Eur. J. Entomol. 110 (2): 181-185, 2013 | 10.14411/eje.2013.028

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

Claudio J. BIDAU1, Dardo A. MARTÍ2,3
1 Paraná y Los Claveles, 3300 Posadas, Misiones, Argentina; e-mail: bidau47@yahoo.com
2 Laboratorio de Genética Evolutiva, Facultad de Ciencias Exactas, Químicas y Naturales, Universidad Nacional de Misiones, Félix de Azara 1552, 3300 Posadas, Misiones, Argentina; e-mail: darmarti@yahoo.com.ar
3 IBS-CONICET

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

Received: October 7, 2012; Accepted: November 5, 2012; Published: April 11, 2013

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