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Sodium dynamics in a northern ecosystem.

D B Botkin1, P A Jordan, A S Dominski

  • 1School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut 06520.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1973
PubMed
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Sodium availability in vegetation is a key factor controlling moose populations on Isle Royale. Aquatic plants offer a rich sodium source, potentially supporting moose if they can store the element.

Area of Science:

  • Ecology
  • Wildlife Biology
  • Animal Nutrition

Background:

  • Moose (Alces alces) populations on Isle Royale are influenced by resource availability.
  • Sodium is an essential element for large herbivores, but its dietary sources can be limited.
  • Previous research has underestimated the sodium content of freshwater aquatic vegetation.

Purpose of the Study:

  • To analyze terrestrial sodium sources and estimate the sodium requirements of moose on Isle Royale.
  • To investigate the role of sodium availability in regulating moose population dynamics.
  • To assess the contribution of aquatic vegetation to moose sodium intake.

Main Methods:

  • Analysis of sodium content in terrestrial and aquatic plants consumed by moose.
  • Estimation of moose sodium requirements based on physiological needs.

Related Experiment Videos

  • Correlation analysis of sodium and chloride concentrations in water plants.

    • Main Results:

    • Terrestrial vegetation on Isle Royale is notably low in sodium.
    • Submerged and floating-leaved aquatic plants exhibit significantly higher sodium concentrations.
    • Consumption of aquatic plants during summer could meet moose sodium requirements if the element can be stored.

    Conclusions:

    • Sodium availability, particularly from aquatic sources, is a critical limiting factor for the Isle Royale moose population.
    • Freshwater aquatic plants represent an underappreciated but vital sodium reservoir for moose.
    • The high sodium content in aquatic plants, often exceeding chloride, suggests NaCl uptake is feasible.