Population Explosion in the Yellow-Spined Bamboo Locust Ceracris kiangsu and Inferences for the Impact of Human Activity

Abstract

Geographic distance and geographical barriers likely play a considerable role in structuring genetic variation in species, although some migratory species may have less phylogeographic structure on a smaller spatial scale. Here, genetic diversity and the phylogenetic structure among geographical populations of the yellow-spined bamboo locust, Ceracris kiangsu, were examined with 16S rDNA and amplified fragment length polymorphisms (AFLPs). In this study, no conspicuous phylogeographical structure was discovered from either Maximum parsimony (MP) and Neighbor-joining (NJ) phylogenetic analyses. The effect of geographical isolation was not conspicuous on a large spatial scale.At smaller spatial scales local diversity of some populations within mountainous areas were detected using Nei's genetic distance and AMOVA. There is a high level of genetic diversity and a low genetic differentiation among populations in the C. kiangsu of South and Southeast China. Our analyses indicate that C. kiangsu is a monophyletic group. Our results also support the hypothesis that the C. kiangsu population is in a primary differentiation stage. Given the mismatch distribution, it is likely that a population expansion in C. kiangsu occurred about 0.242 Ma during the Quaternary interglaciation. Based on historical reports, we conjecture that human activities had significant impacts on the C. kiangsu gene flow.

Identification of outliers in a genomic scan for selection along environmental gradients in the bamboo locust, Ceracris kiangsu

“…One distinct characteristic of the species is its greater flight ability, presumably leading to frequent gene flows between populations. Fan et al previously reported that this species has low levels of genetic structure and relatively high gene flow 17 , suggesting shallow evolutionary trajectories and limited or absent adaptive divergence among local populations.…”

“…Genome scans used in parallel with environmental data provide distinct clues for selective forces that act on molecular markers of adaptive relevance in the real landscape 17 and will complement and strengthen robustness of the final set of loci identified as potentially under selection 18 . It is now possible to implement such an approach relatively cheaply on a genome-wide scale.…”

Monitoring of the Apple Fruit Moth: Detection of Genetic Variation and Structure Applying a Novel Multiplex Set of 19 STR Markers

“…Genetic drift alone may act on insect populations, resulting in genetically distinct populations, due to reproductive isolation, or interruption of gene flow among regions [ 15 ]. Further, reproductive isolation is impacted by the population size, individual dispersal, geographic isolation, and local ecological adaptation [ 16 , 17 , 18 , 19 ]. Dispersal is a key factor in both population dynamics and genetic exchange [ 20 ].…”

Genetic Diversity in Apple Fruit Moth Indicate Different Clusters in the Two Most Important Apple Growing Regions of Norway

“…Insect populations may become genetically distinct because of reproductive isolation or lack of gene flow between different regions [12]. Further, reproductive isolation is influenced by several factors such as individual dispersal ability, ecological isolation, geographic barriers, and local adaptation after natural selection [13][14][15][16]. Dispersal is a key factor in population dynamics [17].…”

“…In Spain, backcross hybrid between Drosophila buzzatii and Drosophila koepferae species was detected using AFLP [26]. AFLP was used to detect the impacts of human activities on the Bamboo Locust Ceracris kiangsu genetic structure in China [13] and the population dynamics of Hydropsyche orientalis and Stenopsyche marmorata in Japan [27].…”