The existence of a continuous array of sympatric biotypes—from polymorphisms, through
ecological or host races with increasing reproductive isolation, to good species—can …

▪ Abstract Sympatric speciation is the splitting of one evolutionary lineage into two without
the occurrence of geographic isolation. The concept has been intimately tied to entomology …

The notion that shifts to new hosts can initiate insect speciation is more than 150 years old,
yet widespread conflation with paradigms of sympatric speciation has led to confusion about …

To determine the effects of dispersal ability and diet breadth on population-genetic structure,
we reviewed the allozyme literature and estimated genetic isolation by distance (IBD) for 43 …

There is growing awareness of the importance of natural selection in driving genetic
divergence and speciation, and several of the most apparent cases of this ecological …

Nominally polyphagous species of herbivorous insects sometimes are comprised of multiple
morphologically similar biological species with more specialized appetites. When meristic …

Parasitic species can dramatically alter host traits. Some of these parasite‐induced changes
can be considered adaptive manipulations that benefit the parasites. Gall‐inducing insects …

In Guatemalan villages people commonly rear pigs, and both hosts may be infected with
Ascaris. This study was designed to ask whether both humans and pigs are potential hosts …

Galls are modified, invariably symmetrical, naturally developing plant structures that arise
because of messages from certain specialist insects, mostly from the Thysanoptera …

Host shifts followed by specialization can result in sympatric genetic differentiation, and may
have fuelled the diversification of phytophagous insects. This study examines a recent …