2 7 JUil 2003

RELATⅡONSHIP BETWEEN COLONIZAT10N OF

BENTHIC MACROINVERTEBRATES ON ARTIFICIAL

SUBSTRATES AND WATER QUALITY

IN THE CHAO PⅡRAYA RIVER

KITTIKAND TANRATTANAWONG―~

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THESIS SUBMITTED IN PARTIAL FULFILLMENT

OF TⅡE REQUIREMENTS FOR

THE DEGREE OF lⅦASTER OF SCIENCE

(ENVIRONMENTAL SANITATIODFACULTY OF GRADUATE STUDIES

mHIDOL UNIVERSITY

2003

1SBN 974‐ 04‐3058‐9

COPYRIGHT OF MAHIDOL UNIVERSITY

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Copyright by Mahidol University

Fac.ofGrad.Smdies,Mahidbl Univ. Thesis / iv

BETWEEN COLON:ZAT10N OF BENTHIC MACRONVERTEBRATES ON ARTIFICIAL SUBSTRAWATER QUALITY nヾ TIIE CHAO PHRAYA RIVER

TANRATrANAWONG 4336134 PⅢ欧MM

(ENVIRONMEblrAL SANITATI∞

ADVISORS:SurHEP SILAPANUltrrAKULPh D mED&VET EhJrOMoLOCり VAJIRA SNGHAKAJEN,MAWVARN SIMACHAYへ Ph D(ENV ENo

ABSTRACr

The main objeaive of 0re study was to determine the artificial substrate preference for

macroinvertebrate colonization and its relationship with the water quality in the Chao

from January to July 2002. Benthics were collected in baskeb separately filled with

ceramic, foam, PVC and stone. The colonized benthics were collected monthly

identified. The pH, temperature, velocity, fansparency, turbidity, dissolved oxygen @O),

oxygen demand (BOD), nitrate, total phosphorus (TP), depth and salinity were collected weekly

determined. Data analysis was caried out by using the Spearman's rank Correlation.

Most water quality samples met the class 3 of the water quality standard except for DO,

nitrate in some months. The level of salinity was not observed firoughout this study. Three phyla

macroinvertebrates: Annelid4 Arthropoda and Mollusca comprised 8 classes, l8 orden, and 39

The to● I nttber ofindividuals ofbenthic macro抽 ertebrates was 43,716 individuals/m〕.The

density and taxa richness of benthic macroinvertebrates were both found in the 4d month (April

May) and the lowest density and taxa richness were both found in the l"' month (January-February).

highest and lowest density and taxa richness were 8,300, 5551 ind/m2 and 26, 17 respectively. The

divers,indeX Of benthL macrOinvertebrates was 146 in the 6・ month cune‐Jul,and

was 0.91 in the l" month. PVC strowed th€ highest efficient substrate in terms of density

(29,5214 ind/m) and stone showed the highest efficient substrate in terms of taxa

and divenity index (1.39). Gammaridae was a dominant familn with a density of 14,885

and followed by 10,064 ind/m203.020/Op of Hymenosomidae.Both of them were

on PVC

From the statistical analysis,山 e detennination of the signincant relationship between

and water quality found that Gammaridae had a positive corelation with turbidity

0.432,pく 0001)DO← =0387,pく 0 0ol),and dCpth← =0・486,pく 0 0ol)and a

with temperature (r = -0.438, p < 0.001), and TP (r = -0.492, p < 0.001). Arcidae had

COrFClation wih BOD← =0.566,pく 0.001)and TP← =0.683,pく 0001)and a

wn,.bid"← =Ю.522,pく 0001),DO← =Ю.501,pく 0.001),and depth← =‐0594,p

1).Cammaridae could probably be sed to indicae thc good water quality of the Chao

Arcidae could probabty be used to indicate the poor water quality of the Chao Phraya River.

Resuhs suggest that PVC was the most suitable substsate to use for collecting the

in the Chao Phraya River.

WORDS:鐵胤 騰 器 X慰 躙 Ⅷ Ⅷ W器 は

‐ W BENTHC

117 P ISBN 974-04_3058‐9

Copyright by Mahidol University

Fac.ofGrad.Studics,Mahido:Univ Thesis / v

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SUBSTRATE ANDWATER QUALITY ttN CHAO PHRAYA RIVER)

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6ulriin::qnrYura'lludruo'rrurururiu (29,544 drnrNrun:) f,uirl:cf, inrrqtrJnlufll:t6ud?odN1u

druirlrruruauacRlruflalfl artt (29 ua! 1.39 nudldu) nrirrdudnurrnfiqa 6o Gammaridae iRrrr

l4,EE5 eirnlrl{lun 1 (34.05 %t rora{!160 Hymenosomidae fin:uulrlrriu 10p64 drnrrQ3.avo)

nrrira:rcliarruYliiuinrsair'iiiu-othdqd::dl cc = o.os nl'jr :ri Gammaridae

(r = 0.432, p < 0.001), ooRirrun:nro (r = 0.38?, p < 0.001) un:nruiin (r = 0.486,

0.001) rra:iarrliluriuf,nmalriuqorqfi (r = -0.438, p < 0.$l) uocllsrfi{oifl:,tr (1 = -0.492, p

l) 2{f Arcidae ifl2rutluriuf,tr.ru:nririilo6 (r = 0.s56, p < 0.001) ua:r{ocr{ointi! (r = 0.6E3, p

0.001) uaaiarruiYuriuf,nrrauriuarruriu (r = -0.522, p < 0.ool), oonArun:nro (r = -0.501, p < 0.001)

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Copyright by Mahidol University