2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/06/2017  |   3:30 PM - 3:45 PM   |  WHAT DIFFERENCE DOES AN INVASIVE CRAYFISH MAKE? A SYNTHESIS OF THE FUNCTIONAL ROLES OF NATIVE AND NON-NATIVE CRAYFISHES IN ECOSYSTEMS   |  305A

WHAT DIFFERENCE DOES AN INVASIVE CRAYFISH MAKE? A SYNTHESIS OF THE FUNCTIONAL ROLES OF NATIVE AND NON-NATIVE CRAYFISHES IN ECOSYSTEMS

The introduction of a non-native crayfish species into a new region or habitat can have undesirable consequences, including negative effects on imperiled species. But do non-native crayfish function differently in ecosystems from the native crayfish they often displace? I review and synthesize findings of recent studies that have compared the effects of native and non-native crayfishes, including several recent meta-analyses of enclosure and mesocosm experiments, as well as field studies applying stable isotopes to compare the trophic niche of crayfishes and their food web interactions. Meta-analyses of small scale experiments have found little evidence of differences in effect sizes in ecosystem responses caused by native and non-native crayfishes, although these direct comparisons have been surprisingly rare. Stable isotope studies have found trophic niches of native and non-native crayfishes to range from highly similar to occasionally distinct. The few studies that have applied stable isotopes to characterize whole food web effects of non-native crayfish relative to native or uninvaded conditions have found some significant but relatively small effects of these invaders on their communities and ecosystems. I outline future directions needed to better understand ecosystem consequences of crayfish invasions.

  • C26 Invasive Species
  • C11 Community Ecology
  • S12 Challenges, insights, and opportunities in crayfish conservation and ecology

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Presenters/Authors

Eric Larson (), University of Illinois, erlarson@illinois.edu;


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