Inorganic phosphorus uptake in a carbonate-dominated seagrass ecosystem

Nielsen, Ole I.; Koch, Marguerite S.; Madden, Christopher J.

doi:10.1007/bf02841337

Cited by 11 publications

(9 citation statements)

References 36 publications

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“…This phosphate limitation would reduce the occurrence of phosphate-solubilizing bacterial populations as they may not have enough substrates to work and solibilize them. This is one of the main reasons for the seagrasses to prefer more water column inorganic phosphate than the sediment component as reported by Nielsen et al (2007). Presence of bacterial strains in the seagrass root/rhizome indicated the possibility of existence of this strain as endophytes; however, this has to be confirmed further.…”

Section: Discussionmentioning

confidence: 75%

Isolation and characterization of phosphate-solubilizing bacteria from seagrass rhizosphere soil

Ghosh

Subhashini

Dilipan

et al. 2011

J. Ocean Univ. China

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Phosphate-solubilizing bacterial strains (6 Nos.) were isolated from the rhizosphere soils of two seagrasses (Halophila ovalis (R. Br.) Hook and Halodule pinifolia (Miki) Hartog) in the Vellar estuary. Experimental studies found that the strain PSSG6 was effective in phosphate solubilization with Phosphate Solubilization efficiency index E = 375 ± 8.54, followed by the strain PSSG5 with Phosphate Solubilization efficiency index E = 275 ± 27.3. Of the 6 strains isolated, the strains PSSG4 and PSSG5 belonged to the genus Bacillus, and PSSG1, PSSG2 and PSSG3 were identified as Citrobacter sp., Shigella sp., and Klebsiella sp., respectively, by conventional method, and PSSG6 was identified as Bacillus circulans using conventional and molecular methods.

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Section: Discussionmentioning

confidence: 75%

Isolation and characterization of phosphate-solubilizing bacteria from seagrass rhizosphere soil

Ghosh

Subhashini

Dilipan

et al. 2011

J. Ocean Univ. China

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“…Indeed, A. antarctica collected from Cockburn Sound, Western Australia, took up more nutrients from the water column through leaves than from the sediment through roots (Pedersen et al 1997). Seagrass leaves can take up inorganic P in the water column at nano-molar concentrations (Nielsen et al 2007), suggesting that, although low in P, the water column can still provide adequate concentrations of P to meet seagrass demands where there is a constant, albeit low, supply. Quantities of P available for uptake would presumably be increased due to the fast (up to 8 kn) tidal currents across the Faure Sill (Walker et al 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Thus, these currents could consistently replenish P around seagrass leaves, and alleviate potential P limitation of seagrasses. Furthermore, seagrasses can take up inorganic P at a faster rate than it can be adsorbed to calcareous sediments (Nielsen et al 2007). As such, sediment nutrient concentrations may not accurately reflect the bioavailability of nutrients to seagrasses.…”

Section: Discussionmentioning

confidence: 99%

Nutrient status of seagrasses cannot be inferred from system-scale distribution of phosphorus in Shark Bay, Western Australia

Fraser

Kendrick

Grierson

et al. 2012

Mar. Freshwater Res.

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Differences in phosphorus (P) availability can influence the ecology and physiology of seagrass communities; and are usually inferred from changes in the relative P content in seagrass leaves. Shark Bay is a subtropical marine embayment, with decreasing P concentrations in the water column and sediments from north to south across the entire embayment. We examined the P and nitrogen (N) content of seagrass leaves and P content of sediments across the Faure Sill and Wooramel delta region of Shark Bay, to determine whether the leaf content of seagrasses in Shark Bay also decreased from north to south over smaller spatial scales. Nutrient content of Amphibolis antarctica and Halodule uninervis were highly variable and were not strongly correlated with sediment P concentrations. Mean N : P ratios of seagrasses (<33.5) were not indicative of P limitation, as has been previously assumed for Shark Bay. We conclude that availability of P for uptake by seagrasses across Shark Bay may be highly localised and cannot be predicted from system-scale gradients (>100 km) of sedimentary P distributions. We suggest that P availability to seagrasses is more likely a complex function of differing nutrient inputs, rates of delivery to the plants and cycling rates.

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“…For roots at site XCB and below-sediment tissues in site SYB, seagrasses can obtain several times their N requirements and many times their P requirements from the porewater. Thus, T. hemprichii in the southeastern region of Hainan Island seems not to be P i limited, which is different from other tropical and subtropical seagrass beds that were reported as P i limited (Fourqurean & Zieman, 1992;Jensen et al, 1998;Koch et al, 2001;Nielsen et al, 2006Nielsen et al, , 2007.…”

Section: Nutrient Budget For T Hemprichiimentioning

confidence: 80%

Comparison of the role of the foliar sheath in nutrient (ammonium and phosphate) acquisition by the seagrass Thalassia hemprichii (Ehrenb.) Aschers. at two different sites on tropical Hainan Island, China

et al. 2011

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Comparison of the role of the foliar sheath in nutrient (ammonium and phosphate) acquisition by the seagrass Thalassia hemprichii (Ehrenb.) Aschers. at two different sites on tropical Hainan Abstract Generally, the foliar sheaths of seagrass contribute a large biomass to the dry weight of plants, and are found to be above-sediment biomass or, sometimes, below-sediment biomass. However, the role of foliar sheaths of seagrass in nutrient uptake has not yet been established. Thus, this study was performed to test whether the growth form of foliar sheaths affects the nutrient uptake properties of the seagrass. Two separate sets of morphotypes of the seagrass Thalassia hemprichii were collected from two different tropical meadows in coastal Hainan Island, China in the South China Sea. Ammonium (NH 4 ? ) and phosphate (P i ) uptake by solely blades and roots (experiment I), and above and belowsediment tissues (experiment II) of the two sets of specimens were examined in partitioned chambers using laboratory incubations. Curve profiles of the blade and root saturation uptake kinetics were shown to be similar for the two morphotypes of T. hemprichii. However, the above and below-sediment tissues uptake kinetics had different characteristics between the two morphotypes. For plants with above-sediment foliar sheaths, uptake by the above-sediment tissues contributed an important part of the whole plants' nutrient acquisition. In contrast, for plants with below-sediment foliar sheaths, the contribution of nutrient uptake by above-sediment foliar blade tissues seemed almost negligible. Therefore, the results demonstrated that foliar sheaths of the tropical seagrass T. hemprichii were able to absorb NH 4 ? and P i . Especially interesting is that the capacity for uptake by robust foliar sheaths growing beneath the sediment was remarkable (we termed this the Zhang-Huang-Thorhaug effect). The role of sheaths in nutrient acquisition found in this study is critical in elucidating seagrass nutrient uptake strategies.

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Inorganic phosphorus uptake in a carbonate-dominated seagrass ecosystem

Cited by 11 publications

References 36 publications

Isolation and characterization of phosphate-solubilizing bacteria from seagrass rhizosphere soil

Isolation and characterization of phosphate-solubilizing bacteria from seagrass rhizosphere soil

Nutrient status of seagrasses cannot be inferred from system-scale distribution of phosphorus in Shark Bay, Western Australia

Comparison of the role of the foliar sheath in nutrient (ammonium and phosphate) acquisition by the seagrass Thalassia hemprichii (Ehrenb.) Aschers. at two different sites on tropical Hainan Island, China

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