Population differentiation in the grasshopper Sinipta dalmani: body size varies in relation to karyotype and climatic conditions

  title={Population differentiation in the grasshopper Sinipta dalmani: body size varies in relation to karyotype and climatic conditions},
  author={M. I. Remis},
Abstract Sinipta dalmani is an Argentine grasshopper whose chromosome polymorphisms have been widely studied through cytogenetic and fitness-component analyses. This paper reviews the available information on its body-size variations as they relate to differences between sexes, karyotype and mating success, and shows a preliminary analysis of a pattern of geographic variation. A significant body-size sexual dimorphism was evident, with females being significantly larger than males. Polymorphic… Expand
Morphometric Variation Affecting Sexual Size Dimorphism in Neopedies brunneri (Orthoptera: Acrididae)
The first preliminary analysis of phenotypic variation in natural populations of N. brunneri from central Argentina found the existence of morphometrical differences among populations and a pattern of geographical variation, with males and females from eastern populations being larger than the ones from the west. Expand
Morphometric Differentiation in Cornops aquaticum (Orthoptera: Acrididae): Associations With Sex, Chromosome, and Geographic Conditions
The results found would support the hypothesis that some supergenes located in the fusions may be favored in the southern populations, thus contributing to the establishment and maintenance of the polymorphism. Expand
Geographic variation in wing size and shape of the grasshopper Trilophidia annulata (Orthoptera: Oedipodidae): morphological trait variations follow an ecogeographical rule
The size variations in body, forewing and hindwing of T. annulata apparently follow the Bergmann clines, and the shape of the forewing among populations can be divided into geographical groups, however hindwing shape are geographical overlapped, and populations cannot be divided Into geographical groups. Expand
The significance of body size in the Orthoptera: a review
Abstract This review discusses body size and mass as they relate to the Orthoptera (crickets, katydids, grasshoppers) and the Phasmatodea (walkingsticks). It addresses the expression, causes andExpand
Discriminating species of Sinipta Stål (Orthoptera: Acrididae) from Uruguay based on morphological, ethological and molecular data
Two species of the genus Sinipta, S. dalmani and S. hectorisperonii, exist in Uruguay and the combined results suggest that the two studied taxa are distinct species, and point to features suitable for their identification. Expand
Taxonomic delimitation in color polymorphic species of the South American grasshopper genus Diponthus Stål (Orthoptera, Romaleidae, Romaleini)
It is concluded that in D. argentinus body coloration varies considerably across the geographic distribution range but without any noticeable color gradient correlated with the latitude, and according to the phylogenetic species concept (PSC) it is considered D. pycnostictus Pictet & Saussure as valid species. Expand


Multivariate analysis of male mating success on morphometric traits and chromosome dosage in the grasshopper Sinipta dalmani
The results indicate that differences in some body size-related traits are determined by the karyotype, and that of these length of 3rd tibia provides the greatest contribution to variation in fitness. Expand
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The male sexual selection study agrees with previous results, showing the importance of the third pair of legs in male mating success among grasshoppers and directional sexual selection favours the females with increased TL and fusion dosage. Expand
Chromosome Inversion Polymorphisms Influence Morphological Traits in Trimerotropis Pallidipennis (Orthoptera)
The hypothesis that reduced body size in a context of reduced minimum temperature may be a response to shortened development season, and so smaller individuals may be advantageous is put forward. Expand
Variation in Adult Female Body Size Related to Chromosome Polymorphism and Female Mating Success in Sinipta dalmani (Orthoptera: Acrididae)
The female differential mating success detected in S. dalmani suggests a significant male investment in offspring, and the analysis of selection differentials showed that third tibia length might be negatively selected during mating. Expand
Chromosome polymorphisms and natural selection inLeptysma argentina (Orthoptera): external phenotype affected by a centric fusion predicts adult survival
The relationship between fitness variation associated with a quantitative trait and a Mendelian factor affecting that trait was examined in a natural population of the South AmericanExpand
Chromosomal polymorphism, morphological traits and male mating success in Leptysma argentina (Orthoptera)
Since the phenotypic correlations among traits were significant, the selective effects were assessed by means of a multivariate analysis, which demonstrated that selection acted significantly on femur length only, selection on karyotype being indirect. Expand
Dichroplus vittatus (Orthoptera: Acrididae) follows the converse to Bergmann's rule although male morphological variability increases with latitude
It is suggested that the observed decrease in size with latitude together with the increase in morphological variability is a consequence of a number of factors: the shortening of the growing season southwards; the increasing seasonality and climatic unpredictability; and the fact that the species exhibits protandry which contributes to smaller and more variable size in males and smaller but more constant body size in females. Expand
Cytogenetic studies inSinipta dalmani Stal (Orthoptera: Acrididae). III: Pericentric M4 inversion affecting morphological traits
Three population samples of Sinipta dalmani polymorphic for the M4 inversion were analysed for five body-size-related traits: total body, tegmina, third femur, third tibia and thorax lengths, suggesting that the differences between karyomorphs are largely additive. Expand
Fitness effect analysis of a heterochromatic supernumerary segment in the grasshopper Eyprepocnemis plorans
The SCS polymorphism seems to be at a status close to neutrality in respect to fitness, but its slight disadvantage in transmission through females carrying B chromosomes predicts that the polymorphism should tend to disappear, unless SCS recurrent amplification, or another undiscovered force, counteracts this tendency. Expand
  • D. Gwynne
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1984
Sexual selection and its consequences at different sites are examined by testing the prediction that sexual selection on females, as estimated by variance in mating success, should be greater at sites where sexual competition among females is observed and detailing the differences in courtship behavior between sites that have apparently resulted from differences in sexual selection. Expand