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Assisted migration consists of the introduction of a species to previously inhabited areas or to new suitable regions. Such introductions have been touted as a viable tool for conserving earth's biodiversity. However, both the likely success of assisted migrations and the impacts on local communities are hotly debated. Empirical data on the local impacts of assisted migration are particularly lacking. We examined the short and long time-scale effects of herbivory on Lonicera involucrata (Richards) Banks ex. Spreng (Caprifoliaceae) after an introduction of Euphydryas gillettii Barnes (Lepidoptera: Nymphalidae: Melitaeini) to Gunnison County, Colorado via an assisted migration in 1977. The plant is the primary larval hostplant for the butterfly. We quantified plant seed production, plant survival, and population stage structure in two sets of observational experiments. We found that herbivory by E. gillettii increased L. involucrata reproduction on an annual time scale, independent of plant size and local microhabitat characteristics. Over the time since the butterfly’s introduction, herbivory by E. gillettii resulted in a plant population structure biased towards smaller plants in the butterfly introduction and satellite sites compared to sites without the butterfly. Our results highlight the importance of studying effects of assisted migrations on native populations at different temporal scales. As assisted migration becomes an indispensable tool for species conservation, our work adds to the understanding of the multi-trophic impacts of assisted introductions on local populations and communities.
Knowledge graph centered on Effects of herbivory by a translocated butterfly o with 21 nodes and 171 connections. Top connected: Spruce, Lepidoptera, Picea engelmannii, C. L. Boggs, Bagged flower nectar accumulation.
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