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http://nopr.niscpr.res.in/handle/123456789/25516| Title: | Seasonal variations in growth and spore -production of marine brown algae Padina boergesenii and P. tetrastromatica (Dictyotales/Phaeoeopyhyta) in the Mandapam region, southeast coast of India |
| Authors: | Ganesan, M Mairh, O P Rao, P V Subba |
| Issue Date: | Sep-2000 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Growth of Padina boergesenii Allander and Kraft and P. tetrastromatica Hauck in Mandapam region were studied monthly for two years along with seasonal variation in tetraspore shedding and diurnal periodicity of spore output for P. boergesenii. Two peaks in biomass were observed with maximum biomass of P. boergesenii during January '93/February'94 (2500 g fr.wt./m2 and 4200 g fr.wt./m2) and again a small peak during July'93/August ,94 (1200 g fr.wt./m2 and 1300 g fr.wt./m2). Maximum biomass of P. tetrastromatica was recorded during January'95 (740 g fr.wt/m2) and February'95 (730 g fr.wt./m2) and again a second peak in May'93 (410 g fr.wt./m2). Relative growth rate (RGR g fr.wt./day) varied from 0.003 to 0.07 in P. boergesenii and 0.006 to 0.07 in P. tetrastromatica. Extension growth rate (EGR mm/day) ranged from 0.1 to 2.6 in P. boergesenii and 0.1 to 2.06 in Padina tetrastromatica. Tetraspore output in P. boergesenii showed distinct seasonal periodicity with two peaks, one in December/January'93 (19,260/g fr.wt. and 6300/g fr.wt) and another peak in August'94 (32,261/g fr.wt) . Diurnal periodicity in spore liberation showed maximum number of spores (1538/g fr.wt) released during night hours between 2200 and 0200 hrs. The present study on biomass and sporulation suggests single harvest in a year during January and February may not disturb natural population of P.boergesenii and P. tetrastromatica in the intertidal habitats. The present study also revealed ideal season (December and August) and time (2200-0200 hrs) for bulk collection of tetraspores to start cultivation of the algae from the spores. |
| Page(s): | 253-257 |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Appears in Collections: | IJMS Vol.29(3) [September 2000] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJMS 29(3) 253-257.pdf | 1.23 MB | Adobe PDF | View/Open |
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