Abstract
Natural hydrocarbon seeps occur on the sea floor along continental margins, and account for up to 47% of the oil released into the oceans1. Hydrocarbon seeps are known to support local benthic productivity2, but little is known about their impact on photosynthetic organisms in the overlying water column. Here we present observations with high temporal and spatial resolution of chlorophyll concentrations in the northern Gulf of Mexico using in situ and shipboard flow-through fluorescence measurements from May to July 2012, as well as an analysis of ocean-colour satellite images from 1997 to 2007. All three methods reveal elevated chlorophyll concentrations in waters influenced by natural hydrocarbon seeps. Temperature and nutrient profiles above seep sites suggest that nutrient-rich water upwells from depth, which may facilitate phytoplankton growth and thus support the higher chlorophyll concentrations observed. Because upwelling occurs at natural seep locations around the world1,2,3, we conclude that offshore hydrocarbon seeps, and perhaps other types of deep ocean vents and seeps at depths exceeding 1,000 m, may influence biogeochemistry and productivity of the overlying water column.
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Change history
17 February 2016
In the version of the Letter originally published online, the Methods section was omitted. The Methods can now be found in the Supplementary Information published online.
References
Judd, A. G. The global importance and context of methane escape from the seabed. Geo-Mar. Lett. 23, 147–154 (2003).
Hovland, M., Jensen, S. & Fichler, C. Methane and minor oil macro-seep systems—their complexity and environmental significance. Mar. Geol. 332–334, 163–173 (2012).
Milkov, A. V. Global gas flux from mud volcanoes: a significant source of fossil methane in the atmosphere and the ocean. Geophys. Res. Lett. 30, 1037 (2003).
Roberts, H. H. & Carney, R. S. Evidence of episodic fluid, gas, and sediment venting on the northern Gulf of Mexico continental slope. Econ. Geol. 92, 863–879 (1997).
MacDonald, I. R. et al. Transfer of hydrocarbons from natural seeps to the water column and atmosphere. Geofluids 2, 95–107 (2002).
Solomon, E. A., Kastner, M., MacDonald, I. R. & Leifer, I. Considerable methane fluxes to the atmosphere from hydrocarbon seeps in the Gulf of Mexico. Nature Geosci. 2, 561–565 (2009).
Garcia-Pineda, O., MacDonald, I., Zimmer, B., Shedd, B. & Roberts, H. Remote-sensing evaluation of geophysical anomaly sites in the outer continental slope, northern Gulf of Mexico. Deep-Sea Res. II 57, 1859–1869 (2010).
Macdonald, I. R. et al. Natural oil-slicks in the Gulf of Mexico visible from space. J. Geophys. Res. 98, 16351–16364 (1993).
MacDonald, I. R. et al. Natural and unnatural oil slicks in the Gulf of Mexico. J. Geophys. Res. http://dx.doi.org/10.1002/2015JC011062 (2015).
Roberts, H. H., Feng, D. & Joye, S. B. Cold-seep carbonates of the middle and lower continental slope, northern Gulf of Mexico. Deep-Sea Res. II 57, 2040–2054 (2010).
Leifer, I., Jeuthe, H., Gjøsund, S. H. & Johansen, V. Engineered and natural marine seep, bubble-driven buoyancy flows. J. Phys. Oceanogr. 39, 3071–3090 (2009).
Sauter, E. J. et al. Methane discharge from a deep-sea submarine mud volcano into the upper water column by gas hydrate-coated methane bubbles. Earth Planet. Sci. Lett. 243, 354–365 (2006).
McGillicuddy, D. J. Jr et al. Eddy/wind interactions stimulate extraordinary mid-ocean plankton blooms. Science 316, 1021–1026 (2007).
Körber, J.-H. et al. Natural oil seepage at Kobuleti Ridge, eastern Black Sea. Mar. Pet. Geol. 50, 68–82 (2014).
Chekalyuk, A., Barnard, A., Quigg, A., Hafez, M. & Zhao, Y. Aquatic laser fluorescence analyzer: field evaluation in the northern Gulf of Mexico. Opt. Express 22, 21641–21656 (2014).
Head, I. M., Jones, D. M. & Roling, W. F. Marine microorganisms make a meal of oil. Nature Rev. Microbiol. 4, 173–182 (2006).
