Lowered nutritional quality of plankton caused by global environmental changes

Lau, Danny C. P.; Jönsson, Anders; Isles, Peter D. F.; Creed, Irena F.; Bergström, Ann‐Kristin

doi:10.1111/gcb.15887

Cited by 33 publications

(49 citation statements)

References 58 publications

(164 reference statements)

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“…Our results are in line with previous studies that showed the association of lower seston nutritional quality with increased cyanobacteria dominance in seston (Senar et al 2019;Schmidt et al 2020). The relative concentrations of DHA, EPA, and overall PUFA of seston in our study were lower than those of seston in northern lakes with DOC concentrations ranging from 2-10 mg•L À1 (Strandberg et al 2015;Lau et al 2021). The seston composition of the boreal lakes reported in Strandberg et al (2015) largely consisted of PUFA-rich cryptophytes and diatoms and to a modest extent of cyanobacteria.…”

Section: Seston Fatty-acid Composition and Qualitysupporting

confidence: 92%

“…Increased browning may promote the development of cyanobacteria and bacteria that lack long-chain PUFA, which may reduce the overall nutritional quality of seston (Taipale et al 2016(Taipale et al , 2018. Reduced seston quality will in turn cause decreases in long-chain PUFA content of zooplankton (Hiltunen et al 2015;Taipale et al 2016Taipale et al , 2018Lau et al 2021). This may consequently lower the marine energy transfer efficiency, but the negative impacts of browning are yet to be verified.…”

Section: Introductionmentioning

confidence: 99%

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Seawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem

Bandara

Brügel

Andersson

et al. 2022

Can. J. Fish. Aquat. Sci.

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Inflows of colored terrestrial organic matter cause seawater browning and reduced phytoplankton production in sub-Arctic coastal ecosystems, potentially deteriorating the nutritional quality of marine food webs. We analyzed the fatty-acid (FA) composition of seston and the zooplankton taxa Eurytemora affinis and cladocerans at three locations of the northern Baltic Sea. At the coastal and northerly locations, salinity and phosphorus concentrations were low, while concentrations of humic substances, i.e. terrestrial organic matter, were high. The southerly location showed the opposite trend. The ratio between alga-specific ω-3 polyunsaturated FA and terrigenous monounsaturated FA (MUFA) in Eurytemora decreased from south to north, as did the ratio between the alga-specific docosahexaenoic acid (DHA) and terrigenous MUFA in cladocerans. With increasing humic substances, the biomass of DHA-rich phytoplankton decreased and the zooplankton MUFA content increased. Our results indicate that colored terrestrial organic matter alters the phytoplankton composition, consequently affecting the zooplankton nutritional quality.

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Section: Seston Fatty-acid Composition and Qualitysupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Seawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem

Bandara

Brügel

Andersson

et al. 2022

Can. J. Fish. Aquat. Sci.

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“…Sampling dates differed among the study sites because of differences in ice-out, stratification, and circulation periods of the lakes. During our sampling period, the study lakes varied in nutrient (total dissolved N [TDN]): 62-439 μg/L; DIN: 1-26.5 μg/L; TP: 3-29 μg/L) and DOC (1.9-20 mg/L) concentrations, and in molar log 10 DIN:TP ratios (0.2-26.5; Table S1; Lau et al, 2021).…”

Section: Site Descriptionmentioning

confidence: 99%

Biomass, community composition and N:P recycling ratios of zooplankton in northern high‐latitude lakes with contrasting levels of N deposition and dissolved organic carbon

