Intraspecific genetic structure of white sucker (Catostomus commersoni) in northeastern North America as revealed by mitochondrial DNA polymorphism

1997 ◽  
Vol 54 (3) ◽  
pp. 555-565 ◽  
Author(s):  
P Lafontaine ◽  
J J Dodson
Keyword(s):  
Mitochondrial Dna ◽  
Genetic Structure ◽  
North America ◽  
Drainage System ◽  
Population Level ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Northeastern North America ◽  
Mitochondrial Dna Polymorphism ◽  
Length Polymorphisms

Restriction fragment length polymorphisms in mitochondrial DNA (mtDNA) were used to study the influence of Pleistocene glaciations on the intraspecific genetic structure and distribution of the white sucker (Catostomus commersoni) in northeastern North America. A total of 312 white sucker from 13 populations, including a population of dwarf ecotypes (Catostomus commersoni utawana), were analysed. An average of 93 fragments per individual and 40 haplotypes were generated by nine restriction endonucleases. Four discrete clades were identified but the majority of the genotypes found (70%) were not associated with any of the clades. The phylogenetic continuity and the geographic admixture of some of the few clades identified are associated with the extensive distribution of the species south of the ice sheets during Pleistocene glaciation events. Hierarchical analysis of the variability in mtDNA revealed a significant regional subdivision to the northwest and southeast of the St. Lawrence drainage system and significant structure at the population level. As the dwarf form exhibited a haplotype identical to that found among normal forms, we tentatively conclude sympatric divergence as the most likely origin of the dwarf and normal ecotypes sampled in the Adirondacks.

scholarly journals Evidence for mitochondrial DNA polymorphism and uniparental inheritance in the cellular slime mold Polysphondylium pallidum: effect of intraspecies mating on mitochondrial DNA transmission.

Genetics ◽  
1990 ◽  
Vol 124 (3) ◽  
pp. 607-613
Author(s):  
M Mirfakhrai ◽  
Y Tanaka ◽  
K Yanagisawa
Keyword(s):  
Mitochondrial Dna ◽  
Slime Mold ◽  
Cellular Slime Mold ◽  
Uniparental Inheritance ◽  
Mating Types ◽  
Mitochondrial Inheritance ◽  
Mitochondrial Dna Polymorphism ◽  
Polysphondylium Pallidum ◽  
Length Polymorphisms ◽  
Cellular Slime

Abstract Restriction fragment length polymorphisms (RFLPs) were used as markers to monitor mitochondrial inheritance in the cellular slime mold, Polysphondylium pallidum. When two opposite mating types (mat1 and mat2) of closely related strains were crossed, all the haploid progeny regardless of mating type inherited their mitochondrial DNA from the mat2 parent only. When opposite mating types from more distantly related strains were crossed, most of the progeny also inherited their mitochondrial DNA from the mat2 parent, but some inherited their mitochondrial DNA from the mat1 parent. In both cases however, the transmission of mitochondrial DNA was uniparental, since in every individual progeny only one type of mitochondrial DNA exists. Moreover, in crosses involving more distantly related strains all the progeny of a single macrocyst were shown to contain the same type of mitochondrial DNA. These findings are discussed in regard to mechanisms of transmission and the possible involvement of nuclear genes in the control of transmission of mitochondrial DNA in Polysphondylium.

scholarly journals Phylogenetic Relationships among Palearctic and Nearctic Whitefish (Coregonus sp.) Populations as Revealed by Mitochondrial DNA Variation

1994 ◽  
Vol 51 (S1) ◽  
pp. 240-251 ◽  
Author(s):  
Louis Bernatchez ◽  
Julian J. Dodson
Keyword(s):  
Mitochondrial Dna ◽  
North America ◽  
Alpine Lakes ◽  
Secondary Contact ◽  
Phylogenetic Groups ◽  
Dna Variation ◽  
Mtdna Variation ◽  
Length Polymorphisms ◽  
Secondary Intergradation ◽  
Geographic Separation

