Sex Ratio and Carapace Length-Width Relationship of Pilumnid Crab, Heteropanope glabra Stimpson, 1858 (Brachyura: Pilumnidae)
Abstract
Some aspects on biology of pilumnid crabs, Heteropanope glabra Stimpson, 1858 were studied. Crabs were collected from mangrove area near the paved road along the seashore bridge, Muang district, Chonburi province. Specimen of crabs were collected for two months from April to May 2016. The total number of collected crabs were 444 crabs, with 217 males and 227 females. Female crabs were divided into two groups, without egg and with eggs. There were 95 females without egg and 132 females with eggs. The sex ratio between male and female crabs was 1.05: 1.00. The carapace width in most of the male crabs were in the range of 12-22 mm, whereas in female and ovigerous female crabs were in the range of 12-17 mm. The maximum and minimum carapace width of male crabs was 25.28 and 8.29 mm respectively, with the average of 16.28 ± 2.60 mm. The maximum and minimum carapace width of female crabs without egg were 18.18 and 10.97 mm respectively, with the average of 14.25 ± 1.59 mm. The maximum and minimum carapace width of female with eggs were 18.98 and 9.72 mm, respectively with the average of 14.05 ± 1.67. There was no difference between average size of female without eggs and females with eggs. The carapace width of the smallest size of female crab with eggs was 9.72 mm. The equation of the relationship between carapace width and carapace length of crabs in both sexes was CL = 0.6469CW + 0.7309 Keywords : sex ratio, carapace width, carapace length, Pilumnid crab, Heteropanope glabra 309References
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Dai, A. and Yang S. (1991) Crabs of the China Seas. China Ocean Press, Beijing and Springer-Verlag, Berlin Heidelberg New York Tokyo, English edition, 682 pp.
Lee, S. Y. (1998) Ecological role of grapsid crabs in mangrove ecosystems: a review Mar. Freshwater Res., 49,335–343.
Mohktari, M., Savari, A., Rezai, H., Kochanian, P. and Bitaab, A. (2008). Population ecology of fiddler crab, Uca lactea annulipes (Decapoda,Ocypodidae) in Sirik mangrove estuary, Iran. Estuarine and Coastal Shelf Sciences, 76(2), 273-281.
Mookui, P., Paphavasit, N. and Sudtongkong, C. (2012). Reproductive Biology of Fiddler Crab Uca perplexa (H. Milne Edwards, 1837) in Klong Sikao Mangrove Forest, Trang Province. Research Journal of Rajamangala University of Technology Srivijaya, 4(2), 10-22. (in Thai).
Ng, P.K.L., Daniele, G. and Davia, P.J.F. (2008). Systema brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world, The Ruffles Bulletin of Zoology, 17, 1-286.
Pahuratana, K. (1983). Study on behaviour and ecology of two fiddler crabs, Uca (Deltuca) forcipata (Adams and White, 1848) and Uca (Deltuca) dussumieri spinata (H. Milne-Edwards, 1852). Master of Science Thesis, Kasetsart University, 134 pp (in Thai).
Pailahan, S. (2006). Species diversity of Xanthid crabs along the East Coast of Thailand. Senier Project, Department of Biology, Faculty of science, Burapha University, Chonburi. 56 pp. (in Thai).
Tangkrock-olan, N. (2014). Shrimps, Mantis shrimps and Crabs along the marine ecosystem in the Marine Plant Genetic Conservation Area, Mo Ko Samaesarn, Chonburi province. Final Report, 51 pp. (in Thai).
Wisespongpand, P., Thamrongnawasawat, T., Chankong, A. and Srichomngam, W. (2013). Preliminary study of life history and toxicity of red egg crab (Atergatis integerrimus) at coastal habitat of Mu Koh Mun, Rayong province.. Proceedings of the 51st Kasetsart University Annual Conference, Bangkok, Thailand, 5-7 February 2013, p. 365-372. (in Thai)
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2018-01-05
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