Atlas, R. M. Microbial degradation of petroleum hydrocarbons: an environment perspective. Microbiol. Rev. 45, 180–209 (1981).
Dunstan, W., Atkinson, L. & Natoli, J. Stimulation and inhibition of phytoplankton growth by low molecular weight hydrocarbons. Mar. Biol. 31, 305–310 (1975).
Huang, Y. J. et al. The chronic effects of oil pollution on marine phytoplankton in a subtropical bay, China. Environ. Monit. Assess. 176, 517–530 (2011).
Prouse, N. J., Gordon, D. C. Jr & Keizer, P. D. Effects of low concentrations of oil accommodated in sea water on the growth of unialgal marine phytoplankton cultures. J. Fish. Res. Board Can. 33, 810–818 (1976).
Dalby, A. P., Kormas, K. A., Christaki, U. & Karayanni, H. Cosmopolitan heterotrophic microeukaryotes are active bacterial grazers in experimental oil-polluted systems. Environ. Microbiol. 10, 47–56 (2008).
Stoeck, T. & Edgcomb, V. in Handbook of Hydrocarbon and Lipid Microbiology (ed. Timmis, K. N.) 2423–2434 (Springer, 2010).
Bate, G. & Crafford, S. D. Inhibition of phytoplankton photosynthesis by the WSF of used lubricating oil. Mar. Pollut. Bull. 16, 401–404 (1985).
Vargo, G., Hutchins, M. & Almquist, G. The effect of low, chronic levels of no. 2 fuel oil on natural phytoplankton assemblages in microcosms: 1. Species composition and seasonal succession. Mar. Environ. Res. 6, 245–264 (1982).
Rogerson, A. & Berger, J. Effect of crude oil and petroleum-degrading micro-organisms on the growth of freshwater and soil protozoa. J. Gen. Microbiol. 124, 53–59 (1981).
Teal, J. M. & Howarth, R. W. Oil-spill studies—a review of ecological effects. Environ. Manage. 8, 27–43 (1984).
Fleeger, J. W., Carman, K. R. & Nisbet, R. M. Indirect effects of contaminants in aquatic ecosystems. Sci. Total Environ. 317, 207–233 (2003).
Juhl, A. R. & Murrell, M. C. Interactions between nutrients, phytoplankton growth, and microzooplankton grazing in a Gulf of Mexico estuary. Aquat. Microb. Ecol. 38, 147–156 (2005).
Acknowledgements
We thank the science parties and ship’s crew of the RV Endeavor for their assistance with multiple shipboard operations. We thank O. Garcia-Pineda for his assistance in providing the TCNNA-derived database of putative natural oil seeps. We thank K. Geddes for assistance with chlorophyll extractions used in ALFA calibrations. This work is supported by The Gulf of Mexico Research Initiative’s (GOMRI) ECOGIG consortium, with additional support from NSF grant NSF-OCE-0928495 to J.P.M. and NASA grant NNX10AT99G to A.S. This is LDEO contribution number 7951, and ECOGIG contribution number 365. Data are available from the Gulf of Mexico Research Initiative Information and Data Cooperative (http://data.gulfresearchinitiative.org: R1.x132.134:0003, R1.x132.134:0005, R1.x132.139:0025, R1.x132.137:0045).
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A.S., A.R.J., B.Y., J.P.M. and N.A.D. designed the study. M.H., A.C. and S.P. helped analyse the data. N.A.D., A.R.J. and A.S. wrote the paper. I.R.M. collected and processed SAR images to produce databases of oil slicks and putative seep locations across the Gulf of Mexico. A.S. and S.P. collected and processed satellite images and data for analysis of chlorophyll concentrations associated with slick events. N.A.D., M.H. and A.C. collected and processed data for the shipboard in situ fluorometry. N.A.D., M.H., A.R.J., S.C.W. and J.P.M. deployed the CTD and analysed the data. S.C.W. and J.P.M. collected and processed nutrients samples. All authors discussed the results and commented on the manuscript.
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D’souza, N., Subramaniam, A., Juhl, A. et al. Elevated surface chlorophyll associated with natural oil seeps in the Gulf of Mexico. Nature Geosci 9, 215–218 (2016). https://doi.org/10.1038/ngeo2631
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DOI: https://doi.org/10.1038/ngeo2631
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