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5 results for “hybrid viability”
Data for: Tracking hybrid viability across life-stages in a natural avian contact zone
<p><span>Hybrid inviability is an important post-zygotic reproductive barrier between species, but emerging signs of reduced viability can be difficult to study across the lifespan of natural hybrids.</span><span> We use a combination of long-term monitoring, extra-pair paternity and mitochondrial DNA identification in a natural hybrid zone of <em>Ficedula </em>flycatchers to detect emerging signs of intrinsic hybrid inviability across their entire lifespan. We evaluate possible evidence of Darwin's corollary to Haldane's rule, predicting asymmetries in inviability between hybrids resulting from reciprocal crosses, due to incompatible genetic factors with sex-specific inheritance patterns. We found higher hatching failure among mixed-species pairs, possibly indicating early developmental impairments associated with specific parental genetic combinations. Adult hybrids had a higher basal mortality rate than both parental species, and different age-specific mortality trajectories. There were signs of differences in age-independent mortality rates between the reciprocal hybrid crosses: hybrids with a pied flycatcher mother experienced slightly increased mortality later in life. Using an exceptional dataset with many natural hybrids tracked across life stages, we provide evidence for several emerging signs of reduced hybrid viability. Incompatibilities between alleles located on autosomes and uniparentally inherited factors such Z-linked and/or mitochondrial genes are strong candidates underlying intrinsic hybrid dysfunction in this system.</span></p>
Data for: Tracking hybrid viability across life-stages in a natural avian contact zone
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Fig 2 from: Mckean NE, Trewick SA, Griffin MJ, Dowle EJ, Morgan-Richards M (2018) Viability and fertility of hybrid New Zealand tree wētā Hemideina spp. (Orthoptera: Anostostomatidae). Journal of Orthoptera Research 27(2): 97-106. https://doi.org/10.3897/jor.27.14963
Fig 2 A. Tibia length of adult female F1 hybrids compared with adult females from the two parent species, showing no significant difference; B. Tibia length of F1 hybrid males compared with males of the two parent species, showing a significant difference: p-value = 0.0001.
Fig 1 from: Mckean NE, Trewick SA, Griffin MJ, Dowle EJ, Morgan-Richards M (2018) Viability and fertility of hybrid New Zealand tree wētā Hemideina spp. (Orthoptera: Anostostomatidae). Journal of Orthoptera Research 27(2): 97-106. https://doi.org/10.3897/jor.27.14963
Fig 1 Distribution of the three North Island New Zealand species of tree wētā (Hemideina) and an H. thoracica × H. crassidens F1 hybrid. The distributions of the species were taken from Morgan-Richards and Wallis (2003) and Morgan-Richards (2000).
The Assessment Of Myocardial Viability Based On CTA/MRI Hybrid Models
ClinicalTrials.gov study NCT04397198. IPD Sharing: YES. Countries: 1. Publications: 0.
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