Low Genetic Variability in Paddlefish Populations

Carlson, Douglas M.; Kettler, Michelle K.; Fisher, Suzanne E.; Whitt, Gregory S.

doi:10.2307/1444682

Cited by 38 publications

(32 citation statements)

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“…Although extant Acipenseriformes families may have originated from a tetraploid ancestor with a probable karyotype of 120-macro and micro-chromosomes, it is presumed that the tetraploidization occurred at an early stage during the evolution of the group (Birstein et al, 1997) from an ancestor with 60 chromosomes (Dingerkus & Howell, 1976;Carlson et al, 1982). On the other hand the presence of a karyotype close to 2n = 60 in the most ancient orders, is congruent with other studies.…”

Section: Discussionsupporting

confidence: 86%

Chromosome evolution in fishes: a new challenging proposal from Neotropical species

et al. 2014

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We present a database containing cytogenetic data of Neotropical actinopterygian fishes from Venezuela obtained in a single laboratory for the first time. The results of this study include 103 species belonging to 74 genera assigned to 45 families and 17 out of the 40 teleost orders. In the group of marine fishes, the modal diploid number was 2n=48 represented in 60% of the studied species, while in the freshwater fish group the modal diploid complement was 2n=54, represented in 21.21 % of the studied species. The average number of chromosomes and the mean FN were statistically higher in freshwater fish than in marine fish. The degree of diversification and karyotype variation was also higher in freshwater fish in contrast to a more conserved cytogenetic pattern in marine fish. In contrast to the assumption according to which 48 acrocentric chromosomes was basal chromosome number in fish, data here presented show that there is an obvious trend towards the reduction of the diploid number of chromosomes from values near 2n=60 with high number of biarmed chromosomes in more basal species to 2n=48 acrocentric elements in more derived Actinopterygii.Se presenta una base de datos que contiene los datos citogenéticos de peces Actinopterigios Neotropicales de Venezuela obtenidos por primera vez en un solo laboratorio. Los resultados de este estudio incluyen 103 especies pertenecientes a 74 géneros de 45 familias contenidas en 17 de los 40 órdenes de teleósteos. En el grupo de peces marinos, el número diploide modal fue 2n=48 representado en 60% de las especies estudiadas, mientras que en el grupo de peces de agua dulce el complemento diploide modal fue 2n=54, representado en el 21,21% de las especies estudiadas. El número de cromosomas y FN promedio fueron estadísticamente superiores en peces dulceacuícolas. El grado de diversificación y variación en el cariotipo también fue mayor en peces de agua dulce en contraste con un patrón citogenético más conservado en peces marinos. En contraposición a la suposición según la cual 48 cromosomas acrocentricos era el número cromosómico basal en los peces, los datos aquí presentados muestran que existe una evidente tendencia hacia la reducción del número de cromosomas desde valores cercanos a 2n=60 con alto número de cromosomas birrámeos en las especies más basales a 2n=48 elementos acrocéntricos en los actinopterigios más derivados.

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Section: Discussionsupporting

confidence: 86%

Chromosome evolution in fishes: a new challenging proposal from Neotropical species

et al. 2014

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“…Similar results have been previously demonstrated by protein polymorphism (Carlson et al 1982), mtDNA (Epifanio et al 1996) and microsatellites (Heist and Mustapha 2008). It is documented that the Alabama River drainage has been separated from the Mississippi River drainage for 25 000-30 000 years (Ramsey 1965 * ) and it would be expected that this duration of isolation would result in significant genetic divergence.…”

Section: Discussionsupporting

confidence: 81%

Genetic structure among four populations of paddlefish, Polyodon spathula (Actinopterygii: Acipenseriformes: Polyodontidae), based on disomic microsatellite markers

Zheng¹,

Schneider²,

Lowe³

et al. 2014

Acta Ichthyol. Piscat

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“…Some authors consider that the tetraploidization of 60-chromosome ancestors of contemporary Acipenseriformes occurred about 300 Myr ago, before the radiation of this order (Dingercus & Howell, 1976;Carlson et al, 1982). According to paleontological data, the age of the order Acipenseriformes is only about 200 Myr (Berg, 1955), and the age of the family Acipenseridae, 80 Myr.…”

Section: Discussionmentioning

confidence: 99%

Tetraploid-octoploid relationships and karyological evolution in the order Acipenseriformes (Pisces) karyotypes, nucleoli, and nucleolus-organizer regions in four acipenserid species

Birstein

Vasiliev

1987

Genetica

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The karyotypes of four Acipenseriformes species, Acipenser gueldenstaedti, 2n = 250+_ 8, A. ruthenus, A. stellatus and Huso huso, 2n = 118+_2, are described. In all four karyotypes the majority of chromosomes are meta-and submetacentric macrochromosomes, and microchromosomes of different morphology make up about one third of the set. In A. ruthenus the NORs are located in the telomeric region of a pair of microchromosomes and at least in one pair of middle-size acrocentrics, and in A. stellatus and Huso huso also in the telomeric regions of at least one pair of microchromosomes. The modal number of active nucleoli in A. gueldenstaedti nuclei amounts to 6-8 (range 2-12), in A. ruthenus, A. stellatus and H. huso nuclei to 2-3 (range 1-6). The data obtained point to the tetraploid origin of Acipenseriformes species with 120 chromosomes and to the octoploid origin of species with 240-260 chromosomes.

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Low Genetic Variability in Paddlefish Populations

Cited by 38 publications

References 0 publications

Chromosome evolution in fishes: a new challenging proposal from Neotropical species

Chromosome evolution in fishes: a new challenging proposal from Neotropical species

Genetic structure among four populations of paddlefish, Polyodon spathula (Actinopterygii: Acipenseriformes: Polyodontidae), based on disomic microsatellite markers

Tetraploid-octoploid relationships and karyological evolution in the order Acipenseriformes (Pisces) karyotypes, nucleoli, and nucleolus-organizer regions in four acipenserid species

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