Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms
Trimerotropis pallidipennis is an American grasshopper whose South American populations are polymorphic for pericentric inversions. Colonization of southern latitudes was by North American grasshoppers with basic chromosome arrangements, presumably along the Andean dry lands of South America. In Arg...
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todo:paper_0018067X_v81_n4_p444_Confalonieri2023-10-03T14:15:27Z Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms Confalonieri, V.A. Sequeira, A.S. Todaro, L. Vilardi, J.C. Grasshoppers Inversion polymorphisms Mitochondrial DNA Natural selection Panama Isthmus Phylogeography RFLP Argentina cytogenetics gene rearrangement insect genetics mitochondrial DNA North America phylogeography population genetics South America biogeography colonization environmental gradient grasshopper phylogeny polymorphism population genetics South America Acrididae Orthoptera Trimerotropis pallidipennis Trimerotropis pallidipennis is an American grasshopper whose South American populations are polymorphic for pericentric inversions. Colonization of southern latitudes was by North American grasshoppers with basic chromosome arrangements, presumably along the Andean dry lands of South America. In Argentina, the frequencies of some of the rearrangements are correlated with geographical and climatic variables, following similar patterns among different ecological gradients, and are probably maintained by geographically variable coefficients of selection. Restriction site variation of mitochondrial DNA is used as a tool for determining the species history in relation to the formation of clines. Populations located along an altitudinal gradient, and others outside the cline, are analysed through phylogeographical studies. There is no strong geographical orientation in the unrooted tree connecting all 17 mitochondrial DNA haplotypes found. Many of them are present in most of the populations analysed, indicating high gene flow. The fact that there is no obvious differentiation in haplotype distribution between both extremes of the cline nor between chromosomally differentiated populations shows that the cline is not the result of a hybrid zone and reinforces the selection hypothesis. The estimation of the overall nucleotide divergence between the hypothetical ancestral haplotype and the other molecules shows that T. pallidipennis haplotypes started diverging from each other about 3 Myr ago. This result is in agreement with the time when the Isthmus of Panama rose (2-3 Myr ago), probably favouring the migration of many species between both hemispheres. Fil:Confalonieri, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sequeira, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Todaro, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilardi, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0018067X_v81_n4_p444_Confalonieri |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Grasshoppers Inversion polymorphisms Mitochondrial DNA Natural selection Panama Isthmus Phylogeography RFLP Argentina cytogenetics gene rearrangement insect genetics mitochondrial DNA North America phylogeography population genetics South America biogeography colonization environmental gradient grasshopper phylogeny polymorphism population genetics South America Acrididae Orthoptera Trimerotropis pallidipennis |
| spellingShingle |
Grasshoppers Inversion polymorphisms Mitochondrial DNA Natural selection Panama Isthmus Phylogeography RFLP Argentina cytogenetics gene rearrangement insect genetics mitochondrial DNA North America phylogeography population genetics South America biogeography colonization environmental gradient grasshopper phylogeny polymorphism population genetics South America Acrididae Orthoptera Trimerotropis pallidipennis Confalonieri, V.A. Sequeira, A.S. Todaro, L. Vilardi, J.C. Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| topic_facet |
Grasshoppers Inversion polymorphisms Mitochondrial DNA Natural selection Panama Isthmus Phylogeography RFLP Argentina cytogenetics gene rearrangement insect genetics mitochondrial DNA North America phylogeography population genetics South America biogeography colonization environmental gradient grasshopper phylogeny polymorphism population genetics South America Acrididae Orthoptera Trimerotropis pallidipennis |
| description |
Trimerotropis pallidipennis is an American grasshopper whose South American populations are polymorphic for pericentric inversions. Colonization of southern latitudes was by North American grasshoppers with basic chromosome arrangements, presumably along the Andean dry lands of South America. In Argentina, the frequencies of some of the rearrangements are correlated with geographical and climatic variables, following similar patterns among different ecological gradients, and are probably maintained by geographically variable coefficients of selection. Restriction site variation of mitochondrial DNA is used as a tool for determining the species history in relation to the formation of clines. Populations located along an altitudinal gradient, and others outside the cline, are analysed through phylogeographical studies. There is no strong geographical orientation in the unrooted tree connecting all 17 mitochondrial DNA haplotypes found. Many of them are present in most of the populations analysed, indicating high gene flow. The fact that there is no obvious differentiation in haplotype distribution between both extremes of the cline nor between chromosomally differentiated populations shows that the cline is not the result of a hybrid zone and reinforces the selection hypothesis. The estimation of the overall nucleotide divergence between the hypothetical ancestral haplotype and the other molecules shows that T. pallidipennis haplotypes started diverging from each other about 3 Myr ago. This result is in agreement with the time when the Isthmus of Panama rose (2-3 Myr ago), probably favouring the migration of many species between both hemispheres. |
| format |
JOUR |
| author |
Confalonieri, V.A. Sequeira, A.S. Todaro, L. Vilardi, J.C. |
| author_facet |
Confalonieri, V.A. Sequeira, A.S. Todaro, L. Vilardi, J.C. |
| author_sort |
Confalonieri, V.A. |
| title |
Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| title_short |
Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| title_full |
Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| title_fullStr |
Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| title_full_unstemmed |
Mitochondrial DNA and phylogeography of the grasshopper Trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| title_sort |
mitochondrial dna and phylogeography of the grasshopper trimerotropis pallidipennis in relation to clinal distribution of chromosome polymorphisms |
| url |
http://hdl.handle.net/20.500.12110/paper_0018067X_v81_n4_p444_Confalonieri |
| work_keys_str_mv |
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