Growth models for Salvinia molesta

Toerien, D.F.; Cary, P. R.; Finlayson, C. Max; Mitchell, D.S.; Weerts, Peter G.J.

doi:10.1016/0304-3770(83)90092-x

Cited by 19 publications

(3 citation statements)

References 10 publications

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“…Salvinia molesta D.S. Mitch (giant salvinia) has also been shown to grow rapidly in growth media when nitrogen and phosphorus are elevated to 20 mg/1 and 2 mg/1, respectively (Toerien et al, 1983).…”

Section: Methodsmentioning

confidence: 99%

Physiological Responses of Salvinia Minima to Different Phosphorus and Nitrogen Concentrations

Al-Hamdani¹,

Sirna²

2008

American Fern Journal

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This study was designed to evaluate the effectiveness of salvinia [Salvinia minima) in accumulating nitrogen and phosphorus under different imitating eutrophic environments. Nitrogen concentrations of 1.0 (control), 10.0, and 100 mg/1 and phosphorus concentrations of 0.1 (control), 1.0, and 10.0 mg/1 were used in this study. Plants were grown under laboratory conditions at 25 ± 2 C with a light intensity of 120 umol/m 2 /s, and a 14 hr photoperiod. Salvinia's growth, expressed as frond production and plant fresh weight doubling time, was significantly increased with increasing nitrogen concentration from 1.0 mg/1 to 100.0 mg/1 in the growth media. The increase in growth rate was independent from the variation in phosphorus concentrations. However, the highest growth rate was obtained for days 1 through 7 when the levels of both nitrogen and phosphorus were elevated 100 fold (100 mg/1 N and 10.0 mg/1 P) from that of control

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Section: Methodsmentioning

confidence: 99%

Physiological Responses of Salvinia Minima to Different Phosphorus and Nitrogen Concentrations

Al-Hamdani¹,

Sirna²

2008

American Fern Journal

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“…However, few studies have sought to assess the nutrient concentrations in which an aquatic macrophyte reaches maximum growth. The nutrient concentrations for maximum growth of an aquatic macrophyte may be estimated by the Michaelis-Menten function that determines the half-saturation constant that corresponds to the nutrient concentration where productivity is onehalf of maximum productivity (Toerien et al, 1983;Davis and McDonnell, 1997;Carr et al, 1997). Recently, Thomaz et al (2007) observed that the growth of the submerged macrophyte Egeria najas Planch increased with increasing sediment nutrient up to certain concentrations of N and P. Above these concentrations, the authors reported no further plant growth.…”

Section: Introductionmentioning

confidence: 99%

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

Henares

Camargo

2014

Acta Limnol. Bras.

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Aim:To evaluate the growth of Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in tanks used for treating aquaculture effluent and compare the results with literature data in order to estimate the nutrients saturation point. Methods: An experiment with six rectangular fiberglass tanks were separated in two treatments, inflow and outflow (higher and lower nutrient concentration), and the two macrophytes above cited was carried out during 50 days. A floating quadrat with 0.25 m 2 of E. crassipes and S. molesta at inflow and outflow of the tanks was collected weekly for fresh mass measurement. At the beginning and end of the experiment samples of macrophytes were oven-dried at 60 °C until constant weight to determine the dry mass. Dry mass of plants was estimated by a simple linear regression analysis between fresh mass and dry mass (DM). Results: The N and P concentrations were significantly higher (P<0.05) in the inflow (mean of 0.66 mg L -1 and 233.6 mg L -1 , respectively) than in the outflow of the tanks (mean of 0.38 mg L -1 and 174.7 mg L -1 , respectively). However, no significantly different plant growth was observed for either higher or lower concentration. For both higher and lower nutrient concentrations, the biomass gain for E. crassipes was, respectively, 428.5 and 402.7 g DM.m 2 . For S. molesta, biomass gain was 135.2 and 143.1 g DM.m 2 , in the higher and lower concentrations, respectively. Others studies reported high growth of E. crassipes and S. molesta in concentrations of nitrogen (0.14 -0.18 mg L -1 ) and phosphorus (14.2 -77.0 mg L -1 ) lower than this study. Conclusion: The comparison of E. crassipes and S. molesta growth in this study with others allow us to assume that the saturation point of E. crassipes should be 0.26 mg L -1 of nitrogen and 77 mg L -1 of phosphorus and for S. molesta below 0.19 mg L -1 of nitrogen and 15.1 mg L -1 of phosphorus.Keywords: aquatic macrophytes, nutrients, growth, freshwater prawn, effluents.Resumo: Objetivo: Avaliar o crescimento de Eichhornia crassipes (Mart.) Solms e Salvinia molesta Mitchell em tanques utilizados para o tratamento de efluente de aquicultura e comparar os resultados com dados da literatura a fim de estimar o ponto de saturação de nutrientes. Métodos: Um experimento com seis tanques retangulares divididos em dois tratamentos, entrada e saída (maior e menor concentração de nutrientes, respectivamente), e as duas macrófitas aquáticas citadas acima foi realizado durante 50 dias. Um quadrante de 0,25 m 2 com amostras de E. crassipes e S. molesta da entrada e da saída dos tanques foi coletado semanalmente para estimar a massa fresca das macrófitas. No início e no final do experimento amostras das macrófitas foram secas em estufa a 60 °C até peso constante para determinar a massa seca. A massa seca das macrófitas foi estimada por regressão linear simples entre a massa fresca e a massa seca (MS). Resultados: As concentrações de N e P foram significativamente (P<0.05) 2014, vol. 26, no. 4, p. 420 -428 421 Estimating nit...

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“…and S. molesta Mitchell occur in the southern part of India and Kashmir. There are numerous investigations on their systematics (Mitchell, 1973;Mitchell & Thomas, 1972) ecology (Gopal, 1976;Room & Kerr, 1983), and growth and primary production (Room, 1983;Toerien et al, 1983), but decomposition rates are not well known. Therefore, the decomposition of two species, S. cucullata and S. molesta were studied with the following specific objectives: (a) Determination of the rate of dry weight loss in decomposition; (b) Sequence of release of mineral nutrients from the decomposing litter; (c) Interspecific differences in the decomposition processes.…”

Section: Introductionmentioning

confidence: 99%

Studies on decomposition of two species of Salvina

Sharma

Goel

1986

Hydrobiologia

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Decomposition of two species of Salvina, S. molesta Mitchell and S. cucullata Roxb. was studied for 220 days by the litter bag method. Salvinia molesta decomposes faster in the initial stages and S. cucullata in the later stages of decomposition. The release of nutrients is rapid during the first seven days and is ascribed to leaching. The rate of release of nutrients differs in the two species, with higher rates for P, Ca and Mg in S. molesta and for N in S. cucullata.

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Growth models for Salvinia molesta

Cited by 19 publications

References 10 publications

Physiological Responses of Salvinia Minima to Different Phosphorus and Nitrogen Concentrations

Physiological Responses of Salvinia Minima to Different Phosphorus and Nitrogen Concentrations

Estimating nitrogen and phosphorus saturation point for Eichhornia crassipes (Mart.) Solms and Salvinia molesta Mitchell in mesocosms used to treating aquaculture effluent

Studies on decomposition of two species of Salvina

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