et al. 2022

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1. Global changes are causing decreases in inorganic nitrogen (N) concentrations, increases in coloured dissolved organic carbon (DOC) concentrations, and decreases in dissolved inorganic N to total phosphorus ratios (DIN:TP) in northern lakes. The effects of these changes on phytoplankton and zooplankton biomass and the N:P recycling ratio of zooplankton remain unresolved.2. In 33 Swedish headwater lakes across subarctic-to-boreal gradients with different levels of N deposition (low N in the north [Västerbotten, boreal; Abisko, subarctic] vs. high N in the south [Värmland, boreal; Jämtland, subarctic]), we measured water chemistry, phytoplankton biomass (chlorophyll-a [Chl-a], Chla:TP), seston mineral quality (C:P, N:P), as well as zooplankton biomass, community composition, and C:N:P stoichiometry. We estimated nutrient imbalances and the N:P recycling ratios of zooplankton using ecological stoichiometry models.3. There was a large-scale gradient from low lake DIN and DIN:TP in the north to high DIN and DIN:TP in the south, with lower DIN:TP in lakes coinciding with higher DOC within each region. Lower lake DIN was associated with lower phytoplankton biomass (lower Chl-a:TP). Lower lake DIN:TP was associated with richer seston mineral quality (lower seston C:P and N:P) and higher zooplankton biomass.4. Zooplankton community composition differed in the north vs. south, with a dominance of N-requiring calanoid copepods with high N:P in the north and Prequiring cladocerans with low N:P in the south. Also, greater differences in zooplankton community composition were found between subarctic regions (with lower DOC) than between boreal regions (with higher DOC), suggesting that increases in lake DOC and associated declines in lake DIN:TP reduce differences in zooplankton community composition.5. The combination of lower lake DIN, higher lake DOC, and lower lake DIN:TP led to reduced zooplankton N:P recycling ratios, possibly by reducing sestonThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Secondly, we hypothesized (H2) that the nutritional quality of seston is decreased by lake trophic status (Keva et al, 2021;Lau et al, 2021;Müller-Navarra et al, 2004;. We also assumed that this decrease in the nutritional quality of primary producers is reflected at different trophic levels via changes in the nutritional quality of their prey.…”

Section: Introductionmentioning

confidence: 99%

“…However, the growing abundance of cyanobacteria blooms in the recent past is related to climate change and especially due to the increased temperature of lakes (Deng et al, 2016; Elliot, 2012; Paerl & Huisman, 2008; Pätynen et al, 2014; Rasconi et al, 2017). Previous studies have shown that a decrease in the nutritional quality of phytoplankton is mainly attributed to the changes by the phytoplankton community structure, but also because the nutritional value of phytoplankton cells decreases by eutrophication (Keva et al, 2021; Lau et al, 2021; Taipale et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Poor nutritional quality of primary producers and zooplankton driven by eutrophication is mitigated at upper trophic levels

Taipale

Ventelä

Litmanen

et al. 2022

Ecology and Evolution

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Eutrophication and rising water temperature in freshwaters may increase the total production of a lake while simultaneously reducing the nutritional quality of food web components. We evaluated how cyanobacteria blooms, driven by agricultural eutrophication (in eutrophic Lake Köyliöjärvi) or global warming (in mesotrophic Lake Pyhäjärvi), influence the biomass and structure of phytoplankton, zooplankton, and fish communities. In terms of the nutritional value of food web components, we evaluated changes in the ω‐3 and ω‐6 polyunsaturated fatty acids (PUFA) of phytoplankton and consumers at different trophic levels. Meanwhile, the lakes did not differ in their biomasses of phytoplankton, zooplankton, and fish communities, lake trophic status greatly influenced the community structures. The eutrophic lake, with agricultural eutrophication, had cyanobacteria bloom throughout the summer months whereas cyanobacteria were abundant only occasionally in the mesotrophic lake, mainly in early summer. Phytoplankton community differences at genus level resulted in higher arachidonic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) content of seston in the mesotrophic than in the eutrophic lake. This was also reflected in the EPA and DHA content of herbivorous zooplankton (Daphnia and Bosmina) despite more efficient trophic retention of these biomolecules in a eutrophic lake than in the mesotrophic lake zooplankton. Planktivorous juvenile fish (perch and roach) in a eutrophic lake overcame the lower availability of DHA in their prey by more efficient trophic retention and biosynthesis from the precursors. However, the most efficient trophic retention of DHA was found with benthivorous perch which prey contained only a low amount of DHA. Long‐term cyanobacterial blooming decreased the nutritional quality of piscivorous perch; however, the difference was much less than previously anticipated. Our result shows that long‐term cyanobacteria blooming impacts the structure of plankton and fish communities and lowers the nutritional quality of seston and zooplankton, which, however, is mitigated at upper trophic levels.

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Lowered nutritional quality of plankton caused by global environmental changes

Abstract: This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 33 publications

References 58 publications

Seawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem

Seawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem

Biomass, community composition and N:P recycling ratios of zooplankton in northern high‐latitude lakes with contrasting levels of N deposition and dissolved organic carbon

Poor nutritional quality of primary producers and zooplankton driven by eutrophication is mitigated at upper trophic levels

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