Status and habitat preferences for endemic inhabitants of fiddler crab Uca formosensis in Hsiang-Shan wetland, Taiwan
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This article reports on soil samples collected from Hsiang-Shan wetland, Taiwan. Canonical discriminant analysis (CDA) was applied to identify an existing habitat type’s scheme by identifying the physico-chemical properties of sediment in Hsiang-Shan wetland. The three constructed discriminant functions (CDFs) showed a marked contribution by most of the discriminant variables, and the recognition capacities in these three CDFs were 49.5, 32.8 and 17.7%. Our study revealed that the most important latent factors in Hsiang-Shan wetland are soil texture-caused factor, ocean current-caused factor, nutrient-caused factor, and the redox reaction-caused factor. And the most sensitivity parameters in this habitat followed the descending order: OBD, EC, Eh, sand, TN, porosity, STP, silt, VCP and pH. And the inhabited sediment properties for U. formosensis in terms of soil texture are sand, silt, and clay (34.05, 29.72, and 32.35%, respectively): that is clay loam soil. We also found that U. formosensis preferred to inhabit the upper intertidal zone, spending 8.41% of the time submerged. Vegetation coverage on the ground was less than 2.20%, showing that it preferred to live in a bare intertidal habitat. Concerning nest choosing, excavating burrows is more difficult when a high soil penetration force is required, and in this study the soil penetration force for 20 cm was found to be is 45.98 N/cm2. The results will be helpful in developing a methodology for use by the government in refining its management programs.
KeywordsCanonical discriminant analysis Sediment properties Taiwan Uca formosensis
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- ASTM (1994). Particle size analysis of soils, D-422. Annual book of ASTM standards (vol. 4.08). Philadelphia: American Society for Testing and Materials.Google Scholar
- Brower, J. E., Zar, J. H., & Von Ende, C. N. (1998). Field and laboratory methods for general ecology (4th ed). New York: McGraw-Hill.Google Scholar
- Cruz-Castillo, J. G., Ganeshanandam, S., Mackay, B. R., Lawes, G. S., & Woolley, D. J. (1994). Application of canonical discriminant analysis in horticultural research. HortScience, 29, 1115–1119.Google Scholar
- Hillel, D. (1998). Environmental soil physics. New York: Academic.Google Scholar
- Hsieh, H. L., Chen, C. P., & Lin, P. P. (2004). The impact of mangroves on wetlands biodiversity: Uca formosensis. Wetlands Hope, 47, 21–33 (in Chinese).Google Scholar
- Huberty, C. J. (1994). Applied discriminant analysis. New York: Wiley.Google Scholar
- Liao, S. W., Gau, H. S., Lai, W. L., Chen, J. J., & Lee, C. G. (2007). Identification of pollution of Tapeng Lagoon from neighbouring rivers using multivariate statistical method. Journal of Environmental Management, DOI 10.1016/j.jenvman.2007.02.010.
- Macnae, W. (1968). A general account of the flora and fauna of the mangrove swamps in the Indo-West-Pacific region. Advances in Marine Biology, 63, 73–270.Google Scholar
- Matthew, C., Lawoko, C. R. O., Korte, C. J., & Smith, D. (1994). Application of canonical discriminant analysis, principal component analysis, and canonical correlation analysis as tools for evaluation differences in pasture botanical composition. New Zealand Journal of Agricultural Research, 37, 509–520.CrossRefGoogle Scholar
- Shih, H. T., Mok, H. K., & Chang, H. W. (2005). Chimney building by male Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae) after pairing: A new hypothesis for chimney function. Zoological Studies, 44(2), 242–251.Google Scholar
- Shih, H. T., Mok, H. K., Chang, H. W., & Lee, S. C. (1999). Morphology of Uca formosensis Rathbun, 1921 (Crustacea: Decapoda: Ocypodidae), an endemic fiddler crab from Taiwan, with notes on its ecology. Zoological Studies, 38(2), 164–177.Google Scholar
- Smith, W. K., & Miller, P. C. (1973). The thermal ecology of two South Florida fiddler crabs: Uca rapax Smith and Uca pugilator Bosc. Physiological Zoology, 46, 186–207.Google Scholar
- StatSoft (2004). STATISTICA for Windows, StatSoft, Inc, Tulsa OK.Google Scholar
- Takahasi, S. (1934a). An ecological study of the littoral animals near the mouth of Tamsui. Transport. Native History Society Formosa, 24, 1–14 (in Japanese).Google Scholar
- Takahasi, S. (1934b). The ecology of Ocypodidae near the mouth of Tamsui. Zoological Magazine, 45, 73–74 (in Japanese).Google Scholar
- Takahasi, S. (1935). Ecological notes on the ocypodian crabs (Ocypodidae) in Formosa, Japan. Annales Zoologici in Japan, 15, 78–87.Google Scholar