (e.g., Leavitt 1993).…”

Section: Contribution Of Phototrophic Organisms To Sedimentary Om Belmentioning

confidence: 76%

“…Compared with previous samplings (Ostrovsky et al 1997;Yacobi and Ostrovsky 1998), the rapid increase in concentrations of photosynthetic pigments and other organic compounds in the hypolimnetic sediments apparently resulted from a decline in the rate of OM decomposition as anoxic conditions developed (e.g., Leavitt 1993). During the period of about 4 months preceding our sampling time, 5-7 mm of the ULBS could have accumulated on the bottom at a sedimentation rate of 2-3 g DM·m -2 ·day -1 , characteristic of the lake center (Klein and Koren 1998).…”

Section: Contribution Of Phototrophic Organisms To Sedimentary Om Belmentioning

confidence: 96%

“…The tendency to modify settled material increases as sampling is performed in deeper (i.e., older) parts of the sediment core. Fresh sediments, however, convey information about the recent history of sinking phytoplankton and may be used to study the distribution of settled matter in bottom sediments (Hurley and Armstrong 1990;Ostrovsky et al 1997).…”

Section: Introductionmentioning

confidence: 99%

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Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Ostrovsky¹,

Yacobi²

1999

Can. J. Fish. Aquat. Sci.

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The analysis of spatial changes of organic matter and pigments (chlorophyll a, chlorophyll b, bacteriochlorophyll e, and phaeophytin a) in the uppermost bottom sediments was used to distinguish between sources of settled material in Lake Kinneret (Israel) during thermal stratification. The proportion of phytobenthic chlorophyll a decreased relatively to total chlorophyll a down to zero at 17 m. Bacteriochlorophyll e, derived from Chlorobium phaeobacteroides, was the most abundant pigment below the thermocline. Organic matter content in the sand-free sediment fraction and chlorophyll a to organic matter ratio were the lowest in the bottom area most extensively affected by shoaling internal seiches and where resuspension occurred. The proportion of resuspended matter sharply decreased with bottom depth in the hypolimnion. The importance of degraded materials of planktonic origin apparently increased towards the lake center. These distribution patterns could be achieved by dispersion of the rapidly sinking resuspended particles with fast metalimnetic jets and by focusing of the lighter planktonic particles by water motions in the turbulent benthic boundary layer. Our study showed that analysis of distribution of freshly settled organic components on the bottom may be a useful tool for understanding particle transport mechanisms in lakes.Résumé : L'analyse des variations spatiales de la matière organique et des pigments (chlorophylle a, chlorophylle b, bactériochlorophylle e et phéophytine a) dans la couche supérieure des sédiments du fond a été utilisée pour distinguer les sources des matières déposées dans le lac Kinneret (Israël) durant la stratification thermique. La proportion de chlorophylle a phytobenthique diminuait relativement à la chlorophylle a totale pour devenir nulle à 17 m. La bactériochlorophylle e, issue de Chlorobium phaeobacteroides, était le pigment le plus abondant sous la thermocline. La teneur en matière organique dans la fraction de sédiments exempte de sable et le ratio chlorophylle a à matière organique étaient les plus faibles dans la région du fond la plus touchée par les seiches internes qui balayent les hauts fonds et là où se produisait une remise en suspension. La proportion de matière remise en suspension diminuait abruptement en raison directe de la profondeur du fond dans l'hypolimnion. La quantité de matières dégradées d'origine planctonique s'accroissait apparemment vers le centre du lac. Ces profils de distribution pourraient être attribuables à la dispersion par des jets métalimnétiques rapides des particules remises en suspension qui descendent rapidement et à la concentration des particules planctoniques plus légères par les mouvements de l'eau dans la couche limite benthique turbulente. Notre étude a montré que la distribution des composantes organiques fraîchement déposées sur le fond peut aider à comprendre les mécanismes de transport des particules dans les lacs.[Traduit par la Rédaction] Ostovsky and Yacobi 1010 Fig. 7. Hypothetical scheme of bottom sediment formation in...

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Section: Contribution Of Phototrophic Organisms To Sedimentary Om Belmentioning

confidence: 76%

Section: Contribution Of Phototrophic Organisms To Sedimentary Om Belmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Ostrovsky¹,

Yacobi²

1999

Can. J. Fish. Aquat. Sci.

