Bacterial growth control in marine environments : from experimental approaches to comparative analyses
To understand (1) the role of heterotrophic bacteria in the biogeochemical cycles, (2) the fate of the organic carbon and mineral nutrients, and (3) the flow of energy to higher trophic levels, we need to understand how bacterial growth is controlled in marine environments. The main hypotheses about...
Published in: | Polar Biology |
---|---|
Main Author: | |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
The University of Bergen
2010
|
Subjects: | |
Online Access: | https://hdl.handle.net/1956/4472 |
id |
ftunivbergen:oai:bora.uib.no:1956/4472 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Biochemistry: 476 |
spellingShingle |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Biochemistry: 476 Cuevas, Luis Antonio Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
topic_facet |
VDP::Mathematics and natural science: 400::Basic biosciences: 470::Biochemistry: 476 |
description |
To understand (1) the role of heterotrophic bacteria in the biogeochemical cycles, (2) the fate of the organic carbon and mineral nutrients, and (3) the flow of energy to higher trophic levels, we need to understand how bacterial growth is controlled in marine environments. The main hypotheses about the control of bacterial growth are based on the studies about bottomup control (limiting resources) and top-down control (predators and viruses), that is, how bacteria interact with their ‘neighbors’ in the microbial food web. Using micro- and mesocosm experiments, comparative analyses, plus an idealized model to test different predictions, this thesis evaluates the role of heterotrophic bacteria in the utilization of organic matter in different marine environments. The effects of mineral nutrients, organic carbon and predator control over bacterial growth are also investigated. Bacterial growth rates can be controlled by carbon or/and mineral nutrients depending on the biological oceanographic conditions (Papers I and II). Both types of bacterial growth limitation (carbon and mineral nutrient) can co-exist simultaneously depending on the structure of the microbial food web, mineral nutrient and labile organic carbon concentration. Dominance of nano-phytoplankton, which can be grazed by rapidly responding micro-zooplankton (e.g. idealized model in Paper IV), will shifts more rapidly to a carbon limited bacterial growth, thus, heterotrophic bacteria may use all labile organic carbon preventing its accumulation in the euphotic zone (Paper I). Contrary, dominance of large diatoms, which can be grazed by slowly responding copepods, can keep labile organic carbon produced by copepod (e.g. sloppy feeding) and bacterial growth can be limited by mineral nutrients (i.e. competition of nutrients with diatoms) (Paper II) shifting the system slowly to carbon limited bacterial growth control. Different rates of organic carbon utilization by bacteria can be estimated in manipulated mesocosm experiments by adding mineral nutrients ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Cuevas, Luis Antonio |
author_facet |
Cuevas, Luis Antonio |
author_sort |
Cuevas, Luis Antonio |
title |
Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
title_short |
Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
title_full |
Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
title_fullStr |
Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
title_full_unstemmed |
Bacterial growth control in marine environments : from experimental approaches to comparative analyses |
title_sort |
bacterial growth control in marine environments : from experimental approaches to comparative analyses |
publisher |
The University of Bergen |
publishDate |
2010 |
url |
https://hdl.handle.net/1956/4472 |
genre |
Arctic Polar Biology Copepods |
genre_facet |
Arctic Polar Biology Copepods |
op_relation |
Paper I: Polar Biology, Cuevas, L. A.; Egge, J. K.; Thingstad, T. F.; Töpper, B., Organic carbon and mineral nutrients limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea. Accepted version. Copyright 2011 The Authors. The published version is available on the publisher’s webpage: http://dx.doi.org/10.1007/s00300-010-0944-3 Paper II: Journal of the Marine Biological Association of the United Kingdom 87(3), Vargas, C.; Cuevas, L. A.; González, H. E.; Daneri, G., Bacterial growth response to copepod grazing in aquatic ecosystems, pp. 667-674. Published version. Copyright 2007 Marine Biological Association of the United Kingdom. Published by Cambridge University Press. The published version is also available at: http://dx.doi.org/10.1017/S0025315407056275 Paper III: Cuevas, L. A.; Tanaka, T.; Thingstad, T. F.; Børsheim, K. Y.; Egge, J.; Skjoldal, E. F.; Thyrhaug, R.; Töpper, B., (2010), Effect of supply ratios of glucose-C to mineral nutrients on availability of glucose for bacteria and of phosphate for phytoplankton and bacteria for two arctic mesocosm experiments. Draft version. Full text not available in BORA. Paper IV: Aquatic Microbial Ecology 61, Thingstad, T. F.; Cuevas, L. A., Nutrient pathways through the microbial food web: Principles and predictability discussed, based on five different experiments, pp. 249-260. Published version. Copyright 2010 Inter-Research. Reproduced with permission. Paper V: Cuevas, L. A.; Thingstad, T. F., (2010), Global patterns of bacterioplankton dynamics: Relationship between bacterial biomass and production in open ocean regions. Draft version. Full text not available in BORA. urn:isbn:978-82-308-1670-7 (print version) https://hdl.handle.net/1956/4472 |
