Autochthonous origin of semi-labile dissolved organic carbon in a large monomictic lake (Lake Biwa): carbon stable isotopic evidence
Semi-labile dissolved organic carbon (DOC) plays an important role in the transport and hypolimnetic remineralization of carbon in large freshwater lakes. However, sources of semi-labile DOC in lakes remain unclear. This study used a carbon stable isotope approach to examine relative contributions o...
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| Veröffentlicht in: | Limnology 2010-08, Vol.11 (2), p.143-153 |
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| creator | Maki, Koh Kim, Chulgoo Yoshimizu, Chikage Tayasu, Ichiro Miyajima, Toshihiro Nagata, Toshi |
| description | Semi-labile dissolved organic carbon (DOC) plays an important role in the transport and hypolimnetic remineralization of carbon in large freshwater lakes. However, sources of semi-labile DOC in lakes remain unclear. This study used a carbon stable isotope approach to examine relative contributions of autochthonous and allochthonous sources to semi-labile DOC. Vertical and seasonal variations in the concentration and carbon stable isotope ratio (δ¹³C) of DOC were determined in large (surface area 674 km²; maximum depth 104 m), monomictic Lake Biwa. A sharp vertical gradient of δ¹³C of DOC (δ¹³C-DOC) during the stratification period [mean ± standard error (SE) −25.5 ± 0.1 and −26.0 ± 0.0‰ in the epi- and hypolimnion, respectively] indicated the accumulation of ¹³C-rich DOC in the epilimnion. Vertical mixing explained the intermediate values of δ¹³C-DOC (−25.7 ± 0.0‰) measured throughout the water column during the overturn period. Both DOC concentration and δ¹³C-DOC decreased in the hypolimnion during stratification, indicating selective remineralization of ¹³C-rich DOC. Using a two-component mixing model, we estimated the δ¹³C value of semi-labile DOC to be −22.2 ± 0.3‰, which was close to the δ¹³C of particulate organic carbon collected in the epilimnion during productive seasons (−22.7 ± 0.7‰) but much higher than the δ¹³C-DOC in river waters (−26.5 ± 0.1‰). Semi-labile DOC appeared to be mainly autochthonous in origin, produced by planktonic communities during productive seasons. The spatiotemporal uncoupling between production and remineralization of semi-labile DOC implies that hypolimnetic oxygen consumption may be affected by pelagic primary production during productive seasons of the preceding year. |
| doi_str_mv | 10.1007/s10201-009-0299-z |
| format | Article |
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However, sources of semi-labile DOC in lakes remain unclear. This study used a carbon stable isotope approach to examine relative contributions of autochthonous and allochthonous sources to semi-labile DOC. Vertical and seasonal variations in the concentration and carbon stable isotope ratio (δ¹³C) of DOC were determined in large (surface area 674 km²; maximum depth 104 m), monomictic Lake Biwa. A sharp vertical gradient of δ¹³C of DOC (δ¹³C-DOC) during the stratification period [mean ± standard error (SE) −25.5 ± 0.1 and −26.0 ± 0.0‰ in the epi- and hypolimnion, respectively] indicated the accumulation of ¹³C-rich DOC in the epilimnion. Vertical mixing explained the intermediate values of δ¹³C-DOC (−25.7 ± 0.0‰) measured throughout the water column during the overturn period. Both DOC concentration and δ¹³C-DOC decreased in the hypolimnion during stratification, indicating selective remineralization of ¹³C-rich DOC. Using a two-component mixing model, we estimated the δ¹³C value of semi-labile DOC to be −22.2 ± 0.3‰, which was close to the δ¹³C of particulate organic carbon collected in the epilimnion during productive seasons (−22.7 ± 0.7‰) but much higher than the δ¹³C-DOC in river waters (−26.5 ± 0.1‰). Semi-labile DOC appeared to be mainly autochthonous in origin, produced by planktonic communities during productive seasons. The spatiotemporal uncoupling between production and remineralization of semi-labile DOC implies that hypolimnetic oxygen consumption may be affected by pelagic primary production during productive seasons of the preceding year.