Local environment overrides regional climate influence on regime shift in a north temperate lake

Zhang, Min; Xu, Jun; Hansson, Lars‐Anders

doi:10.1007/s10452-015-9509-4

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…In early summer, phagotrophic nutrient acquisition might have helped in becoming the dominant phytoplankton community member, but Cryptomonas reached its highest absolute abundances during the most eutrophic conditions in fall. Both the high total phosphorus concentrations during this time and the occurrence of cyanobacterial blooms are in line with earlier reports from Lake Krankesj€ on (Hargeby et al 2007;Zhang et al 2015) and represent a temporal pattern more frequently observed in shallow lakes (Søndergaard et al 2002), but are not typically considered favorable conditions for mixotrophs. Nevertheless, Cryptomonas also showed relatively higher importance in more eutrophic lakes in South America (Saad et al 2016) indicating that nutrient limitation is not necessarily the major driver for phagotrophy in this species.…”

Section: Environmental Drivers and Seasonal Dynamicssupporting

confidence: 91%

Primary producers or consumers? Increasing phytoplankton bacterivory along a gradient of lake warming and browning

Wilken

Soares

Urrutia‐Cordero

et al. 2017

Limnology & Oceanography

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Eukaryotic phytoplankton form the basis of aquatic food webs and play a key role in the global carbon cycle. Many of these evolutionarily diverse microalgae are also capable of feeding on other microbes, and hence simultaneously act both as primary producers and consumers. The net ecosystem impact of such mixotrophs depends on their nutritional strategy which is likely to alter with environmental change. Many temperate lakes are currently warming at unprecedented rates and are simultaneously increasing in water color (browning) due to increased run‐off of humic substances. We hypothesized that the resulting reduction in light intensity and increased bacterial abundances would favor mixotrophic phytoplankton over obligate autotrophs, while higher temperatures might boost their rates of bacterivory. We tested these hypotheses in a mesocosm experiment simulating a gradient of increasing temperature and water color in temperate shallow lakes as expected to occur over the coming century. Mixotrophs showed a faster increase in abundance under the climate change scenario during spring, when they dominated the phytoplankton community. Furthermore, both bacterial abundances and rates of phytoplankton bacterivory increased under future climate conditions. Bacterivory contributed significantly to phytoplankton resource acquisition under future climate conditions, while remaining negligible throughout most of the season in treatments resembling today's conditions. Hence, to our knowledge, we here provide the first evidence for an increasing importance of bacterivory by phytoplankton in future temperate shallow lakes. Such a change in phytoplankton nutritional strategies will likely impact biogeochemical cycles and highlights the need to conceptually integrate mixotrophy into current ecosystem models.

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Section: Environmental Drivers and Seasonal Dynamicssupporting

confidence: 91%

Primary producers or consumers? Increasing phytoplankton bacterivory along a gradient of lake warming and browning

Wilken

Soares

Urrutia‐Cordero

et al. 2017

Limnology & Oceanography

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“…In terms of alternative temperature effect, warmer surface waters may actually stimulate herbivory (Berger et al 2010;Boersma et al 2016), suggesting strengthening top-down control of phytoplankton biomass by zooplankton. In Swedish lakes, phytoplankton biomass was more strongly controlled by grazing rates and nutrient availability than by any direct temperature effect (Zhang, Xu, and Hansson 2015). Further, zooplankton grazing suppresses phytoplankton biomass near surface waters but may promote increased autotrophic biomass in deeper mixed layers (Pannard, Planas, and Beisner 2015).…”

Section: Introductionmentioning

confidence: 97%

“…Typically, cyanobacteria thrive in warmer, more nutrient-rich lakes with shallow mixing depths (Hamilton, Salmaso, and Paerl 2016). Nevertheless, studies have also noted that cyanobacteria may dominate in more nutrient-poor systems with high levels of zooplankton grazing (Zhang, Xu, and Hansson 2015) or in warmer, deeper mixed layers under lightlimiting conditions (Kovacs, Presing, and Voros 2016). Significant increases in the biomass of chlorophytes, dinoflagellates, diatoms, chrysophytes, and cryptophytes occurred due to experimental deepening of the mixed layer in a Canadian lake (Cantin et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Changes in mixing depth reduce phytoplankton biomass in an Arctic lake: Results from a whole-lake experiment

