Mitochondrial DNA Variation in the South American Grasshopper &lt;I&gt;Dichroplus elongatus&lt;/I&gt; (Orthoptera: Acrididae)

Clemente, Marina; Remis, María Isabel; Vilardi, Juan C.

doi:10.1603/0013-8746(2000)093[0653:mdvits]2.0.co;2

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…Moreover, southern group taxa show clinal variation for centromeric position but little differentiation in mtDNA, whereas the Torresian taxon is chromosomally conservative but exhibits considerable geographic variation for mtDNA (MARCHANT and SHAW 1993). In another grasshopper, Dichroplus elongutus, chromosomally homogeneous Argentine Northwest populations exhibited restricted gene flow estimated through mtDNA variation, suggesting that the pattern of chromosome variation cannot be explained under a neutral hypothesis (REMIS et al 1998;CLEMENTE et al 2000). In these examples, the different behavior between chromosomal and mtDNA variation indicates that these markers may evolve independently, responding to different processes.…”

Section: Discussionmentioning

confidence: 98%

Steep Variation in Mitochondrial DNA and B Chromosomes among Natural Populations of Eyprepocnemis Plorans (Acrididae)

et al. 2004

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Restriction enzyme analysis of the mitochondrial DNA of Eyprepocnemis plorans with 9 restriction enzymes revealed low variability--only EcoRI revealed any variability with 3 distinguishable digestion patterns, here named types I, II and III. The samples studied were collected from regions where different types of B chromosome exist. The demes from the central area show the B1 type (as a relict of a probably once continuous distribution) and also mtDNA type II. These show a parallel substitution towards the SW neighbouring demes by other Bs and mtDNA type I. However, the latter mtDNA type had a wider distribution and is predominant, or even the only one found in most other samples where other Bs exist. Considering the mtDNA as a marker unlinked with the Bs, some genetic differences should exist among areas defined by the B chromosomes. Our results support the hypothesis that in the central region the B chromosomes and the mtDNA are involved in two different events of substitution, but these do not necessarily occur in the same way.

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Section: Discussionmentioning

confidence: 98%

Steep Variation in Mitochondrial DNA and B Chromosomes among Natural Populations of Eyprepocnemis Plorans (Acrididae)

et al. 2004

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“…If variation is assumed to be neutral for several loci, similar patterns of differentiation among populations may be expected for each locus (Hedrick, 2000). Secondly, the hierarchial analyses of molecular differentiation at the mitochondrial DNA level, an essentially neutral marker, revealed a discrepancy with respect to chromosome differentiation (Clemente et al. , 2000).…”

Section: Introductionmentioning

confidence: 99%

Effects of B chromosomes and supernumerary segments on morphometric traits and adult fitness components in the grasshopper, Dichroplus elongatus (Acrididae)

Rosetti

Vilardi

Remis

2006

J of Evolutionary Biology

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The South American species, Dichroplus elongatus, is polymorphic for B chromosomes and supernumerary segments in chromosome pairs M6 (SS6), S9 (SS9) and S10 (SS10). Both forms of supernumerary heterochromatin shape chiasma frequency and distribution and B chromosomes also affect male fertility. Here, we analysed the effects of these polymorphisms on morphometric traits (total, 3rd femur, 3rd tibia, thorax and tegmen lengths) and several adult fitness components, including male and female mating success, and female reproductive potential. B chromosomes tend to decrease, and SS6 segments to increase the body size of carriers. The analysis of reproductive potential suggested that B chromosome carrying females have higher numbers of embryos per clutch and ovarioles per ovary. The uni‐ and multivariate analysis of mating success revealed that sexual selection favours larger individuals of both sexes and males with standard karyotype. B chromosomes may have accumulation mechanisms, which involve preferential transmission of B chromosomes to germ cells or functional gametes. The maintenance of Bs might be explained by interactions among accumulation mechanisms and trade‐offs between detrimental and favourable effects on different fitness components.

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Interaction among different heterocromatic variants in the grasshopper Dichroplus elongatus

2004

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Simultaneous chromosome polymorphisms for supernumerary elements allow us to analyse the relationships among different forms of heterochromatic variation in nature. We report simultaneous variation patterns for supernumerary segments in chromosomes S10 (SS10), S9 (SS9) and S6 (SS6) and B chromosomes in nine populations of the grasshopper Dichroplus elongatus from two biogeographic provinces from east Argentina. Our results show spatial chromosome differentiation for three out of four supernumerary heterochromatic variants (B chromosomes, SS6 and SS10). The incidence of B chromosomes was negatively correlated with the SS10 frequency. The distribution pattern analysis shows different degree of differentiation among populations for each supernumerary heterochromatic variant suggesting that the detected chromosome variation cannot be explained by interaction between migration and genetic drift. Moreover, the observed population chromosome differentiation was not in agreement with the hierarchical analysis of molecular of heterogeneity at mitochondrial DNA level (mtDNA). The present results point out the importance of the interaction among heterochromatic variants in the chromosome intraspecific variation in east Argentina natural populations of the grasshopper D. elongatus.

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Mitochondrial DNA Variation in the South American Grasshopper <I>Dichroplus elongatus</I> (Orthoptera: Acrididae)

Cited by 7 publications

References 21 publications

Steep Variation in Mitochondrial DNA and B Chromosomes among Natural Populations of Eyprepocnemis Plorans (Acrididae)

Steep Variation in Mitochondrial DNA and B Chromosomes among Natural Populations of Eyprepocnemis Plorans (Acrididae)

Effects of B chromosomes and supernumerary segments on morphometric traits and adult fitness components in the grasshopper, Dichroplus elongatus (Acrididae)

Interaction among different heterocromatic variants in the grasshopper Dichroplus elongatus

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