</description><identifier>ISSN: 1439-8621</identifier><identifier>EISSN: 1439-863X</identifier><identifier>DOI: 10.1007/s10201-009-0299-z</identifier><language>eng</language><publisher>Japan: Japan : Springer Japan</publisher><subject>Autochthony and allochthony ; Biomedical and Life Sciences ; Carbon ; Carbon stable isotope ratio ; Dissolved organic carbon ; Ecology ; Environment ; Epilimnion ; Freshwater & Marine Ecology ; Freshwater lakes ; Hypolimnion ; Isotopes ; Large lake ; Life Sciences ; Limnology ; Mixing model ; Oxygen consumption ; Particulate organic carbon ; Primary production ; Ratios ; Research Paper ; Seasonal variations ; Seasons ; Semi-labile dissolved organic carbon ; Stable isotopes ; Water column ; Water depth</subject><ispartof>Limnology, 2010-08, Vol.11 (2), p.143-153</ispartof><rights>The Japanese Society of Limnology 2009</rights><rights>The Japanese Society of Limnology 2010</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c463t-bb1772adb67fd0995405a33d58d4a08431b104a4716ea5c3dd9e1bf554dd4e633</citedby><cites>FETCH-LOGICAL-c463t-bb1772adb67fd0995405a33d58d4a08431b104a4716ea5c3dd9e1bf554dd4e633</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10201-009-0299-z$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10201-009-0299-z$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Maki, Koh</creatorcontrib><creatorcontrib>Kim, Chulgoo</creatorcontrib><creatorcontrib>Yoshimizu, Chikage</creatorcontrib><creatorcontrib>Tayasu, Ichiro</creatorcontrib><creatorcontrib>Miyajima, Toshihiro</creatorcontrib><creatorcontrib>Nagata, Toshi</creatorcontrib><title>Autochthonous origin of semi-labile dissolved organic carbon in a large monomictic lake (Lake Biwa): carbon stable isotopic evidence</title><title>Limnology</title><addtitle>Limnology</addtitle><description>Semi-labile dissolved organic carbon (DOC) plays an important role in the transport and hypolimnetic remineralization of carbon in large freshwater lakes. However, sources of semi-labile DOC in lakes remain unclear. This study used a carbon stable isotope approach to examine relative contributions of autochthonous and allochthonous sources to semi-labile DOC. Vertical and seasonal variations in the concentration and carbon stable isotope ratio (δ¹³C) of DOC were determined in large (surface area 674 km²; maximum depth 104 m), monomictic Lake Biwa. A sharp vertical gradient of δ¹³C of DOC (δ¹³C-DOC) during the stratification period [mean ± standard error (SE) −25.5 ± 0.1 and −26.0 ± 0.0‰ in the epi- and hypolimnion, respectively] indicated the accumulation of ¹³C-rich DOC in the epilimnion. Vertical mixing explained the intermediate values of δ¹³C-DOC (−25.7 ± 0.0‰) measured throughout the water column during the overturn period. Both DOC concentration and δ¹³C-DOC decreased in the hypolimnion during stratification, indicating selective remineralization of ¹³C-rich DOC. Using a two-component mixing model, we estimated the δ¹³C value of semi-labile DOC to be −22.2 ± 0.3‰, which was close to the δ¹³C of particulate organic carbon collected in the epilimnion during productive seasons (−22.7 ± 0.7‰) but much higher than the δ¹³C-DOC in river waters (−26.5 ± 0.1‰). Semi-labile DOC appeared to be mainly autochthonous in origin, produced by planktonic communities during productive seasons. The spatiotemporal uncoupling between production and remineralization of semi-labile DOC implies that hypolimnetic oxygen consumption may be affected by pelagic primary production during productive seasons of the preceding year.</description><subject>Autochthony and allochthony</subject><subject>Biomedical and Life Sciences</subject><subject>Carbon</subject><subject>Carbon stable isotope ratio</subject><subject>Dissolved organic carbon</subject><subject>Ecology</subject><subject>Environment</subject><subject>Epilimnion</subject><subject>Freshwater & Marine Ecology</subject><subject>Freshwater lakes</subject><subject>Hypolimnion</subject><subject>Isotopes</subject><subject>Large lake</subject><subject>Life Sciences</subject><subject>Limnology</subject><subject>Mixing model</subject><subject>Oxygen consumption</subject><subject>Particulate organic carbon</subject><subject>Primary production</subject><subject>Ratios</subject><subject>Research