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  1. Article ; Online: Effects of microbial-converted ancient permafrost organic carbon on the growth and reproduction of Daphnia magna.

    Gan, Yingxin / Su, Yaling / Ma, Jingjing

    Oecologia

    2023  Volume 203, Issue 3-4, Page(s) 335–348

    Abstract: Immense amounts of ancient (radiocarbon age over 200 years) organic carbon (OC) from permafrost are released into aquatic systems. Ancient terrestrial OC exists in numerous aquatic ecosystems. It has been reported that ancient OC can be incorporated by ... ...

    Abstract Immense amounts of ancient (radiocarbon age over 200 years) organic carbon (OC) from permafrost are released into aquatic systems. Ancient terrestrial OC exists in numerous aquatic ecosystems. It has been reported that ancient OC can be incorporated by consumers in aquatic ecosystems, but the effect of ancient OC on the growth of consumers has rarely been studied. In this study, we extracted ancient dissolved organic carbon (DOC) from frozen soils in an alpine lake catchment. After a 6-day microbial conversion period, the contents of ω3 and ω6 polyunsaturated fatty acids (PUFAs) in ancient DOC increased. Proteobacteria and Actinobacteria were the primary taxa consuming the permafrost DOC and generating fatty acids. In addition to the exclusive diet of soil DOC (containing bacteria) or Chlorella pyrenoidosa, mixed diets of Chlorella pyrenoidosa, and ancient DOC (containing bacteria) in ratios of 2:1, 1:1, and 1:2 (by carbon concentration) were used to feed Daphnia magna. We discovered that Daphnia reared on the mixture with the DOC:Chlorella ratio of 1:2 had the highest contents of ω3 PUFAs and FAs. Daphnia reared exclusively on Chlorella and the mixture with the DOC:Chlorella ratio of 1:2 had the largest body size (3.1-3.4 mm) and the highest offspring production (95.5-96.2 ind
    MeSH term(s) Animals ; Permafrost ; Ecosystem ; Daphnia ; Carbon ; Chlorella ; Reproduction ; Soil
    Chemical Substances Carbon (7440-44-0) ; Soil
    Language English
    Publishing date 2023-10-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 123369-5
    ISSN 1432-1939 ; 0029-8549
    ISSN (online) 1432-1939
    ISSN 0029-8549
    DOI 10.1007/s00442-023-05467-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Does ancient permafrost-derived organic carbon affect lake zooplankton growth? An experimental study on Daphnia magna.

    Su, Yaling / Gan, Yingxin / Shi, Limei / Li, Kuanyi / Liu, Zhengwen

    Environmental pollution (Barking, Essex : 1987)

    2022  Volume 300, Page(s) 118968

    Abstract: The popular paradigm in trophic dynamic theory is that contemporary autochthonous organic matter (e.g., phytoplankton) sustains consumer growth, whereas aged allochthonous organic matter is conceptually considered recalcitrant resources that may only be ... ...

    Abstract The popular paradigm in trophic dynamic theory is that contemporary autochthonous organic matter (e.g., phytoplankton) sustains consumer growth, whereas aged allochthonous organic matter is conceptually considered recalcitrant resources that may only be used to support consumer respiration but suppress consumer growth. This resource-age paradigm has been challenged by a growing body of recent evidence that ancient (radiocarbon depleted) organic carbon (OC) released from glaciers and permafrost can be incorporated by consumers in aquatic systems. However, little information is available regarding the food quality of ancient terrestrial OC and how it impacts the growth of consumers in lakes. Here, ancient dissolved organic carbon (DOC) was extracted from frozen soils in an alpine lake catchment. The contents of polyunsaturated fatty acids (PUFAs) in soil DOC increased significantly after bioconversion by heterotrophic bacteria. The utilization of soil DOC by heterotrophic bacteria also increased the total phosphorus concentration in the systems. Gammaproteobacteria and Betaproteobacteria showed a strong negative correlation with the percentage contents of fluorescent components, including humic-like and tyrosine-like components. Daphnia magna were fed Auxenochlorella vulgaris and ancient DOC plus heterotrophic bacteria. The contents of PUFAs and the growth of zooplankton were influenced by the pre-conversion time of ancient DOC by bacteria. When ancient DOC was pre-converted by bacteria for 27 days, D. magna fed on the mixed diets showed the highest body length (3.40 mm) and intrinsic rate of increase in population (0.49 d
    MeSH term(s) Animals ; Carbon ; Daphnia ; Lakes ; Permafrost ; Zooplankton
    Chemical Substances Carbon (7440-44-0)
    Language English
    Publishing date 2022-02-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 280652-6
    ISSN 1873-6424 ; 0013-9327 ; 0269-7491
    ISSN (online) 1873-6424
    ISSN 0013-9327 ; 0269-7491
    DOI 10.1016/j.envpol.2022.118968
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  3. Article: Does ancient permafrost-derived organic carbon affect lake zooplankton growth? An experimental study on Daphnia magna

    Su, Yaling / Gan, Yingxin / Shi, Limei / Li, Kuanyi / Liu, Zhengwen

    Environmental pollution. 2022 May 01, v. 300

    2022  

    Abstract: The popular paradigm in trophic dynamic theory is that contemporary autochthonous organic matter (e.g., phytoplankton) sustains consumer growth, whereas aged allochthonous organic matter is conceptually considered recalcitrant resources that may only be ... ...

