Abstract:
:Montmorillonitic clay influences the biological control ofEscherichia coli in aquatic systems, the magnitude of the effects being dependent on the state of the clay and the type of host-antagonist interaction. The interaction ofBdellovibrio andE. coli was partially inhibited by the presence of montmorillonite. Because it is highly motile,Bdellovibrio apparently could penetrate any colloidal clay barrier aroundE. coli if the clay envelope was thin enough. Colloidal clay had little effect on predation ofE. coli by the myxobacteriumPolyangium, and had no effect on the activity of the amoebaVexillifera. Crude clay, on the other hand, resulted in a physical separation of predator and prey, and this completely inhibited theE. coli-Polyangium interaction and slowed the rate of engulfment ofE. coli byVexillifera.The interference of natural biological control by clays may alter the microbial balance favoring survival of fecal microorganisms and resulting in their accumulation in saline sediments. This could constitute a health hazard if these organisms were released by upwelling of bottom waters or were desorbed in estuarine systems by dilution during heavy rains.
journal_name
Microb Ecoljournal_title
Microbial ecologyauthors
Roper MM,Marshall KCdoi
10.1007/BF02013272subject
Has Abstractpub_date
1977-12-01 00:00:00pages
279-89issue
4eissn
0095-3628issn
1432-184Xjournal_volume
4pub_type
杂志文章abstract::Fungi play an important role in cycling organic matter and nutrients in marine ecosystems. However, the distribution of fungal communities in the ocean, especially the vertical distribution along depth in the water column, remained poorly understood. Here, we assess the depth-related distribution pattern of fungal com...
journal_title:Microbial ecology
pub_type: 杂志文章
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