Influence of macrophytes on sediment phosphorus accumulation in a eutrophic estuary (Palmones River, Southern Spain)

Palomo, Laura; Clavero, Vicente; Izquierdo, Juan José; Avilés, Antonio; Becerra, Joaquín; Niell, F. Xavier

doi:10.1016/j.aquabot.2004.08.004

Cited by 21 publications

(4 citation statements)

References 23 publications

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“…However, the measurement of SRP misses these important Pi polymers than are non-molybdenum sensitive. The green macroalga Ulva pseudorotundata occurs in dense mats in the intertidal mudflats of the Palmones river estuary (Southern Spain) [29], reducing not only underneath light availability [33], but also (more than 40 times) the net phosphorus flux from sediment to the water column [34]. As cited above, this sediment may contain not only Pi, but also inorganic polymeric forms, that, as evidenced in our study, can support U. pseudorotundata growth.…”

Section: Ecological Implicationssupporting

confidence: 76%

Use of Polyphosphates and Soluble Pyrophosphatase Activity in the Seaweed Ulva pseudorotundata

Vergara

Herrera-Pérez

Brun

et al. 2020

Oceans

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The hydrolytic activity of different types of polyphosphates, and the induction of soluble pyrophosphatase (sPPase; EC 3.6.1.1) activity have been assessed in cell extracts of nutrient limited green seaweed Ulva pseudorotundata Cormaci, Furnari & Alongi subjected to different phosphorus regimes. Following a long period of nutrient limitation, the addition of different types of (poly)phosphates to artificial seawater enhanced growth rates on fresh weight and area, but not on dry weight bases. Chlorophyll and internal P content were affected by P supply. In contrast, internal soluble reactive P was kept low and was little affected by P additions. Soluble protein content increased in all treatments, as ammonium was added to prevent N limitation. The C:N:P atomic ratio revealed great changes depending on the nutrient regime along the experiment. Cell extracts of U. pseudorotundata were capable of hydrolyzing polyphosphates of different chain lengths (pyro, tripoly, trimeta, and polyphosphates) at high rates. The sPPase activity was kept very low in P limited plants. Following N and different kind of P additions, sPPase activity was kept low in the control, but slightly stimulated after 3 days when expressed on a protein basis. The highest activities were found at the end of the experiment under pyro and polyphosphate additions (7 days). The importance of alternative P sources to phosphate and the potential role of internal soluble pyrophosphatases in macroalgae are discussed.

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Section: Ecological Implicationssupporting

confidence: 76%

Use of Polyphosphates and Soluble Pyrophosphatase Activity in the Seaweed Ulva pseudorotundata

Vergara

Herrera-Pérez

Brun

et al. 2020

Oceans

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“…Decayed macrophytes are likely to be the major source of organic matter to soil in macrophyte beds. Water level drawdown therefore has the potential to replenish the soil organic matter in macrophyte beds (Kleeberg & Heidenreich, ; Palomo et al., ). The replenished soil organic matter from decayed macrophytes may also serve as a continuous slow‐release nutrient source to the water column after rewetting.…”