op_rights |
The author. Copyright the author. All rights reserved |
op_doi |
https://doi.org/10.1007/s00300-010-0944-310.1017/S0025315407056275 |
container_title |
Polar Biology |
container_volume |
34 |
container_issue |
6 |
container_start_page |
871 |
op_container_end_page |
882 |
_version_ |
1766302417389879296 |
spelling |
ftunivbergen:oai:bora.uib.no:1956/4472 2023-05-15T14:28:15+02:00 Bacterial growth control in marine environments : from experimental approaches to comparative analyses Cuevas, Luis Antonio 2010-12-14 application/pdf https://hdl.handle.net/1956/4472 eng eng The University of Bergen Paper I: Polar Biology, Cuevas, L. A.; Egge, J. K.; Thingstad, T. F.; Töpper, B., Organic carbon and mineral nutrients limitation of oxygen consumption, bacterial growth and efficiency in the Norwegian Sea. Accepted version. Copyright 2011 The Authors. The published version is available on the publisher’s webpage: http://dx.doi.org/10.1007/s00300-010-0944-3 Paper II: Journal of the Marine Biological Association of the United Kingdom 87(3), Vargas, C.; Cuevas, L. A.; González, H. E.; Daneri, G., Bacterial growth response to copepod grazing in aquatic ecosystems, pp. 667-674. Published version. Copyright 2007 Marine Biological Association of the United Kingdom. Published by Cambridge University Press. The published version is also available at: http://dx.doi.org/10.1017/S0025315407056275 Paper III: Cuevas, L. A.; Tanaka, T.; Thingstad, T. F.; Børsheim, K. Y.; Egge, J.; Skjoldal, E. F.; Thyrhaug, R.; Töpper, B., (2010), Effect of supply ratios of glucose-C to mineral nutrients on availability of glucose for bacteria and of phosphate for phytoplankton and bacteria for two arctic mesocosm experiments. Draft version. Full text not available in BORA. Paper IV: Aquatic Microbial Ecology 61, Thingstad, T. F.; Cuevas, L. A., Nutrient pathways through the microbial food web: Principles and predictability discussed, based on five different experiments, pp. 249-260. Published version. Copyright 2010 Inter-Research. Reproduced with permission. Paper V: Cuevas, L. A.; Thingstad, T. F., (2010), Global patterns of bacterioplankton dynamics: Relationship between bacterial biomass and production in open ocean regions. Draft version. Full text not available in BORA. urn:isbn:978-82-308-1670-7 (print version) https://hdl.handle.net/1956/4472 The author. Copyright the author. All rights reserved VDP::Mathematics and natural science: 400::Basic biosciences: 470::Biochemistry: 476 Doctoral thesis 2010 ftunivbergen https://doi.org/10.1007/s00300-010-0944-310.1017/S0025315407056275 2023-03-14T17:43:51Z To understand (1) the role of heterotrophic bacteria in the biogeochemical cycles, (2) the fate of the organic carbon and mineral nutrients, and (3) the flow of energy to higher trophic levels, we need to understand how bacterial growth is controlled in marine environments. The main hypotheses about the control of bacterial growth are based on the studies about bottomup control (limiting resources) and top-down control (predators and viruses), that is, how bacteria interact with their ‘neighbors’ in the microbial food web. Using micro- and mesocosm experiments, comparative analyses, plus an idealized model to test different predictions, this thesis evaluates the role of heterotrophic bacteria in the utilization of organic matter in different marine environments. The effects of mineral nutrients, organic carbon and predator control over bacterial growth are also investigated. Bacterial growth rates can be controlled by carbon or/and mineral nutrients depending on the biological oceanographic conditions (Papers I and II). Both types of bacterial growth limitation (carbon and mineral nutrient) can co-exist simultaneously depending on the structure of the microbial food web, mineral nutrient and labile organic carbon concentration. Dominance of nano-phytoplankton, which can be grazed by rapidly responding micro-zooplankton (e.g. idealized model in Paper IV), will shifts more rapidly to a carbon limited bacterial growth, thus, heterotrophic bacteria may use all labile organic carbon preventing its accumulation in the euphotic zone (Paper I). Contrary, dominance of large diatoms, which can be grazed by slowly responding copepods, can keep labile organic carbon produced by copepod (e.g. sloppy feeding) and bacterial growth can be limited by mineral nutrients (i.e. competition of nutrients with diatoms) (Paper II) shifting the system slowly to carbon limited bacterial growth control. Different rates of organic carbon utilization by bacteria can be estimated in manipulated mesocosm experiments by adding mineral nutrients ... Doctoral or Postdoctoral Thesis Arctic Polar Biology Copepods University of Bergen: Bergen Open Research Archive (BORA-UiB) Polar Biology 34 6 871 882 |