Nutrient cycling associated with the seagrass <i>Halophila ovalis</i> in the Swan–Canning Estuary based on seasonal variations in biomass and tissue nutrients

Connell, Emma L.; Walker, Diana

doi:10.1002/hyp.291

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…Posidonia) do (Walker et al 1999). Halophila is extremely adaptable to change or stresses and is able to rapidly increase chlorophyll content and photosynthetic rates to make use of available conditions (Connell and Walker 2001).…”

Section: Discussionmentioning

confidence: 99%

Nutrient requirements of in vitro cultured Halophila ovalis and Posidonia coriacea: nitrogen source

Wilson

Bennett

2007

Plant Cell Tiss Organ Cult

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Axenic cultures of Posidonia coriacea and Halophila ovalis were established to investigate the effect of nitrogen addition and the optimum concentration of MS (Murashige and Skoog Physiol Plant 15:473-497, 1962) macronutrients, micronutrients and organics. Chlorophyll content and dissolved oxygen of H. ovalis was optimal at the control concentration of macronutrients (half strength MS). Below and above this concentration, growth of this species was compromised. A similar effect was observed for H. ovalis growth in response to MS micronutrient. However, changing the MS vitamins concentration had no impact on the growth of H. ovalis or P. coriacea. Leaf and root numbers of H. ovalis were highest in the treatment with the most nitrogen (50.6 mM). Root architecture of H. ovalis was affected by nitrogen source; shorter roots without root hairs were produced when NH 4 NO 3 was present in the media. Longer roots with root hairs were produced when the cultures were grown in the absence of NH 4 NO 3 . P. coriacea growth did not exceed that of the control for any of the treatments. The response of H. ovalis to nutrient addition suggests its opportunistic nature, whereas the lack of response by P. coriacea suggests there may be some other limiting factor. This study shows that the proposed formulation of ½ strength MS can be suitable for both H. ovalis and P. coriacea.

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Section: Discussionmentioning

confidence: 99%

Nutrient requirements of in vitro cultured Halophila ovalis and Posidonia coriacea: nitrogen source

Wilson

Bennett

2007

Plant Cell Tiss Organ Cult

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“…Higher leaf phosphate concentrations for plants with reduced growth rate may be due to either conservation (recycling from old to new growth), or increased phosphorus availability. Seasonal variation of tissue nutrient concentration is common for H. ovalis, with higher tissue nitrogen and phosphorus in winter than in summer (Hillman et al 1995, Connell & Walker 2001. The proposed linear regression model of growth, with leaf phosphorus and internode distance as predictors, requires further testing to allow for the effects of season, but it important to note that leaf phosphorus increases as a stress response.…”

Section: Discussionmentioning

confidence: 99%

Changes in growth, internode distance and nutrient concentrations of the seagrass Halophila ovalis with exposure to sediment sulphide

Kilminster¹,

Walker²,

Thompson³

et al. 2008

Mar. Ecol. Prog. Ser.

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Sulphide concentrations in estuarine sediments are likely to increase with increased organic matter fluxes (eutrophication) and increased temperatures (global warming). The short-term effects of sulphide on the growth, nutrition and morphology of the seagrass Halophila ovalis (R.Br.) Hook. f. were investigated in situ. Sediments within a H. ovalis meadow were enriched with Na 2 S equivalent to 0, 1.1 and 4.2 g m -2. Sulphide diffusion tubes were estimated to increase sulphide concentrations by 1 to 4 mmol l -1 , concentrations typical of elevated sulphide measured in natural systems. Biomass, internode distance and growth rate (mg apex -1 day -1 ) were determined, and plant material was analysed for soluble carbohydrate, carbon, nitrogen and phosphorus. Sulphide exposure caused significant reduction in growth (63%), average leaf weight (30%) and internode distance (15%). Above-ground tissue phosphorus concentration and internode distance were significant predictors of growth (R 2 = 0.63, p < 0.01). These results demonstrate the plasticity of H. ovalis in response to a short-term sulphide pulse, and may have implications for recovery from transient sulphide stress.

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“…Oxygen release in the root microzone raises the oxidation-reduction potential of sediment, however, causing precipitation of ferric and manganic oxyhydroxides on or around plant roots, which may reduce diffusion of these elements to the overlying water (Jaynes & Carpenter, 1986). The existence of these microzones is likely to provide opportunities for greater diversity of the microbial flora and a range of associated redox transformations (Connell & Walker, 2001).…”

Section: Discussionmentioning

confidence: 99%

Influence of Potamogeton crispus growth on nutrients in the sediment and water of Lake Tangxunhu

Zhu

Zhou

et al. 2007

Hydrobiologia

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An incubation experiment was performed on Potamogeton crispus (P. crispus) using sediment collected from Lake Tangxunhu in the center of China, in order to determine the effects of plant growth on Fe, Si, Cu, Zn, Mn, Mg, P, and Ca concentrations in the sediments and overlying waters. After 3 months of incubation, Ca, Mg, and Si concentrations in the water column were significantly lower, and P and Cu concentrations were significantly higher than in unplanted controls. The effect of P. crispus growth on sediment pore waters and water-extractable elements varied. Concentrations of Ca, Mg, Si, Fe, Cu, and Zn were significantly higher, and P was significantly lower, than in pore waters of the control. Waterextracted concentrations of Fe, Mg, and Si in the sediments were lower, and P was higher, than in the control. Presence of P. crispus generally enhanced concentration gradients of elements between pore waters and overlying waters but not for P. The growth of P. crispus was associated with an increase in water pH and formation of root plaques, resulting in complex effects on the sediment nutritional status.

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Nutrient cycling associated with the seagrass Halophila ovalis in the Swan–Canning Estuary based on seasonal variations in biomass and tissue nutrients

Cited by 8 publications

References 42 publications

Nutrient requirements of in vitro cultured Halophila ovalis and Posidonia coriacea: nitrogen source

Nutrient requirements of in vitro cultured Halophila ovalis and Posidonia coriacea: nitrogen source

Changes in growth, internode distance and nutrient concentrations of the seagrass Halophila ovalis with exposure to sediment sulphide

Influence of Potamogeton crispus growth on nutrients in the sediment and water of Lake Tangxunhu

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