trace metal contents in the porites corals of peninsularmalaysia
نویسندگان
چکیده
the concentration contents of ca, mg, sr and zn in porites corals from pulau langkawi, pulau redang and pulau tioman were presented. the corals were cleaned and the growth rate examined visually. the growth rate of porites in malaysia waters was between 5 to 25 mm yr-1 and each band was selected for determining the metal contents using the atomic absorption spectrophotometer (aas). the mean values of ca (42.1 %), mg (1184 î¼g/g), sr (6276 î¼g/g) and zn (60.6 î¼g/g) were calculated from each annual skeleton band representing the yearly growth. porites coral from pulau langkawi shows a high content of zn (118 î¼g/g) representing the water surrounding the island was highly polluted and also shows the uptake of sr and ca in the coral skeleton was related to the content of zn, where sr and ca contents decreases when the concentration of zn was more than 50 î¼g/g. terrestrial runoff from sumatera and west coast of peninsular malaysia are presumed to be the cause of pollution in malacca straits.
منابع مشابه
the trace of translators ideology in literary translations: a case study of persian translation of the scaret letter
رساله ی حاضر تلاشی است برای بررسی مبحث ایدئولوژی در ترجمه ادبی و تاثیرات آن بر کار مترجم، اعم از گزینش واژگان و ساختارهای دستوری؛ با تمرکز بر تحلیل انتقادی گفتمان در متن مبدأ و متن مقصد، که در این رساله متن مبدأ رمان داغ ننگ اثر ناتانیل هاوثورن و ترجمه فارسی سیمین دانشور به عنوان متن مقصد مورد بررسی قرار گرفته است. تجزیه و تحلیل رمان های مورد نظر به طور عمده بر اساس مدل پیشنهادی فرحزاد(2007) بر...
Heavy metal pollution recorded in Porites corals from Daya Bay, northern South China Sea.
We examined metal-to-calcium ratios (Fe/Ca, Mn/Ca and Zn/Ca) in the growth bands of two Porites corals from Daya Bay, South China Sea, in order to trace long-term trends in local ambient pollution levels. Although Fe and Mn did not show any obvious increasing trends over 32 years in the period 1976-2007, peak values of Fe/Ca and Mn/Ca occurred in the mid-late 1980s, temporally-coeval with the l...
متن کاملImpact of skeletal dissolution and secondary aragonite on trace element and isotopic climate proxies in Porites corals
[1] Restricted zones of recent dissolution and secondary aragonite infilling were identified in a coral core collected in 1986 from a living massive Porites colony from the central Great Barrier Reef, Australia. Secondary aragonite needles, 20 mm long, cover skeletal surfaces deposited from 1972 to late 1974 and increase bulk density by 10%. Dissolution is observed above this zone, whereas olde...
متن کاملLight microclimate of endolithic phototrophs in the scleractinian corals Montipora monasteriata and Porites cylindrica
The light microclimate of phototrophic endoliths growing within the scleractinian corals Porites cylindrica and Montipora monasteriata was described by scalar irradiance microprobe measurements within different layers of the coral skeleton. Characterisation of the pigments in individual layers was done by reflectance spectroscopy with fibre-optic radiance microprobes. The spectral measurements ...
متن کاملthe effect of the record infancy in crimilly acts of guilties (in karaj city)
چکیده یکی از مهمترین دغدغه های بزرگ جوامع بشری، از دیر باز تا کنون که ذهن پژوهشگران و متخصصان بهداشت روانی و اجتماعی و دولتها رابه خود مشغول داشته، مسأله ی بزهکاری می باشد. شناخت کامل پدیده ی بزهکاری و بزهکار، علل وعوامل سقوط یک انسان، چگونگی درمان وی و درنهایت پیشگیری ازبزهکاری ودریک کلام سالم سازی یک جامعه، رسالت عظیم، انسانی ومقدسی می باشد که با بررسی شخصیت مجرم یعنی[ انسانی که تحت شرای...
15 صفحه اولWater ̄ow and prey capture by three scleractinian corals, Madracis mirabilis, Montastrea cavernosa and Porites porites, in a ®eld enclosure
Scleractinian corals experience a wide range of ̄ow regimes which, coupled with colony morphology, can aect the ability of corals to capture zooplankton and other particulate materials. We used a ®eld enclosure oriented parallel to prevailing oscillatory ̄ow on the forereef at Discovery Bay, Jamaica, to investigate rates of zooplankton capture by corals of varying morphology and polyp size unde...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
international journal of environmental researchناشر: university of tehran
ISSN 1735-6865
دوره 3
شماره 1 2009
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023