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Masello JF, Quillfeldt P, Sandoval-Castellanos E, Alderman R, Calderón L, Cherel Y, Cole TL, Cuthbert RJ, Marin M, Massaro M, Navarro J, Phillips RA, Ryan PG, Shepherd LD, Suazo CG, Weimerskirch H, Moodley Y. Additive Traits Lead to Feeding Advantage and Reproductive Isolation, Promoting Homoploid Hybrid Speciation. Mol Biol Evol 2020; 36:1671-1685. [PMID: 31028398 PMCID: PMC6657733 DOI: 10.1093/molbev/msz090] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Speciation through homoploid hybridization (HHS) is considered extremely rare in animals. This is mainly because the establishment of reproductive isolation as a product of hybridization is uncommon. Additionally, many traits are underpinned by polygeny and/or incomplete dominance, where the hybrid phenotype is an additive blend of parental characteristics. Phenotypically intermediate hybrids are usually at a fitness disadvantage compared with parental species and tend to vanish through backcrossing with parental population(s). It is therefore unknown whether the additive nature of hybrid traits in itself could lead successfully to HHS. Using a multi-marker genetic data set and a meta-analysis of diet and morphology, we investigated a potential case of HHS in the prions (Pachyptila spp.), seabirds distinguished by their bills, prey choice, and timing of breeding. Using approximate Bayesian computation, we show that the medium-billed Salvin's prion (Pachyptila salvini) could be a hybrid between the narrow-billed Antarctic prion (Pachyptila desolata) and broad-billed prion (Pachyptila vittata). Remarkably, P. salvini's intermediate bill width has given it a feeding advantage with respect to the other Pachyptila species, allowing it to consume a broader range of prey, potentially increasing its fitness. Available metadata showed that P. salvini is also intermediate in breeding phenology and, with no overlap in breeding times, it is effectively reproductively isolated from either parental species through allochrony. These results provide evidence for a case of HHS in nature, and show for the first time that additivity of divergent parental traits alone can lead directly to increased hybrid fitness and reproductive isolation.
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Affiliation(s)
- Juan F Masello
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Germany
| | - Petra Quillfeldt
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Germany
| | | | - Rachael Alderman
- Department of Primary Industries, Parks, Water and Environment, Hobart, TAS, Australia
| | - Luciano Calderón
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Germany
| | - Yves Cherel
- Centre d'Etudes Biologiques de Chizé, UMR 7372 CNRS-Université de La Rochelle, Villiers-en-Bois, France
| | - Theresa L Cole
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Germany.,Manaaki Whenua Landcare Research, Canterbury, New Zealand
| | - Richard J Cuthbert
- Royal Society for the Protection of Birds (RSPB), The Lodge, Sandy, Bedfordshire, United Kingdom
| | - Manuel Marin
- Section of Ornithology, Natural History Museum of Los Angeles County, Los Angeles, CA.,Feather Link Inc., Cincinnati, OH
| | - Melanie Massaro
- Institute for Land, Water and Society, School of Environmental Sciences, Charles Sturt University, Albury, NSW, Australia
| | - Joan Navarro
- Institut de Ciències del Mar CSIC, Barcelona, Spain
| | - Richard A Phillips
- British Antarctic Survey, Natural Environment Research Council, High Cross, Cambridge, United Kingdom
| | - Peter G Ryan
- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, Rondebosch, Republic of South Africa
| | - Lara D Shepherd
- Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand
| | - Cristián G Suazo
- Department of Animal Ecology & Systematics, Justus Liebig University Giessen, Germany
| | - Henri Weimerskirch
- Centre d'Etudes Biologiques de Chizé, UMR 7372 CNRS-Université de La Rochelle, Villiers-en-Bois, France
| | - Yoshan Moodley
- Department of Zoology, University of Venda, Private Bag X5050, Thohoyandou 0950, Republic of South Africa
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Wallace SJ, Morris-Pocock JA, González-Solís J, Quillfeldt P, Friesen VL. A phylogenetic test of sympatric speciation in the Hydrobatinae (Aves: Procellariiformes). Mol Phylogenet Evol 2016; 107:39-47. [PMID: 27693526 DOI: 10.1016/j.ympev.2016.09.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Revised: 07/22/2016] [Accepted: 09/28/2016] [Indexed: 10/20/2022]
Abstract
Phylogenetic relationships among species can provide insight into how new species arise. For example, careful consideration of both the phylogenetic and geographic distributions of species in a group can reveal the geographic models of speciation within the group. One such model, sympatric speciation, may be more common than previously thought. The Hydrobatinae (Aves: Procellariformes) is a diverse subfamily of Northern Hemisphere storm-petrels for which the taxonomy is unclear. Previous studies showed that Hydrobates (formally Oceanodroma) castro breeding in the Azores during the cool season is sister species to H. monteiroi, a hot season breeder at the same locations, which suggests sympatric speciation by allochrony. To test whether other species within the subfamily arose via sympatric speciation by allochrony, we sequenced the cytochrome b gene and five nuclear introns to estimate a phylogenetic tree using multispecies coalescent methods, and to test whether species breeding in the same geographic area are monophyletic. We found that speciation within the Hydrobatinae appears to have followed several geographic modes of divergence. Sympatric seasonal species in Japan likely did not arise through sympatric speciation, but allochrony may have played a role in the divergence of H. matsudairae, a cool season breeder, and H. monorhis, a hot season breeder. No other potential cases of sympatric speciation were discovered within the subfamily. Despite breeding in the same geographic area, hydrobatine storm-petrels breeding in Baja California (H. microsoma and H. melania) are each sister to a species breeding off the coast of Peru (H. tethys and H. markhami, respectively). In fact, antitropical sister species appear to have diverged at multiple times, suggesting allochronic divergence might be common. In addition, allopatry has likely played a role in divergence of H. furcata, a north Pacific breeder, and H. pelagius, a north Atlantic breeder. This study demonstrates that a variety of mechanisms of divergence have played a role in generating the diversity of the Hydrobatinae and supports the current taxonomy of the subfamily.
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Affiliation(s)
- S J Wallace
- Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - J A Morris-Pocock
- Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - J González-Solís
- Institut de Recerca de la Biodiversitat (IRBio) and Dept. Biologia Evolutiva, Ecologia i Ciències Ambientals, Universitat de Barcelona, Barcelona, Spain
| | - P Quillfeldt
- Department of Animal Ecology & Systematics, Justus Liebig University, Giessen, Germany
| | - V L Friesen
- Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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