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Lack of phenotypic variation in larval utilization of pea aphids in populations of the ladybeetle Hippodamia convergens

Christy Grenier, Bryce Summerhays, Ryan Cartmill, Tanairi Martinez, Roxane Saisho, Alexander Rothenberg, Jerrika Scott, John J Obrycki, Arun Sethuraman
doi: https://doi.org/10.1101/740506
Christy Grenier
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Bryce Summerhays
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Ryan Cartmill
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Tanairi Martinez
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Roxane Saisho
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Alexander Rothenberg
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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Jerrika Scott
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
+Department of Biology, Benedict College, Columbia, South Carolina
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John J Obrycki
$Department of Entomology, University of Kentucky, Lexington, Kentucky
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Arun Sethuraman
*Department of Biological Sciences, California State University San Marcos, San Marcos, California
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  • For correspondence: asethuraman@csusm.edu
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Abstract

The convergent lady beetle (Hippodamia convergens) is a generalist natural enemy that is utilized extensively in augmentative biological control across the United States. Recent studies have pointed to both genetic and phenotypic differences in Western (California) versus Eastern (Kansas) populations of the species. Here we investigate phenotypic differences in their utilization of pea aphids in (a) Eastern versus Western populations, (b) Hybrid Eastern and Western populations versus their progenitor populations, and (c) within population competition rates in Eastern, Western, and Hybrid populations. Across eight replicate treatments, we find no phenotypic differences (P > 0.2), contradicting previous genetic and behavioral studies. Hybrid F1 populations however show an overall greater percentage weight gain, potentially indicative of a hybrid vigor effect, and greater fitness of augmented populations of the species.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted August 20, 2019.
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Lack of phenotypic variation in larval utilization of pea aphids in populations of the ladybeetle Hippodamia convergens
Christy Grenier, Bryce Summerhays, Ryan Cartmill, Tanairi Martinez, Roxane Saisho, Alexander Rothenberg, Jerrika Scott, John J Obrycki, Arun Sethuraman
bioRxiv 740506; doi: https://doi.org/10.1101/740506
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Lack of phenotypic variation in larval utilization of pea aphids in populations of the ladybeetle Hippodamia convergens
Christy Grenier, Bryce Summerhays, Ryan Cartmill, Tanairi Martinez, Roxane Saisho, Alexander Rothenberg, Jerrika Scott, John J Obrycki, Arun Sethuraman
bioRxiv 740506; doi: https://doi.org/10.1101/740506

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