We recently documented the existence of two highly distinct mitochondrial DNA (mtDNA) phylogenetic groups of Coregonus sp. in Beringia in the absence of geographic separation. To test whether this resulted from secondary intergradation of two groups that evolved in allopatry in Eurasia and Beringia, mtDNA restriction-fragment-length polymorphisms of 210 whitefish representing 22 populations from Europe and Siberia were compared with mtDNA variation observed among 581 fish from North America. Results confirmed that Beringia represents a zone of secondary contact among endemic whitefish and a group of Eurasian origin. All Beringian populations clustered much more closely to Eurasian populations than other North American ones. We also compared mtDNA variation among Palearctic populations with that observed in North America. European populations clustered into two major mtDNA groups that exhibited a strong geographic pattern of distribution, independent of the morphological variation observed among populations: one dominated all the more northern populations and extended to Alaska–Yukon; the second largely dominated samples from central alpine lakes, and was absent from Beringia. These results suggest that central alpine lakes and northern Europe were postglacially recolonized by two genetically distinct white-fish groups that most likely evolved in allopatry followed by limited intergradation.

scholarly journals Taxonomic Implications of Morphological and Genetic Differences in Northeastern Coyotes (Coywolves) (Canis latrans × C. lycaon), Western Coyotes (C. latrans), and Eastern Wolves (C. lycaon or C. lupus lycaon)

2013 ◽  
Vol 127 (1) ◽  
pp. 1 ◽  
Author(s):  
Jonathan G. Way
Keyword(s):  
Mitochondrial Dna ◽  
North America ◽  
Body Mass ◽  
Canis Latrans ◽  
The Body ◽  
Hybrid Origin ◽  
Gray Wolf ◽  
Same Sex ◽  
Northeastern North America ◽  
Eastern Wolf

The eastern Coyote or Coywolf (Canis latrans × C. lycaon) inhabiting northeastern North America resulted from hybridization between the expanding population of the western Coyote (Canis latrans) and the remnant population of Eastern Wolf (C. lycaon) and possibly domestic dogs (C. lupus familiaris) in the early 20th century. This study compares the body mass of eastern (i.e., northeastern) Coyotes, western Coyotes, and Eastern Wolves and synthesizes the recent literature to gain better insight into the taxonomic relations and differences of closely-related Canis species. Northeastern Coyotes (males = 16.5 kg; females = 14.7 kg) were statistically (P < 0.0001) intermediate in mass between western Coyotes (males = 12.2 kg; females = 10.7 kg) and Eastern Wolves (males = 28.2 kg, females = 23.7 kg), consistent with their hybrid origin, but were numerically closer to western Coyotes. Large Cohen’s d (3.00–8.56), (0.915–0.929), and Cohen’s f (3.28–3.62) values indicated large effect sizes from the body mass comparisons. Eastern Wolves were 61–71% heavier than the same sex in the northeastern Coyotes, which in turn were ca. 35–37% heavier than the same sex in the western Coyotes. Alternatively, western Coyotes were 73–74% of the size of the same sex in the northeastern Coyotes, which in turn were 59–62% of the size of the same sex in the Eastern Wolves. I also attempted to relate mitochondrial DNA (mtDNA) haplotypes to body mass. Six of 17 (35.3%) adult female northeastern Coyotes captured in Massachusetts weighed ≥18 kg, heavier than any other described Coyote from outside northeastern North America. Mitochondrial DNA haplotypes associated with these heavy female northeastern canids were C9 = 4, C19 = 1, and C48 = 1. Body mass (kg) and mtDNA haplotype data of 53 northeastern Coyotes (males = 28, females = 25) showed no difference between haplotype and body mass for males (P < 0.852) or females (P < 0.128), suggesting that there is not a particular haplotype (e.g., C1) that is associated with the heavier animals. I propose that the most appropriate name for this hybrid animal is Coywolf (Canis latrans × C. lycaon), rather than a type of Coyote. Coywolves are distinct, being larger than any other population of Coyotes but smaller than Eastern Wolves. I propose that the 5 distinct types of Canis be recognized as: western Coyote, Coywolf (northeastern Coyote), Eastern Wolf (including Red Wolf C. rufus), Gray × Eastern Wolf hybrids (‘Great Lakes’ Wolves; C. lupus × C. lycaon or C. lycaon × C. lupus), and Gray Wolf (C. lupus). The implications for wolf recovery in the northeastern United States is discussed.

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