Crabs appeared in tidal flat of Okinohata, Yanagawa, Fukuoka prefecture [Japan] and some ecological findings of Xenophthalmus pinnotheroides
2005
Aramaki, Y.(National Fisheries Univ., Shimonoseki, Yamaguchi (Japan)) | Taguchi, K. | Hishiki, K. | Suda, Y. | Murai, T.
In order to investigate effects of changes in the bottom conditions for small crabs inhabit on tidal flat, the mud samples were collected monthly from sandy and muddy tidal flats nearby in the northern part of Ariake Sound from June 2002 to October 2003. The crabs in the mud samples were sorted and identified. There was a clear difference in the preference for habitat, that is, the dominant crab in sandy bottom was Pinnixia rathbuni while that in muddy bottom was Xenophthalmus pinnotheroides. However, X. pinnotheroides also drastically decreased in number during summer season when mud content and AVS-S apparently increased in 2003. Rearing experiments in a small aquarium revealed that X. pinnotheroides could endure drastic change in the environmental condition and live for long period even after releasing the metazoea. These results suggest that changes in the bottom conditions around the survey area in 2003 may have shown some adverse effects even on X, pinnothervides.
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