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Title

Warming effects on marine microbial food web processes: how far can we go when it comes to predictions?

AuthorsSarmento, Hugo CSIC ORCID; Montoya, José M. CSIC ORCID; Vázquez-Domínguez, Evaristo CSIC ORCID; Vaqué, Dolors CSIC ORCID ; Gasol, Josep M. CSIC ORCID
KeywordsTemperature
Bacteria
Heterotrophic nanoflagellate
Grazing
Metabolic theory of ecology
Activation energy
Issue Date12-Jul-2010
PublisherRoyal Society (Great Britain)
CitationPhilosophical transactions of the Royal Society 365(1549): 2137-2149 (2010)
AbstractPrevisions of a warmer ocean as a consequence of climatic change point to a 2–6°C temperature rise during this century in surface oceanic waters. Heterotrophic bacteria occupy the central position of the marine microbial food web, and their metabolic activity and interactions with other compartments within the web are regulated by temperature. In particular, key ecosystem processes like bacterial production (BP), respiration (BR), growth efficiency and bacterial–grazer trophic interactions are likely to change in a warmer ocean. Different approaches can be used to predict these changes. Here we combine evidence of the effects of temperature on these processes and interactions coming from laboratory experiments, space-for-time substitutions, long-term data from microbial observatories and theoretical predictions. Some of the evidence we gathered shows opposite trends to warming depending on the spatio-temporal scale of observation, and the complexity of the system under study. In particular, we show that warming (i) increases BR, (ii) increases bacterial losses to their grazers, and thus bacterial–grazer biomass flux within the microbial food web, (iii) increases BP if enough resources are available (as labile organic matter derived from phytoplankton excretion or lysis), and (iv) increases bacterial losses to grazing at lower rates than BP, and hence decreasing the proportion of production removed by grazers. As a consequence, bacterial abundance would also increase and reinforce the already dominant role of microbes in the carbon cycle of a warmer ocean
Description13 pages, 4 figures, 1 table
Publisher version (URL)https://doi.org/10.1098/rstb.2010.0045
URIhttp://hdl.handle.net/10261/24907
DOI10.1098/rstb.2010.0045
ISSN0962-8436
Appears in Collections:(ICM) Artículos

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