Taburan spesies sargassum di Pulau Pinang dan beberapa faktor persekitaran yang :mempengaruhi fisiologi fotosintesis dan tumbesaran sargassum stolon~folium
| dc.contributor.author | Dahalan, Ahmad Zahurl Bin | |
| dc.date.accessioned | 2015-09-23T05:00:16Z | |
| dc.date.available | 2015-09-23T05:00:16Z | |
| dc.date.issued | 2001-12 | |
| dc.description.abstract | A research was carried out to determine the distribution of the Sargassum spp. in Penang waters and the physiological photosynthesis of Sargassum stolonifolium. Three Sargassum species were found in Penang waters and they are S. stolonifolium, S. s1vartzii and S. crassifolium. All three species were found at Batu Feringhi whereas at Muka Head · were two species namely S. stolonifolium and S. swartzii and at Sungai Batu only S. crassifolium was present. S. stolonifolium was chosen for the study on \. physiological photosyhthesis as this species is the most dominant and was found in all I the three locations. The study on physiological photosyhthesis has shown that th~ physical and chemical enviroment in which S. stolonifolium survives is the most suitable environment for photosynthethic process and growth. The rate of the photosynthesis of S. stolonifolium increases with increase in light intensities and reaches a maximum at 745 - 755 jlmol photon m·2 s·1 at the rate of 416.0 jlmol02/gfw/h. Temperature is also a factor that influences the rate of photosynthysis where 25 °C is the optimum temperature for S. stolonifolium. The salinity which is most conducive for growth of S. stolonijolium is 30 %o. The efficiency of photosynthesis occurs differently throughout the day (24 hours) and this shows the circadian rhythm which is controlled by the biological clock. This study also shows that the rate of photosynthesis of S. stolonifolium is not influenced by the light intensity but . . by the sircadian rhythm. Dessication is also a factor which influence the growth rate and photosynthesis of S. stolonifolium in the laboratory as well as in the field. Exposure of the S. stolon{folium to ambient temperature for more than 60 minutes will kill it. The growth rate, the content of chlorophyll a and c and the photosynthetic rate of S. stolonifolium which survives above the intertidal zone was lower compared to those below the zone. The results in the sequence factors above were at 33.7% compared 51.4% for those found below the sea level. The chlorophyll a was higher at 0.58 ± 0.2 mg/gfw/h abQve intertidal compared 0.46 ± 0.04 mg/gfw/h below while for chlorophyll c was lower 0.08 ± 0.05 mg/gfw/h above compared to 0.13 ±0.02 mg/gfw/h below the intertidal zone. The rate of photosynthesis was higher at 538.8 ± 16.2 J.Lmol photon m·2 s·1 above intertidal compared at 322.3 ± 15.0 J.Lmol photon m"2 s"1 below the intertidal zone. The water depth was also found to be a factor influencing the photosynthetic rate, the content of chlorophyll a and c and the growth rate of S. stolonifolium . The maximum photosynthesis rate was found at 0.3m depth whereas for growth the depth of 0.3m and surface area_ were the most suitable. The content of chlorophyll a increased with the increase in depth. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/1223 | |
| dc.language.iso | other | en_US |
| dc.subject | Spesies sargassum | en_US |
| dc.subject | Beberapa faktor persekitaran | en_US |
| dc.subject | Fisiologi fotosintesis | en_US |
| dc.subject | Tumbesaran sargassum stolonfolium | en_US |
| dc.title | Taburan spesies sargassum di Pulau Pinang dan beberapa faktor persekitaran yang :mempengaruhi fisiologi fotosintesis dan tumbesaran sargassum stolon~folium | en_US |
| dc.type | Thesis | en_US |
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