Northington

Saros

Burpee

et al. 2019

Arctic, Antarctic, and Alpine Research

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Research has revealed contradictory responses of primary producers in Arctic lakes to increasing temperatures, making it unclear how future warming and climate change will alter lake productivity. We conducted a whole-lake manipulation to examine the effect of altered thermal structure on phytoplankton biomass in a lake in Greenland, one of the most rapidly warming regions of the world. Deepened lake mixing (from 4 to 8 m) in the experimental lake led to significant declines in phytoplankton biomass in the sediment traps despite warmer surface waters, indicating that changes in mixing depth may negate a positive, direct effect of warming on primary producer biomass. Light limitation (induced by deeper mixing) of phytoplankton played a greater role than temperature in structuring these Arctic lake phytoplankton communities. To put the manipulation in context, we surveyed twenty-four lakes across western Greenland to determine the strongest regional predictors of phytoplankton density. Across the landscape, lake chemistry and light attenuation in the epilimnion were the most important predictors of algal assemblages in the survey lakes. Though temperature can directly influence lake ecosystems, multiple factors will affect mixing depths of Arctic lakes, potentially leading to variable effects of warming on phytoplankton biomass and community structure.

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“…Temperature was thus a significant environmental factor affecting the diversity, community structure and function of bacterioplankton, and it might be also a factor that promoted regime shifts of bacterioplankton community in water bodies. There may be an early warning temperature that serves as an indicator for steady state transformation ( Zhang et al, 2015 ; Anderson et al, 2018 ; Rosero-López et al, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

An abrupt regime shift of bacterioplankton community from weak to strong thermal pollution in a subtropical bay

Shan,

Chen,

Deng

et al. 2024

Front. Microbiol.

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Thermal pollution from the cooling system of the nuclear power plants greatly changes the environmental and the ecological conditions of the receiving marine water body, but we know little about their impact on the steady-state transition of marine bacterioplankton communities. In this study, we used high-throughput sequencing based on the 16S rRNA gene to investigate the impact of the thermal pollution on the bacterioplankton communities in a subtropical bay (the Daya Bay). We observed that thermal pollution from the cooling system of the nuclear power plant caused a pronounced thermal gradient ranging from 19.6°C to 24.12°C over the whole Daya Bay. A temperature difference of 4.5°C between the northern and southern parts of the bay led to a regime shift in the bacterioplankton community structure. In the three typical scenarios of regime shifts, the steady-state transition of bacterioplankton community structure in response to temperature increasing was more likely consistent with an abrupt regime shift rather than a smooth regime or a discontinuous regime model. Water temperature was a decisive factor on the regime shift of bacterioplankton community structure. High temperature significantly decreased bacterioplankton diversity and shifted its community compositions. Cyanobium and Synechococcus of Cyanobacteria, NS5 marine group of Bacteroidota, and Vibrio of Gammaproteobacteria were found that favored high temperature environments. Furthermore, the increased water temperature significantly altered the community assembly of bacterioplankton in Daya Bay, with a substantial decrease in the proportion of drift and others, and a marked increase in the proportion of homogeneous selection. In summary, we proposed that seawater temperature increasing induced by the thermal pollution resulted in an abrupt regime shift of bacterioplankton community in winter subtropical bay. Our research might broad our understanding of marine microbial ecology under future conditions of global warming.

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Local environment overrides regional climate influence on regime shift in a north temperate lake

Cited by 6 publications

References 38 publications

Primary producers or consumers? Increasing phytoplankton bacterivory along a gradient of lake warming and browning

Primary producers or consumers? Increasing phytoplankton bacterivory along a gradient of lake warming and browning

Changes in mixing depth reduce phytoplankton biomass in an Arctic lake: Results from a whole-lake experiment

An abrupt regime shift of bacterioplankton community from weak to strong thermal pollution in a subtropical bay

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