Phytoplankton response to climate changes and anthropogenic activities recorded by sedimentary pigments in a shallow eutrophied lake

Zhang, Hanxiao; Huo, Shouliang; Yeager, Kevin M.; He, Zhuoshi; Xi, Beidou; Li, Xiaochuang; Ma, Chunzi; Wu, Fengchang

doi:10.1016/j.scitotenv.2018.08.081

Cited by 33 publications

(13 citation statements)

References 40 publications

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“…Similar to other shallow lakes with rapid sedimentation and burial rates (Zastepa et al 2017; Zhang et al 2019), our fossil pigment records in Taihu Lake suggest limited degradation issues (Supporting Information Fig. S5) (Cuddington and Leavitt 1999), and can be used to accurately track past primary productivity and algal succession.…”

Section: Resultssupporting

confidence: 75%

“…Sedimentary pigments show that there has been an overall increase in algal production over the past ~100 yr, but distinct timings and processes of community dynamics in contrasting Taihu Lake zones. In Meiliang Bay, algal production started to increase ~1950 and accelerated after 1980, with particularly substantial increases in cyanobacteria and cryptophytes, as observed in other studies of long‐term lake eutrophication (McGowan et al 2012; Zhang et al 2019). In contrast, primary production showed abrupt increases between 1995 and 2005 in Eastern Taihu Lake, and alternating phototrophic assemblages where macrophytes, chlorophytes, and cyanobacteria (during 1960–1990) or cryptophytes and siliceous algae (after 1990) assumed greater importance.…”

Section: Discussionsupporting

confidence: 66%

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Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Zhang

McGowan

et al. 2021

Limnology & Oceanography

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Anthropogenic and climatic stressors on freshwater ecosystems are of global concern. However, the interactions and effects of multiple stressors (e.g., nutrient enrichment, climate warming, altered wind and precipitation) acting over different spatial and temporal scales are often complex and remain controversial. Here, we reconstructed one‐century dynamics of eutrophication and primary producer communities in algal‐dominated and macrophyte‐dominated zones of a large shallow lake (Taihu, China), by integrating sedimentary photosynthetic pigments and geochemical records with water monitoring and historical archives. We aimed to explore the long‐term underlying mechanisms of the responses of water quality and lake biota to multiple environmental perturbations. We found that water quality degradation and algal community modification showed similar trends but distinct timings and trajectories in contrasting ecological zones. Onset and intensity of eutrophication in north Meiliang Bay (since the 1950s) exceeded far beyond that of macrophyte‐dominated Eastern Taihu (~1990s). Anthropogenic nutrients overtook past climatic control on production and composition of phototrophic assemblages. More importantly, lake phytoplankton responded markedly to climate warming, decreasing wind speed, and extreme weathers after cultural eutrophication. Synergistic interactions of nutrients and climate on lake ecosystems became increasingly significant in promoting harmful algal blooms (HABs) dominated by Microcystis, close to the hyper‐eutrophic north lake zones. The asynchronous limnological and ecological responses also indicated the modulating roles of lake ecological regime and catchment hydrogeomorphic characteristic. Collectively, our findings suggest that mitigation of eutrophication and HABs calls for a triple management strategy integrating anthropogenic nutrients, climate change, and lake‐catchment setting.

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Section: Resultssupporting

confidence: 75%

Section: Discussionsupporting

confidence: 66%

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Zhang

McGowan

et al. 2021

Limnology & Oceanography

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“…The SARs of each lake were used to reconstruct temporal trends in the trophic states and cyanobacterial communities represented by the sediment cores. The determination of other paleo-physicochemical and biological parameters including total nitrogen (TN), total phosphorus (TP), total organic carbon (TOC), carbon stable isotope fractionations (δ 13 C org ), fossil diatom assemblages, and pigment compositions are described in our previous studies. , The aforementioned paleo-physicochemical and biological variables, including their vertical profiles, are described in greater detail in the Supporting Information (Figures S3 and S4).…”

Section: Materials and Methodsmentioning

confidence: 99%

Climate and Nutrient-Driven Regime Shifts of Cyanobacterial Communities in Low-Latitude Plateau Lakes

Zhang

Huo

Xiao

et al. 2021

Environ. Sci. Technol.

