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Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca./
Author:	Wong, Tai Choi Richard.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2005,
Description:	401 p.
Notes:	Source: Dissertations Abstracts International, Volume: 68-04, Section: B.
Contained By:	Dissertations Abstracts International68-04B.
Subject:	Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3203214
ISBN:	9780542515736

Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca.
Wong, Tai Choi Richard.

Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca. - Ann Arbor : ProQuest Dissertations & Theses, 2005 - 401 p.

Source: Dissertations Abstracts International, Volume: 68-04, Section: B.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2005.

This item must not be sold to any third party vendors.

This thesis research involves biomonitoring levels of eight metal species (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in seaweed and the effects of these metals on the reproduction of Ulva lactuca. The study started from September 1999 and ended in June 2001, covering 40 intertidal sites in Hong Kong and 24 seaweed species. Environmental data on pH, salinity and nutrient levels (ammonia, nitrite, nitrate and phosphate) in seawater from these sites were also monitored. The metal abundance in 24 seaweeds showed the following trend: Fe > Mn, Zn > Cu, Ni, Pb, Cr > Cd. U. lactuca and Padina australis showed relatively high mean and large range values of metal levels. Principal component analysis summarized the overall metal loadings in these 24 seaweed species. The variations in Pb, Fe, Mn and Cr levels in the seaweeds varied greatly. There were significant spatial variations of different metal levels in the extensive study of U. lactuca from various intertidal waters in Hong Kong from 1999 to 2001. In general, metal levels in U. lactuca increased from January to March or April and then dropped in the following months. No periodic patterns or temporal trends of variations of metal levels in U. lactuca were found. Different metal levels in U. lactuca were comparatively lower than those in other studies in other countries and in past studies in Hong Kong. No periodic patterns of temporal variations in the metal levels in U. lactuca or in other seven common seaweed species from Ping Chau were observed from 1999 to 2000. Cu levels were generally negatively correlated with other metals in seaweeds. Spore production of U. lactuca was significantly reduced by the elevation of copper and nickel levels in the seaweed samples. The reproductive frequency of U. lactuca generally increased from January and February to the maxima in March and April. Copper, nickel and nitrate levels showed significant negative correlations with these reproductive frequencies. There were significantly differences in various metal levels in different structures of Sargassum hemiphyllum, generally decreased in the following order: receptacles > vesicles > leaves > branches.

ISBN: 9780542515736Subjects--Topical Terms:

535383
Oceanography.
Subjects--Index Terms:

Heavy metals

Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca.
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245 1 0 $a Spatial and temporal distributions of heavy metals in Hong Kong seaweeds with an analysis on the effect of heavy metals on the reproduction of the green alga Ulva lactuca.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2005
300 $a 401 p.
500 $a Source: Dissertations Abstracts International, Volume: 68-04, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Cheung, P. C. K.;Ang, P. O., Jr.
502 $a Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2005.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a This thesis research involves biomonitoring levels of eight metal species (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in seaweed and the effects of these metals on the reproduction of Ulva lactuca. The study started from September 1999 and ended in June 2001, covering 40 intertidal sites in Hong Kong and 24 seaweed species. Environmental data on pH, salinity and nutrient levels (ammonia, nitrite, nitrate and phosphate) in seawater from these sites were also monitored. The metal abundance in 24 seaweeds showed the following trend: Fe > Mn, Zn > Cu, Ni, Pb, Cr > Cd. U. lactuca and Padina australis showed relatively high mean and large range values of metal levels. Principal component analysis summarized the overall metal loadings in these 24 seaweed species. The variations in Pb, Fe, Mn and Cr levels in the seaweeds varied greatly. There were significant spatial variations of different metal levels in the extensive study of U. lactuca from various intertidal waters in Hong Kong from 1999 to 2001. In general, metal levels in U. lactuca increased from January to March or April and then dropped in the following months. No periodic patterns or temporal trends of variations of metal levels in U. lactuca were found. Different metal levels in U. lactuca were comparatively lower than those in other studies in other countries and in past studies in Hong Kong. No periodic patterns of temporal variations in the metal levels in U. lactuca or in other seven common seaweed species from Ping Chau were observed from 1999 to 2000. Cu levels were generally negatively correlated with other metals in seaweeds. Spore production of U. lactuca was significantly reduced by the elevation of copper and nickel levels in the seaweed samples. The reproductive frequency of U. lactuca generally increased from January and February to the maxima in March and April. Copper, nickel and nitrate levels showed significant negative correlations with these reproductive frequencies. There were significantly differences in various metal levels in different structures of Sargassum hemiphyllum, generally decreased in the following order: receptacles > vesicles > leaves > branches.
590 $a School code: 1307.
650 4 $a Oceanography. $3 535383
650 4 $a Environmental science. $3 677245
650 4 $a Botany. $3 516217
653 $a Heavy metals
653 $a Hong Kong
653 $a Reproduction
653 $a Seaweeds
653 $a Ulva lactuca
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710 2 $a The Chinese University of Hong Kong (Hong Kong). $3 1017547
773 0 $t Dissertations Abstracts International $g 68-04B.
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791 $a Ph.D.
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3203214