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Complex interactions between native and invasive fish: the simultaneous effects of multiple negative interactions

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Abstract

We suggest that the ultimate outcome of interactions between native species and invasive species (extinction or coexistence) depends on the number of simultaneous negative interactions (competition and predation), which depends on relative body sizes of the species. Multiple simultaneous interactions may constrain the ability of native species to trade fitness components (i.e., reduced growth for reduced risk of predation) causing a spiral to extinction. We found evidence for five types of interactions between the adults and juveniles of introduced western mosquitofish (Gambusia affinis) and the juveniles of native least chub (Iotichthys phlegethontis). We added ten large (23–28 mm) and seven small (9–13 mm) young-of-the-year (YOY) least chub to replicate enclosures with zero, low, and high densities of mosquitofish in a desert spring ecosystem. Treatments with mosquitofish reduced the average survival of least chub by one-third. No small YOY least chub survived in enclosures with high mosquitofish densities. We also performed two laboratory experiments to determine mortality to predation, aggressiveness, and habitat selection of least chub in the presence of mosquitofish. Mean mortality of least chub due to predation by large mosquitofish was 69.7% over a 3-h trial. Least chub were less aggressive, selected protected habitats (Potamogeton spp.), and were more stationary in the presence of mosquitofish where the dominance hierarchy was large mosquitofish>>large least chub≈small mosquitofish>>small least chub. Least chub juveniles appear to be figuratively caught in a vice. Rapid growth to a size refuge could reduce the risk of predation, but the simultaneous effects of competition decreased least chub growth and prolonged the period when juveniles were vulnerable to mosquitofish predation.

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Acknowledgements

We gratefully acknowledge funding support from the Utah Division of Wildlife Resources and logistical support from Jay Banta and the staff at the Fish Springs National Wildlife Refuge. We thank Benjamin Shettell, Adrian Bell, and Amy Schweitzer for assistance in setting up our field experiment. This study was conducted under the approval of the Institutional Animal Care and Use Committee at Brigham Young University. Permits to collect the fish used in this study were provided by the Utah Division of Wildlife Resources.

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Correspondence to Russell B. Rader.

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Mills, M.D., Rader, R.B. & Belk, M.C. Complex interactions between native and invasive fish: the simultaneous effects of multiple negative interactions. Oecologia 141, 713–721 (2004). https://doi.org/10.1007/s00442-004-1695-z

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Keywords

  • Biological invasions
  • Competition
  • Predation
  • Gambusia affinis
  • Iotichthys phlegethontis