Journal article
Dissolved carbon, greenhouse gases, and δ13C dynamics in four estuaries across a land use gradient
Aquatic Sciences, Vol.81(1), pp.1-15
03/01/2019
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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.
Details
- Title
- Dissolved carbon, greenhouse gases, and δ13C dynamics in four estuaries across a land use gradient
- Creators
- Arun Looman - 0000000121532610 grid.1031.3 School of Environment, Science, and Engineering Southern Cross University Lismore NSW AustraliaIsaac Santos - 0000000121532610 grid.1031.3 School of Environment, Science, and Engineering Southern Cross University Lismore NSW AustraliaDouglas Tait - 0000000121532610 grid.1031.3 Southern Cross Geoscience Southern Cross University Lismore NSW AustraliaJackie Webb - 0000 0004 1936 9131 grid.57926.3f Department of Biology University of Regina Regina CanadaCeylena Holloway - 0000000121532610 grid.1031.3 National Marine Science Centre Southern Cross University Coffs Harbour NSW AustraliaDamien Maher - 0000000121532610 grid.1031.3 Southern Cross Geoscience Southern Cross University Lismore NSW Australia
- Publication Details
- Aquatic Sciences, Vol.81(1), pp.1-15
- Publisher
- Birkhaeuser Science; Cham
- Grant note
- DE140101733; DE150100581; LE120100156 / Australian Research Council (http://dx.doi.org/10.13039/501100000923)
- Identifiers
- 991012926966602368
- Copyright
- © Springer Nature Switzerland AG 2019
- Academic Unit
- National Marine Science Centre; Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article