Microbial activity and accumulation of organic matter in the burrow of the mud shrimp, <Emphasis Type="Italic">Upogebia major</Emphasis> (Crustacea: Thalassinidea) |
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Authors: | K Kinoshita M Wada K Kogure T Furota |
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Affiliation: | (1) Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100, Tsukide, Kumamoto 862-8502, Japan;(2) Ocean Research Institute, The University of Tokyo, Minamidai 1-15-1, Nakano, Tokyo 164-8639, Japan;(3) Department of Environmental Science, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan |
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Abstract: | Microbial activity and accumulation of organic matter in the burrow of the thalassinidean mud shrimp, Upogebia major, were studied on a tidal flat along the northern coast of Tokyo Bay, Japan. The burrow of U. major is Y-shaped with an upper U-shaped part plus a lower I-shaped part. Its lower part can extend to a depth of 2 m. In the present
study, we compare electron transport system activity (ETSA), bacterial abundance and organic matter content total organic
carbon (TOC), total nitrogen (TN) and chlorophyll a (chl. a)] of the burrow wall sediment with the tidal flat surface and non-burrow sediments. We also compared the U- and I-shaped
part in terms of these parameters. ETSA in the burrow wall was higher than at the tidal flat surface in the warmer season,
and was always higher than at surrounding non-burrow sediments. Bacterial abundance in the burrow wall was higher than at
the tidal flat surface and surrounding sediment. TOC and TN contents in the burrow wall were two to three times higher than
those at the tidal flat surface and non-burrow sediments, regardless of season. However, there was no significant difference
in chl. a content between burrow wall and tidal flat surface. These results suggest that organic enrichment of the burrow wall is a
result of organic matter particles such as phytodebris accumulation along the burrow wall. For all parameters of the burrow
walls, no statistical differences were found between the two parts. Present results indicate that U. major actively transports the water containing suspended organic particles not only through the U-part but also into the deeper
I-part. These indicate that burrow of the mud shrimp provides a dynamic environment for microbial community in tidal flat
sediment. |
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