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Summary
This summary is machine-generated.

Winter brownification from humic substances increases mortality in young three-spined stickleback (Gasterosteus aculeatus). Poorer light conditions reduced foraging efficiency, leading to lower body condition and survival.

Keywords:
BrownificationFeeding efficiencyLight limitationMetabolismWinter mortality

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Area of Science:

  • Ecology
  • Aquatic Biology
  • Environmental Science

Background:

  • Winter poses survival challenges for organisms in northern climates due to limited light and resources.
  • Aquatic ecosystems are experiencing increased brownification from humic substances, further reducing light penetration.
  • This reduced light may negatively impact foraging rates and increase starvation mortality, particularly for visual feeders.

Purpose of the Study:

  • To investigate the effects of experimentally increased humic water input on the survival and foraging of young-of-the-year three-spined stickleback over winter.
  • To determine if brownification-induced light reduction impacts fish body condition, prey consumption, and mortality rates.

Main Methods:

  • Large outdoor enclosures were used to simulate increased humic water input.
  • Population densities of three-spined stickleback were estimated in autumn and the following spring.
  • Food availability, consumption rates, and light conditions were monitored throughout the winter period.

Main Results:

  • Mortality rates were significantly higher in humic conditions (76%) compared to ambient conditions (64%).
  • Fish in humic conditions exhibited lower body condition and ingested less prey biomass.
  • Resource availability did not differ between conditions, but light levels were significantly reduced under humic treatment.

Conclusions:

  • Reduced light availability, not decreased food resources, was the primary driver of increased mortality and reduced foraging success in three-spined stickleback.
  • Impaired visual search efficiency in darker waters negatively affects fish health and survival.
  • Future increases in aquatic brownification may threaten fish populations by impacting recruitment and density.