Mud shrimp burrows as dynamic traps and processors of tidal-flat materials
Mud shrimp burrows as dynamic traps and processors of tidal-flat materials
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DOI：
10.3354/meps247159
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发表时间：
2003-01-01
影响因子：
2.5
通讯作者：
Furota, T
中科院分区：
文献类型：
--
作者：
Kinoshita, K;Wada, M;Furota, T
测定了泥虾（Upogebia major）洞壁上的细菌丰度、电子传递系统活性（ETSA）和有机质含量（总有机碳[TOC]、总氮[TN]和chl a），并与周围非洞穴沉积物和潮滩表面进行了比较。各参数在穴居沉积物中呈向外递减的趋势，而细菌丰度在穴居沉积物的近地表处最高。在夏季，洞穴壁上的细菌丰度是非洞穴沉积物的两倍。在冬季，细菌丰度和ETSA均与非穴居沉积物处于相同水平。无论季节如何，洞壁TOC和TN含量均比非洞壁沉积物高3倍以上。而洞壁与非洞壁沉积物chl - a含量差异不显著。这些结果表明，洞穴壁上的新鲜有机质来自潮坪表面，使洞穴环境成为沉积物中微生物种群的适宜生态位。泥虾洞的功能是捕获有机物，因此有助于防止碳和氮从潮滩流出。
Bacterial abundance, electron transport system activity (ETSA) and organic matter content (total organic carbon [TOC], total nitrogen [TN] and chl a) on the burrow wall of the mud shrimp Upogebia major were determined and compared with those in surrounding non-burrow sediments and on the tidal-flat surface. The values of each parameter in burrow sediment tended to decrease outwardly from the wall, while bacteria abundance was highest in the subsurface of the burrow wall. In summer, the abundance of bacteria on the burrow wall was double that in the non-burrow sediments. In winter, both bacterial abundance and ETSA were at the same level as those in non-burrow sediments. The levels of TOC and TN on the burrow wall were more than 3 times higher than those in non-burrow sediments, regardless of the season. However, there was no significant difference in chl a content between burrow wall and non-burrow sediments. These results suggest that fresh organic matter in the burrow wall is supplied from the tidal-flat surface, making the burrow environment a suitable niche for microbial populations in the sediment. The mud shrimp burrow functions as a trap for organic matter and thus, helps prevent the outflow of carbon and nitrogen from the tidal flat.