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10 results for “Unisexual Ambystoma”
Fig. 8 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 8. Distribution of Ambystoma jeffersonianum, Ambystoma laterale, and unisexuals in northeastern U.S.
Fig. 7 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 7. Distribution of Ambystoma jeffersonianum, Ambystoma laterale, and unisexuals in Maine, New Hampshire, and Vermont.
Fig. 6 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 6. Distribution of Ambystoma jeffersonianum, Ambystoma laterale, and unisexuals in Connecticut, Massachusetts, and Rhode Island.
Fig. 4 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 4. Distribution of Ambystoma jeffersonianum, Ambystoma laterale, and unisexuals in New Jersey and Pennsylvania.
Fig. 3. Ambystoma jeffersonianum and unisexuals associated with A in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 3. Ambystoma jeffersonianum and unisexuals associated with A. jeffersonianum found in Pennsylvania. Ambystoma jeffersonianum (AMNH 169835) (top), triploid unisexual (LJJ) (AMNH 169828) (middle), and tetraploid LJJJ unisexual (AMNH 169833) (bottom). All are from site 179.
Fig. 2. Ambystoma laterale and unisexuals associated with A in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 2. Ambystoma laterale and unisexuals associated with A. laterale found in Pennsylvania. Ambystoma laterale (AMNH 165901 from site 189) (top), diploid unisexual LJ (AMNH 169928 from site 174) (middle), and triploid unisexual LLJ (AMNH 166022 from site 189) (bottom).
Fig. 1 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 1. Graph of mean (± SD) erythrocyte area for diploid Ambystoma jeffersonianum (JJ), diploid A. laterale (LL), diploid unisexuals (LJ), triploid unisexuals (LJJ, LLJ), and tetraploid unisexuals (LLLJ, LJJJ) from the data in table 7.
Fig. 5 in Additional Distributional Records of Ambystoma laterale, A. jeffersonianum (Amphibia: Caudata) and Their Unisexual Kleptogens in Northeastern North America
Fig. 5. Distribution of Ambystoma jeffersonianum, Ambystoma laterale, and unisexuals in New York.
Data from: Cryptic sex? Estimates of genome exchange in unisexual mole salamanders (Ambystoma sp.)
Cryptic sex has been argued to explain the exceptional longevity of certain parthenogenetic vertebrate lineages, yet direct measurements of genetic exchange between sexual and apparently parthenogenetic forms are rare. Female unisexual mole salamanders (Ambystoma sp.) are the oldest known unisexual vertebrate lineage (~5 million years), and one hypothesis for their persistence is that allopolyploid female unisexuals periodically exchange haploid genomes 'genome exchange' during gynogenetic reproduction with males from sympatric sexual species. We test this hypothesis by using genome-specific microsatellite DNA markers to estimate the rates of genome exchange between sexual males and unisexual females in two ponds in NE Ohio. We also test the prediction that levels of gene flow should be higher for 'sympatric' (sexual males present) genomes in unisexuals compared to 'allopatric' (sexual males absent) unisexual genomes. We used a model testing framework in the coalescent-based program MIGRATE-N to compare models where unidirectional gene flow is present and absent between sexual species and unisexuals. As predicted, our results show higher levels of gene flow between sexuals and sympatric unisexual genomes compared to lower (likely artefactual) levels of gene flow between sexuals and allopatric unisexual genomes. Our results provide direct evidence that genome exchange between sexual and unisexual Ambystoma occurs and demonstrate that the magnitude depends on which sexual species are present. The relatively high levels of gene flow suggest that unisexuals must be at a selective advantage over sexual forms so as to avoid extinction due to genetic swamping through genome exchange.
Data from: Cryptic sex? Estimates of genome exchange in unisexual mole salamanders (Ambystoma sp.)
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