Cyanobacterial biofilm Raw sequence reads. Cyanobacterial biofilms

In rivers and freshwater lakes, filamentous cyanobacteria mostly belonging to the Leptolyngbyaceae family bore limestone surfaces as deep as 300 to 500 micrometer by dissolving carbonate at the tip of their 3 to 8 micrometer-thick filaments. The density of burrows decreases downward but at the rock surface it is so high that micrometric debris forms. This disintegrated material on surface of the pebbles can be easily removed, for instance, when pebbles are grinding against each other due wave or current action. Moreover, larvae of insects like flies may remove the loosened material during grazing activity and constructing their cases. After the larvae cases became abandoned, they decay with time and the newly available surfaces become colonized by boring cyanobacteria again. These processes may alternate repeatedly and thus, the surface gets a sculptured/carved appearance, in particular as insect larvae tend to colonize already existing depressions again while being better protected there against predation. The dataset contains raw read sequences of 16S rRNA gene amplicons of epilithic and endolithic, boring cyanobacteria and their associated microbiome.

在河流与淡水湖泊中，多数隶属于细鞘丝藻科（Leptolyngbyaceae）的丝状蓝细菌（filamentous cyanobacteria）可通过自身3~8微米厚的丝状体尖端溶解碳酸盐，在石灰岩表面钻孔至300~500微米的深度。钻孔的密度随深度增加而逐渐降低，但在岩石表面密度极高，进而形成微米级碎屑。卵石表面的这类崩解碎屑极易被移除，例如在波浪或水流作用下卵石相互摩擦时，碎屑便会脱落。此外，蝇类等昆虫幼虫在觅食活动与构筑虫套的过程中，也可清除这些松动的碎屑。当幼虫遗弃虫套后，虫套会随时间逐渐腐解，新暴露的岩石表面便会再次被钻孔蓝细菌定植。上述过程可反复循环，最终使岩石表面呈现出雕琢/刻蚀的形貌；尤为特殊的是，昆虫幼虫更倾向于在已有的凹陷处定植，因为此处能更好地躲避天敌捕食。本数据集包含表生（epilithic）及内生（endolithic）钻孔蓝细菌及其相关微生物组（microbiome）的16S rRNA基因扩增子（16S rRNA gene amplicons）原始读段序列。