Iron oxides act as an alternative electron acceptor for aerobic methanotrophs in anoxic lake sediments.

Conventional aerobic CH-oxidizing bacteria (MOB) are frequently detected in anoxic environments, but their survival strategy and ecological contribution are still enigmatic. Here we explore the role of MOB in enrichment cultures under O gradients and an iron-rich lake sediment in situ by combining microbiological and geochemical techniques. We found that enriched MOB consortium used ferric oxides as alternative electron acceptors for oxidizing CH with the help of riboflavin when O was unavailable.

Small-Sized Microplastics Negatively Affect Rotifers: Changes in the Key Life-History Traits and Rotifer- Population Dynamics.

Most coastal waters are at risk from microplastics, which vary in concentration and size. Rotifers, as important primary consumers linking primary producers and higher trophic consumers, usually coexist with the harmful alga and microplastics in coastal waters; this coexistence may interfere with rotifer life-history traits and ingestion of . To evaluate the effects of microplastics on rotifers, we designed a series of experiments concerning rotifer life-history traits and rotifer- (predator-prey) population dynamics under different concentrations and sizes of microplastics.