Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions
The water-hyacinth grasshopper Cornops aquaticum (Bruner) (Orthoptera: Acrididae) is native to South America and inhabits lowlands from southern Mexico to central Argentina and Uruguay. This grasshopper feeds and lays eggs on species from the genera Eichhornia and Pontederia. Particularly, Eichhorni...
Guardado en:
| Publicado: |
2014
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15362442_v14_n_p_Romero http://hdl.handle.net/20.500.12110/paper_15362442_v14_n_p_Romero |
| Aporte de: |
| id |
paper:paper_15362442_v14_n_p_Romero |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_15362442_v14_n_p_Romero2023-06-08T16:20:14Z Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions chromosome rearrangement morphometric variation semiaquatic grasshopper sex dimorphism Acrididae Cornops aquaticum Eichhornia Eichhornia crassipes Elodea Orthoptera Pontederia animal Argentina biometry body size Caelifera comparative study female insect chromosome karyotype male phylogeography physiology river sexual development Animals Argentina Biometry Body Size Chromosomes, Insect Female Grasshoppers Karyotype Male Phylogeography Rivers Sex Characteristics The water-hyacinth grasshopper Cornops aquaticum (Bruner) (Orthoptera: Acrididae) is native to South America and inhabits lowlands from southern Mexico to central Argentina and Uruguay. This grasshopper feeds and lays eggs on species from the genera Eichhornia and Pontederia. Particularly, Eichhornia crassipes is considered "the world's worst water weed," and the release of C. aquaticum was proposed as a form of biological control. Morphometric variation on the chromosomally differentiated populations from the middle and lower Paraná River and its possible association with geographic, sex, and chromosomal conditions was analyzed. Significant phenotype variation in C. aquaticum population was detected. C. aquaticum presents body-size sexual dimorphism, females being bigger than males. Female-biased sexual size dimorphism for all five analyzed traits was detected. The assessment of variation in sexual size dimorphism for tegmen length showed that this trait scaled allometrically, indicating that males and females did not vary in a similar fashion. The detected allometry was consistent with Rensch's rule demonstrating greater evolutionary divergence in male size than in female size and suggests that males are more sensitive to environmental condition. The analysis of morphometric variation in the context of chromosome constitution showed that the presence of fusion 1/6 was related to body-size variation. Fusion carriers displayed bigger body size than standard homozygotes. Besides, a positive relationship between tegmen length and the number of fused chromosomes was detected, showing a chromosome dose effect. Because the highest frequency of fusions has been found in the lower Paraná River, a marginal environment for this species, 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. © 2014 The Author. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15362442_v14_n_p_Romero http://hdl.handle.net/20.500.12110/paper_15362442_v14_n_p_Romero |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
chromosome rearrangement morphometric variation semiaquatic grasshopper sex dimorphism Acrididae Cornops aquaticum Eichhornia Eichhornia crassipes Elodea Orthoptera Pontederia animal Argentina biometry body size Caelifera comparative study female insect chromosome karyotype male phylogeography physiology river sexual development Animals Argentina Biometry Body Size Chromosomes, Insect Female Grasshoppers Karyotype Male Phylogeography Rivers Sex Characteristics |
| spellingShingle |
chromosome rearrangement morphometric variation semiaquatic grasshopper sex dimorphism Acrididae Cornops aquaticum Eichhornia Eichhornia crassipes Elodea Orthoptera Pontederia animal Argentina biometry body size Caelifera comparative study female insect chromosome karyotype male phylogeography physiology river sexual development Animals Argentina Biometry Body Size Chromosomes, Insect Female Grasshoppers Karyotype Male Phylogeography Rivers Sex Characteristics Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| topic_facet |
chromosome rearrangement morphometric variation semiaquatic grasshopper sex dimorphism Acrididae Cornops aquaticum Eichhornia Eichhornia crassipes Elodea Orthoptera Pontederia animal Argentina biometry body size Caelifera comparative study female insect chromosome karyotype male phylogeography physiology river sexual development Animals Argentina Biometry Body Size Chromosomes, Insect Female Grasshoppers Karyotype Male Phylogeography Rivers Sex Characteristics |
| description |
The water-hyacinth grasshopper Cornops aquaticum (Bruner) (Orthoptera: Acrididae) is native to South America and inhabits lowlands from southern Mexico to central Argentina and Uruguay. This grasshopper feeds and lays eggs on species from the genera Eichhornia and Pontederia. Particularly, Eichhornia crassipes is considered "the world's worst water weed," and the release of C. aquaticum was proposed as a form of biological control. Morphometric variation on the chromosomally differentiated populations from the middle and lower Paraná River and its possible association with geographic, sex, and chromosomal conditions was analyzed. Significant phenotype variation in C. aquaticum population was detected. C. aquaticum presents body-size sexual dimorphism, females being bigger than males. Female-biased sexual size dimorphism for all five analyzed traits was detected. The assessment of variation in sexual size dimorphism for tegmen length showed that this trait scaled allometrically, indicating that males and females did not vary in a similar fashion. The detected allometry was consistent with Rensch's rule demonstrating greater evolutionary divergence in male size than in female size and suggests that males are more sensitive to environmental condition. The analysis of morphometric variation in the context of chromosome constitution showed that the presence of fusion 1/6 was related to body-size variation. Fusion carriers displayed bigger body size than standard homozygotes. Besides, a positive relationship between tegmen length and the number of fused chromosomes was detected, showing a chromosome dose effect. Because the highest frequency of fusions has been found in the lower Paraná River, a marginal environment for this species, 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. © 2014 The Author. |
| title |
Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| title_short |
Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| title_full |
Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| title_fullStr |
Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| title_full_unstemmed |
Morphometric differentiation in cornops aquaticum (Orthoptera: Acrididae): Associations with sex, chromosome, and geographic conditions |
| title_sort |
morphometric differentiation in cornops aquaticum (orthoptera: acrididae): associations with sex, chromosome, and geographic conditions |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15362442_v14_n_p_Romero http://hdl.handle.net/20.500.12110/paper_15362442_v14_n_p_Romero |
| _version_ |
1768542856832614400 |