    Abstract The popular paradigm in trophic dynamic theory is that contemporary autochthonous organic matter (e.g., phytoplankton) sustains consumer growth, whereas aged allochthonous organic matter is conceptually considered recalcitrant resources that may only be used to support consumer respiration but suppress consumer growth. This resource-age paradigm has been challenged by a growing body of recent evidence that ancient (radiocarbon depleted) organic carbon (OC) released from glaciers and permafrost can be incorporated by consumers in aquatic systems. However, little information is available regarding the food quality of ancient terrestrial OC and how it impacts the growth of consumers in lakes. Here, ancient dissolved organic carbon (DOC) was extracted from frozen soils in an alpine lake catchment. The contents of polyunsaturated fatty acids (PUFAs) in soil DOC increased significantly after bioconversion by heterotrophic bacteria. The utilization of soil DOC by heterotrophic bacteria also increased the total phosphorus concentration in the systems. Gammaproteobacteria and Betaproteobacteria showed a strong negative correlation with the percentage contents of fluorescent components, including humic-like and tyrosine-like components. Daphnia magna were fed Auxenochlorella vulgaris and ancient DOC plus heterotrophic bacteria. The contents of PUFAs and the growth of zooplankton were influenced by the pre-conversion time of ancient DOC by bacteria. When ancient DOC was pre-converted by bacteria for 27 days, D. magna fed on the mixed diets showed the highest body length (3.40 mm) and intrinsic rate of increase in population (0.49 d⁻¹). Our findings provide direct evidence that ancient terrestrial OC can be an important subsidy for lake secondary production, which have important implications for food webs in high-altitude and polar lakes.
    Keywords Auxenochlorella ; Daphnia magna ; altitude ; beta-Proteobacteria ; biotransformation ; body length ; carbon radioisotopes ; dissolved organic carbon ; fluorescence ; food quality ; gamma-Proteobacteria ; lakes ; permafrost ; phytoplankton ; pollution ; total phosphorus ; watersheds ; zooplankton
    Language English
    Dates of publication 2022-0501
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 280652-6
    ISSN 1873-6424 ; 0013-9327 ; 0269-7491
    ISSN (online) 1873-6424
    ISSN 0013-9327 ; 0269-7491
    DOI 10.1016/j.envpol.2022.118968
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  4. Article: Effects of ancient allochthonous and contemporary autochthonous organic carbon on the growth and reproduction of lake zooplankton

    Zhao, Zifan / Gan, Yingxin / He, Hu / Zhou, Libin / Li, Kuanyi / Liu, Zhengwen / Wu, Qinglong / Su, Yaling

    Freshwater biology. 2022 May, v. 67, no. 5

    2022  

    Abstract: Carbon with a radiocarbon age above 200 years before present (bp) generally is referred to as ancient carbon. Ancient organic carbon (OC) stored in glaciers, permafrost and unperturbed soil has been released with increasing temperatures resulting from ... ...

    Abstract Carbon with a radiocarbon age above 200 years before present (bp) generally is referred to as ancient carbon. Ancient organic carbon (OC) stored in glaciers, permafrost and unperturbed soil has been released with increasing temperatures resulting from climate warming and anthropogenic activities. Evidence suggests that ancient terrestrial OC can be incorporated by heterotrophic bacteria and consumers in many aquatic systems. However, it remains unknown whether ancient terrestrial OC promotes growth and reproduction of consumers. Ancient dissolved organic carbon (DOC) was extracted from frozen soils in the catchments of Lakes Tsochuolong (−216.9‰, 1,960 years bp) and Zhangnaitso (−384.1‰, 3,895 years bp) on the Tibetan Plateau, and was further degraded by heterotrophic bacteria. Degraded ancient DOC (containing bacteria) and Auxenochlorella (−161.6‰) were used exclusively or in combination as food (total 6 mg C/L) for Daphnia magna (D. magna) to compare their body length, mortality rate and offspring production. The mixed diets consisted of ancient DOC converted by bacteria at 4 mg C/L and Auxenochlorella at 2 mg C/L. The radiocarbon isotope (∆¹⁴C) value of D. magna fed on mixed diets was −293.0‰ for Lake Tsochuolong (group CA) and −265.9‰ for Lake Zhangnaitso (group CB), which was depleted than those fed exclusively on Auxenochlorella (−187.3‰, group 6C). This result suggests that ¹⁴C‐depleted DOC can be assimilated by zooplankton. Daphnia magna in group CB had the highest intrinsic rate of population increase (0.33/day) and number of neonates per individual (15.97/ind). The higher growth rate and offspring production in group CB than in CA (0.21/day and 7.68/ind) probably were because D. magna utilised more Auxenochlorella and phosphorus from diets in CB. However, there was no significant difference in the two indicators between CA and 6C (0.24/day and 12.30/ind) or between CB and 6C. Daphnia magna fed exclusively on degraded DOC plus bacteria had the lowest growth rate and offspring production. The results demonstrate that in the presence of algae with high nutritional value, degraded ancient DOC could support the growth and reproduction of zooplankton. Our findings extend the understanding of carbon sources and carbon cycling in food webs in lakes, particularly in high‐altitude and polar lakes in the context of climatic and environmental changes.
    Keywords Auxenochlorella ; Daphnia magna ; altitude ; body length ; carbon radioisotopes ; climate ; dissolved organic carbon ; lakes ; limnology ; mortality ; nutritive value ; permafrost ; phosphorus ; population growth ; progeny ; reproduction ; zooplankton ; China
    Language English
    Dates of publication 2022-05
    Size p. 873-882.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 121180-8
    ISSN 0046-5070
    ISSN 0046-5070
    DOI 10.1111/fwb.13887
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