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首页> 外文期刊>Marine biology >Microbial reaction rates and bacterial communities in sediment surrounding burrows of two nereidid polychaetes (Nereis diversicolor and N. virens)
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Microbial reaction rates and bacterial communities in sediment surrounding burrows of two nereidid polychaetes (Nereis diversicolor and N. virens)

机译：两种Nereidid多毛cha（Nereis diversicolor和N. virens）的洞穴周围的沉积物中的微生物反应速率和细菌群落

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摘要

The effects of infaunal mode of life on sediment properties, microbial reaction rates, as well as abundance and composition of bacterial communities were studied in sediment surrounding burrows (mucus lining, oxidised wall, ambient anoxic and surface sediment) of two closely related, but behaviourally different, nereidid polychaete worms: the facultative suspension-feeder Nereis (Hediste) diversicolor and the obligate deposit-feeder Nereis (Neanthes) virens. Burrow sediment of the two species was collected from two adjacent (50 m distance) shallow sandy locations (Kertinge Nor, Denmark). The burrow lining and wall of both polychaete species were enriched in organic matter originating from mucous secretions by the inhabitants and phytoplankton trapped through irrigation. This was more evident for N. diversicolor that shows a significantly higher irrigation rate than N. virens. Both the organic matter mineralisation rates (based on anaerobic incubations) and bacterial abundance were higher along the burrow linings and walls. However, accumulation of porewater TCO_2 and dissolved organic carbon in sediments adjacent to burrows increased most rapidly in the presence of N. diversicolor, suggesting higher heterotrophic activity associated with this species. Surprisingly, bacterial abundance was lower around burrows of N. diversicolor than those from N. virens indicating that burrow environments from the first species harbour a more active bacterial community. Molecular fingerprints of the 16S rRNA gene from bacterial communities showed that the composition of the burrow linings and walls resembled the ambient anoxic sediment rather than the oxic sediment surface. On the other hand, the bacterial fingerprints of the sediment surrounding the burrows of the two polychaete species were markedly different suggesting either a site-specific difference in sediment parameters or a significant species-specific impact of the burrow inhabitants.
机译：在两种紧密相关但行为方式相似的洞穴周围的沉积物（黏液衬里，氧化壁，环境缺氧和表面沉积物）中研究了无生命生活模式对沉积物特性，微生物反应速率以及细菌群落的丰度和组成的影响。不同的nereidid多毛cha蠕虫：兼性悬浮喂食器Nereis（Hediste）杂色和专性沉积喂食器Nereis（Neanthes）病毒。这两个物种的洞穴沉积物是从两个相邻的（50 m距离）浅沙地（Kertinge Nor，丹麦）收集的。两种多毛动物的洞穴内壁和壁都富含居民的粘液分泌的有机物和通过灌溉捕获的浮游植物。这对于杂色猪笼草（N. diversicolor）而言，其灌溉速度明显高于维尔京猪笼草。沿洞穴壁和壁的有机质矿化率（基于厌氧培养）和细菌丰度均较高。然而，在存在杂色猪笼草的情况下，邻近洞穴的沉积物中孔隙水TCO_2和溶解有机碳的积累增长最快，这表明该物种具有更高的异养活性。出人意料的是，杂色猪笼草周围的细菌丰度要比维尔京猪笼草的细菌丰富度低，这表明第一个物种的洞穴环境中细菌的活跃性更高。来自细菌群落的16S rRNA基因的分子指纹显示，洞穴内壁和壁的组成类似于环境缺氧沉积物，而不是含氧沉积物表面。另一方面，两种多毛类物种的洞穴周围的沉积物的细菌指纹显着不同，表明沉积物参数的特定地点差异或洞穴居民的显着物种特定影响。

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