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Article
Invasive Predator, Bythotrephes, has Varied Effects on Ecosystem Function in Freshwater Lakes
Ecosystems
  • Angela L. Strecker, Portland State University
  • Shelley E. Arnott, Queen's University - Kingston, Ontario
Document Type
Post-Print
Publication Date
1-1-2008
Subjects
  • Zooplankton,
  • Biotic communities,
  • Lakes,
  • Invasive species,
  • Phytoplankton,
  • Predation (Biology),
  • Crustacea
Abstract

Bythotrephes longimanus is an invertebrate predator that has invaded the North American Great Lakes and a number of inland lakes, where it preys on crustacean zooplankton. We examined the effect of Bythotrephes on two measures of ecosystem function during a four month observational study of freshwater lakes on the boreal shield. Bythotrephes-invaded lakes had significantly lower epilimnetic zooplankton abundance and production compared to reference lakes. On average, Bythotrephes consumed 34% ofzooplankton production when it was present in lakes. There was some evidence of changes in the timing of zooplankton production, as well as shifts to cooler, less productive habitats, which may lessen the overall effect of the invader on the transfer of energy to higher trophic levels. We experimentally demonstrated a weak trophic cascade where invader predation reduced zooplankton biomass, and subsequently increased phytoplankton growth. However, the response was small in magnitude and not biologically relevant at the whole lake- scale. The most conspicuous effect of Bythotrephes that we measured was a diversion of energy away from native predators at higher trophic levels.

Description

This is an author's manuscript whose final and definitive form has been published in Ecosystems. Copyright 2008 Springer.

The final publication is available at www.springerlink.com http://dx.doi.org/10.1007/s10021-008-9137-0

DOI
10.1007/s10021-008-9137-0
Persistent Identifier
http://archives.pdx.edu/ds/psu/11549
Citation Information
Angela L. Strecker and Shelley E. Arnott. "Invasive Predator, Bythotrephes, has Varied Effects on Ecosystem Function in Freshwater Lakes" Ecosystems (2008)
Available at: http://works.bepress.com/angela_strecker/12/