Abstract

Factors limiting distribution range for most species are generally unknown regardless of whether they are native or invasive. We studied factors that could enable or restrict the distribution of two cosmopolitan invasive leafminer fly species, Liriomyza huidobrensis (Blanchard) and Liriomyza sativae (Blanchard) in their native niche. In order to test which ecological and environmental factors affect leafminer distribution we conducted thermal tolerance assays, sampled along elevation gradients and modeled species distribution. Findings from the field and rearing chambers showed a physiological restriction due to high temperatures for L. huidobrensis at 28-29 degrees C, above which adult emergence is compromised. We also found that maximum temperatures below 22 degrees C, typical of tropical highlands, favored L. huidobrensis. L. sativae was found across a wider temperature range (i.e., from 21 to 36 degrees C) in Guatemala. Our finding of a physiological threshold in temperature for L. huidobrensis may enable us to predict its invasive risk when combined with the environmental conditions at horticultural ports of entry and the global agricultural landscape. Further, it strengthens our predictions on shifts in distribution of the leafminer fly under future climate. We also found a temperature mediated competitive exclusion interaction between the two herbivore species, where L. sativae occurred at temperatures< 22 degrees C only in the absence of L. huidobrensis. We show that parasitoids had a negative effect on the leafminer flies, which varied with host plant. Finally, we show the importance of taking a multiaspect approach when investigating what limits distribution and invasiveness of a species.

Keywords

physiological limit; introduced species; native niche; Liriomyza huidobrensis; Liriomyza sativae

Published in

Journal of Insect Science
2017, Volume: 17, number: 4, article number: 88

SLU Authors

• Hof, Anouschka

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    
  • Wageningen University

Associated SLU-program

SLU Plant Protection Network


UKÄ Subject classification

Ecology


Publication identifier

DOI: https://doi.org/10.1093/jisesa/iex059

Permanent link to this page (URI)

https://res.slu.se/id/publ/86747