Solute Movement in Submerged Angiosperms

Denny, Patrick

doi:10.1111/j.1469-185x.1980.tb00688.x

Cited by 130 publications

(52 citation statements)

References 97 publications

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“…Uptake and accumulation of mineral elements in submerged plant tissue largely depends upon the nutrients in water surrounding the plants (Sculthorpe, 1967;Denny, 1980). This is confirmed by multiple regression analysis ( Table 3) which shows that all nutrient elements except nitrogen strongly depended on the nutrient content of water.…”

Section: Discussionmentioning

confidence: 82%

Relationship of nutrients in water with biomass and nutrient accumulation of submerged macrophytes of a tropical wetland

Shardendu

Ambasht

1991

New Phytologist

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SUMMARVThe paper describes monthly hiomass, seasonal and annual net primary productivity and monthly and seasonal nutrient content of four submerged macrophytes in a lentic wetland situated in the campus of Banaras Hindu University. The seasonal variation of six nutrients (NO3 -N, PO,"-?, K, Ca, Mg, Na) in water is described and their mean concentrations used in multiple regression equations to examine the relationship between nutrients in water, plant biomass and nutrient accumulation in plant body. Hydrilla verticillata (L.f.) Royle, Potamogeton crispus L., P. pectinatus L. and Aponogeton natans (L.) Engle and Krause are the constituent species. Plants show rapid growth in post-monsoon and pre-winter months. All the four species showed biomass accumulation in the rainy season. The highest rate of production in the submerged zone was 0 73 g m~^ d"' and the mmimum was 0-29 g m"^ d"'. Maximum annual production of any species was 69 g m"" in P. pectinatus. In all the four species the nutrient concentration decreased in the following order: calcium > nitrogen > potassium > magnesium > sodium > phosphorus. Seasonal variation of nutrient content was dependent on the period of germination, growth and development of the species. Nitrogen, phosphorus and potassium were higher in the season of growth of particular species and calcium was higher when plants matured. There was no definite trend for sodium, though magnesium varied with species. Uptake and accumulation of nutrients in submerged plants largely depend upon nutrient concentration of water, except nitrogen which was also dependent on biomas change. Sources of nutrient for plants are both sediment and water. Translocation of potassium from the overlying water to the mud by Hydrilla plants is possible as there is reduction in potassium concentration of water around Hydrtlla.

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Section: Discussionmentioning

confidence: 82%

Relationship of nutrients in water with biomass and nutrient accumulation of submerged macrophytes of a tropical wetland

Shardendu

Ambasht

1991

New Phytologist

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“…This same dualltv of 1989): (1) direct uptake from the water column or (2) uptake from the interstitial pathways exists for other solutes (e g phosphorus) and both accumulation routes may be operative in the same plant (Denny 1980) In a fleld situation it is clearly difficult to distinguish between the 2 possible uptake vectors the least ambiguous 'integrator' of metal bioavailability in the sediments will be the metal levels in the underground pal t of the plant, including the roots and rhizomes, and simple I elatioilships between metal concentrations in the plant and total metal concentrations In the sedi-I I ments were rarely observed, as underlined by Campbell & Tessier (1989). Nevertheless, very low, which minimises its role in metal storage.…”

Section: Discussionmentioning

confidence: 99%

Memorization of heavy metals by scales of the seagrass Posidonia oceanica, collected in the NW Mediterranean

Roméo¹,

Gnassia‐Barelli²,

Juhel³

et al. 1995

Mar. Ecol. Prog. Ser.

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Concentrations of Cd, Cu, Fe, Pb and Zn were measured in scales of the seagrass Posidonia oceanica from different areas of the French NW Mediterranean: the Cbte d'Azur and Corsica.Scales are basal parts of the seagrass which remain fixed on the rhizomes when leaves of P. oceanica die. Scales do not decay and the cyclic variation of their thickness permits retroactive dating (lepidochronology). Heavy metal concentrations were determined in the scales of P. oceanlca dated by lepidochronology. Scales from P. oceanica collected from the CBte d'Azur (analysis of lepidochronological years from 1982 to 1992) generally showed concentrations of Cu. Fe. Pb and Zn to be greater lharr those measured in samples from Corsica (analysis of lepidochronological years from 1972 to 1992).In contrast, Cd concentrations recorded in scales from Corsica were higher than in those from Cbte d'Azur. The reasons for these high Cd values are unknown. There was a general tendency for metal concentrations in P oceanlca scales collected on the C6te d'Azur to decrease with time. In Villefranchesur-Mer, where there are many pleasure boats, large concentrations of Cu were found in P. oceanica scales. These concentrations had increased in recent years.

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“…grass primary producers (Powell et al 1989;Short et al 1990;Fourqurean et al 1992b) regardless of the fact that seagrass similar to other submerged aquatic plants can sequester nutrients from both roots and leaves (Patriquin 1972;Carignan and Kalff 1980;Rattray et al 1991). While both above-and below-ground tissues participate in nutrient sequestration, it is commonly purported that seagrasses meet their nutritional demand for P by acquiring Pi through root uptake (Denny 1980;Brix and Lyngby 1985). However, this paradigm has been established based on studies from mesotrophic seagrass systems in both temperate and tropical locations, where concentrations of Pi in pore water tend to exceed those in the overlying surface waters, sometimes by orders of magnitude (Carignan and Kalff 1980;Bulthus and Woelkerling 1981;Stapel et al 1996).…”

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confidence: 99%

Thalassia testudinum phosphate uptake kinetics at low in situ concentrations using a 33P radioisotope technique

et al. 2006

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A new 33 P-tracer technique was used to define low-level phosphate (Pi) uptake kinetics for a dominant tropical seagrass, Thalassia testudinum. We established seagrass Pi uptake kinetics at high (western Bay) and low (eastern Bay) nutrient sites in a fine-grained carbonate lagoon of south Florida (Florida Bay), where P limitation of seagrass has been documented. Sediment Pi adsorption kinetics were also investigated to test whether carbonate sediments could sequester Pi to the threshold levels we established for T. testudinum, defined as S min or the physiological threshold value where Pi uptake is positive. At Pi levels characteristic of Florida Bay (Յ0.26 mol L Ϫ1), leaf and root Pi uptake was linear with increasing levels of Pi, and similar affinities (␣) were found for leaves and roots (0.12-0.30 and 0.10-0.20 mol g dry weight Ϫ1 h Ϫ1). S min for roots and leaves was extremely low (0.004-0.009 mol L Ϫ1 ) regardless of the P status of the site. While T. testudinum was able to take up Pi at nanomolar levels, the uptake rates were insufficient for plant requirements. Thus, sediment pools or transient fluxes of P to the water column must sustain high seagrass production rates in the Bay. Sediment adsorption-desorption equilibrium for Pi was 10-fold lower in the eastern versus western Bay sites, meeting Ͻ10% and Ͼ87% of the P demand for T. testudinum, respectively, a result that might account for the reported P limitation of seagrass biomass and production in eastern Florida Bay.

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Solute Movement in Submerged Angiosperms

Cited by 130 publications

References 97 publications

Relationship of nutrients in water with biomass and nutrient accumulation of submerged macrophytes of a tropical wetland

Relationship of nutrients in water with biomass and nutrient accumulation of submerged macrophytes of a tropical wetland

Memorization of heavy metals by scales of the seagrass Posidonia oceanica, collected in the NW Mediterranean

Thalassia testudinum phosphate uptake kinetics at low in situ concentrations using a 33P radioisotope technique

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