Effects of light intensity on the growth of Cryptomonas sp. (Cryptophyceae)
| Autor: | Huan Xin Weng, Ya Chao Qin, Xiang Wei Sun, Jing Feng Chen, Xun Hong Chen |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Global and Planetary Change
biology Phosphorus General Engineering Soil Science chemistry.chemical_element Geology biology.organism_classification Pollution Algal bloom Light intensity Nutrient Algae chemistry Aquatic plant Environmental chemistry Botany Earth and Planetary Sciences (miscellaneous) Environmental Chemistry General Earth and Planetary Sciences Growth rate Absorption (electromagnetic radiation) Earth-Surface Processes Water Science and Technology General Environmental Science |
| Zdroj: | Environmental Geology. 57:9-15 |
| ISSN: | 1866-6299 0943-0105 |
| DOI: | 10.1007/s00254-008-1277-1 |
| Popis: | Laboratory culture experiments have been conducted to evaluate the effects of light intensity on the growth of Cryptomonas sp. (Cryptophyceae) and the discrepancy in absorption of iron and phosphorus under different light conditions. Results show that there is an exponential correlation between algal growth rate and light intensity. The saturating and semi-saturating light values for Cryptomonas sp. cells are 150 and 47 μmol photons m−2 s−1, respectively. More uptake of Fe, P, and other trace elements such as Zn, Mn, Co, and Mo is observed in the low light cultures, although the algal growth rates are slow. The growth rate at 10 μmol photons m−2 s−1 is only 10% of that at 150 μmol photons m−2 s−1, whereas Fe and P uptake increases by 150 and 100%, respectively. These results suggest potential implications of differentiation in absorption of iron and phosphorus at different light intensities for the occurrence of harmful algal blooms (HABs). The mechanisms of light intensity regulating nutrient uptake as well as the occurrence of HABs are also discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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