Abundant and rare picoeukaryotic sub‐communities present contrasting patterns in the epipelagic waters of marginal seas in the northwestern Pacific Ocean

Abstract

In this work, they compared patterns of abundant and rare picoeukaryotic sub-communities in the epipelagic waters (surface and 40-75 m depth subsurface layers) of the East and South China Seas across seasons via 454 pyrosequencing of the V4 region of 18S rDNA. They also examined the relative effects of environmental filtering, dispersal limitations and seasonality on community assembly. Their results indicated that (i) in the surface layer, abundant taxa are primarily influenced by dispersal limitations and rare taxa are primarily influenced by environmental filtering, whereas (ii) in the subsurface layer, both abundant and rare sub-communities are only weakly influenced by environmental filtering but are strongly influenced by dispersal limitations. Moreover, (iii) abundant taxa exhibit stronger temporal variability than rare taxa. They also found that abundant and rare sub-communities display similar spatial richness patterns that are negatively correlated with latitude and chlorophyll a and positively correlated with temperature. In summary, environmental filtering and dispersal limitations have different effects on abundant and rare picoeukaryotic sub-communities in different layers. Thus, depth appears as an essential variable that governs the structuring patterns of picoeukaryotic communities in the oceans and should be thoroughly considered to develop a more comprehensive understanding of oceanic microbial assemblages.

Geographic Patterns of Bacterioplankton among Lakes of the Middle and Lower Reaches of the Yangtze River Basin, China

“…For example, Mo et al (27) revealed that rare taxa have a stronger response to dispersal limitations than abundant bacterioplankton subcommunities in subtropical bays of China. The different result also reported by Wu et al (28), who found that abundant taxa had greater dispersal limitations in the surface layer of northwestern Pacific Ocean. (2) Abundant and rare taxa carry out different ecological strategies, may have different ecological niches, and are likely to have different responses to environmental changes.…”

Soil pH and temperature regulate assembly processes of abundant and rare bacterial communities in agricultural ecosystems

“…In our study, dispersal significantly influenced the abundant sub‐community but not the rare sub‐community. This result is supported by a study showing that abundant taxa were more limited by dispersal than rare taxa in the surface layer of the north‐western Pacific Ocean (Wu et al ., ). Other studies have shown that rare taxa are more limited by dispersal than abundant taxa in oil‐contaminated soils (Jiao et al ., ) and subtropical bays (Mo et al ., ).…”

“…These low-abundance taxa are often referred to as the 'rare biosphere' (Sogin et al, 2006;Pedrós-Alió, 2012). The highly abundant microbes that account for the majority of microbial biomass are thought to be most important in carbon cycling (Pedrós-Alió, 2012;Wu et al, 2017). In oil-contaminated soils, abundant taxa had closer relationships with and a greater influence on the co-occurrence of other taxa than rare taxa did (Jiao et al, 2017a).…”

“…Over the last decade, highthroughput sequencing technologies have allowed researchers to explore microbial community assembly in the rare biosphere (Logares et al, 2012). Indeed, studies have been conducted in a wide range of environments, such as marine water (Logares et al, 2014;Wu et al, 2017;Mo et al, 2018), inland freshwater (Liu et al, 2015) and oil-contaminated soil (Jiao et al, 2017a). In oilcontaminated soil, the rare subcommunity is primarily governed by stochastic processes; meanwhile, deterministic processes are the primary contributor to the structure of the abundant sub-community (Jiao et al, 2017a).…”

Metatranscriptome analysis reveals environmental and diel regulation of a Heterosigma akashiwo (raphidophyceae) bloom

“…To minimize the chance that gene expression profiles change during sample collection, all samples were filtered immediately after they came on dock; filtration was completed within 15 min; and the filter immersed in TRIzol was immediately stored at 2208C on the ship until transport to laboratory where the samples were stored at 2808C. In addition, the sub-samples for analyzing Chl a and nutrients including phosphate, nitrate 1 nitrite, ammonia and silicate were collected and measured as previously described (Huang et al, 2010;Wu et al, 2017).…”