Burrow Morphological Characteristics of Episesarma mederi (H. Milne Edwards, 1853) (Decapoda, Grapsidae, Sesarminae)

Authors

  • Somsak Buatip Faculty of Science and Technology, Prince of Songkla University, Pattani Campus. 181 Chroenpradit Road. T.Rusamilae, Mueng, Pattani Province 94000
  • Pimonrat Thongroy
  • Pun Yeesin

Abstract

Burrow morphological characteristics of the mangrove crabs, Episesarma mederi (H. Milne Edwards, 1853), in Prince of Songkla University, Pattani campus mangrove forest was studied. Average density of burrow was 9.32±4.21 burrows per square meter. Burrows of these crabs were not found in mudflat zone. Burrow opening was classified as 2 types. The first type of the burrow opening was liked a cup or cone shape, with 2-18 cm in diameter. Diameter of burrow surface is large following the burrow size. The surface of the most burrows was no more than 20 cm. The thickness of the burrow surface was ranged from 0-15 cm. The most burrow sizes were 5-10 cm. The second type was liked a molehill, the burrows in this nature can be subdivided into 2 types, single and multiple molehill types. The height of single molehill type was 20-53 cm and the burrow opening diameters were ranged from 4-12 cm. The radius burrow openings were 4-17 cm and the diameters of the width of hill base were 26-97 cm. While the diameter of the multiple molehill type was 60-213 cm with the highest at 75 cm. The radius of the burrow opening was up to 32 cm. There were 3-4 hill top and some of the molehill type showed 40 burrows. Moreover, these crabs were found to create 5 different structural burrow forms, those were I-shape, L-shape,               S-shape, Y-shape, and ฯ-shape, which the depth of the burrows was ranged between 15-156 cm with 30o-90o                           is inclination angle, and the most burrows presented 1-5 chamber.Keywords :  burrow, sesarmid, mangrove forest, Pattani

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Published

2017-05-09