Fatty acid composition of more brown seaweeds (Phaeophyta) from the coast of Karachi

Six species of multicellular, thalloid, brown algae, belonging to five genera of the classes Laminariophyceae and Fucophyceae were collected from the coastal areas of Buleji near Karachi (Pakistan) during October 1997 and February 1998. They were extracted in chloroform: methanol, saponified, subjected to column chromatography (CC, TLC), esterified and analysed for fatty acid (FA) composition initially by gas-liquid-chromatography (GLC) and finally by gas chromatography-mass spectrometry (GC-MS). They displayed only a few SCFAs, PUFAs and substituted FAs, no VLCFA, C22 UFA, CFA, DCFA and monoynoic FA, large amount of CI6:0, very large quantity of C18:1, very small RCCL and FA-diversity, C18 UFAs up to four DBs, C20 UFAs up to three DBs only. They were characterized by the largest amount of C18:1, lowest degree of unsaturation of C20 UFAs, lack of C22 UFAs, the shortest RCCL and the smallest FA-diversity as compared to other phyla

Fatty acid composition of some brown seaweeds (Phaeophyta) from the coast of Karachi

Ten species of filamentous and multicellular thalloid algae (Phaeophyta) belonging to six genera of the class Dictyophyceae were collected from different seawater habitats of Karachi, Pakistan at the northern boundary of the Arabian Sea during September 1997 and July 1998. They were extracted in chloroform: methanol, saponified, subjected to column chromatography (CC, TLC), esterified and analysed for fatty acid (FA) composition initially by gas-liquid-chromatography (GLC) and finally by gas chromatography-mass spectrometry (GC-MS). Algae of the classes Laminariophyceae and Fucophyceae (Phaeophyta) displayed only a few SCFAs, PUFAs and substituted FAs, no VLCFA, C22 UFA, CFA, DCFA and monoynoic FA, large amount of C16:0, very large quantity of C18:1, very small RCCL and FA-diversity, C18 UFAs up to four DBs, C20 UFAs up to three DBs only. They were characterized by the largest amount of C18:1, lowest degree of unsaturation of C20 UFAs, lack of C22 UFAs, the shortest RCCL and the smallest FA-diversity as compared to other phyla

Distribution of wave heights in Phitti Creek during southwest monsoon

A waverider buoy was deployed in Phitti Creek (24°33'N; 67°03'E) for wave measurements during April-July 1986. Using Tucker's method wave records were calculated in terms of significant wave height (Hs) and Maximum Wave Height (Hmax). For each parameter weekly mean and standard deviation values were also computed for statistical analysis. For Hs the lowest mean value of 0.8m and for Hmax the lowest mean value of 1.51m were observed in the fourth week of April whereas the highest mean value observed for Hs was 3.02m and for Hmax was 4.94m in the fourth week of June, 1986

Variation of significant wave periods during southwest monsoon in Phitti Creek, northern Arabian Sea, Pakistan

To study the wave characteristics a Waverider buoy was deployed in Phitti Creek of northern Arabian Sea at 24º 33′ N and 67º 03′ E for wave measurements during south-west monsoon (April-July) 1985 and 1986. Wave records in terms of significant wave period (Tz) were collected using Tucker’s method. Percentage frequency distribution, standard deviation (σ), mean (μ), highest significant wave period (HTz) and lowest significant wave period (LTz) values were computed for statistical analysis. For the year 1985 Tz were ranged between 5.05 s to 12.03 s; the lowest μ value of 5.05 s (with a σ 0.50 s, HTz 5.85 s and LTz 4.35 s) was observed in the 3rd week of May and the highest μ 12.03 s (with a σ of 3.45 s, HTz 15.38 s and LTz 8.96 s) was observed in the first week of August. In the year 1986 Tz were ranged between 6.65 s to 10.70 s; the lowest μ value of 6.65 s (with a σ 1.12 s, HTz 10.00 s and LTz 6.00 s) was observed in the 3rd week of April and the highest μ 10.70 s (with a σ of 1.78 s, HTz 14.28 s and LTz 7.89 s) was observed in the 3rd week of June