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Lowered nutritional quality of plankton caused by global environmental changes

Lau, Danny C P and Jonsson, Anders and Isles, Peter D. F. and Creed, Irena F. and Bergström, Ann-Kristin (2021). Lowered nutritional quality of plankton caused by global environmental changes. Global Change Biology. 27 , 6294-6306
[Research article]

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Abstract

Global environmental changes are causing widespread nutrient depletion, declines in the ratio of dissolved inorganic nitrogen (N) to total phosphorus (DIN:TP), and increases in both water temperature and terrestrial colored dissolved organic carbon (DOC) concentration (browning) in high-latitude northern lakes. Declining lake DIN:TP, warming, and browning alter the nutrient limitation regime and biomass of phytoplankton, but how these stressors together affect the nutritional quality in terms of polyunsaturated fatty acid (PUFA) contents of the pelagic food web components remains unknown. We assessed the fatty acid compositions of seston and zooplankton in 33 lakes across south-to-north and boreal-to-subarctic gradients in Sweden. Data showed higher lake DIN:TP in the south than in the north, and that boreal lakes were warmer and browner than subarctic lakes. Lake DIN:TP strongly affected the PUFA contents-especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA)-in seston, calanoids, and copepods (as a group), but not in cladocerans. The EPA+DHA contents increased by 123% in seston, 197% in calanoids, and 230% in copepods across a lake molar DIN:TP gradient from 0.17 to 14.53, indicating lower seston and copepod nutritional quality in the more N-limited lakes (those with lower DIN:TP). Water temperature affected EPA+DHA contents of zooplankton, especially cladocerans, but not seston. Cladoceran EPA+DHA contents were reduced by ca. 6% for every 1 degrees C increase in surface water. Also, the EPA, DHA, or EPA+DHA contents of Bosmina, cyclopoids, and copepods increased in lakes with higher DOC concentrations or aromaticity. Our findings indicate that zooplankton food quality for higher consumers will decrease with warming alone (for cladocerans) or in combination with declining lake DIN:TP (for copepods), but impacts of these stressors are moderated by lake browning. Global environmental changes that drive northern lakes toward more N-limited, warmer, and browner conditions will reduce PUFA availability and nutritional quality of the pelagic food web components.

Authors/Creators:Lau, Danny C P and Jonsson, Anders and Isles, Peter D. F. and Creed, Irena F. and Bergström, Ann-Kristin
Title:Lowered nutritional quality of plankton caused by global environmental changes
Series Name/Journal:Global Change Biology
Year of publishing :2021
Volume:27
Page range:6294-6306
Number of Pages:13
Publisher:WILEY
ISSN:1354-1013
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:boreal lakes, dissolved organic carbon, fatty acids, N, P stoichiometry, nitrogen deposition, phytoplankton, seston, subarctic lakes, warming, zooplankton
URN:NBN:urn:nbn:se:slu:epsilon-p-113930
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113930
Additional ID:
Type of IDID
DOI10.1111/gcb.15887
Web of Science (WoS)000702006200001
ID Code:26102
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:15 Nov 2021 03:25
Metadata Last Modified:15 Nov 2021 06:01

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