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Effect of temperature on 'N' uptake of Chaetomorpha linum (Muller) and Padina tetrastomatica (Hauck)

DRS at CSIR-National Institute of Oceanography

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Title Effect of temperature on 'N' uptake of Chaetomorpha linum (Muller) and Padina tetrastomatica (Hauck)
 
Creator Raikar, V.
Wafar, M.V.M.
 
Subject aquatic plants
temperature effects
growth
environmental factors
ammonium compounds
nitrates
urea
lagoons
Chaetomorpha linum
Padina tetrastomatica
 
Description Macroalgal species (Chaetomorpha linum and Padina tetrastomatica) collected from the Kavaratti lagoon (lat. 10 deg. 33 min. 16 sec. N and long. 72 deg. 38 min. 34 sec E) were brought to the laboratory and cleaned with filtered seawater. 0.5 g of algal thallus was placed in the beakers with 50 ml of seawater to which ammonium, nitrate and urea were added separately at the concentrations of 2, 5 and 10 mu M in the form of NH4Cl, KNO3 and urea respectively. Measurements of uptake of N as a function of temperature were tested at 4 different temperatures (20, 25, 30 and 35 degrees C). The irradiance measured during the incubation period was 276 mu E m sup(-2) s sup(-1). The duration of each experiment was 1 h. The experiments were carried out in duplicates. At the end of the experiment the algae were retrieved, oven dried at 70 degrees C and weighed. Technicon II autoanalyser was used for ammonium, nitrate and urea measurement using methods described by Koroleff (1970), Wood et al. (1967) and Aminot and Keroule (1982) respectively. Uptake was calculated based on the depletion of added nutrient from the experimental medium. Under all the combinations of temperature and N species, the uptake rate of NH sub(4) sup(+) was greater than that of NO sub(-3) sup(-) and urea.
 
Date 2008-02-12T04:35:00Z
2008-02-12T04:35:00Z
2006
 
Type Journal Article
 
Identifier Seshaiyana, Vol.14; 1-2p.
http://drs.nio.org/drs/handle/2264/808
 
Language en
 
Rights Copyright [2006]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher ENVIS, India