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首页> 外文期刊>American malacological bulletin >A stable isotope tracer (delta C-13) study of Escherichia coli retention in two freshwater bivalves (Corbicula fluminea and Elliptio complanata) (Corbiculidae and Unionidae)
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A stable isotope tracer (delta C-13) study of Escherichia coli retention in two freshwater bivalves (Corbicula fluminea and Elliptio complanata) (Corbiculidae and Unionidae)

机译：一项稳定的同位素示踪剂（δC-13）研究了大肠杆菌在两个淡水双壳类动物中的残留情况（Corbicula fluminea和Elliptio complanata）（Corbiculidae和Unionidae）

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摘要

Bacteria are ingested by suspension feeding bivalves and can be an important component of their diet. This study evaluated whether a common bacterium of vertebrate enteric origin, Escherichia coli (Migula, 1895), is retained in the stomach or gill by two different freshwater bivalve species, Corbicula fluminea (Muller, 1974) and Elliptio complanata (Lightfoot, 1786). A series of diet treatment experiments were conducted comparing each anatomical section using a delta C-13 label and E. coli cells grown from stock cultures. A significant difference in delta C-13 values was related to anatomic structure among all treatment groups during a 7-day feeding experiment (24 jars, df = 140; F = 4.88; P < 0.001). A key finding was that in gill tissue, a significant difference was observed among delta C-13-labeled and unlabeled treatment combinations for both C. fluminea and E. complanata (F = 13.57; df = 31; P < 0.0001). The results suggest that water column E. coli are likely retained on gill tissue and to a lesser degree in the stomach in both E. complanata and C. fluminea. This study serves to validate the hypothesis that E. coli may be initially more abundant in gill tissue during sorting processes before being transferred to the stomach.
机译：悬浮饲料喂食双壳类动物可摄取细菌，细菌可能是其饮食中的重要组成部分。这项研究评估了两种不同的淡水双壳类变种——Corbicula fluminea（Muller，1974）和Elliptio complanata（Lightfoot，1786）是否将脊椎动物肠道起源的常见细菌大肠埃希氏菌（Migula，1895）保留在胃或g中。进行了一系列饮食治疗实验，比较了使用delta C-13标记和从原种培养物中生长的大肠杆菌细胞对每个解剖切片的影响。在为期7天的喂养实验中，所有治疗组之间的C-13值差异显着（24罐，df = 140; F = 4.88; P <0.001）。一个关键发现是，在tissue组织中，对于C. fluminea和E. complanata而言，在δC-13标记和未标记的治疗组合之间观察到了显着差异（F = 13.57; df = 31; P <0.0001）。结果表明，水柱大肠杆菌很可能保留在tissue组织中，而在沙棘肠杆菌和C. fluminea中则保留在胃中的程度较小。这项研究证实了以下假设：在分选过程中，大肠杆菌可能最初在g组织中更为丰富，然后才转移到胃中。

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