Student Research Reports
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Study of water and soil factors affecting crab density in Khlong Plak Ben, Hat Samran, Trang
Organization(s):Wichienmatu
Country:Thailand
Student(s):Miss Jatuporn Imjit
Miss Apinya Singin
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Educator(s):Jiraporn Sirirat
Contributors:
Report Type(s):International Virtual Science Symposium Report
Protocols:Biometry (including Tree Height), Soil Characterization, Soil Fertility, Soil Moisture - Gravimetric, Soil Temperature
Presentation Poster:
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Language(s):English
Date Submitted:03/05/2025
This research aimed to study the environmental factors (salinity and temperature of the
seawater at the surface) that affected the density of crabs in Khlong Plak Ben, Ban Khok Ok,
Tambon Hat Samran, Amphoe Hat Samran, Trang Province. Samples were collected to analyze
the relationship between environmental factors and the density of crabs. The results showed
that the crabs had the lowest density of 24 crabs per square meter, while the crabs had the
highest density of 32 crabs per square meter. The area with the highest density of crabs was
found to have soil with an average pH value of 7.67 indicating high soil fertility. The soil in this
area had a low salinity level, averaging 4.91 ppt, which was significantly different from the area
with lower crab density. The average water temperature was 27.5±0.5°C, the dissolved oxygen
level was 6.75±0.25 mg/L, the pH was 6.25±0.25, the salinity was 23.76±2.4 ppt, and the
hardness was 137.5±7.5 mg/L. These conditions were in the optimum range for crab survival.
It was found that changes in soil salinity significantly affected the crab density in the study area.
Keywords: Soil quality, Water quality, Mangroves