LACK OF CLONAL VARIATION AMONG CANADIAN POPULATIONS OF THE CORN LEAF APHID, RHOPALOSIPHUM MAIDIS FITCH (HOMOPTERA: APHIDIDAE)

1995 ◽  
Vol 127 (5) ◽  
pp. 623-629 ◽  
Author(s):  
J.C. Simon ◽  
P.D.N. Hebert ◽  
C. Carillo ◽  
R. De Melo
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
North America ◽  
North Africa ◽  
Allozyme Variation ◽  
Clonal Variation ◽  
Allozyme Analysis ◽  
Rhopalosiphum Maidis ◽  
Mtdna Variation ◽  
Corn Leaf Aphid

AbstractThe extent of allozyme variation and the amount of genetic divergence were assessed among populations of the aphid Rhopalosiphum maidis in Ontario. Allozyme analysis of individuals from 12 sites revealed no polymorphism for 32 loci. In addition, the extent of karyotypic, allozyme, and mitochondrial DNA (mtDNA) variation was examined for clones from North America, Europe, and North Africa. As previously noted, chromosome number varied in relation to the host-plant on which aphids were collected, but neither allozyme nor mtDNA patterns allowed discrimination among clones. Further work is needed to determine whether the lack of genetic diversity in R. maidis is linked with its recent introduction to North America or with its loss of a sexual phase.

Allozyme variation in populations of Lacerta raddei and Lacerta nairensis (Sauria: Lacertidae) from Armenia

1996 ◽  
Vol 17 (3) ◽  
pp. 233-246 ◽  
Author(s):  
Darlene E. Upton ◽  
Felix D. Danielyan ◽  
Michèle L. Bobyn ◽  
Ilya S. Darevsky ◽  
Robert W. Murphy ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
Allozyme Variation ◽  
The Other ◽  
Separate Species ◽  
Allelic Differences ◽  
Allozyme Loci ◽  
And Behavior

AbstractLacertca raddei and Lacerta nairensis have been recognized as two separate species based on morphology and behavior, and each has been implicated as a sexual parent of different parthenogenetic forms. However, recent mitochondrial DNA work failed to distinguish these two as separate species. We examined genetic diversity at 36 allozyme loci from six populations of L. nairensis and four populations of L. raddei. There were no fixed allelic differences between the two. Mean heterozygosity was slightly higher among populations of L. raddei than among populations of L. nairensis. A Distance Wagner phenogram showed that the northernmost population of L. raddei clustered with the L. nairensis populations; the other L. raddei populations clustered together. We suggest that L. raddei and L. nairensis may not be separate species, a finding which has important implications for determining the origins of some parthenogenetic Lacerta.

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.

Phylogeography and genetic diversity of Psammophis schokari (Serpentes) in North Africa based on mitochondrial DNA sequences

2007 ◽  
Vol 42 (1) ◽  
pp. 112-117 ◽  
Author(s):  
C. Rato ◽  
J. C. Brito ◽  
M. A. Carretero ◽  
S. Larbes ◽  
B. Shacham ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
North Africa ◽  
Dna Sequences

Phylogeography and genetic diversity ofPsammophis schokari(Serpentes) in North Africa based on mitochondrial DNA sequences

2007 ◽  
Vol 42 (1) ◽  
pp. 112-117 ◽  
Author(s):  
C. Rato ◽  
J. C. Brito ◽  
M. A. Carretero ◽  
S. Larbes ◽  
B. Shacham ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
North Africa ◽  
Dna Sequences

Allozyme Variation and Population Substructuring in the Caucasian Ground Lizards Lacerta derjugini and Lacerta praticola

2011 ◽  
Vol 4 (2) ◽  
pp. 115-119 ◽  
Author(s):  
Ross D. MacCulloch ◽  
Ilya S. Darevsky ◽  
Robert W. Murphy ◽  
Jinzhong Fu
Keyword(s):  
Genetic Diversity ◽  
Allozyme Variation ◽  
Close Proximity ◽  
Geographic Separation ◽  
Population Substructuring ◽  
Allozyme Loci ◽  
Two Populations

Genetic diversity at 35 allozyme loci was surveyed in Lacerta derjugini (3 populations) and L. praticola (2 populations). Indices of variability were consistent with those found in other Caucasian Lacerta. There was little genetic substructuring between two populations of L. praticola despite considerable geographic separation. Conversely, populations of L. derjugini in close proximity to one another exhibited considerable substructuring.

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