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Wednesday, June 3, 2015
locust vs grasshopper
In a 2010 article on locusts that was published in the Encyclopedia of Animal Behavior, Alexandre Vsevolo Latchininsky, Extension Entomologist for the State of Wyoming, explains that "all locusts are grasshoppers but not all grasshoppers are locusts." He defines locusts as "short-horned grasshoppers (Orthoptera: Acrididae), distinguished by their density-dependent behavioral, physiological, and phenotypic polymorphism."
The phenotype mutability refers to the fact that for some subspecies of locusts, the different stages of life are marked by different colors and even body shapes. However, it is the behavioral aspect—the mass grouping together—that is most notable. The act of swarming, or exhibiting a so-called "gregarious phase," is the most obvious characteristic that identifies a subspecies of grasshopper as a locust.
Latchininsky explains in his paper that "out of more than 12,000 described grasshopper species in the world, only about a dozen exhibit pronounced behavioral and/or morphological differences between phases of both nymphs and adults, and should be considered locusts." And in fact, the tendency to swarm together is a relatively recent phenomenon in grasshopper evolution.