Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect?
Abstract Recent multilocus studies of congeneric birds have shown a pattern of elevated interspecific divergence on the Z chromosome compared to the autosomes. In contrast, intraspecifically, birds exhibit less polymorphism on the Z chromosome relative to the autosomes. We show that the four black‐a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2012-02-01
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| Series: | Ecology and Evolution |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ece3.92 |
| _version_ | 1797797908345520128 |
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| author | Silje Hogner Stein A. Sæther Thomas Borge Torbjørn Bruvik Arild Johnsen Glenn‐Peter Sætre |
| author_facet | Silje Hogner Stein A. Sæther Thomas Borge Torbjørn Bruvik Arild Johnsen Glenn‐Peter Sætre |
| author_sort | Silje Hogner |
| collection | DOAJ |
| description | Abstract Recent multilocus studies of congeneric birds have shown a pattern of elevated interspecific divergence on the Z chromosome compared to the autosomes. In contrast, intraspecifically, birds exhibit less polymorphism on the Z chromosome relative to the autosomes. We show that the four black‐and‐white Ficedula flycatcher species show greater genetic divergence on the Z chromosome than on the autosomes, and that the ratios of intraspecific polymorphism at Z‐linked versus autosomal markers are below the neutral expectation of 75%. In all species pairs, we found more fixed substitutions and fewer shared polymorphisms on the Z chromosome than on the autosomes. Finally, using isolation with migration (IMa) models we estimated gene flow among the four closely related flycatcher species. The results suggest that different pattern of evolution of Z chromosomes and autosomes is best explained by the faster‐Z hypothesis, since the estimated long‐term gene flow parameters were close to zero in all comparisons. |
| first_indexed | 2024-03-13T03:55:27Z |
| format | Article |
| id | doaj.art-f717593caa96410ca4651a056ba1cce0 |
| institution | Directory Open Access Journal |
| issn | 2045-7758 |
| language | English |
| last_indexed | 2024-03-13T03:55:27Z |
| publishDate | 2012-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj.art-f717593caa96410ca4651a056ba1cce02023-06-22T06:50:39ZengWileyEcology and Evolution2045-77582012-02-012237939610.1002/ece3.92Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect?Silje Hogner0Stein A. Sæther1Thomas Borge2Torbjørn Bruvik3Arild Johnsen4Glenn‐Peter Sætre5National Centre for Biosystematics, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, NO‐0318 Oslo, Norway.Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P. O. Box 1066, Blindern, N‐0316 Oslo, Norway.Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P. O. Box 1066, Blindern, N‐0316 Oslo, Norway.Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P. O. Box 1066, Blindern, N‐0316 Oslo, Norway.National Centre for Biosystematics, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, NO‐0318 Oslo, Norway.Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, P. O. Box 1066, Blindern, N‐0316 Oslo, Norway.Abstract Recent multilocus studies of congeneric birds have shown a pattern of elevated interspecific divergence on the Z chromosome compared to the autosomes. In contrast, intraspecifically, birds exhibit less polymorphism on the Z chromosome relative to the autosomes. We show that the four black‐and‐white Ficedula flycatcher species show greater genetic divergence on the Z chromosome than on the autosomes, and that the ratios of intraspecific polymorphism at Z‐linked versus autosomal markers are below the neutral expectation of 75%. In all species pairs, we found more fixed substitutions and fewer shared polymorphisms on the Z chromosome than on the autosomes. Finally, using isolation with migration (IMa) models we estimated gene flow among the four closely related flycatcher species. The results suggest that different pattern of evolution of Z chromosomes and autosomes is best explained by the faster‐Z hypothesis, since the estimated long‐term gene flow parameters were close to zero in all comparisons.https://doi.org/10.1002/ece3.92Allopatrycongeneric birdsfaster‐Z hypothesisnuclear intronsZ chromosome polymorphism |
| spellingShingle | Silje Hogner Stein A. Sæther Thomas Borge Torbjørn Bruvik Arild Johnsen Glenn‐Peter Sætre Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? Ecology and Evolution Allopatry congeneric birds faster‐Z hypothesis nuclear introns Z chromosome polymorphism |
| title | Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? |
| title_full | Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? |
| title_fullStr | Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? |
| title_full_unstemmed | Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? |
| title_short | Increased divergence but reduced variation on the Z chromosome relative to autosomes in Ficedula flycatchers: differential introgression or the faster‐Z effect? |
| title_sort | increased divergence but reduced variation on the z chromosome relative to autosomes in ficedula flycatchers differential introgression or the faster z effect |
| topic | Allopatry congeneric birds faster‐Z hypothesis nuclear introns Z chromosome polymorphism |
| url | https://doi.org/10.1002/ece3.92 |
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