Chromosome polymorphisms and natural selection inLeptysma argentina (Orthoptera): external phenotype affected by a centric fusion predicts adult survival

The significance of body size in the Orthoptera: a review

“…Apparently, this may be an adaptive effect of chromosome polymorphisms, which probably support genes that cause increased body size in the appropriate environments. This would be another evidence of adaptive effects associated with chromosome polymorphisms, of which abundant evidence has been provided in the past (Colombo 1993;Colombo & Confalonieri 1996;Norry & Colombo 1999;Colombo et al 2004;Romero et al 2014). Current molecular studies may shed more light on these patterns.…”

Relationship between Chromosomal Races/Subraces in the Brachypterous Grasshopper Podisma sapporensis (Orthoptera: Acrididae) Inferred from Mitochondrial ND2 and COI Gene Sequences

“…By studying fusion 3/6 frequency in young and aged males in two populations of this species, male longevity was assessed, determining that fusion 3/6 increases male longevity in carriers (Colombo 1993(Colombo , 2002. A later study identified the effect of fusion 3/6 on body sizerelated traits, such as femur length, as the cause for this increase in longevity of fusion carriers (Norry and Colombo 1999). Body size-related traits also seem to be the reason for the effect of fusion 3/6 on other selection components.…”

Cytogeography and the evolutionary significance of B chromosomes in relation to inverted rearrangements in a grasshopper species

“…We also presented the analysis of a single large sample from Uspallata, and demonstrated that Bs have some influence on body size, enlarging many of the morphometric characters of individuals. We know that increased body size often appears to confer significant advantages for adult fitness components in Drosophila (Santos et al, 1988;Hasson et al, 1993;Partridge and Fowler, 1993) and in other insects (Norry and Colombo, 1999). It has been proposed that exotermic organisms tend to be larger in colder climates, however, this does not seem to apply to T. pallidipennis, where body size in cooler climates is smaller (Colombo and Confalonieri, 1996).…”