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Pelagic community respiration on the continental shelf off Georgia, USA

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Abstract

The South Atlantic Bight (SAB) has been a focus for the study of continental shelf ecosystem respiration during the past two decades. However, two questions concerning respiration in this area have yet to be answered. First, why do previous estimates of respiration in the SAB exceed measured carbon fixation rates by almost an order of magnitude? Second, considering that bacteria are responsible for most of the pelagic community respiration in the SAB, why is respiration almost uniform from the coastline to the shelf break, while bacterial production estimates decrease offshore? This study addresses these critical questions by presenting new pelagic community respiration data that were collected across the entire width of the continental shelf off Georgia, USA from June 2003 to May 2006. The respiration was calculated as in vitro changes of dissolved oxygen and dissolved inorganic carbon concentrations during deck incubations. The measured respiration rates ranged from 0.3(±0.1) to 21.2(±1.4) mmol m−3 day−1. They followed a clear seasonal pattern, being lowest over the entire shelf in winter and reaching maxima in summer. Summertime respiration rates were highest on the inner shelf and decreased with distance offshore. Consistent with this trend, bacterial abundance measurements taken during the sampling month of July 2005 followed a pattern of seaward decline. The SAB organic carbon fluxes calculated from the respiration data are close to the estimates for primary production, which resolves a long-standing mystery regarding perceived carbon imbalance in the SAB.

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Abbreviations

BOD:

Biochemical oxygen demand

CFZ:

Coastal frontal zone

DIC:

Dissolved inorganic carbon

DO:

Dissolved oxygen

pCO2 :

Partial pressure of carbon dioxide

RQ:

Respiratory quotient

SAB:

South Atlantic Bight

SSS:

Sea surface salinity

SST:

Sea surface temperature

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Acknowledgments

Support for this work was provided by the NSF grant (OCE-0425153) and the Georgia Coastal Ecosystem LTER program (OCE-9982133). Jack Blanton provided ship time for the June 2003 cruise. We thank the crew of R/V Savannah and R/V Cape Hatteras for their wonderful cooperation in the field. We are grateful to L. R. Pomeroy, E. M. Smith, and C. S. Hopkinson for constructive discussion. The paper was greatly improved with the input of Associate Editor Melany Fisk and three anonymous reviewers. We also want to thank G. Han for laboratory support, and Justin Hartmann, Matt Erickson, Ed Sheppard, Feizhou Chen, and Haibing Ding for help with field sampling.

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Author notes

  1. Li-Qing Jiang

    Present address: National Oceanic and Atmospheric Administration, Climate Program Office, Silver Spring, MD, 20910, USA

  2. Julia Diaz

    Present address: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA

Authors and Affiliations

  1. Department of Marine Sciences, The University of Georgia, Athens, GA, 30602, USA

    Li-Qing Jiang, Wei-Jun Cai, Yongchen Wang, Julia Diaz, Patricia L. Yager & Xinping Hu

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  1. Li-Qing Jiang
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Correspondence to Wei-Jun Cai.

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Jiang, LQ., Cai, WJ., Wang, Y. et al. Pelagic community respiration on the continental shelf off Georgia, USA. Biogeochemistry 98, 101–113 (2010). https://doi.org/10.1007/s10533-009-9379-8

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