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Dissolved carbon, greenhouse gases, and δ13C dynamics in four estuaries across a land use gradient

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Abstract

Land use is a well known driver of nutrient dynamics in estuaries, however less is known about how land use may influence the coastal carbon (C) cycle. Here, we report dissolved carbon concentrations, δ13C isotopic signatures, and water–air CO2 and CH4 fluxes for four Australian estuaries with contrasting catchment land use ranging from 9 to 72% natural. Water samples were collected during dry and wet hydrologic extremes. Dissolved organic carbon (DOC) concentrations were highest and total dissolved nitrogen and dissolved phosphorous were lowest in the least impacted estuary (Pine Creek). The DOC δ13C signature was enriched for the estuary with 91% urban-agricultural land use (Coffs Creek), implying a shift in the source of DOC along the land use gradient. Low DOC and high nutrient availability decreased CO2 fluxes to the atmosphere in the impacted systems during both wet and dry conditions, and increased CH4 concentrations and fluxes during the wet conditions. Variability of CO2 and CH4 were influenced by multiple drivers including hydrologic forcing, dissolved nutrients, as well as shifts in the nature of allochthonous versus autochthonous sources within each estuary.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We acknowledge Summer Barron, Ashley McMahon, James Sippo, Mitchell Call and Damien Eggeling for their assistance with field surveys, and Coffs Harbour City Council (CHCC) for their assistance with logistics. We acknowledge funding from the Australian Research Council (DE140101733, DE150100581 and LE120100156).

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Authors and Affiliations

  1. National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW, Australia

    Arun Looman, Isaac R. Santos, Douglas R. Tait & Ceylena Holloway

  2. School of Environment, Science, and Engineering, Southern Cross University, Lismore, NSW, Australia

    Arun Looman, Isaac R. Santos & Damien T. Maher

  3. Department of Biology, University of Regina, Regina, Canada

    Jackie Webb

  4. Southern Cross Geoscience, Southern Cross University, Lismore, NSW, Australia

    Douglas R. Tait & Damien T. Maher

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  1. Arun Looman
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  2. Isaac R. Santos
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  3. Douglas R. Tait
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  4. Jackie Webb
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  5. Ceylena Holloway
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Correspondence to Arun Looman.

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Looman, A., Santos, I.R., Tait, D.R. et al. Dissolved carbon, greenhouse gases, and δ13C dynamics in four estuaries across a land use gradient. Aquat Sci 81, 22 (2019). https://doi.org/10.1007/s00027-018-0617-9

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