BACTERIAL BIOFILMS AS A TROPHIC RESOURCE FOR CERTAIN BENTHIC FORAMINIFERA
BACTERIAL BIOFILMS AS A TROPHIC RESOURCE FOR CERTAIN BENTHIC FORAMINIFERA
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DOI：
10.3354/meps083263
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发表时间：
1992-07-01
影响因子：
2.5
通讯作者：
BOWSER, SS
中科院分区：
文献类型：
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作者：
BERNHARD, JM;BOWSER, SS
从温带潮滩和浅南极沃茨的底栖有孔虫的细菌生物膜的挑战，以评估可能的有孔虫附着细菌种群的影响。2种覆被植物（Allogromia sp.和A. laticollaris）使用伪足网络来撕裂和摄取生物膜包裹，我们称之为收获的活动。收获的生物膜区域中的细菌数密度对于异格孢属物种最大消耗约80%，对于A.阔颈肌与此相反，石灰质（Cyclogyra ananacutica，Elphidium incertum，Glandulina anacutica，Pyrgo wilgosoni）和凝集（Astrammina rara，Astrorhiza sp.，研究的Crithionina样泥球）有孔虫没有表现出收获行为。延时显微镜显示，生物膜包裹细胞外运输到细胞体伪足，观察进一步定义伪足有孔虫营养机制的功能。我们的观察表明，allogromiid有孔虫可能发挥以前未被认识到的作用，在细菌种群动态和营养循环，特别是在潮间带环境和某些深海栖息地，他们可能构成一个主要的小型底栖动物的组成部分。
Benthic foraminifera from temperate tidal flats and shallow Antarctic waters were challenged with bacterial biofilms to assess possible foraminiferal impact on attached bacterial populations. Two tectinous species (Allogromia sp. and A. laticollaris) used pseudopodial networks to rend and ingest biofilm parcels, an activity we term harvesting. The numerical density of bacteria in harvested biofilm areas was maximally depleted by ca 80 % for Allogromia sp. and 50 % for A. laticollaris. In contrast, the calcareous (Cyclogyra antarctica, Elphidium incertum, Glandulina antarctica, Pyrgo williamsoni) and agglutinated (Astrammina rara, Astrorhiza sp., Crithionina-like mudball) foraminifera studied did not exhibit harvesting behavior. Time-lapse microscopy revealed that biofilm parcels were transported extracellularly toward the cell body by pseudopodia, an observation which further defines pseudopodial function in foraminiferal trophic mechanisms. Our observations indicate that allogromiid foraminifera may play a previously unrecognized role in bacterial population dynamics and nutrient cycling, particularly in intertidal environments and certain deep-sea habitats where they may constitute a major meiofaunal component.