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“…, 1999; Kumke, Schoonderwaldt & Kienel, 2005; Schiefer, 2006). Physical and chemical heterogeneity is linked to the heterogeneity of flora, fauna and microbiota in the sediment at different scales (Downing & Rath, 1988; Lang, 1989; Ostrovsky et al. ,1997; Peeters, Gylstra & Vos, 2004), which in turn affects sediment CO 2 production.…”

Section: Discussionmentioning

confidence: 99%

Effects of temperature and sediment properties on benthic CO₂ production in an oligotrophic boreal lake

et al. 2010

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1. Temperature and many other physical and chemical factors affecting CO 2 production in lake sediments vary significantly both seasonally and spatially. The effects of temperature and sediment properties on benthic CO 2 production were studied in in situ and in vitro experiments in the boreal oligotrophic Lake Pääjärvi, southern Finland. 2. In in situ experiments, temperature of the water overlying the shallow littoral sediment varied seasonally between 0.5 and 15.7°C, but in deep water ( ‡20 m) the range was only 1.1-6.6°C. The same exponential model (r 2 = 0.70) described the temperature dependence at 1.2, 10 and 20 m depths. At 2.5 and 5 m depths, however, the slopes of the two regression models (r 2 = 0.94) were identical but the intercept values were different. Sediment properties (wet, dry, mineral and organic mass) varied seasonally and with depth, but they did not explain a significantly larger proportion of variation in the CO 2 output rate than temperature. 3. In in vitro experiments, there was a clear and uniform exponential dependence of CO 2 production on temperature, with a 2.7-fold increase per 10°C temperature rise. The temperature response (slope of regression) was always the same, but the basic value of CO 2 production (intercept) varied, indicating that other factors also contributed to the benthic CO 2 output rate. 4. The annual CO 2 production of the sediment in Lake Pääjärvi averaged 62 g CO 2 m )2 , the shallow littoral at 0-3 m depth releasing 114 g CO 2 m )2 and deep profundal (>15 m) 30 g CO 2 m )2 . On the whole lake basis, the shallow littoral at 0-3 m depth accounted for 53% and the sediment area in contact with the summer epilimnion (down to a depth c. 10 m) 75% of the estimated total annual CO 2 output of the lake sediment, respectively. Of the annual production, 83% was released during the spring and summer. 5. Using the temperature-CO 2 production equations and climate change scenarios we estimated that climatic warming might increase littoral benthic CO 2 production in summer by nearly 30% from the period 1961-90 to the period 2071-2100.

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“…It should be mentioned that the uppermost layer of pelagic and sublittoral bed sediments of LK is enriched with organic matter (Serruya 1978;Koren 1993;Ostrovsky et al 1997). Hence resuspension of these sediments into the BBL may lead to heterotrophic microbial activity in this water layer.…”

Section: Turbidity In the Bblmentioning

confidence: 99%

The physical regime and the respective biogeochemical processes in the lower water mass of Lake Kinneret

Nishri

Imberger

Eckert

et al. 2000

Limnology & Oceanography

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Physical measurements made in Lake Kinneret, during the stratified period, indicate that the lower water mass (LWM) consists of two layers: a turbulent benthic boundary layer (BBL) and a hypolimnetic layer overlying the BBL. The water in the LWM moves in response to vertical mode one seiching of the metalimnion; this movement is accentuated near the perimeter of the metalimnion due to shoaling of the seiche and breaking of internal waves. The motion associated with this phenomena induce a well mixed benthic boundary layer (BBL) adjacent to the lake bottom. The BBL and hypolimnion were distinguished chemically because transport of solutes between these water bodies was very small. Compared to the hypolimnion, the BBL was characterized by more intensive biomineralisation processes as indicated by the faster depletion of DO and NO 3 , by higher levels of NH 4 , H 2 S, and soluble reactive phosphorus (SRP) and by lower pH values. SRP levels in the hypolimnion were particularly low, suggesting that phosphorus was either preferentially removed by sedimentation from the hypolimnion, or it was not released from particles. As a result NH 4 over SRP ratios in the hypolimnion were significantly higher than in the BBL and diffusional fluxes of both nutrients from the LWM to the trophogenic epipelagic water, should therefore be characterized by relatively high N/P ratios.

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Spatial distributions of biogeochemical parameters in surface sediments

Cited by 7 publications

References 19 publications

Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Effects of temperature and sediment properties on benthic CO₂ production in an oligotrophic boreal lake

The physical regime and the respective biogeochemical processes in the lower water mass of Lake Kinneret

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Spatial distributions of biogeochemical parameters in surface sediments

Cited by 7 publications

References 19 publications

Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Organic matter and pigments in surface sediments: possible mechanisms of their horizontal distributions in a stratified lake

Effects of temperature and sediment properties on benthic CO2 production in an oligotrophic boreal lake

The physical regime and the respective biogeochemical processes in the lower water mass of Lake Kinneret

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Effects of temperature and sediment properties on benthic CO₂ production in an oligotrophic boreal lake