Spatially Varying Frequencies Reveal the Invasion Origin of an Agricultural Pest Recently Introduced From Europe to North America.

The introduction of non-native species across the world represents a major global challenge. Retracing invasion origin is an important first step in understanding the invasion process, often requiring detailed sampling within the native range. Insect species frequently host , a widespread endosymbiotic bacterium that manipulates host reproduction to increase infected female fitness.

Transcriptome analyses of leaf architecture in support a common genetic toolkit in the parallel evolution of unifacial leaves in monocots.

Planar structures dramatically increase the surface-area-to-volume ratio, which is critically important for multicellular organisms. In this study, we utilize naturally occurring phenotypic variation among three species (Asperagaceae) to investigate leaf margin expression patterns that are associated with mediolateral and adaxial/abaxial development. We identified differentially expressed genes (DEGs) between center and margin leaf tissues in two planar-leaf species and and compared these with expression patterns within the cylindrically leaved .

Evidence for spatial clines and mixed geographic modes of speciation for North American cherry-infesting (Diptera: Tephritidae) flies.

An important criterion for understanding speciation is the geographic context of population divergence. Three major modes of allopatric, parapatric, and sympatric speciation define the extent of spatial overlap and gene flow between diverging populations. However, mixed modes of speciation are also possible, whereby populations experience periods of allopatry, parapatry, and/or sympatry at different times as they diverge.