The central-marginal hypothesis in acridid Orthoptera: A critique of Colombo's (2012) article

Abstract

We discuss and criticise the contention of Colombo (2012) that the central-marginal model does not apply to three species of chromosomally polymorphic acridid grasshoppers, and that chromosomal clines in these species are a consequence of temperature gradients. We also discuss Colombo's interpretation of our own results on the South American melanopline grasshopper, Dichroplus pratensis Bruner.

Keywords

• orthoptera
• acrididae
• dichroplus pratensis
• abiotic factors
• environmental gradients
• marginal populations
• peripheral populations
• polymorphism
• species limits
• species range