Effects of increased atmospheric CO 2 on small and intermediate sized osmotrophs during a nutrient induced phytoplankton bloom

By A. Paulino, J. Egge, A. Larsen. 2007

104 citations recorded by the source corpus.

Abstract. We report the transient population dynamic response of the osmotrophic community initiated by a nutrient pulse in mesocosms exposed to different pCO2 levels. Differences in phytoplankton and heterotrophic bacteria abundances associated with the CO2 treatment are also described. Coastal seawater was enclosed in floating mesocosms (27 m3) and nutrients were supplied initially in order to stimulate growth of microbial organisms, including the coccolitophorid Emiliania huxleyi. The mesocosms were modified to achieve 350 μatm (1×CO2), 700 μatm (2×CO2) and 1050 μatm (3×CO2) CO2 pressure. The temporal dynamics was related to nutrient conditions in the enclosures. Numerically small osmotrophs (picoeukaryotes and Synechoccocus sp.) dominated initially and towards the end of the experiment, whereas intermediate sized osmotrophs bloomed as the initial bloom of small sized osmotrophs ceased. Maximum concentrations of E. huxleyi were approximately 4.6×103 cells ml−1 whereas other intermediate sized osmotrophs reached approximately twice as high concentrations. The osmotrophic succession pattern did not change, and neither were we able to detect differences with regard to presence or absence of specific osmotrophic taxa as a consequence of altered pCO2. Towards the end of the experiment we did, however, record significantly higher picoeukaryotic- and lower Synechococcus-abundances in the higher CO2 treatments. Slightly increased cell concentrations of E. huxleyi and other nanoeukaryotes were also recorded at elevated pCO2 on certain days.

Subfields: Molecular Biology, Oceanography

View Paper: https://www.semanticscholar.org/paper/35575f286c9f57a12822e2a9ccf736081c838947

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Citations in the corpus

Microzooplankton grazing and phytoplankton growth in marine mesocosms with increased CO 2 levels (2008, methodology): “The general temporal dynamic of the phytoplankton community, observed in our bottle incubation experiments, mirrored the dynamic observed inside the mesocosms by other studies (Egge et al., 2007; Paulino et al., 2007; Schulz et al., 2007).”
Environmental control of open‐ocean phytoplankton groups: Now and in the future (2010, background): “Paulino et al. (2008) observed a different response in another field study, in that the abundance of Synechococcus decreased with increasing CO2 by the end of the 24-d experiment.”
Arctic microbial community dynamics influenced by elevated CO2 levels (2012, background): “Paulino et al. (2008) reported an increased abundance of picophy-toplankton in a high CO 2 mesocosm; however, this was towards the end of the experiment when all nutrients were depleted.”
Mesocosm Experiments as a Tool for Ecological Climate-Change Research (2013, unknown): “…et al. (2003) Le Precipitation Peren. plants Eco M S L Le Warming Peren. plants Comm M S M Patrick et al. (2012) M CO2_pH Microinverts Comm L M M Paulino et al. (2008) M Warming Macroinverts Pop M S M Pearce et al. (1998) T Precipitation Peren. plants Eco L S M Pegoraro et al. (2005a) T…”
Primary production during nutrient-induced blooms at elevated CO2 concentrations (2009, background): “We note, however, that the highest primary production in this fraction was measured on Day 6, coinciding with the minimum in abundance of small organisms potentially passing a 1μm filter (Paulino et al., 2007).”
Coupling of heterotrophic bacteria to phytoplankton bloom development at different pCO 2 levels: a mesocosm study (2008, background): “Comparison with flow cytometry (Paulino et al., 2007) indicated that our numbers were overestimated due to the presence of big viruses within a size range 10 of 100–200 nm which could not be reliably distinguished from bacteria by epifluorescence microscopy.”
Summary for Policymakers (2022, unknown): “In another study, Pelejero et al. (2005) developed a reconstruction of seawater pH spanning the period 1708-1988, based on the boron isotopic composition (ä(11)B) of a long-lived massive coral (Porites) from Flinders Reef in the western Coral Sea of the southwestern Pacific.”
Mesocosm CO 2 perturbation studies: from organism to community level (2008, background): “, 2007) PeECE III – phytoplankton composition and cell cycle during bloom development (Paulino et al., 2007) – inorganic nutrient utilization, nutrient stoichiometry (Schulz et al.”