2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/23/2019 | 2:45 PM - 3:00 PM | POTENTIAL FOR A MULTI-SPECIES REFUGE: INVESTIGATING COMPETITION BETWEEN HISTORICALLY CO-OCCURRING CYPRINIDS | 250 DE

POTENTIAL FOR A MULTI-SPECIES REFUGE: INVESTIGATING COMPETITION BETWEEN HISTORICALLY CO-OCCURRING CYPRINIDS

In many desert ecosystems, native fish conservation is limited by suitable habitat; open waters are invaded by non-native species and refuge habitats are scarce. We investigated the potential for success of a multi-species native fish refuge by assessing interactions between Owens Speckled Dace and two size classes of Owens tui chub (e.g. competition and predation). We used replicated aquatic mesocosms to test the effects of interspecific interaction on fish body condition, growth, and survivorship using five different combinations of species and size. Our study found that dace body condition was negatively affected by competition with small chub while growth and body condition of large and small chub were not affected by the presence of dace. We did not find evidence of predation of dace by large chub. Our results suggest that dace survival is more affected by competition with small chub than by predation by large chub. Restoring sympatric populations of the two species may be possible if refuge habitat complexity reduces the potential for interactions between dace and small chub or if chubs are able to grow rapidly to larger size classes.

Fish
Mesocosm
Predator-prey

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Presenters/Authors

Christi Kruse (), Oregon State University, krusech@oregonstate.edu;