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Effect of population density on burrow characteristics in the fiddler crab (Uca bengali)

Student(s):Miss Siorn Leekpai Mr. Chatcharin Jandee
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Teacher:Patchara Pongmanawut
Contributors:Assoc.Prof.Krisanadej Jaroensutasinee Assoc.Prof.Mullica Jaroensutasinee Walailak University Dr.Anantanit Chumsri Rajamangala University of Technology Srivijaya Mrs.Patchara Pongmanawut Miss Neungruthai Chaimanee Princess Chulabhorn Science High School, Trang
Report Type(s):International Virtual Science Symposium Report
Protocols:Soil Characterization, Soil Moisture - Gravimetric, Soil pH
Presentation Video: View Video
Optional Badges:Be a Collaborator, Make An Impact, Be a STEM Professional
Date Submitted:03/10/2021
Fiddler Crab
This study was conducted at Mangrove Extension, HadModtanoi Kantang, Trang Province, Southern Thailand. A muddy area covering a 2 different area of high density and low density of fiddler crab. We used 50 X 50 cm2 quadrats (n=5) to measure the density, sex ratio, body and claw sizes, burrow length and diameters. We collected sediment samples (100 g each) from each quadrat to analyse the percentage of sediment moisture content,organic matter and pH. Results showed that population density was 92.80 ± 8.67 individuals/m2 with a sex ratio of male per female as 2:1. The density of the fiddler crab in low density is 17.60 ± 4.56 individuals/m2 and the sex ratio is 7:4. Crab body size in the high density is larger than in low density. In both area we find the crab burrow in 2 shape as I and J. The ratio between I per J in high density is 12 :39 (male 6 :22, female 6 :17) and in low density is 8:14 (male 5 :10, female 3 :4) The study of burrow length and diameter found that the length of burrow in high density is longer than in the low density except the length of the female, J burrow as in low density is longer than high density. The soil texture in high density is sand loam and in low density is loamy sand. The organic matter in high density is higher than in low density. The sediment moisture and pH in high density is lower than in low density.