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Effects of nutrient loading on sediment bacterial and pathogen communities within seagrass meadows

Version 2 2024-06-18, 07:30
Version 1 2018-03-15, 07:54
journal contribution
posted on 2024-06-18, 07:30 authored by S Liu, Z Jiang, Y Deng, Y Wu, J Zhang, C Zhao, D Huang, X Huang, Stacey Trevathan-TackettStacey Trevathan-Tackett
Eutrophication can play a significant role in seagrass decline and habitat loss. Microorganisms in seagrass sediments are essential to many important ecosystem processes, including nutrient cycling and seagrass ecosystem health. However, current knowledge of the bacterial communities, both beneficial and detrimental, within seagrass meadows in response to nutrient loading is limited. We studied the response of sediment bacterial and pathogen communities to nutrient enrichment on a tropical seagrass meadow in Xincun Bay, South China Sea. The bacterial taxonomic groups across all sites were dominated by the Gammaproteobacteria and Firmicutes. Sites nearest to the nutrient source and with the highest NH4+and PO43-content had approximately double the relative abundance of putative denitrifiers Vibrionales, Alteromonadales, and Pseudomonadales. Additionally, the relative abundance of potential pathogen groups, especially Vibrio spp. and Pseudoalteromonas spp., was approximately 2-fold greater at the sites with the highest nutrient loads compared to sites further from the source. These results suggest that proximity to sources of nutrient pollution increases the occurrence of potential bacterial pathogens that could affect fishes, invertebrates and humans. This study shows that nutrient enrichment does elicit shifts in bacterial community diversity and likely their function in local biogeochemical cycling and as a potential source of infectious diseases within seagrass meadows.

History

Journal

MicrobiologyOpen

Volume

7

Article number

ARTN e600

Pagination

1 - 11

Location

England

ISSN

2045-8827

eISSN

2045-8827

Language

English

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2018, The Authors.

Issue

5

Publisher

WILEY