Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before
Deviation from formal null models and the comparisons between age classes are amongst the most direct methods of demonstrating ongoing natural selection. We have sampled 207 males from a population of the grasshopper Leptysma argentina at the onset and the end of the adult life span for this species...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00180661_v133_n3_p189_Colombo http://hdl.handle.net/20.500.12110/paper_00180661_v133_n3_p189_Colombo |
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paper:paper_00180661_v133_n3_p189_Colombo2023-06-08T14:39:16Z Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before Colombo, Pablo Cesar animal cell animal experiment article biological model cell synchronization cell viability chromosome polymorphism controlled study fusion gene gene frequency genetic analysis genetic heterogeneity grasshopper heterosis heterozygote homozygote karyotyping lifespan male natural population natural selection nonhuman Orthoptera population genetics supernumerary chromosome survival time Animals Chromosomes Genetics, Population Germ Cells Grasshoppers Heterozygote Homozygote Karyotyping Male Models, Genetic Polymorphism, Genetic Selection (Genetics) Animalia Insecta Leptysma Leptysma argentina Orthoptera Deviation from formal null models and the comparisons between age classes are amongst the most direct methods of demonstrating ongoing natural selection. We have sampled 207 males from a population of the grasshopper Leptysma argentina at the onset and the end of the adult life span for this species; generations are synchronical and do not overlap. The karyotypic frequencies for a fusion (F) and a supernumerary segment (s1) were examined. The young male sample was heterogeneous and did not fit to the Hardy-Weinberg proportions, whereas the aged male sample did not deviate from H-W expectations in both analyses. Likewise, the young male sample showed fitness heterosis for the s1 carriers that are fusion homozygotes. We interpreted the significant results of karyotype frequency in both samples as the result of survival selection. Evidently natural selection acts on male adult viability as well as on other fitness components prior to adult survival, thus changing karyotype frequencies between generations. Likewise, we also detected a strong interaction between polymorphisms, whereas heterosis for s1 heterozygotes might be contributing to the maintenance of the s1 polymorphism. The actual target of selection remains unidentified. Fil:Colombo, P.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00180661_v133_n3_p189_Colombo http://hdl.handle.net/20.500.12110/paper_00180661_v133_n3_p189_Colombo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
animal cell animal experiment article biological model cell synchronization cell viability chromosome polymorphism controlled study fusion gene gene frequency genetic analysis genetic heterogeneity grasshopper heterosis heterozygote homozygote karyotyping lifespan male natural population natural selection nonhuman Orthoptera population genetics supernumerary chromosome survival time Animals Chromosomes Genetics, Population Germ Cells Grasshoppers Heterozygote Homozygote Karyotyping Male Models, Genetic Polymorphism, Genetic Selection (Genetics) Animalia Insecta Leptysma Leptysma argentina Orthoptera |
| spellingShingle |
animal cell animal experiment article biological model cell synchronization cell viability chromosome polymorphism controlled study fusion gene gene frequency genetic analysis genetic heterogeneity grasshopper heterosis heterozygote homozygote karyotyping lifespan male natural population natural selection nonhuman Orthoptera population genetics supernumerary chromosome survival time Animals Chromosomes Genetics, Population Germ Cells Grasshoppers Heterozygote Homozygote Karyotyping Male Models, Genetic Polymorphism, Genetic Selection (Genetics) Animalia Insecta Leptysma Leptysma argentina Orthoptera Colombo, Pablo Cesar Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| topic_facet |
animal cell animal experiment article biological model cell synchronization cell viability chromosome polymorphism controlled study fusion gene gene frequency genetic analysis genetic heterogeneity grasshopper heterosis heterozygote homozygote karyotyping lifespan male natural population natural selection nonhuman Orthoptera population genetics supernumerary chromosome survival time Animals Chromosomes Genetics, Population Germ Cells Grasshoppers Heterozygote Homozygote Karyotyping Male Models, Genetic Polymorphism, Genetic Selection (Genetics) Animalia Insecta Leptysma Leptysma argentina Orthoptera |
| description |
Deviation from formal null models and the comparisons between age classes are amongst the most direct methods of demonstrating ongoing natural selection. We have sampled 207 males from a population of the grasshopper Leptysma argentina at the onset and the end of the adult life span for this species; generations are synchronical and do not overlap. The karyotypic frequencies for a fusion (F) and a supernumerary segment (s1) were examined. The young male sample was heterogeneous and did not fit to the Hardy-Weinberg proportions, whereas the aged male sample did not deviate from H-W expectations in both analyses. Likewise, the young male sample showed fitness heterosis for the s1 carriers that are fusion homozygotes. We interpreted the significant results of karyotype frequency in both samples as the result of survival selection. Evidently natural selection acts on male adult viability as well as on other fitness components prior to adult survival, thus changing karyotype frequencies between generations. Likewise, we also detected a strong interaction between polymorphisms, whereas heterosis for s1 heterozygotes might be contributing to the maintenance of the s1 polymorphism. The actual target of selection remains unidentified. |
| author |
Colombo, Pablo Cesar |
| author_facet |
Colombo, Pablo Cesar |
| author_sort |
Colombo, Pablo Cesar |
| title |
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| title_short |
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| title_full |
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| title_fullStr |
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| title_full_unstemmed |
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). IV. Survival selection acts on karyotype polymorphisms at the adult stage and before |
| title_sort |
chromosome polymorphisms and natural selection in leptysma argentina (orthoptera). iv. survival selection acts on karyotype polymorphisms at the adult stage and before |
| publishDate |
2000 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00180661_v133_n3_p189_Colombo http://hdl.handle.net/20.500.12110/paper_00180661_v133_n3_p189_Colombo |
| work_keys_str_mv |
AT colombopablocesar chromosomepolymorphismsandnaturalselectioninleptysmaargentinaorthopteraivsurvivalselectionactsonkaryotypepolymorphismsattheadultstageandbefore |
| _version_ |
1768546427693170688 |