Sedimentary records of chironomids and pigments from Poyang Lake (middle Yangtze floodplain, China)


The sedimentary chironomids and pigments in two Yangtze floodplain (China) lake sediment cores since 1800s CE. The sediment cores were dated using lead-210 with the constant rate of supply (CRS) model. Chironomids were ananlyzed following standard procedures. About 10 g wet samples were firstly deflocculated using 10% potassium hydroxide (KOH) in a 75 °C water bath for about 15 minutes. Then, sediments were gently washed through 212 μm and 90 μm sieves with water after which the residues on the sieves were backwashed into a sorting tray. Chironomid head capsules were picked out individually using fine forceps under a dissecting microscope. The chironomid head capsules were identified using a microscope at ×100/×400 magnification. At least 50 head capsules were picked out from each sample to make the results and interpretations statistically robust.

The sediment cores were dated using lead-210. Chironomid samples were prepared and analysed following the methods presented in Brooks et al., (2007). Sedimentary pigments (including canthaxanthin and UVR index) were analyzed using a high performance liquid chromatography (HPLC). The concentration of canthaxanthin was calibrated using total organic carbon. The UVR index calculated by dividing the concentration of UVR-absorbing pigments relative to the sum of alloxanthin, diatoxanthin and lutein-zeaxanthin and multiplying by 100.Elements (TP, Zn and Al) were analyzed using an inductively coupled plasma-atomic emission spectrometry (ICP-AES) after digesting with a mixture of acid (HF:HCl:HNO3:HClO4, 3:0.5:6:0.5, v/v).

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Metadata Access
Creator Zeng, Linghan ORCID logo; Engels, Stefan ORCID logo; Swann, George E A ORCID logo; Chen, Xu; Huang, Xianyu ORCID logo; Cao, Yanmin; McGowan, Suzanne
Publisher PANGAEA
Publication Year 2024
Funding Reference National Natural Science Foundation of China Crossref Funder ID 42201173 ; National Natural Science Foundation of China Crossref Funder ID 42271165 ; National Natural Science Foundation of China Crossref Funder ID U20A2094
Rights Creative Commons Attribution-ShareAlike 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints);
OpenAccess false
Resource Type Dataset
Format text/tab-separated-values
Size 957 data points
Discipline Earth System Research
Spatial Coverage (116.078 LON, 29.169 LAT)