Paper</subject><subject>Seasonal variations</subject><subject>Seasons</subject><subject>Semi-labile dissolved organic carbon</subject><subject>Stable isotopes</subject><subject>Water column</subject><subject>Water depth</subject><issn>1439-8621</issn><issn>1439-863X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kUtv1TAQhSMEEqXwA1hhsQEWAU9sxzG7UvGSrsQCKrGzJvYkdUnii51bRNf8cHwVHhILNjMjzXeOZnSq6iHw58C5fpGBNxxqzk3NG2Pqm1vVCUhh6q4Vn2__mRu4W93L-Ypz0C3Ik-rH2WGN7nK9jEs8ZBZTGMPC4sAyzaGesA8TMR9yjtM1-bIfcQmOOUx9XFhBkU2YRmJzMZiDW8tywi_Enu6O9VX4hs9e_sbzin2xCzmucV9Aug6eFkf3qzsDTpke_Oqn1cWb15_O39W7D2_fn5_taidbsdZ9D1o36PtWD54boyRXKIRXnZfIOymgBy5RamgJlRPeG4J-UEp6L6kV4rR6svnuU_x6oLzaOWRH04QLle-tlsoI0wpdyMf_kFfxkJZynFVcGAOm6QoEG-RSzDnRYPcpzJi-W-D2mIrdUrElFXtMxd4UTbNpcmGXkdJf4_-JHm2iAaPFMYVsLz4WRnDolC5_i58GlJpu</recordid><startdate>20100801</startdate><enddate>20100801</enddate><creator>Maki, Koh</creator><creator>Kim, Chulgoo</creator><creator>Yoshimizu, Chikage</creator><creator>Tayasu, Ichiro</creator><creator>Miyajima, Toshihiro</creator><creator>Nagata, Toshi</creator><general>Japan : Springer Japan</general><general>Springer Japan</general><general>Springer Nature B.V</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QH</scope><scope>7SN</scope><scope>7SS</scope><scope>7U9</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H94</scope><scope>H96</scope><scope>HCIFZ</scope><scope>L.G</scope><scope>M2P</scope><scope>M7N</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PYCSY</scope><scope>Q9U</scope></search><sort><creationdate>20100801</creationdate><title>Autochthonous origin of semi-labile dissolved organic carbon in a large monomictic lake (Lake Biwa): carbon stable isotopic evidence</title><author>Maki, Koh ; 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However, sources of semi-labile DOC in lakes remain unclear. This study used a carbon stable isotope approach to examine relative contributions of autochthonous and allochthonous sources to semi-labile DOC. Vertical and seasonal variations in the concentration and carbon stable isotope ratio (δ¹³C) of DOC were determined in large (surface area 674 km²; maximum depth 104 m), monomictic Lake Biwa. A sharp vertical gradient of δ¹³C of DOC (δ¹³C-DOC) during the stratification period [mean ± standard error (SE) −25.5 ± 0.1 and −26.0 ± 0.0‰ in the epi- and hypolimnion, respectively] indicated the accumulation of ¹³C-rich DOC in the epilimnion. Vertical mixing explained the intermediate values of δ¹³C-DOC (−25.7 ± 0.0‰) measured throughout the water column during the overturn period. Both DOC concentration and δ¹³C-DOC decreased in the hypolimnion during stratification, indicating selective remineralization of ¹³C-rich DOC. Using a two-component mixing model, we estimated the δ¹³C value of semi-labile DOC to be −22.2 ± 0.3‰, which was close to the δ¹³C of particulate organic carbon collected in the epilimnion during productive seasons (−22.7 ± 0.7‰) but much higher than the δ¹³C-DOC in river waters (−26.5 ± 0.1‰). Semi-labile DOC appeared to be mainly autochthonous in origin, produced by planktonic communities during productive seasons. The spatiotemporal uncoupling between production and remineralization of semi-labile DOC implies that hypolimnetic oxygen consumption may be affected by pelagic primary production during productive seasons of the preceding year.</abstract><cop>Japan</cop><pub>Japan : Springer Japan</pub><doi>10.1007/s10201-009-0299-z</doi><tpages>11</tpages></addata></record> |
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| subjects | Autochthony and allochthony Biomedical and Life Sciences Carbon Carbon stable isotope ratio Dissolved organic carbon Ecology Environment Epilimnion Freshwater & Marine Ecology Freshwater lakes Hypolimnion Isotopes Large lake Life Sciences Limnology Mixing model Oxygen consumption Particulate organic carbon Primary production Ratios Research Paper Seasonal variations Seasons Semi-labile dissolved organic carbon Stable isotopes Water column Water depth |
| title | Autochthonous origin of semi-labile dissolved organic carbon in a large monomictic lake (Lake Biwa): carbon stable isotopic evidence |
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