naa a22 4500 510737838 CHVBK 20180411083017.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11284-013-1065-6 doi (NATIONALLICENCE)springer-10.1007/s11284-013-1065-6 Gross primary productivity of phytoplankton and planktonic respiration in inland floodplain wetlands of southeast Australia: habitat-dependent patterns and regulating processes [Elektronische Daten] [Tsuyoshi Kobayashi, Timothy Ralph, Darren Ryder, Simon Hunter] Gross primary productivity (GPP) of phytoplankton and planktonic respiration (PR) (i.e., planktonic metabolism) are critical pathways for carbon transformation in many aquatic ecosystems. In inland floodplain wetlands with variable inundation regimes, quantitative measurements of GPP and PR are rare and their relationships with wetland environmental conditions are largely unknown. We measured PR and the GPP of phytoplankton using light and dark biological oxygen demand bottles in open waters of channel and non-channel floodplain habitats of inland floodplain wetlands of southeast Australia that had been inundated by environmental water. Overall, GPP varied from 3.7 to 405.5mgCm−3h−1 (mean±standard error: 89.4±9.2mgCm−3h−1, n=81), PR from 1.5 to 251.6mgCm−3h−1 (43.2±5.6mgCm−3h−1, n=81), and GPP/PR from 0.2 to 15.6 (3.0±0.3, n=81). In terms of wetland environmental conditions, total nitrogen (TN) ranged from 682.0 to 14,700.0mgm−3 (mean±standard error: 2,643.0±241.6mgm−3, n=81), total phosphorus (TP) from 48.0 to 1,405.0mgm−3 (316.8±31.4mgm−3, n=81), and dissolved organic carbon (DOC) from 1.9 to 46.3gm−3 (22.0±1.6gm−3, n=81). Using ordinary least-squares multiple regression analyses, the rates of GPP and PR, and their ratio (GPP/PR) were modeled as a function of TN, TP, and DOC that had been measured concomitantly. The "best” models predicted GPP and GPP/PR ratio in channel habitats as a function of DOC; and GPP, PR, and GPP/PR in non-channel floodplain habitats as a function of TN and/or TP. The models explained between 46 and 74% of the variance in channel habitats and between 17 and 87% of the variance in non-channel floodplain habitats. Net autotrophy (mean GPP/PR 3.0) of planktonic metabolism in our work supports the prevailing view that wetlands are a net sink for carbon dioxide. We propose a nutrient-DOC framework, combined with hydrological and geomorphological delineations, to better predict and understand the planktonic metabolism in inland floodplain wetlands. The Ecological Society of Japan, 2013 Carbon cycling and transformation nationallicence Channel and floodplain habitats nationallicence Environmental water nationallicence Predictive model nationallicence Semi-arid wetlands nationallicence Kobayashi Tsuyoshi Science Division, Office of Environment and Heritage NSW, Department of Premier and Cabinet, PO Box A290, 1232, Sydney South, NSW, Australia aut Ralph Timothy Department of Environment and Geography, Macquarie University, 2109, Sydney, NSW, Australia aut Ryder Darren Ecosystem Management, University of New England, 2351, Armidale, NSW, Australia aut Hunter Simon Science Division, Office of Environment and Heritage NSW, Department of Premier and Cabinet, PO Box A290, 1232, Sydney South, NSW, Australia aut Ecological Research Springer Japan 28/5(2013-09-01), 833-843 0912-3814 28:5<833 2013 28 11284 https://doi.org/10.1007/s11284-013-1065-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11284-013-1065-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kobayashi Tsuyoshi Science Division, Office of Environment and Heritage NSW, Department of Premier and Cabinet, PO Box A290, 1232, Sydney South, NSW, Australia aut NATIONALLICENCE 700 1- Ralph Timothy Department of Environment and Geography, Macquarie University, 2109, Sydney, NSW, Australia aut NATIONALLICENCE 700 1- Ryder Darren Ecosystem Management, University of New England, 2351, Armidale, NSW, Australia aut NATIONALLICENCE 700 1- Hunter Simon Science Division, Office of Environment and Heritage NSW, Department of Premier and Cabinet, PO Box A290, 1232, Sydney South, NSW, Australia aut NATIONALLICENCE 773 0- Ecological Research Springer Japan 28/5(2013-09-01), 833-843 0912-3814 28:5<833 2013 28 11284 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer