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Bacterioplankton Responses to Increased Organic Carbon and Nutrient Loading in a Boreal Estuary—Separate and Interactive Effects on Growth and Respiration

Soares, Ana R.A. LU ; Kritzberg, Emma S. LU ; Custelcean, Ioana and Berggren, Martin LU (2017) In Microbial Ecology
Abstract

Increases in the terrestrial export of dissolved organic carbon (C) to rivers may be associated with additional loading of organic nitrogen (N) and phosphorus (P) to the coastal zone. However, little is known about how these resources interact in the regulation of heterotrophic bacterioplankton metabolism in boreal coastal ecosystems. Here, we measured changes in bacterioplankton production (BP) and respiration (BR) in response to full-factorial (C, N, and P) enrichment experiments at two sites within the Öre estuary, northern Sweden. The BR was stimulated by single C additions and further enhanced by combined additions of C and other nutrients. Single addition of N or P had no effect on BR rates. In contrast, BP was primarily limited... (More)

Increases in the terrestrial export of dissolved organic carbon (C) to rivers may be associated with additional loading of organic nitrogen (N) and phosphorus (P) to the coastal zone. However, little is known about how these resources interact in the regulation of heterotrophic bacterioplankton metabolism in boreal coastal ecosystems. Here, we measured changes in bacterioplankton production (BP) and respiration (BR) in response to full-factorial (C, N, and P) enrichment experiments at two sites within the Öre estuary, northern Sweden. The BR was stimulated by single C additions and further enhanced by combined additions of C and other nutrients. Single addition of N or P had no effect on BR rates. In contrast, BP was primarily limited by P at the site close to the river mouth and did not respond to C or N additions. However, at the site further away from the near the river mouth, BP was slightly stimulated by single additions of C. Possibly, the natural inflow of riverine bioavailable dissolved organic carbon induced local P limitation of BP near the river mouth, which was then exhausted and resulted in C-limited BP further away from the river mouth. We observed positive interactions between all elements on all responses except for BP at the site close to the river mouth, where P showed an independent effect. In light of predicted increases in terrestrial P and C deliveries, we expect future increases in BP and increases of BR of terrestrially delivered C substrates at the Öre estuary and similar areas.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Bacterial metabolism, Bacterial production, Bacterial respiration, Nutrient interactions, Nutrient limitation, Terrestrial dissolved organic matter
in
Microbial Ecology
pages
12 pages
publisher
Springer
external identifiers
  • scopus:85038351884
ISSN
0095-3628
DOI
10.1007/s00248-017-1115-7
language
English
LU publication?
yes
id
80ddef49-b5d3-4758-841e-40cb9a35a2c4
date added to LUP
2018-01-03 10:45:19
date last changed
2018-01-04 03:00:08
@article{80ddef49-b5d3-4758-841e-40cb9a35a2c4,
  abstract     = {<p>Increases in the terrestrial export of dissolved organic carbon (C) to rivers may be associated with additional loading of organic nitrogen (N) and phosphorus (P) to the coastal zone. However, little is known about how these resources interact in the regulation of heterotrophic bacterioplankton metabolism in boreal coastal ecosystems. Here, we measured changes in bacterioplankton production (BP) and respiration (BR) in response to full-factorial (C, N, and P) enrichment experiments at two sites within the Öre estuary, northern Sweden. The BR was stimulated by single C additions and further enhanced by combined additions of C and other nutrients. Single addition of N or P had no effect on BR rates. In contrast, BP was primarily limited by P at the site close to the river mouth and did not respond to C or N additions. However, at the site further away from the near the river mouth, BP was slightly stimulated by single additions of C. Possibly, the natural inflow of riverine bioavailable dissolved organic carbon induced local P limitation of BP near the river mouth, which was then exhausted and resulted in C-limited BP further away from the river mouth. We observed positive interactions between all elements on all responses except for BP at the site close to the river mouth, where P showed an independent effect. In light of predicted increases in terrestrial P and C deliveries, we expect future increases in BP and increases of BR of terrestrially delivered C substrates at the Öre estuary and similar areas.</p>},
  author       = {Soares, Ana R.A. and Kritzberg, Emma S. and Custelcean, Ioana and Berggren, Martin},
  issn         = {0095-3628},
  keyword      = {Bacterial metabolism,Bacterial production,Bacterial respiration,Nutrient interactions,Nutrient limitation,Terrestrial dissolved organic matter},
  language     = {eng},
  month        = {12},
  pages        = {12},
  publisher    = {Springer},
  series       = {Microbial Ecology},
  title        = {Bacterioplankton Responses to Increased Organic Carbon and Nutrient Loading in a Boreal Estuary—Separate and Interactive Effects on Growth and Respiration},
  url          = {http://dx.doi.org/10.1007/s00248-017-1115-7},
  year         = {2017},
}