Spatially resolved assembly, connectivity and structure of particle-associated and free-living bacterial communities in a high Arctic fjord

The assembly processes that underlie the composition and connectivity of free-living (FL) and particle-associated (PA) bacterial communities from surface to deep waters remain little understood. Here, using phylogenetic null modeling, we quantify the relative influence of selective and stochastic me...

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Bibliographic Details
Published in:FEMS Microbiology Ecology
Main Authors: Jain, Anand, Balmonte, John Paul, Singh, Richa, Bhaskar, Parli Venkateswaran, Krishnan, Kottekkatu Padinchati
Format: Article in Journal/Newspaper
Language:English
Published: 2021
Subjects:
bacterial communities
community assembly
free-living
high Arctic
Kongsfjorden
particle-associated
Arctic
Kongsfjord*
Online Access:https://portal.findresearcher.sdu.dk/da/publications/0f66bdb3-2db1-4c52-be62-8003afea9479
https://doi.org/10.1093/femsec/fiab139
https://findresearcher.sdu.dk/ws/files/194917241/fiab139.pdf
Description
Summary:The assembly processes that underlie the composition and connectivity of free-living (FL) and particle-associated (PA) bacterial communities from surface to deep waters remain little understood. Here, using phylogenetic null modeling, we quantify the relative influence of selective and stochastic mechanisms that assemble FL and PA bacterial communities throughout the water column in a high Arctic fjord. We demonstrate that assembly processes acting on FL and PA bacterial communities are similar in surface waters, but become increasingly distinct in deep waters. As depth increases, the relative influence of homogeneous selection increases for FL but decreases for PA communities. In addition, dispersal limitation and variable selection increase with depth for PA, but not for FL communities, indicating increased residence time of taxa on particles and less frequent decolonization. As a consequence, beta diversity of PA communities is greater in bottom than in surface waters. The limited connectivity between these communities with increasing depth leads to highly distinct FL and PA bacterial communities in bottom waters. Finally, depth-related trends for FL and PA beta diversity and connectivity in this study are consistent with previous observations in the open ocean, suggesting that assembly processes for FL and PA bacterial communities may also be distinct in other aquatic environments.

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