Sedimentation of phosphorus in limnetic and estuarine environments in the River Öre system, northern Sweden

Forsgren, Gunilla; Jansson, Mats

doi:10.1007/978-94-011-1598-8_28

Cited by 11 publications

(12 citation statements)

References 21 publications

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“…Armengol & Vidal (1988) also showed by means of linear regression equations, that apatite -P was closely related to water inflows in Sau reservoir. Other studies (Psenner & Pucsko 1988;Forsgren & Jansson 1993), have yielded similar results in estuaries and lakes.…”

Section: Discussionsupporting

confidence: 67%

“…Thus it could be possible that certain mineralogic material sorbs P from the reservoir water during sedimentation and this P is extractable by strong acid. If so, the common interpretation of the P extracted with HO aforementioned, should be revised, as has also been commented by Forsgren & Jansson (1993). Further studies should be performed to test this possible explanation.…”

Section: Variations In the C:p Ratiomentioning

confidence: 89%

“…Although sedimentation is considered one of the major routes by which PP is removed from the productive layer, little is known about the factors that regulate the magnitude and composition of P in the settling seston. The association of P with mineral, rather than biological particles, has been largely ignored, despite indications that in hard water systems (Koschel et al 1983) and those influenced by riverine input (Forsgren & Jansson 1993), mineral phases may compete with algae and bacteria for available P.…”

Section: Introductionmentioning

confidence: 99%

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Sedimentation of phosphorus fractions and temporal variation in the C:P ratio in La Concepción reservoir, southern Spain

García‐Ruiz

Parra

Guerrero

et al. 2001

New Zealand Journal of Marine and Freshwater Research

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The settling flux and content of organic carbon (C), organic matter, and different phosphorus (P) fractions were measured fortnightly during a 6-month stratified period (from early April to early November) with sediment traps located at five different depths in La Concepcion, a mesotrophic and P-limited reservoir in southern Spain. Characterisation of P fractions in the collected material was performed by a sequential extraction procedure. Sedimentation rates exhibited a distinct seasonal pattern, that allowed us to differentiate three periods: (1) a biogenic sedimentation period (BS), in which the sedimentation rates and total suspended matter concentration were lowest and the result of material of autochthonous origin; (2) a calcium carbonate precipitation period (CCP), in which there were high calcium concentrations in the settling seston; and (3) a rainfall period (R), in which the highest sedimentation rates occurred. Organic C, organic matter, and organic P content were highest *Author for correspondence. M00079

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Section: Discussionsupporting

confidence: 67%

Section: Variations In the C:p Ratiomentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Sedimentation of phosphorus fractions and temporal variation in the C:P ratio in La Concepción reservoir, southern Spain

García‐Ruiz

Parra

Guerrero

et al. 2001

New Zealand Journal of Marine and Freshwater Research

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“…The very large drainage area (2173 km 2 ) consists mainly of mires and coniferous forests. Anthropogenic influences on water quality are negligible (Forsgren & Jansson, 1993). The lake is covered by ice from December until mid‐May and thermal stratification usually develops in the beginning of June and lasts until early September.…”

Section: Methodsmentioning

confidence: 99%

Primary production and phytoplankton composition in relation to DOC input and bacterioplankton production in humic Lake Örträsket

et al. 2002

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1. The biomass and production of picophytoplankton, large phytoplankton and heterotrophic bacterioplankton were measured in humic Lake Örträsket, northern Sweden during four consecutive summers. 2. High flow episodes, carrying fresh dissolved organic carbon (DOC) into the lake, always stimulated heterotrophic bacterial production at the expense of primary production. Primary production never exceeded bacterial production for approximately 20 days after such an episode had replenished epilimnial DOC. We suggest that allochthonous DOC is an energy source that stimulates bacterioplankton that, because of their efficient uptake of inorganic nutrients, are then able to outcompete phytoplankton. After the exhaustion of readily available DOC, phytoplankton were able to dominate epilimnion production in Lake Örträsket. 3. Biomass production was higher when dominated by phytoplankton than by bacterioplankton, despite a similar utilization of nutrients in the epilimnion throughout the summer. We propose that different C : N : P ratios of bacterioplankton and phytoplankton permit the latter to produce more carbon (C) biomass per unit of available inorganic nutrients than bacterioplankton.

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“…Such accumulation of fine material reduces the permeability of the sediment drastically , Forster et al 2003 and can ultimately exclude advective pore water flow, leaving diffusion and potentially bioirrigation as the main transport mechanisms of matter into the sediment. Sandy sediments in the Öre (April) and 11 (August) profiles (weighted-average gridding, quality limit 3, non-linear colour scale) using Ocean Data View (Schlitzer 2015 Estuary are prone to clogging of pore space due to the silt-and clay-dominated riverine particle load (Forsgren & Jansson 1993) and the long particle retention time within the estuary (>1 yr; Brydsten & Jansson 1989). The large amount of suspended fine particles that enters the estuary mainly during the spring flood (Brydsten & Jansson 1989) was evident in the 60% higher proportion of fine material at N14 in April than in August.…”

Section: Estuarine Sediment Characteristics and Oxygenmentioning

confidence: 99%

Denitrification in an oligotrophic estuary: a delayed sink for riverine nitrate

Hellemann¹,

Tallberg²,

Bartl

et al. 2017

Mar. Ecol. Prog. Ser.

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Estuaries are often seen as natural filters of riverine nitrate, but knowledge of this nitrogen sink in oligotrophic systems is limited. We measured spring and summer dinitrogen production (denitrification, anammox) in muddy and non-permeable sandy sediments of an oligotrophic estuary in the northern Baltic Sea, to estimate its function in mitigating the riverine nitrate load. Both sediment types had similar denitrification rates, and no anammox was detected. In spring at high nitrate loading, denitrification was limited by likely low availability of labile organic carbon. In summer, the average denitrification rate was ~138 μmol N m. The corresponding estuarine nitrogen removal for August was ~1.2 t, of which ~93% was removed by coupled nitrification−denitrification. Particulate matter in the estuary was mainly phytoplankton derived (> 70% in surface waters) and likely based on the riverine nitrate which was not removed by direct denitrification due to water column stratification. Subsequently settling particles served as a link between the otherwise uncoupled nitrate in surface waters and benthic nitrogen removal. We suggest that the riverine nitrate brought into the oligotrophic estuary during the spring flood is gradually, and with a time delay, removed by benthic denitrification after being temporarily 'trapped' in phytoplankton particulate matter. The oligotrophic system is not likely to face eutrophication from increasing nitrogen loading due to phosphorus limitation. In response, coupled nitrification−denitrification rates are likely to stay constant, which might increase the future export of nitrate to the open sea and decrease the estuary's function as a nitrogen sink relative to the load.

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Sedimentation of phosphorus in limnetic and estuarine environments in the River Öre system, northern Sweden

Cited by 11 publications

References 21 publications

Sedimentation of phosphorus fractions and temporal variation in the C:P ratio in La Concepción reservoir, southern Spain

Sedimentation of phosphorus fractions and temporal variation in the C:P ratio in La Concepción reservoir, southern Spain

Primary production and phytoplankton composition in relation to DOC input and bacterioplankton production in humic Lake Örträsket

Denitrification in an oligotrophic estuary: a delayed sink for riverine nitrate

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