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Resource allocation of Halimeda macroloba Decaisnein relation to nitrogen and phosphorus enrichment |
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| รหัสดีโอไอ | |
| Creator | 1. Jaruwan Mayakun 2. Jeong Ha Kim 3. Brian E. Lapointe 4. Anchana Prathep |
| Title | Resource allocation of Halimeda macroloba Decaisnein relation to nitrogen and phosphorus enrichment |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2560 |
| Journal Title | Songklanakarin Journal of Science and Technology (SJST) |
| Journal Vol. | 39 |
| Journal No. | 3 |
| Page no. | 269 |
| Keyword | resource allocation,chemical concentration,Halimeda macroloba,nitrogen,phosphorus |
| ISSN | 0125-3395 |
| Abstract | Responses of Halimeda macroloba to growth and chemical concentrations when encountering elevated nutrientconcentrations were experimentally tested in the subtidal zone. To determine the effect of nutrients, algae were fertilized usingOsmocote? a slow-release fertilizer; the concentrations of nitrogen and phosphorus were enriched. A total of four treatmentswere manipulated: 1) enriched nitrogen that consisted of fertilizer (16-8-12 [N-P-K]); 2) enriched phosphorus (13-26-7[N-P-K]); 3) enriched nitrogen and phosphorus (14-14-14 [N-K-P]); and 4) an ambient concentration. It was shown that onlyphosphorus had a positive effect on the growth and polyphenol concentrations of Halimeda. The dry weight and the lengthof thallus were increased after one week in enriched phosphorus plots but decreased at the third week. Enriched phosphorusresulted in increases in the polyphenol concentrations at the third week; this suggested that when phosphorus was addedat the first week, Halimeda allocated more resources to growth than chemical concentrations, supporting predictions of thecarbon/nutrient balance hypothesis (CNBH). Nitrogen had a negative effect on the growth and polyphenol concentrationsof H. macroloba. For enriched both nutrients, the N+P had no effect on the dry weight, thallus length, and polyphenolconcentrations. From the tissue nutrient, the C:N:P ratios indicated that the productivity of H. macroloba was phosphoruslimited. |