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Cyanobacterial blooms that form in response to climate warming and nutrient enrichment in freshwater lakes have become a global environmental challenge. Historical legacy effects and the mechanisms underlying cyanobacterial community succession are not well understood, especially for plateau lakes that are important global freshwater resources. This study investigated the temporal dynamics of cyanobacterial communities over centuries in response to nutrient enrichment and climate warming in low-latitude plateau lakes using high-throughput DNA sequencing of sedimentary DNA combined with traditional paleolimnological analyses. Our results confirmed that nutrients and climate warming drive shifts in cyanobacterial communities over time. Cyanobacterial community turnover was pronounced with regime shifts toward new ecological states, occurring after exceeding a tipping point of aquatic total phosphorus (TP). The inferred species interactions, niche differentiation, and identity of keystone taxa significantly changed after crossing the aquatic TP ecological threshold, as demonstrated by network analysis of cyanobacterial taxa. Further, the contribution of aquatic TP to cyanobacterial community dynamics was greater than that of air temperature when lakes were in an oligotrophic state. In contrast, as the aquatic TP threshold was exceeded, the contribution to community dynamics by air temperature increased and potentially surpassed that of aquatic TP. Overall, these results provide new evidence for how past nutrient levels in lacustrine ecosystems influence contemporary cyanobacterial community responses to global warming in low-latitude plateau lakes.

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“…2016, Zhang et al. 2019) supports the tentative identification of these pigments. Hence, D+D were summarized, and all four pigments included in the following analysis.…”

Section: Resultsmentioning

confidence: 74%

“…2016, Zhang et al. 2019). However, the compositions being deposited in the sediment also depend on the pigment stability and preservation conditions.…”

mentioning

confidence: 99%

Algal Community Change in Mountain Lakes of the Alps Reveals Effects of Climate Warming and Shifting Treelines¹

Kuefner

Hofmann

Geist

et al. 2021

Journal of Phycology

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The biological communities of mountain lakes are suspected to be highly sensitive to global warming and associated catchment changes. To identify the parameters determining algal community responses, subfossil pigments from 21 different mountain lakes in the Bavarian‐Tyrolean Limestone Alps were investigated. Sediment cores were radio‐isotopically dated, and their pigment preservation evaluated. General additive models (GAM) of pigment compositions were calculated with temperature as the explanatory variable and generalized linear models with several lake parameters explaining log‐transformed GAM P‐values. Lake depth and trophic state were identified as major control variables of the algal community and productivity changes. Shifts in a deep oligotrophic alpine lake (lg(P) = −1.04) were half as strong as in a shallow mesotrophic alpine lake (lg(P) = −1.86) with faster warming and higher productivity forcing the development of biomass. Phytoplankton and macrophyte pigments increased clearly with warming, at lower altitudes, and decreased at the treeline, so that periphytic pigments dominated alpine sediments. This pattern is probably the result of interactions of UV radiation and allochthonous inputs of DOM. Our findings suggest that (sub)alpine shallow lakes with higher nutrient levels are most vulnerable to climate change‐driven changes whereas deep, nutrient‐poor lakes appear more resilient.

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Phytoplankton response to climate changes and anthropogenic activities recorded by sedimentary pigments in a shallow eutrophied lake

Cited by 33 publications

References 40 publications

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Climate and Nutrient-Driven Regime Shifts of Cyanobacterial Communities in Low-Latitude Plateau Lakes

Algal Community Change in Mountain Lakes of the Alps Reveals Effects of Climate Warming and Shifting Treelines¹

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Phytoplankton response to climate changes and anthropogenic activities recorded by sedimentary pigments in a shallow eutrophied lake

Cited by 33 publications

References 40 publications

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Synergistic impacts of nutrient enrichment and climate change on long‐term water quality and ecological dynamics in contrasting shallow‐lake zones

Climate and Nutrient-Driven Regime Shifts of Cyanobacterial Communities in Low-Latitude Plateau Lakes

Algal Community Change in Mountain Lakes of the Alps Reveals Effects of Climate Warming and Shifting Treelines1

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Algal Community Change in Mountain Lakes of the Alps Reveals Effects of Climate Warming and Shifting Treelines¹