Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder

ABSTRACT One approach to improve forecasts of how global change will affect ecosystem processes is to better understand how anthropogenic disturbances alter bacterial assemblages that drive biogeochemical cycles. Species invasions are important contributors to global change, but their impacts on bac...

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Autores principales:	Vincent J. Denef, Hunter J. Carrick, Joann Cavaletto, Edna Chiang, Thomas H. Johengen, Henry A. Vanderploeg
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2017
Materias:	16S rRNA gene invasive species disturbance freshwater ecology microbial ecology quagga mussel Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/1be8762f322f43dab1ab384313a277c8
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spelling	oai:doaj.org-article:1be8762f322f43dab1ab384313a277c82021-11-15T15:21:47ZLake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder10.1128/mSphere.00189-172379-5042https://doaj.org/article/1be8762f322f43dab1ab384313a277c82017-06-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphere.00189-17https://doaj.org/toc/2379-5042ABSTRACT One approach to improve forecasts of how global change will affect ecosystem processes is to better understand how anthropogenic disturbances alter bacterial assemblages that drive biogeochemical cycles. Species invasions are important contributors to global change, but their impacts on bacterial community ecology are rarely investigated. Here, we studied direct impacts of invasive dreissenid mussels (IDMs), one of many invasive filter feeders, on freshwater lake bacterioplankton. We demonstrated that direct effects of IDMs reduced bacterial abundance and altered assemblage composition by preferentially removing larger and particle-associated bacteria. While this increased the relative abundances of many free-living bacterial taxa, some were susceptible to filter feeding, in line with efficient removal of phytoplankton cells of <2 μm. This selective removal of particle-associated and larger bacteria by IDMs altered inferred bacterial functional group representation, defined by carbon and energy source utilization. Specifically, we inferred an increased relative abundance of chemoorganoheterotrophs predicted to be capable of rhodopsin-dependent energy generation. In contrast to the few previous studies that have focused on the longer-term combined direct and indirect effects of IDMs on bacterioplankton, our study showed that IDMs act directly as a biological disturbance to which freshwater bacterial assemblages are sensitive. The negative impacts on particle-associated bacteria, which have been shown to be more active than free-living bacteria, and the inferred shifts in functional group representation raise the possibility that IDMs may directly alter bacterially mediated ecosystem functions. IMPORTANCE Freshwater bacteria play fundamental roles in global elemental cycling and are an intrinsic part of local food webs. Human activities are altering freshwater environments, and much has been learned regarding the sensitivity of bacterial assemblages to a variety of these disturbances. Yet, relatively few studies have focused on how species invasion, which is one of the most important aspects of anthropogenic global change, affects freshwater bacterial assemblages. This study focuses on the impact of invasive dreissenid mussels (IDMs), a globally distributed group of invasive species with large impacts on freshwater phyto- and zooplankton assemblages. We show that IDMs have direct effects on lake bacterioplankton abundance, taxonomic composition, and inferred bacterial functional group representation.Vincent J. DenefHunter J. CarrickJoann CavalettoEdna ChiangThomas H. JohengenHenry A. VanderploegAmerican Society for Microbiologyarticle16S rRNA geneinvasive speciesdisturbancefreshwater ecologymicrobial ecologyquagga musselMicrobiologyQR1-502ENmSphere, Vol 2, Iss 3 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	16S rRNA gene invasive species disturbance freshwater ecology microbial ecology quagga mussel Microbiology QR1-502
spellingShingle	16S rRNA gene invasive species disturbance freshwater ecology microbial ecology quagga mussel Microbiology QR1-502 Vincent J. Denef Hunter J. Carrick Joann Cavaletto Edna Chiang Thomas H. Johengen Henry A. Vanderploeg Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
description	ABSTRACT One approach to improve forecasts of how global change will affect ecosystem processes is to better understand how anthropogenic disturbances alter bacterial assemblages that drive biogeochemical cycles. Species invasions are important contributors to global change, but their impacts on bacterial community ecology are rarely investigated. Here, we studied direct impacts of invasive dreissenid mussels (IDMs), one of many invasive filter feeders, on freshwater lake bacterioplankton. We demonstrated that direct effects of IDMs reduced bacterial abundance and altered assemblage composition by preferentially removing larger and particle-associated bacteria. While this increased the relative abundances of many free-living bacterial taxa, some were susceptible to filter feeding, in line with efficient removal of phytoplankton cells of <2 μm. This selective removal of particle-associated and larger bacteria by IDMs altered inferred bacterial functional group representation, defined by carbon and energy source utilization. Specifically, we inferred an increased relative abundance of chemoorganoheterotrophs predicted to be capable of rhodopsin-dependent energy generation. In contrast to the few previous studies that have focused on the longer-term combined direct and indirect effects of IDMs on bacterioplankton, our study showed that IDMs act directly as a biological disturbance to which freshwater bacterial assemblages are sensitive. The negative impacts on particle-associated bacteria, which have been shown to be more active than free-living bacteria, and the inferred shifts in functional group representation raise the possibility that IDMs may directly alter bacterially mediated ecosystem functions. IMPORTANCE Freshwater bacteria play fundamental roles in global elemental cycling and are an intrinsic part of local food webs. Human activities are altering freshwater environments, and much has been learned regarding the sensitivity of bacterial assemblages to a variety of these disturbances. Yet, relatively few studies have focused on how species invasion, which is one of the most important aspects of anthropogenic global change, affects freshwater bacterial assemblages. This study focuses on the impact of invasive dreissenid mussels (IDMs), a globally distributed group of invasive species with large impacts on freshwater phyto- and zooplankton assemblages. We show that IDMs have direct effects on lake bacterioplankton abundance, taxonomic composition, and inferred bacterial functional group representation.
format	article
author	Vincent J. Denef Hunter J. Carrick Joann Cavaletto Edna Chiang Thomas H. Johengen Henry A. Vanderploeg
author_facet	Vincent J. Denef Hunter J. Carrick Joann Cavaletto Edna Chiang Thomas H. Johengen Henry A. Vanderploeg
author_sort	Vincent J. Denef
title	Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
title_short	Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
title_full	Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
title_fullStr	Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
title_full_unstemmed	Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder
title_sort	lake bacterial assemblage composition is sensitive to biological disturbance caused by an invasive filter feeder
publisher	American Society for Microbiology
publishDate	2017
url	https://doaj.org/article/1be8762f322f43dab1ab384313a277c8
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_version_	1718428115023167488

Lake Bacterial Assemblage Composition Is Sensitive to Biological Disturbance Caused by an Invasive Filter Feeder

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