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Primary Production01:06

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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  1. Home
  3. Research Domains
  5. Agricultural, Veterinary And Food Sciences
  7. Fisheries Sciences
  9. Fish Physiology And Genetics
  11. Warmer Lakes Support Phytoplankton Over Fish

Warmer Lakes Support Phytoplankton Over Fish

Benjamin Paul Mooney1, Anna Gårdmark1, Carolyn Faithfull1

  • 1Department of Aquatic Resources, Swedish University of Agricultural Sciences, Uppsala, Sweden.

Global Change Biology
|June 9, 2025

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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

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View abstract on PubMed

Summary
This summary is machine-generated.

Climate warming lowers fish biomass in lakes, shifting energy from predators to phytoplankton. This indicates reduced food web efficiency and predator biomass in warmer aquatic ecosystems.

Area of Science:

  • Aquatic ecology
  • Climate change science
  • Ecosystem dynamics

Background:

  • Climate warming alters aquatic ecosystems, affecting biomass distribution across trophic levels.
  • Understanding these shifts is crucial for ecosystem functioning and service provisioning.

Purpose of the Study:

  • To investigate how climate warming impacts fish-to-phytoplankton biomass ratios in temperate and boreal lakes.
  • To test the hypothesis that warmer lakes have higher fish biomass relative to phytoplankton, and if this is moderated by nutrient availability.

Main Methods:

  • Utilized a space-for-time approach across lakes with varying temperatures and nutrient levels.
  • Analyzed species and biomass data for phytoplankton, zooplankton, and fish.
  • Examined relationships between temperature, phosphorus, and biomass ratios.
Keywords:
aquatic food websbiomass distributionclimate warmingenergy transfer efficiency

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Main Results:

  • Contrary to hypotheses, warmer lakes showed lower fish-to-phytoplankton biomass ratios.
  • This trend persisted irrespective of phosphorus concentrations or benthic production.
  • Increased phytoplankton biomass in warmer lakes did not correlate with higher fish biomass.

Conclusions:

  • Warming temperatures reduce energy transfer efficiency from producers to consumers in lakes.
  • Shifts in phytoplankton and fish community composition explain the decoupling of producer and predator biomass.
  • Rising temperatures may lead to decreased food web efficiency and predator biomass in northern lakes.
temperature gradient