Potential overestimation of community respiration in the western Pacific boundary ocean : what causes the putative net heterotrophy in oligotrophic systems?

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Huang, Yibin and Chen, Bingzhang and Huang, Bangqin and Zhou, Hui and Yuan, Yongquan (2019) Potential overestimation of community respiration in the western Pacific boundary ocean : what causes the putative net heterotrophy in oligotrophic systems? Limnology and Oceanography, 64 (5). pp. 2202-2219. ISSN 0024-3590 (https://doi.org/10.1002/lno.11179)

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Abstract

Microbial metabolism is of great importance in affecting the efficiency of biological pump and global carbon cycles. However, the metabolic state of the oligotrophic ocean, the largest biome on Earth, remains contentious. We examined the planktonic and bacterial metabolism using in vitro incubations along the western Pacific boundary during September and October 2016. The integrated gross primary production (GPP) of the photic zone exhibited higher values in the region of 2°–8°N along 130°E and the western Luzon Strait, which is consistent with the regional variability of nutrients in the different ocean provinces. Spatially, the community respiration (CR) was less variable than the GPP and slightly exceeded the GPP at most of the sampling stations. Overall, the in vitro incubation results suggest a prevailing heterotrophic state in this region. A comparison of the metabolic rates from the in vitro incubations with recently published biogeochemical model results in the same region shows that our observed GPP values were close to those predicted by the model, but the measured CR was approximately 30% higher than the modeled values. We also found that most of the in vitro CR estimates were higher than the upper range of the empirical CR estimated from the sum of the contributions of the main trophic groups. Conversely, the estimates of the empirical CR support the rationality of the CR predicted by the biogeochemical model. In general, the results indicate that systematic net heterotrophy is more likely a result of the overestimation of CR measured by the light–dark bottle incubation experiments, although the exact cause of the methodological problem remains unknown.

ORCID iDs

Huang, Yibin, Chen, Bingzhang ORCID logoORCID: https://orcid.org/0000-0002-1573-7473, Huang, Bangqin, Zhou, Hui and Yuan, Yongquan;
  • Item type:Article
    ID code:67862
    Dates:
    Date
    Event
    30 September 2019
    Published
    6 May 2019
    Published Online
    25 March 2019
    Accepted
    Notes:This is the peer reviewed version of the following article: Huang, Y, Chen, B, Huang, B, Zhou, H & Yuan, Y 2019, 'Potential overestimation of community respiration in the western Pacific boundary ocean: what causes the putative net heterotrophy in oligotrophic systems?' Limnology and Oceanography, pp. 1-18., which has been published in final form at https://doi.org/10.1002/lno.11179. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
    Subjects:Science > Mathematics > Probabilities. Mathematical statistics
    Geography. Anthropology. Recreation > Oceanography
    Department:Faculty of Science > Mathematics and Statistics
    Depositing user: Pure Administrator
    Date deposited:15 May 2019 09:57
    Last modified:03 Dec 2024 22:03
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/67862
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