The Leptynia hispanica stick-insect species complex includes bisexuals, triploid and tetraploid parthenogenetic populations, suggesting that polyploidy has played a central role in the evolution of this complex. An in-depth analysis of karyotype, mtDNA (cox2) and nuclear DNA (ef1-a) markers was carried out in order to clarify phylogenetic relationships and microevolutionary/phylogeographic patterns of the L. hispanica complex. Our analyses suggested a subdivision of bisexual populations into four groups, tentatively proposed as incipient species. Moreover, triploids and tetraploids showed two independent origins, the latter being more ancient than the former. From ef1-a analysis, triploids showed a clear hybrid constitution, while the hybrid constitution of tetraploids is likely, but more data are needed. We suggest that L. hispanica is a case of “geographic parthenogenesis” with parthenogenetic strains colonizing large peripheral ranges, and bisexuals confined to post-glacial refuge areas. Moreover, the age, wide distribution and competitive advantage of polyploids over diploids, demonstrate their significance in the evolution of the L. hispanica species complex.

F. Ghiselli, L. Milani, V. Scali, M. Passamonti (2007). The Leptynia hispanica species complex (Insecta Phasmida): polyploidy, parthenogenesis, hybridization and more. MOLECULAR ECOLOGY, 16 (20), 4256-4268.

The Leptynia hispanica species complex (Insecta Phasmida): polyploidy, parthenogenesis, hybridization and more.

GHISELLI, FABRIZIO;MILANI, LILIANA;SCALI, VALERIO;PASSAMONTI, MARCO
2007

Abstract

The Leptynia hispanica stick-insect species complex includes bisexuals, triploid and tetraploid parthenogenetic populations, suggesting that polyploidy has played a central role in the evolution of this complex. An in-depth analysis of karyotype, mtDNA (cox2) and nuclear DNA (ef1-a) markers was carried out in order to clarify phylogenetic relationships and microevolutionary/phylogeographic patterns of the L. hispanica complex. Our analyses suggested a subdivision of bisexual populations into four groups, tentatively proposed as incipient species. Moreover, triploids and tetraploids showed two independent origins, the latter being more ancient than the former. From ef1-a analysis, triploids showed a clear hybrid constitution, while the hybrid constitution of tetraploids is likely, but more data are needed. We suggest that L. hispanica is a case of “geographic parthenogenesis” with parthenogenetic strains colonizing large peripheral ranges, and bisexuals confined to post-glacial refuge areas. Moreover, the age, wide distribution and competitive advantage of polyploids over diploids, demonstrate their significance in the evolution of the L. hispanica species complex.
2007
F. Ghiselli, L. Milani, V. Scali, M. Passamonti (2007). The Leptynia hispanica species complex (Insecta Phasmida): polyploidy, parthenogenesis, hybridization and more. MOLECULAR ECOLOGY, 16 (20), 4256-4268.
F. Ghiselli; L. Milani; V. Scali; M. Passamonti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/45513
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