Spatial and seasonal variations in the stable C isotope composition of dissolved inorganic carbon and in physico-chemical water parameters in the Plitvice Lakes system

Barešić, Jadranka; Horvatinčić, Nada; Roller-Lutz, Zvjezdana

doi:10.1080/10256016.2011.596625

Cited by 25 publications

(22 citation statements)

References 21 publications

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“…Lower DIC concentrations in the lake center and outflow during summer (Table 1; Fig. 4a) might be the result of precipitation of carbonates as well as uptake of CO 2 or even HCO { 3 by photosynthetic organisms (Barešić et al 2011). For example, cyanobacteria that prevail in Lake Võ rtsjä rv in summer possess an environmental adaptation known as a CO 2 -concentrating mechanism that evolved to improve photosynthetic performance, particularly under CO 2 -limiting conditions (Price 2011).…”

Section: Discussionmentioning

confidence: 99%

Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment

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et al. 2013

Limnology & Oceanography

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We traced the origin of dissolved organic matter (DOM) in the large, shallow, eutrophic Lake Võ rtsjärv in Estonia. Allochthonous DOM (Al-DOM) had higher d 13 C values than autochthonous DOM (Au-DOM). The d 13 C of inflow DOM varied from 228.2% to 225.4% (mean 226.7%) and in-lake DOM varied from 228.4% to 226.1% (mean 227.2%). Low stable isotope (SI) signatures of Au-DOM were caused by relatively 13 C-depleted values of its precursors (mainly phytoplankton) with mean d 13 C of 228.9%. SI signatures of dissolved inorganic carbon (DIC) in the inflows and in the lake were also relatively low (from 215.1% to 23.28%). SI values of DOM were lower during the active growing season from May to September and higher from October to April, with the corresponding estimated average proportions of Al-DOM 68% and 81%. The proportion of Al-DOM decreased with increasing water temperature, chlorophyll a, and pH and increased with increasing water level and concentration of yellow substances and DIC. The high proportion of Al-DOM in Võ rtsjä rv shows that, even in this highly productive ecosystem, the labile Au-DOM produced is rapidly utilized and degraded by microorganisms and thus makes a relatively small contribution to the instantaneous in-lake DOM pool.

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Section: Discussionmentioning

confidence: 99%

Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment

Toming

Tuvikene

Vilbaste

et al. 2013

Limnology & Oceanography

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“…The exchange with the atmospheric CO 2 was also confirmed by the δ 13 C values of carbonate fractions: higher δ 13 C values of Lake Kozjak sediment, mean δ 13 C (−9 0 ± 0 4) , compared with the Lake Prošće δ 13 C (-9 7 ± 0 5) ( Table 1). δ 13 C values of DIC in Prošće and Kozjak Lake in the site of sampling were (−11 2 ± 1 2) and (−10 88 ± 0 64) , respectively [8]. The photosynthetic activity of aquatic plants could also influence the 14 C increase of DIC and carbonate fraction in downstream flow.…”

Section: Resultsmentioning

confidence: 99%

“…This was the result of the carbon origin and/or processes involved in sediment formations. The 14 C and δ 13 C values of carbonate fraction were the results of the geochemical processes occurred mainly in the karst spring/aquifier area [8,16]. Significantly higher 14 C of organic fraction for both lake sediments and δ 13 C values of −34 to −30 showed that the organic fraction was mainly composed of aquatic plants and influenced by bioproductivity of the lake waters.…”

Section: Resultsmentioning

confidence: 99%

“…Lake Prošće is the uppermost lake in the Plitvice Lakes system, while the Lake Kozjak is ∼5 km distant in downstream direction, with several lakes and numerous waterfalls in between (Figure 1). In this turbulent water flow the CO 2 degassing from the water and carbon isotope exchange processes between DIC in water and atmospheric CO 2 affected the increase of 14 C of DIC and as a consequence an increase of 14 C of lake carbonate [8].…”

Section: Resultsmentioning

confidence: 99%

“…Stable isotope ratios of 13 C/ 12 C in carbonate (δ 13 C values) depend on the carbon isotope composition of dissolved inorganic carbon (DIC) in water and the conditions under which the precipitation occurs [8]. Organic fraction in the karst lake sediments is much less abundant, only by a few percent in the Plitvice Lakes [9] but its δ 13 C values give an additional information about the processes of bioactivity and productivity in the lake waters [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Isotope analyses of the lake sediments in the Plitvice Lakes, Croatia

et al. 2014

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Abstract:The analyses of radioactive isotopes 14 C, 137 Cs and 210 Pb, and stable isotope 13 C were performed in the sediment cores, top 40 cm, taken in 2011 from karst lakes Prošće and Kozjak in the Plitvice Lakes National Park, central Croatia. Frozen sediment cores were cut into 1 cm thick layers and dried. 14 C activity in both carbonate and organic fractions was measured using accelerator mass spectrometry technique with graphite synthesis. 137 Cs, 210 Pb, 214 Pb and 214 Bi were measured by low level gamma spectrometry method on ORTECHPGe detector with the efficiency of 32%. Distribution of 14 C activity from both lakes showed increase of the 14 C activity in the top 10 − 12 cm in both carbonate and organic fractions as a response to thermonuclear bomb-produced 14 C in the atmosphere in the sixties of the 20th century. Anthropogenically produced 137 Cs was also observed in sediment profiles. Sedimentation rates for both lake sediments were estimated based on the unsupported 210 Pb activity. Different 14 C activity of the carbonate fraction (63−80 pMC, percent of modern carbon) and organic fraction (82 − 93 pMC) is the result of geochemical and biological processes of the sediment precipitation in the lake waters. This is also confirmed by the δ 13 C values of both fractions. Carbon isotope composition, 14 C and δ 13 C , was compared with the lake sediments from the same lakes collected in 1989 and 2003. 29.30 Kv, 91.65.Dt, 91.67.Qr, 91.67.Rx, 92.20.Td, 92.20.Xy PACS (2008):

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