Section: Discussionmentioning

confidence: 99%

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

et al. 2017

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Macrophytes play a key role in assimilating and storing nutrients in shallow aquatic ecosystems, but their capacity to act as a long‐term nutrient sink can be affected by water level fluctuations. Water level drawdown in reservoirs followed by rewetting may mobilise a significant nutrient pool. These nutrients can be stored in the littoral zone in dead or dormant macrophytes, and in the desiccated sediments within the macrophyte beds. However, the contribution of desiccated macrophyte beds to nutrient release upon rewetting has not been well quantified. Our study examined the effect of rewetting the previously desiccated waterlily Nymphoides indica (Menyanthaceae) in treatments (1) without sediments (N.i.−Sed), and (2) with sediments in N. indica beds (N.i.+Sed) on water quality. We found that longer drying duration increased dissolved nutrients (nitrate/nitrite, ammonium and total dissolved organic nitrogen/phosphorus) and organic carbon release from N.i.+Sed and N.i.−Sed treatments after rewetting. In the N.i.+Sed treatment with <4 weeks of desiccation, all N. indica plants regenerated from roots after subsequent rewetting. In addition, the resulting nutrient/carbon release was not significantly different to the control treatment which did not have desiccation. A significant increase in dissolved nutrient and carbon concentrations in the water column was found in treatments with more than 10 weeks of desiccation followed by rewetting. This coincided with the sediment reaching its minimum moisture content. Furthermore, chlorophyll a (Chl‐a) concentrations in the overlying water also increased with more than 10 weeks of desiccation, presumably in response to the increased nutrient availability and the removal of competition for nutrients from macrophytes. On the basis of our laboratory experiments, we calculated the potential effect of desiccated and rewetted N. indica beds on water quality in a local N. indica‐dominated reservoir after water level drawdown. We also separated the contribution of N. indica plants from their macrophyte beds on water quality changes. Fourteen days after rewetting, the total dissolved nutrients released from N. indica alone (N.i.−Sed) could contribute 0.5% of the total nitrogen and 29% of total phosphorus to the water column concentrations in the whole reservoir. In contrast, N. indica beds (N.i.+Sed) contributed more total dissolved nitrogen (4.3%) but less total dissolved phosphorus (0.3%) release into the water column. The higher nitrogen release for the N.i.+Sed treatment was likely due to the organic matter decomposition in the sediment in macrophyte beds. In contrast, the less dissolved phosphorus release, compared with the N. indica alone, was likely the result of phosphate adsorption by previously desiccated soil particles and/or assimilation by phytoplankton, since the phytoplankton biomass (as measured by Chl‐a concentrations) was significantly higher in the N.i.+Sed treatment. This study highlights the importance of managing both the duration and rate of water l...

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“…Since the 1980s several studies have been carried out in the estuary of Palmones River in order to characterize the nutrient concentration in water column and sediments and the progressive eutrophication (Clavero, Fernández, & Niell, 1992;Izquierdo, 2001;Palomo et al, 2004). However, no studies relating to the seasonal inputs from the river and the role of the dam have been made.…”

Section: Introductionmentioning

confidence: 98%

The Control of a Small Dam in Nutrient Inputs to a Hypertrophic Estuary in a Mediterranean Climate

Avilés

Niell

2006

Water Air Soil Pollut

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A two-year study was carried out in the lower part of the Palmones River to describe the role of a small dam controlling the nutrient fluxes to the estuary. Results showed an important spatial heterogeneity in the nutrient content and water properties of lowland catchment due to the effects of the small dam and the effluents of a sewage treatment work. Taking into account the values of hydraulic retention time, the dam could be considered as an optimally dimensioned pre-dam. Therefore, it removed on average more than 25% of total phosphorus (TP) while no net removal was obtained for TN during the studied period. Palmones River exported 11.3 TonsP year −1 of TP and 72.1 TonsN year −1 of TN to the estuary showing important seasonal differences. Less than 10% from the total amount of nutrient was exported during low flow conditions, while in four months with important flooding events, the percentage of total nitrogen exported exceeded 64%.

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Influence of macrophytes on sediment phosphorus accumulation in a eutrophic estuary (Palmones River, Southern Spain)

Cited by 21 publications

References 23 publications

Use of Polyphosphates and Soluble Pyrophosphatase Activity in the Seaweed Ulva pseudorotundata

Use of Polyphosphates and Soluble Pyrophosphatase Activity in the Seaweed Ulva pseudorotundata

Macrophyte beds in a subtropical reservoir shifted from a nutrient sink to a source after drying then rewetting

The Control of a Small Dam in Nutrient Inputs to a Hypertrophic Estuary in a Mediterranean Climate

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