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Structure and genetic variation among populations of E uschistus heros from different geographic regions in B razil
Author(s) -
Husch Patricia Elizabeth,
Ferreira Dhiego Gomes,
Seraphim Noemy,
Harvey Nick,
SilvaBrandão Karina Lucas,
Sofia Silvia Helena,
SosaGómez Daniel Ricardo
Publication year - 2018
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/eea.12666
Subject(s) - biology , genetic diversity , pentatomidae , genetic structure , microsatellite , population , gene flow , pest analysis , biological dispersal , genetic variation , zoology , heteroptera , allele , genetics , botany , demography , sociology , gene
The Neotropical brown stink bug, E uschistus heros ( F abricius) ( H emiptera: P entatomidae), is a major Brazilian soybean pest. Aiming to provide relevant information to implement pest and insecticide resistance management, new microsatellite loci were developed for E . heros and used in a study of genetic diversity and population structure. The population analysis was performed using eight microsatellite loci from 17 samples (n = 243 individuals) collected in the major soybean‐producing regions in Brazil (northeastern, midwestern, and southern regions). These microsatellite loci provided high genetic diversity values on the whole extension for the studied region (He = 0.895; total number of alleles = 400). Neotropical brown stink bug populations in general displayed low genetic structure levels among the samples (overall Φ ST = 0.009). An exception was the sample from the northeastern region, which showed a significant genetic differentiation (pairwise Φ ST = 0.031–0.063). Bayesian cluster analysis confirmed these results, did not show population subdivision, and indicated considerable levels of gene flow. Significant correlations between genetic differences and geographic distance were obtained. The lowest estimate of migration was found in the population from São Desidério, which was also the most distant from the remaining populations based on genetic distance. Some plausible hypotheses for the low genetic differentiation among these populations are the fast expansion of soybean production areas, the main food source of E . heros , polyvoltinism, and possible influence of anthropogenic dispersal. All these factors could have led to high population densities, a wide distribution that may contribute to reduced population differentiation, and increased genetic diversity.