2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/07/2017 | 9:45 AM - 10:00 AM | EFFECTS OF NATIVE AND INVASIVE SPECIES, SOURCE POPULATION, AND STREAM DRYING ON CRAYFISH POPULATION DYNAMICS AND ECOSYSTEM STRUCTURE AND FUNCTION | 305A
EFFECTS OF NATIVE AND INVASIVE SPECIES, SOURCE POPULATION, AND STREAM DRYING ON CRAYFISH POPULATION DYNAMICS AND ECOSYSTEM STRUCTURE AND FUNCTION
Invasive crayfish are a significant threat to native endemic crayfish in the Ozark Highlands of Arkansas and Missouri, an area where stream drying is a prominent disturbance. Objectives of this study were to examine the effects of native and invasive crayfish source population, and stream drying on crayfish population dynamics and ecosystem structure and function. We performed a fully factorial mesocosm experiment with crayfish (native Orconectes eupunctus, invasive O. neglectus from AR, and invasive O. neglectus from KS) and stream drying (drying and control) treatments. Data were analyzed with two-way ANOVAs and negative binomial regressions. Crayfish growth was greatest in O. neglectus (AR) treatments. Chlorophyll a was greatest in O. neglectus (KS) treatments, although not significantly. Leaf decomposition was least in O. eupunctus treatments. Drying treatments reduced chlorophyll a, sedimentation, and Chironomidae abundance, and increased autotrophic index. Macroinvertebrate richness was greater in control than drying treatments except for O. neglectus (AR). Results from this study indicate that O. eupunctus and O. neglectus are not ecologically redundant and invasive species source population may differentially affect population dynamics and ecosystem structure and function.
- C26 Invasive Species
- C03 Invertebrates
- S12 Challenges, insights, and opportunities in crayfish conservation and ecology
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Presenters/Authors
Nicole Graham
(), University of Arkansas, negraham@uark.edu;
ASHA DISCLOSURE:
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Daniel Magoulick
(), Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, danmag@uark.edu;
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Nonfinancial -