EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/27/2021  |   2:00 PM - 3:30 PM   |  SYNERGISTIC EFFECTS OF INVASIVE GOLDFISH AND CHINESE MYSTERY SNAILS ON A NATIVE POND COMMUNITY   |  Virtual Platform

SYNERGISTIC EFFECTS OF INVASIVE GOLDFISH AND CHINESE MYSTERY SNAILS ON A NATIVE POND COMMUNITY

Invasive species can affect native communities through multiple mechanisms including competition, predation, and habitat alteration. Untangling these effects in a dynamic ecosystem presents a challenge, especially when multiple invaders are present. Co-occurrence of multiple invaders may lead to invasional meltdown, in which invaders facilitate one another and amplify effects on native communities. Urban habitats such as stormwater ponds are particularly prone to species invasions due to habitat alteration and increased likelihood of anthropogenic introductions. We conducted a mesocosm experiment to study how urban pond communities are impacted by two freshwater invasive species that co-occur in Dane County, Wisconsin: goldfish (Carassius auratus) and Chinese mystery snails (Cipangopaludina chinensis). We found that Chinese mystery snails exerted competitive effects on native amphibians. Goldfish altered primary production and reduced zooplankton, amphibian, and juvenile native snail survival through predation. Chinese mystery snails had higher reproductive success when goldfish were present, likely due to competitive release from native grazers. Our results indicate that facilitation may be occurring between these two nonnative species, suggesting potential for invasional meltdown in urban ponds.

  • Species interactions
  • Urban
  • Facilitation

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Presenters/Authors

Erin Crone (), Colorado State University, Erin.Crone@colostate.edu;


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Erin Crone (), University of Arkansas, Erin.Crone@colostate.edu;


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Daniel Preston (), Colorado State University, Dan.Preston@colostate.edu;


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