Cargando…

The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model

Bivalves process large volumes of water, leading to their accumulation of bacteria, including potential human pathogens (e.g., vibrios). These bacteria are captured at low efficiencies when freely suspended in the water column, but they also attach to marine aggregates, which are captured with near...

Descripción completa

Detalles Bibliográficos
Autores principales: Kramer, Andrew M., Ward, J. Evan, Dobbs, Fred C., Pierce, Melissa L., Drake, John M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5513250/
https://www.ncbi.nlm.nih.gov/pubmed/28725407
http://dx.doi.org/10.1002/ece3.2467
_version_ 1783250622690099200
author Kramer, Andrew M.
Ward, J. Evan
Dobbs, Fred C.
Pierce, Melissa L.
Drake, John M.
author_facet Kramer, Andrew M.
Ward, J. Evan
Dobbs, Fred C.
Pierce, Melissa L.
Drake, John M.
author_sort Kramer, Andrew M.
collection PubMed
description Bivalves process large volumes of water, leading to their accumulation of bacteria, including potential human pathogens (e.g., vibrios). These bacteria are captured at low efficiencies when freely suspended in the water column, but they also attach to marine aggregates, which are captured with near 100% efficiency. For this reason, and because they are often enriched with heterotrophic bacteria, marine aggregates have been hypothesized to function as important transporters of bacteria into bivalves. The relative contribution of aggregates and unattached bacteria to the accumulation of these cells, however, is unknown. We developed an agent‐based model to simulate accumulation of vibrio‐type bacteria in oysters. Simulations were conducted over a realistic range of concentrations of bacteria and aggregates and incorporated the dependence of pseudofeces production on particulate matter. The model shows that the contribution of aggregate‐attached bacteria depends strongly on the unattached bacteria, which form the colonization pool for aggregates and are directly captured by the simulated oysters. The concentration of aggregates is also important, but its effect depends on the concentration of unattached bacteria. At high bacterial concentrations, aggregates contribute the majority of bacteria in the oysters. At low concentrations of unattached bacteria, aggregates have a neutral or even a slightly negative effect on bacterial accumulation. These results provide the first evidence suggesting that the concentration of aggregates could influence uptake of pathogenic bacteria in bivalves and show that the tendency of a bacterial species to remain attached to aggregates is a key factor for understanding species‐specific accumulation.
format Online
Article
Text
id pubmed-5513250
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-55132502017-07-19 The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model Kramer, Andrew M. Ward, J. Evan Dobbs, Fred C. Pierce, Melissa L. Drake, John M. Ecol Evol Original Research Bivalves process large volumes of water, leading to their accumulation of bacteria, including potential human pathogens (e.g., vibrios). These bacteria are captured at low efficiencies when freely suspended in the water column, but they also attach to marine aggregates, which are captured with near 100% efficiency. For this reason, and because they are often enriched with heterotrophic bacteria, marine aggregates have been hypothesized to function as important transporters of bacteria into bivalves. The relative contribution of aggregates and unattached bacteria to the accumulation of these cells, however, is unknown. We developed an agent‐based model to simulate accumulation of vibrio‐type bacteria in oysters. Simulations were conducted over a realistic range of concentrations of bacteria and aggregates and incorporated the dependence of pseudofeces production on particulate matter. The model shows that the contribution of aggregate‐attached bacteria depends strongly on the unattached bacteria, which form the colonization pool for aggregates and are directly captured by the simulated oysters. The concentration of aggregates is also important, but its effect depends on the concentration of unattached bacteria. At high bacterial concentrations, aggregates contribute the majority of bacteria in the oysters. At low concentrations of unattached bacteria, aggregates have a neutral or even a slightly negative effect on bacterial accumulation. These results provide the first evidence suggesting that the concentration of aggregates could influence uptake of pathogenic bacteria in bivalves and show that the tendency of a bacterial species to remain attached to aggregates is a key factor for understanding species‐specific accumulation. John Wiley and Sons Inc. 2016-09-24 /pmc/articles/PMC5513250/ /pubmed/28725407 http://dx.doi.org/10.1002/ece3.2467 Text en © 2016 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Kramer, Andrew M.
Ward, J. Evan
Dobbs, Fred C.
Pierce, Melissa L.
Drake, John M.
The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title_full The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title_fullStr The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title_full_unstemmed The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title_short The contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
title_sort contribution of marine aggregate‐associated bacteria to the accumulation of pathogenic bacteria in oysters: an agent‐based model
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5513250/
https://www.ncbi.nlm.nih.gov/pubmed/28725407
http://dx.doi.org/10.1002/ece3.2467
work_keys_str_mv AT kramerandrewm thecontributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT wardjevan thecontributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT dobbsfredc thecontributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT piercemelissal thecontributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT drakejohnm thecontributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT kramerandrewm contributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT wardjevan contributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT dobbsfredc contributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT piercemelissal contributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel
AT drakejohnm contributionofmarineaggregateassociatedbacteriatotheaccumulationofpathogenicbacteriainoystersanagentbasedmodel