The effect of nitrogen content on methane production by the marine algae Gracilaria tikvahiae and Ulva sp.

Habig, Clifford; DeBusk, Thomas A.; Ryther, John H.

doi:10.1016/0144-4565(84)90037-4

Cited by 55 publications

(29 citation statements)

References 10 publications

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“…The C/N ratio of the feedstock is an important parameter when evaluating the potential of a given biomass for anaerobic digestion (Yen and Brune 2007), which is the most promising and best described technology for converting U. lactuca biomass into bioenergy (Bruhn et al 2011). An optimum C/N ratio is still debatable, but the majority find it to be in the range of 20-30 (Yen and Brune 2007;Habig et al 1984;Parkin and Owen 1986). Anaerobic digestion of biomass with considerably lower C/N ratios leads to ammonia accumulation and increases in pH, providing a toxic environment for the methanogenic bacteria.…”

Section: Discussionmentioning

confidence: 97%

Cultivation of Ulva lactuca with manure for simultaneous bioremediation and biomass production

et al. 2011

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Section: Discussionmentioning

confidence: 97%

Cultivation of Ulva lactuca with manure for simultaneous bioremediation and biomass production

et al. 2011

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“…Nitrogen effects on the chemical composition of G . tikvahiae also may be important in other applications, such as fermentation to methane (Habig & Ryther, 1984 ;Habig et al, 1984a).…”

Section: Nutrient Managementmentioning

confidence: 99%

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

Hanisak

1990

Hydrobiologia

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Seaweeds have physiological mechanisms to acquire, utilize, and store various forms of nitrogen in environments where nitrogen levels vary tremendously in space and time . Knowledge of the nitrogen relationships of seaweeds is required for the development of successful seaweed mariculture . For example, it would seem at first that continuous nitrogen enrichment would be desirable in such systems because maximal seaweed yields are possible only when growth is not nitrogen-limited . Yet such fertilization is wasteful and can result in yield reductions due to the enhancement of epiphyte growth . Because most seaweeds can rapidly taken up high concentrations of nitrogen, far in excess of what is required for current growth demands, enrichments are needed only when internal nitrogen concentrations fall to near the critical level (i .e ., the minimal tissue concentration of nitrogen required for maximal growth) . Nutrients are best applied at brief pulses of high nitrogen concentrations .

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“…In many seaweeds, as soon as total N-content of the thallus falls below a critical level, their growth rates decrease while their polysaccharide levels increase (Smit et al 1996). Seasonality also determines the C/N ratio in both Ulva and Gracilaria, with high carbohydrate contents and low protein levels ruling under nitrogen limitation (Rosenberg 1982;Habig et al 1984, Lobban 1994. Since nitrogen limitation affects both the composition and content of intracellular chemicals, as well as growth rate, the nitrogen requirements of cultivated seaweeds have to be determined depending on the use of the biomass.…”

Section: Introductionmentioning

confidence: 98%

Growth, protein and carbohydrate contents in Ulva rigida and Gracilaria bursa-pastoris integrated with an offshore fish farm

2015

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Low-technology practices are generally the rule when cultivating marine macroalgae, and they do not necessarily comply with sustainability requirements. When integrated with other marine organisms in land-based setups, seaweed culture can be sustainable also providing environmental benefits. Major challenges of such integrated aquaculture systems, however, are in sea-based setups. The current study examined the growth rates of Ulva rigida and Gracilaria bursa-pastoris, as well as their protein and carbohydrate contents, when exposed to different distances from an offshore, fed-fish cage system. Nutrient levels in seawater were consistently high downstream from the fish cages, significantly enhancing the specific growth rates and cellular contents of starch and soluble protein in these two seaweeds. Specifically, daily maximal growth rates were 17 % day −1 for U. rigida and 10 % day −1 for G. bursa-pastoris, maximal starch contents were 22 and 21 %, respectively, and maximal protein contents were on a dry weight basis 7 and 13 %, respectively. When repositioned at low ambient nutrient levels for 48 h, the starch and the carbohydrate levels increased by 129 and 131 % for U. rigida and by 198 and 150 % for G. bursa-pastoris, respectively. Altogether, this study supports implementing future viable mean of sustainable macroalgae cultivation by taking advantage of excessive nutrients released from an offshore fish farm.

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The effect of nitrogen content on methane production by the marine algae Gracilaria tikvahiae and Ulva sp.

Cited by 55 publications

References 10 publications

Cultivation of Ulva lactuca with manure for simultaneous bioremediation and biomass production

Cultivation of Ulva lactuca with manure for simultaneous bioremediation and biomass production

The use of Gracilaria tikvahiae (Gracilariales, Rhodophyta) as a model system to understand the nitrogen nutrition of cultured seaweeds

Growth, protein and carbohydrate contents in Ulva rigida and Gracilaria bursa-pastoris integrated with an offshore fish farm

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