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Microbiology

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Microbial Ecology

Microbes in Streams, Lakes, and Rivers

Description

Freshwater microbes live in streams, rivers, lakes, ponds, and marshes, but their communities change with water movement, light, depth, and nutrients. These systems are often grouped into lotic waters, which flow, and lentic waters, which are still or slow-moving. The physical setting shapes where microbes grow and how they ...

Transcript

淡水微生物生态学受到有机碳、营养物质、氧气和光照的可利用性的影响。

在靠近水面处,浮游植物利用阳光将二氧化碳转化为有机碳。

在浅水区域,硅藻有助于有机碳的生成,而异养微生物则分解这些有机碳,释放二氧化碳并将养分重新循环回水体中。

淹没表面的生物膜可截留水中的有机物,细菌、真菌和原生生物协同作用,将其分解并释放二氧化碳。

底栖区域通常从落叶和水下有机物中获得碳,这些碳被异养微生物降解。

这些微生物将溶解性有机碳重新释放到水中,支持邻近的微生物群落。

城市和农业径流可将有机废物带入淡水中,导致水体富营养化。

这会促进蓝藻在水体表面形成水华,并在异养微生物分解过量生物量的过程中导致后续的氧气耗尽,从而影响微生...

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