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Spatial and temporal variability of aerobic anoxygenic photoheterotrophic bacteria along the east coast of Australia

journal contribution
posted on 2023-05-19, 07:09 authored by Bibiloni-Isaksson, J, Seymour, JR, Ingleton, T, van de Kamp, JL, Bodrossy, L, Brown, MV
Aerobic Anoxygenic Phototrophic Bacteria (AAnPB) are ecologically important microorganisms, widespread in oceanic photic zones. However, the key environmental drivers underpinning AAnPB abundance and diversity are still largely undefined. The temporal patterns in AAnPB dynamics at three oceanographic reference stations spanning at approximately 15° latitude along the Australian east coast were examined. AAnPB abundance was highly variable, with pufM gene copies ranging from 1.1 × 102 to 1.4 × 105 ml−1 and positively correlated with day length and solar radiation. pufM gene Miseq sequencing revealed that the majority of sequences were closely related to those obtained previously, suggesting that key AAnPB groups are widely distributed across similar environments globally. Temperature was a major structuring factor for AAnPB assemblages across large spatial scales, correlating positively with richness and Gammaproteobacteria (phylogroup K) abundance but negatively with Roseobacter-clade (phylogroup E) abundance, with temperatures between 16°C and 18°C identified as a potential transition zone between these groups. Network analysis revealed that discrete AAnPB populations exploit specific niches defined by varying temperature, light and nutrient conditions in the Tasman Sea system, with evidence for both niche sharing and partitioning amongst closely related operational taxonomic units.

History

Publication title

Environmental Microbiology

Volume

18

Issue

12

Pagination

4485-4500

ISSN

1462-2912

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

Copyright 2016 Society for Applied Microbiology and John Wiley & Sons Ltd

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of terrestrial ecosystems

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