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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.

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.