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Open AccessArticle

Carbon Transfer from Cyanobacteria to Pelagic and Benthic Consumers in a Subtropical Lake: Evidence from a 13C Labelling Experiment

1
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2
Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510630, China
3
Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing 100190, China
4
Department of Bioscience, Aarhus University, 8600 Silkeborg, Denmark
5
School of Geography, South China Normal University, Guangzhou 510630, China
*
Authors to whom correspondence should be addressed.
Water 2019, 11(8), 1536; https://doi.org/10.3390/w11081536
Received: 6 February 2019 / Revised: 5 July 2019 / Accepted: 20 July 2019 / Published: 25 July 2019
(This article belongs to the Special Issue Trophic Interactions in Warm Freshwater Ecosystems)
Eutrophication of lakes often results in dominance of cyanobacteria, which may potentially lead to serious blooms and toxic water. However, cyanobacterial detritus may act as an important carbon source for aquatic organisms. Using stable isotope carbon (13C) as a tracer, we assessed the carbon transfer from cyanobacteria to pelagic and benthic consumers in a 28-day outdoor mesocosm (~130 L) labelling experiment established in Lake Taihu, China, during a Microcystis aeruginosa bloom. The different organisms were labelled differently after addition of the labelled Microcystis detritus to the water. δ13C of particulate organic matter and of cladoceran zooplankton peaked earlier than for larger invertebrate consumers. Among the pelagic species, Daphnia similis had the highest Δδ13C, while the two snail species Radix swinhoei and Bellamya aeruginosa had lower but similar Δδ13C. The bivalves showed relatively modest changes in δ13C. The δ13C of Anodonta woodiana and Unio douglasiae showed a marginal though not significant increase, while a marked increase occurred for Arconaia lanceolate peaking on day 20, and Corbicula fluminea a slight increase peaking on day 9. Our results suggest that carbon from cyanobacteria can be incorporated by pelagic and some benthic consumers and eventually be transferred to higher trophic levels. Cyanobacterial carbon may, therefore, be considered an important carbon source supporting the entire food web during blooms, even if the cyanobacteria are not consumed directly. View Full-Text
Keywords: stable isotope; subtropical; shallow lake; carbon flow; zooplankton; bivalves stable isotope; subtropical; shallow lake; carbon flow; zooplankton; bivalves
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MDPI and ACS Style

Yu, J.; He, H.; Liu, Z.; Jeppesen, E.; Chen, F.; Zhang, Y. Carbon Transfer from Cyanobacteria to Pelagic and Benthic Consumers in a Subtropical Lake: Evidence from a 13C Labelling Experiment. Water 2019, 11, 1536.

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