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Species complex diversification by host plant use in an herbivorous insect: The source of Puerto Rican cactus mealybug pest and implications for biological control
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  • Daniel Poveda-Martínez,
  • María Aguirre,
  • Guillermo Logarzo,
  • Stephen Hight,
  • Serguei Triapitsyn,
  • Hilda Diaz-Sotero,
  • Marcelo Vitorino,
  • Esteban Hasson
Daniel Poveda-Martínez
Fundación para el Estudio de Especies Invasivas
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María Aguirre
Fundación para el Estudio de Especies Invasivas
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Guillermo Logarzo
Fundación para el Estudio de Especies Invasivas
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Stephen Hight
U.S. Department of Agriculture-ARS
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Serguei Triapitsyn
University of California
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Hilda Diaz-Sotero
Caribbean Advisor to the APHIS Administrator, USDA
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Marcelo Vitorino
Universidade Regional de Blumenau
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Esteban Hasson
Instituto de Ecología, Genética y Evolución de Buenos Aires
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Abstract

Cryptic taxa have often been observed in the form of host‐associated species that diverged as the result of adaptation to alternate host plants. Untangling cryptic diversity in species complexes that encompass invasive species is a mandatory task for pest management. Moreover, investigating the evolutionary history of a species complex may help to understand the drivers of their diversification. The mealybug Hypogeococcus pungens was believed to be a polyphagous species from South America and has been reported as a pest devastating native cacti in Puerto Rico, also threatening cactus diversity in the Caribbean and North America. There is neither certainty about the identity of the pest, nor the source population from South America. Recent studies pointed to substantial genetic differentiation among local populations, suggesting that H. pungens is a species complex. In this study, we used a combination of genome-wide SNPs and mtDNA variation to investigate species diversity within H. pungens sensu lato to establish host plant ranges of each one of the putative members of the complex, to evaluate whether the pattern of host plant association drove diversification in the species complex, and to determine the source population of the Puerto Rican cactus pest. Our results suggested that H. pungens comprises at least five different species, each one strongly associated with specific host plants. We also established that the Puerto Rican cactus pest derives from southeastern Brazilian mealybugs. This is an important achievement because it will help to design reliable strategies for biological control using natural enemies of the pest from its native range.

Peer review status:UNDER REVIEW

05 May 2020Submitted to Molecular Ecology
06 May 2020Assigned to Editor
06 May 2020Submission Checks Completed
20 May 2020Review(s) Completed, Editorial Evaluation Pending