Allozyme and Mitochondrial DNA Variation among Three Species of Stizostedion (Percidae): Phylogenetic and Zoogeographical Implications

1990 ◽  
Vol 47 (6) ◽  
pp. 1093-1102 ◽  
Author(s):  
Neil Billington ◽  
Paul D. N. Hebert ◽  
Robert D. Ward
Keyword(s):  
Mitochondrial Dna ◽  
North America ◽  
Late Pleistocene ◽  
Genetic Relatedness ◽  
North American Species ◽  
Divergence Times ◽  
Before Present ◽  
Allozyme Data ◽  
Dna Variation ◽  
The North

The percid genus Stizostedion consists of five species, three in Europe and two in North America, and is believed to have evolved in Europe and then later colonized North America. Three hypotheses exist concerning the route and timing of this colonization: a Miocene Atlantic "riverine" route; a Pliocene Beringian route; and a late-Pleistocene Atlantic route. To test these hypotheses, allozyme and mitochondrial DNA variation were compared in three Stizostedion species, S. canadense and S. vitreum from North America, and S. lucioperca from Europe, to determine their genetic relatedness. Divergence times between S. canadense and S. vitreum were estimated as 3.12 ± 1.33 million years before present (MYBP) from allozyme data and 4.06 ± 0.73 MYBP for mtDNA data, while divergence times between the North American species and S. lucioperca were 10.59 ± 2.74 MYBP and 7.86 ± 1.18 MYBP, respectively. These results are concordant with the hypothesis that colonization of North America by Stizostedion occurred during the Pliocene via Beringia.

scholarly journals Low Mitochondrial DNA Variation in Double-crested Cormorants in Eastern North America

Waterbirds ◽  
2003 ◽  
Vol 26 (2) ◽  
pp. 196 ◽  
Author(s):  
Juliann L. Waits ◽  
Michael L. Avery ◽  
Mark E. Tobin ◽  
Paul L. Leberg
Keyword(s):  
Mitochondrial Dna ◽  
North America ◽  
Eastern North America ◽  
Dna Variation

A Carved Stone from D'Arcy, Saskatchewan

1940 ◽  
Vol 5 (4) ◽  
pp. 334-335
Author(s):  
Vladimar Alfred Vigfusson
Keyword(s):  
North America ◽  
Late Pleistocene ◽  
Glacial Lake ◽  
Bering Strait ◽  
The North ◽  
Gravel Pit ◽  
North Bank ◽  
The Town

In recent years, the attention of some archaeologists has been directed to the Canadian Northwest with the expectation of finding some evidence or indication of the early migrations of man on this continent. That man reached North America by Bering Strait from Asia, is generally accepted, but the theory that the migrations took place in late Pleistocene times and by way of an open corridor between the Keewatin ice and the Rockies, requires confirmation. It is significant that Folsom and Yuma points from Saskatchewan, described by E. B. Howard, were found mainly in areas bordering the ancient glacial Lake Regina.As a further contribution to this problem, it seems desirable to present a brief description of a carved stone relic found in gravel in central Saskatchewan about three years ago.The stone was found about seven miles southeast of the town of D'Arcy in a gravel pit located on Sec. 9, Tp. 28, Rge. 18, W. 3rd Meridian, on the north bank of a ravine running east into Bad Lake.

The North American Species in Group X of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (8) ◽  
pp. 803-809 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
North America ◽  
North American ◽  
North American Species ◽  
The North ◽  
Variable Species ◽  
Ips Calligraphus

AbstractIps calligraphus (Germar), I. ponderosae Swaine and I. interstitialis (Eichhoff) represent one variable species with the oldest name, Ips calligraphus (Germar) taking precedence. Ips calligraphus can always be recognized by the six spines on each side of the declivity. All other species in North America have less than six spines on each side.

Comparison of Allozyme and Mitochondrial DNA Variation in Populations of Walleye, Stizostedion vitreum

1989 ◽  
Vol 46 (12) ◽  
pp. 2074-2084 ◽  
Author(s):  
Robert D. Ward ◽  
Neil Billington ◽  
Paul D. N. Hebert
Keyword(s):  
Mitochondrial Dna ◽  
Glacial Refugia ◽  
Divergence Times ◽  
Stizostedion Vitreum ◽  
Dna Variation ◽  
Mtdna Variation ◽  
Mtdna Haplotypes ◽  
Total Genetic Diversity ◽  
Allozyme Loci ◽  
Organelle Genes

Twelve populations of walleye (Stizostedion vitreum) from the Great Lakes and three populations from northern Manitoba were screened for allozyme and mitochondrial DNA (mtDNA) variation. Nine enzyme loci known to show genetic variation were screened in all fish: five of them (Prot-4, Prot-2, Mdh-3, Idh-1, Adh) showed appreciable polymorphism. MtDNA was examined in all fish using six endonucleases that detected polymorphic sites and a further 13 endonucleases that detected only monomorphic sites. Only one of the allozyme loci (Prot-4) showed evidence of geographic patterning of allele frequencies. By contrast, the mtDNA haplotypes showed clear geographic variation. The proportion of total genetic diversity attributable to population differentiation (Gst) was three to five times greater for mtDNA than for the allozymes. Gst values for organelle genes are expected on theoretical grounds to be greater than for nuclear genes, and this expected difference may be enhanced in walleye because of the likelihood that, in this species, male-mediated gene flow exceeds that of females. The distributions of mtDNA haplotypes and estimated divergence times are consistent with the derivation of extant walleye populations from three different glacial refugia.

