Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs

Wang, Baoli; Liu, Cong‐Qiang; Peng, Xi; Wang, Fushun

doi:10.4081/jlimnol.2013.e11

Cited by 33 publications

(29 citation statements)

References 46 publications

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“…in this study (Figure 4), which was indicative of a strong reliance on autochthonous organic matter, as d 13 C of pelagic primary producers usually ranges from À36& to À25& (Vuorio, Meili, & Sarvala, 2006;Wang, Liu, Peng, & Wang, 2013). Our study thus supports the conjecture that aquatic consumers are mainly fuelled by autochthonous primary production (Holgerson, Post, & Skelly, 2016;Lau, Sundh, Vrede, Pickova, & Goedkoop, 2014;Tanentzap et al, 2017).…”

Section: Carbon Processing In Benthic Food Webs and Climate Changesupporting

confidence: 87%

Long‐term effects of climate change on carbon flows through benthic secondary production in small lakes

et al. 2018

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A palaeolimnological study, covering the last c. 12,000 years, was conducted in a small subalpine lake located in the Alps to study climate change impacts on carbon flows through food webs in small lakes. We used analysis of sedimentary pigments and carbon stable isotopic composition of chironomid remains (δ13CHC) to reconstruct past dynamics of phytoplankton community and carbon sources sustaining benthic consumers. Chironomid biomass was sustained by a combination of allochthonous, autochthonous and CH4‐derived organic matters, and their relative contributions were correlated to changes in temperature. Relatively high terrestrial contributions to chironomid biomass were observed during period of the Holocene when in‐lake production was low. Relatively high incorporation of CH4‐derived carbon to chironomid biomass was found during anoxic events co‐occurring with the Holocene thermal maximum. Results were then compared with those collected in a small boreal lake in Estonia. We tested the hypothesis that responses in carbon flows through benthic food web to past climate change would be similar between these lakes. We found a negative correlation between δ13CHC values of both lakes and inferred air temperature, suggesting that temperature was the major driver to different food sources being incorporated into chironomid biomass. Our study demonstrated that air temperature was the principal driver of the energy flows through benthic food web in the studied small lakes. We conjectured that carbon cycling in food webs of small lakes might be strongly sensitive to climate change.

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Section: Carbon Processing In Benthic Food Webs and Climate Changesupporting

confidence: 87%

Long‐term effects of climate change on carbon flows through benthic secondary production in small lakes

et al. 2018

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“…In this context, phytoplankton growing on atmospheric CO 2 and/or a low phytoplankton trophic fractionation could result in phytoplankton δ 13 C values very similar to that of terrestrial organic matter (−25‰ to −15‰; Grey & Jones, ; Meyers & Teranes, ; Vuorio, Meili, & Sarvala, ; Wang, Liu, Peng, & Wang, ), making allochthonous and autochthonous source apportionment difficult to differentiate with only one isotopic tracer. Similar overlaps of the isotopic baseline (between terrestrial and aquatic materials) have been previously described in river ecosystems (Finlay, ; Rasmussen, ).…”

Section: Discussionmentioning

confidence: 99%

Impact of eutrophication on the carbon stable‐isotopic baseline of benthic invertebrates in two deep soft‐water lakes

et al. 2017

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Sedimentary geochemical proxies and carbon stable isotopes of subfossil chironomid head capsules (δ13C) were combined to reconstruct long‐term changes in organic matter sources contributing to chironomid biomass in two soft‐water lakes (Vosges Mountains, France). Here, we test how basal carbon sources fueling the benthic food web responded to two millennia of environmental changes. Sedimentary organic matter characteristics were strongly variable over time, and were mainly influenced by human activities within the watershed basin. During the pre‐eutrophication phase, subfossil chironomid δ13C (δ13CHC) values were lower than those of sedimentary organic matter. These results suggested that chironomid larvae preferentially fed on the autochthonous part of the total sedimentary organic matter. During the modern period, higher accumulation rates of organic matter and a decrease in C/N ratio suggested a steep rise in aquatic productivity for both lakes. As suggested by the synchronous increase in organic matter δ13C values, this higher productivity and the subsequent increase in dissolved CO2 uptake may have induced either a marked increase in atmospheric CO2 uptake by phytoplankton or a reduction in the phytoplankton trophic fractionation. These changes led to overlaps in terrestrial and aquatic carbon stable‐isotopic baselines, hampering the reliable reconstruction of the chironomid palaeo‐diet. These results seem to indicate the minor role of allochthony to sustain aquatic food webs of large and soft‐water lakes, and underscore the necessity to apply an independent compound‐specific stable‐isotope analysis to better estimate the temporal changes in isotopic baseline and, thus, strengthen the reliability of the chironomid palaeo‐diet reconstructions.

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“…13 C values of pelagic primary production usually range from -36 to -25% (Vuorio et al, 2006;Wang et al, 2013), the range of d 13 C HC values could match well with that of the d 13 C values of phytoplankton frequently observed in CO 2 -limiting environment (Street-Perrott et al, 1997;Reuss et al, 2013). Lake Pyramid Inferior is located at 5,067 m a.s.l., and atmospheric pressure is consequently about the half of the value reported at the sea level.…”

Section: High Elevation Partial Pressure and Isotopic Fractionationmentioning

confidence: 58%

Glacier dynamics influenced carbon flows through lake food webs: evidence from a chironomid δ13C-based reconstruction in the Nepalese Himalayas

2018

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Using a sediment core covering the last 3,500 years, we analysed photosynthetic pigments' concentrations in lake sediments and carbon stable isotopic composition of chironomid (Diptera, Chironomidae) remains (d 13 C HC ). We aimed to reconstruct temporal changes in aquatic primary productivity and carbon resources sustaining chironomid larvae in a high mountain lake (Lake Pyramid Inferior; 5,067 m a.s.l.) located in the Nepalese Himalayas. Both pigments and d 13 C HC trends followed a similar fluctuating pattern over time, and we found significant positive relationships between these proxies, suggesting the strong reliance of benthic consumers on the aquatic primary production. Temporal trends matched well with main known climatic phases in the Eastern part of the Himalayan Mountains. Past glacier dynamics and associated in-lake solute concentrations appeared to be the main driver of autochthonous primary productivity, suggesting then the indirect impact of climate change on carbon processing in the benthic food web. During warm periods, the glacier retreat induced a rise in in-lake solute concentrations leading to an increasing primary productivity. Complementary investigations are still needed to strengthen our understanding about the response of past aquatic carbon cycling in CO 2 -limiting environments.

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Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs

Abstract: In

Cited by 33 publications

References 46 publications

Long‐term effects of climate change on carbon flows through benthic secondary production in small lakes

Long‐term effects of climate change on carbon flows through benthic secondary production in small lakes

Impact of eutrophication on the carbon stable‐isotopic baseline of benthic invertebrates in two deep soft‐water lakes

Glacier dynamics influenced carbon flows through lake food webs: evidence from a chironomid δ13C-based reconstruction in the Nepalese Himalayas

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