Fred Ruhe
Well-known member
Antoine Louchart, Fabiola Bastian, Marilia Baptista, Perle Guarino‐Vignon, Julian P. Hume, Cécile Jacot‐des‐Combes, Cécile Mourer‐Chauviré, Catherine Hänni & Morgane Ollivier, 2018
Ancient DNA reveals the origins, colonization histories, and evolutionary pathways of two recently extinct species of giant scops owl from Mauritius and Rodrigues Islands (Mascarene Islands, south‐western Indian Ocean)
Journal of Biogeography. in press. doi:10.1111/jbi.13450
Abstract: https://onlinelibrary.wiley.com/doi/abs/10.1111/jbi.13450
Aim
The islands of the south‐western Indian Ocean region are home to many endemic bird species, with their closest relatives occurring in Africa and Madagascar, Eurasia, the Sunda Islands, and the Australasian region. Among owls, the extant endemic scops owls (genus Otus) from Madagascar, Comoros, Seychelles, and Socotra are related to the Southeast Asian species, O. sunia, the Oriental scops owl. Three owl species, presumably Otus derivatives, twice the size of standard scops owls and now extinct, once inhabited the Mascarene Islands, and have been placed in a separate genus, Mascarenotus. Insular apomorphies have made their precise relationships difficult to determine. Here we investigate the phylogenetic position of these enigmatic owls.
Location
The Mascarene Islands (Réunion, Mauritius, Rodrigues) in the south‐western Indian Ocean.
Methods
Phylogenetic relationships were reconstructed using ancient DNA extracted from subfossil remains. Fragments of cytochrome b gene were amplified and sequenced. The ancient sequences were analysed with modern sequences of 19 ingroup Otus taxa using Bayesian and Maximum Likelihood methods.
Results
The Mauritian extinct species M. sauzieri was reconstructed as the sister to both O. pauliani (Grand Comoro) and O. rutilus (Madagascar). The Rodrigues extinct species M. murivorus was the sister, in a star‐like differentiation, to the preceding clade as well as the remaining Comorian species and a clade formed by O. insularis (Seychelles) and O. sunia.
Main conclusions
The ancestor of O. sunia simultaneously colonized Rodrigues Island (evolving into Otus murivorus), Madagascar, and part of the Comoros Islands around 3 million years ago. Later, presumably from Madagascar, new lineages colonized Grand Comoro and Mauritius (O. sauzieri). Independently, a more recent O. sunia ancestor colonized the Seychelles Islands and Socotra. These colonizations were probably favoured by Pliocene cyclonic events, stronger and more frequent than today. Several features, including giantism, wing reduction, and a relative decrease in skull and orbit size evolved convergently in the polyphyletic species O. sauzieri and O. murivorus.
I know Melanie already mentioned this paper on the Bird Taxonomy and Nomenclature
https://www.birdforum.net/showthread.php?t=159031&page=5 but I think it should be on this subforum
Taxonomic changes:
Mascarenotus sauzieri (Newton et Gadow, 1893).,
Mascarenotus grucheti Mourer-Chauviré, Bour, Moutou et Ribes, 1994 and
Mascarenotus murivorus (Milne-Edwards, 1873). Are transferred from Mascarenotus Mourer-Chauviré, Bour, Moutou et Ribes, 1994 to Otus Pennant, 1769.
Enjoy,
Fred
Ancient DNA reveals the origins, colonization histories, and evolutionary pathways of two recently extinct species of giant scops owl from Mauritius and Rodrigues Islands (Mascarene Islands, south‐western Indian Ocean)
Journal of Biogeography. in press. doi:10.1111/jbi.13450
Abstract: https://onlinelibrary.wiley.com/doi/abs/10.1111/jbi.13450
Aim
The islands of the south‐western Indian Ocean region are home to many endemic bird species, with their closest relatives occurring in Africa and Madagascar, Eurasia, the Sunda Islands, and the Australasian region. Among owls, the extant endemic scops owls (genus Otus) from Madagascar, Comoros, Seychelles, and Socotra are related to the Southeast Asian species, O. sunia, the Oriental scops owl. Three owl species, presumably Otus derivatives, twice the size of standard scops owls and now extinct, once inhabited the Mascarene Islands, and have been placed in a separate genus, Mascarenotus. Insular apomorphies have made their precise relationships difficult to determine. Here we investigate the phylogenetic position of these enigmatic owls.
Location
The Mascarene Islands (Réunion, Mauritius, Rodrigues) in the south‐western Indian Ocean.
Methods
Phylogenetic relationships were reconstructed using ancient DNA extracted from subfossil remains. Fragments of cytochrome b gene were amplified and sequenced. The ancient sequences were analysed with modern sequences of 19 ingroup Otus taxa using Bayesian and Maximum Likelihood methods.
Results
The Mauritian extinct species M. sauzieri was reconstructed as the sister to both O. pauliani (Grand Comoro) and O. rutilus (Madagascar). The Rodrigues extinct species M. murivorus was the sister, in a star‐like differentiation, to the preceding clade as well as the remaining Comorian species and a clade formed by O. insularis (Seychelles) and O. sunia.
Main conclusions
The ancestor of O. sunia simultaneously colonized Rodrigues Island (evolving into Otus murivorus), Madagascar, and part of the Comoros Islands around 3 million years ago. Later, presumably from Madagascar, new lineages colonized Grand Comoro and Mauritius (O. sauzieri). Independently, a more recent O. sunia ancestor colonized the Seychelles Islands and Socotra. These colonizations were probably favoured by Pliocene cyclonic events, stronger and more frequent than today. Several features, including giantism, wing reduction, and a relative decrease in skull and orbit size evolved convergently in the polyphyletic species O. sauzieri and O. murivorus.
I know Melanie already mentioned this paper on the Bird Taxonomy and Nomenclature
https://www.birdforum.net/showthread.php?t=159031&page=5 but I think it should be on this subforum
Taxonomic changes:
Mascarenotus sauzieri (Newton et Gadow, 1893).,
Mascarenotus grucheti Mourer-Chauviré, Bour, Moutou et Ribes, 1994 and
Mascarenotus murivorus (Milne-Edwards, 1873). Are transferred from Mascarenotus Mourer-Chauviré, Bour, Moutou et Ribes, 1994 to Otus Pennant, 1769.
Enjoy,
Fred