The Natural Groups of Species in the Genus Ips De Geer (Coleoptera: Scolytidae) in North America

1963 ◽  
Vol 95 (5) ◽  
pp. 508-516 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
North America ◽  
North American ◽  
Related Species ◽  
North American Species ◽  
Closely Related Species ◽  
The North ◽  
The World ◽  
Group Relationships ◽  
Natural Groups

AbstractThe genus Ips is one of four closely related genera in the tribe Ipini, sub-tribe Ipina (De Geer 1775, Balachowsky 1949, Nunberg 1954, Hopping 1963). There are now 32 species of Ips recognized in North America, with a few more as yet undescribed. This paper defines the groups of closely related species with observations on the group relationships of species from other parts of the world. Work is in progress to define the North American species in each group.

A New Gunnel, Pholis clemensi, from the Coast of Western North America

1964 ◽  
Vol 21 (5) ◽  
pp. 933-939 ◽  
Author(s):  
Richard H. Rosenblatt
Keyword(s):  
British Columbia ◽  
New Species ◽  
North America ◽  
North American ◽  
North American Species ◽  
Western North America ◽  
The North ◽  
The Family ◽  
Juan De Fuca ◽  
A New Species

A new species, Pholis clemensi, referred to the family Pholidae, is named and described from 12 specimens taken in southern British Columbia waters and the Strait of Juan de Fuca. Pholis clemensi is compared with other members of the genus, and a key is given to the North American species.

scholarly journals Notes on the biology and distribution of the tribe Agallissini in North America (Coleoptera: Cerambycidae: Cerambycinae)

Zootaxa ◽  
2018 ◽  
Vol 4457 (3) ◽  
pp. 444
Author(s):  
THOMAS AUSTIN ◽  
DANIEL HEFFERN ◽  
ROBERT GEMMILL ◽  
BRIAN RABER ◽  
MIKE QUINN
Keyword(s):  
North America ◽  
North American ◽  
North American Species ◽  
Distribution Maps ◽  
The North ◽  
Larval Host

New distributional records, new larval host records, various collecting notes, and observations are reported for the North American species of the tribe Agallissini LeConte, 1873 (Coleoptera: Cerambycidae: Cerambycinae): Agallissus lepturoides (Duponchel & Chevrolat, 1841), Osmopleura chamaeropis (Horn, 1893), and Zagymnus clerinus (LeConte, 1873). The species are illustrated and distribution maps are provided.

scholarly journals THE NORTH AMERICAN SPECIES OF PEDILOPHORUS

1903 ◽  
Vol 35 (6) ◽  
pp. 179-182
Author(s):  
H. F. Wickham
Keyword(s):  
North America ◽  
North American ◽  
North American Species ◽  
The West ◽  
Mountain Ranges ◽  
The North

The Byrrhidæ of this continent have received a comparatively small share of attention at the hands of systematists for many years, so that it is not at all surprising to find novelties among recently-collected material. Two new forms of the genus Pedilophorus have recently been detected among the accumulations in my cabinet, both of them from the west; no doubt still others remain to reward explorers of the mountain ranges and of the northern districts. The European fauna contains ten species, while but four were previously known from North America.

A review of the North American species of Aptilotus, with descriptions of new species from North America and Nepal (Diptera: Sphaeroceridae)

1990 ◽  
Vol 68 (11) ◽  
pp. 2338-2351 ◽  
Author(s):  
S. A. Marshall ◽  
Ian P. Smith
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
North American Species ◽  
New Combinations ◽  
The North ◽  
First Time

All macropterous species of Aptilotus Mik are keyed, with descriptions of two new macropterous North American species, Aptilotus pogophallus and A. nigriphallus. New distributional records are given for other North American species, and brachyptery is noted for the first time in A. luctuosus (Spuler). Four new macropterous species of Aptilotus (glabrifrons, spinistylus, rufiscapus, and binotatus are described from Nepal. The relationships between the North American and Nepalese species are discussed. Minocellina Papp is synonomized with Aptilotus, and the two species formerly in Minocellina, A. thaii (Papp) and A. besucheti (Papp), are thus given as new combinations. Limosina carbonicolor Richards, from Ethiopia, is redescribed and transferred to Aptilotus.

The genus Odontocepheus (Acari: Oribatida: Carabodidae) in North America, with description of a new species

1995 ◽  
Vol 73 (11) ◽  
pp. 1983-1990 ◽  
Author(s):  
R. Marcel Reeves
Keyword(s):  
New Species ◽  
North America ◽  
West Virginia ◽  
Leaf Litter ◽  
North American ◽  
North American Species ◽  
The North ◽  
Rotten Wood ◽  
A New Species

Adults of Odontocepheus rumbleseatus n.sp. are described, the second Odontocepheus species known from North America. An unusual, deep posterior depression on the notogaster easily separates this species from all others in the genus Odontocepheus. Specimens were collected from hardwood leaf litter and rotten wood. The known distribution is Illinois and West Virginia south to northern Florida. Additional characters for separating the North American species O. oblongus (Banks) from O. elongatus (Michael) in Europe are presented, and the presence of O. elongatus in North America is documented.

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