Synonymization of Gyrodactylus labradorius Hanek and Threlfall, 1970 with G. bairdi Wood and Mizelle, 1957 (Monogenea)

1983 ◽  
Vol 61 (5) ◽  
pp. 1138-1141 ◽  
Author(s):  
D. K. Cone ◽  
M. Wiles
Keyword(s):  
North America ◽  
Intraspecific Variation ◽  
Yukon Territory ◽  
Geographical Range ◽  
Marginal Hooklet ◽  
Cottus Bairdi ◽  
Shape And Size

This study compares Gyrodactylus bairdi Wood and Mizelle, 1957 from Cottus bairdi Girard in Indiana and C. cognatus Richardson in the Yukon Territory to G. labradorius Hanek and Threlfall, 1970 from C. bairdi in Labrador. The marginal hooklet sickles in the two species are identical in shape and size. The hamuli are similarly shaped and slight differences in overall size of the haptoral sclerites can be attributed to intraspecific variation. It is concluded that G. labradorius is a synonym of G. bairdi, and that G. bairdi, so consolidated, is distributed throughout most of the geographical range of freshwater cottids in North America.

A Migratory Cariboo Convention

1981 ◽  
Vol 18 ◽  
pp. 285-300
Author(s):  
N. D. Bankes
Keyword(s):  
United States ◽  
Open Access ◽  
North America ◽  
Oil And Gas ◽  
Operative Management ◽  
The United States ◽  
Yukon Territory ◽  
Gas Drilling ◽  
Barren Ground ◽  
The Creation

Over the last decade several proposals have been made for the creation of an international wildlife range between northeast Alaska and northern Yukon Territory, and for a convention between Canada and the United States to regulate the Porcupine caribou herd. The herd, one of the largest barren ground caribou herds in North America, regularly migrates across the United States-Canadian boundary. It is harvested in both countries by Indians and Inuit. Since the vitality of the caribou herd may be affected by developments on either side of the border, such as overharvesting, construction of pipelines or highways, influx of tourists, open access hunting policies, and oil and gas drilling, the herd requires co-operative management.

Flake Tools in the American Arctic: Some Speculations

1964 ◽  
Vol 29 (3) ◽  
pp. 338-344 ◽  
Author(s):  
Edwin N. Wilmsen
Keyword(s):  
North America ◽  
Central Asia ◽  
New World ◽  
Yukon Territory ◽  
River Delta ◽  
The Arctic ◽  
Land Bridge ◽  
Bering Land Bridge

AbstractTwo sites, Kogruk (at the summit of Anaktuvuk Pass, Alaska) and Engigstciak (at the head of the Firth River delta, Yukon Territory, Canada), have recently yielded flake-tool assemblages which show striking resemblances to a Eurasiatic flake-blade tradition based on a Levallois-Mousterian stone-chipping technique, and to the Clovis flake-blade tradition of America which appears to be based on a similar chipping technique. It is suggested that these traditions are historically related and that the Arctic sites provide a possible link between the two. The presence of incipient fluting in Siberia and at Engigstciak may prove significant. Dating is discussed in terms of the ecology and geology of the sites and is correlated with the probable periods of availability of the Bering land bridge. An upland-foothills zone is seen to be essentially continuous from central Asia to central North America. It is suggested that this zone provided the only environmentally compatible link between the two continents, and that it was therefore the most probable route of early hunting peoples into the New World.

scholarly journals First Records of the Northern Long-eared Bat, Myotis septentrionalis, in the Yukon Territory

2006 ◽  
Vol 120 (1) ◽  
pp. 39 ◽  
Author(s):  
Thomas S. Jung ◽  
Brian G. Slough ◽  
David W. Nagorsen ◽  
Tanya A. Dewey ◽  
Todd Powell
Keyword(s):  
Population Structure ◽  
North America ◽  
Adult Male ◽  
Yukon Territory ◽  
River Valley ◽  
Myotis Septentrionalis ◽  
Northwestern North America

Three adult male Northern Long-eared Bats, Myotis septentrionalis, were captured in mist nets in July 2004 in the LaBiche River Valley, southeastern Yukon. These are the first records of M. septentrionalis in the Yukon. Further survey work is needed to delineate the extent of the range and population structure of this and other species of bats in northwestern North America.

Identification and morphology of the aecial state of Pucciniastrum sparsum in northwestern Canada

1970 ◽  
Vol 48 (3) ◽  
pp. 433-435
Author(s):  
Y. Hiratsuka
Keyword(s):  
North America ◽  
Northwest Territories ◽  
Picea Glauca ◽  
Yukon Territory ◽  
New Hosts ◽  
First Time

From inoculation experiments and morphological examinations, the aecial state of Pucciniastrum sparsum (Wint.) E. Fisch. (= Thekopsora sparsa (Wint.) Magn.) has been identified for the first time in North America from specimens collected in the Northwest Territories and the Yukon Territory. Picea glauca (Moench) Voss, P. mariana (Mill.) BSP., and P. pungens Engelm. (from inoculation only) are reported as new hosts of this fungus. An expanded description of the spermogonia and aecia of the fungus is given.

scholarly journals Intraspecific Variation in a Scorpionfly Newly Recorded from Texas and the State of Taxonomy of North American Panorpidae (Mecoptera)

2010 ◽  
Vol 2010 ◽  
pp. 1-5
Author(s):  
Joshua R. Jones
Keyword(s):  
North America ◽  
Intraspecific Variation ◽  
North American ◽  
Original Description ◽  
The State ◽  
Taxonomic Review ◽  
Intraspecific Variations ◽  
First Time

Panorpa vernalisByers is recorded for the first time from Texas, and represents only the second species ofPanorpadocumented from the state. Intraspecific variations between the Texas specimens and Byers' original description are discussed. A synopsis of the principal modern keys for identification of North AmericanPanorpais provided, and an argument for a modern taxonomic review of the Panorpidae of North America is presented.

Intraspecific Variation in the rDNA Its Loci of 37-Collar-Spined Echinostomes from North America: Implications for Sequence-Based Diagnoses and Phylogenetics

1998 ◽  
Vol 84 (5) ◽  
pp. 992 ◽  
Author(s):  
R. E. Sorensen ◽  
J. Curtis ◽  
D. J. Minchella
Keyword(s):  
North America ◽  
Intraspecific Variation ◽  
Rdna Its

Taxonomy of trypanosomes (Protozoa: Trypanosomatidae) ofSpermophilusspp. (Rodentia: Sciuridae)

Parasitology ◽  
1972 ◽  
Vol 65 (3) ◽  
pp. 403-425 ◽  
Author(s):  
Donald F. J. Hilton ◽  
Jerome L. Mahrt
Keyword(s):  
North America ◽  
Host Species ◽  
Yukon Territory ◽  
Ground Squirrels ◽  
The Other ◽  
Experimental Infections ◽  
Spermophilus Columbianus

(1)Spermophilus columbianus, S. franklinii, S. lateralis tescorum, S. richardsonii, S. tridecemlineatusands. undulatus plesius(ground squirrels) were collected from Alberta and Yukon Territory (S. u. plesiusonly), Canada. Trypanosome infections were detected in all butS. l. tescorum. (2) All six species of squirrels were experimentally inoculated with trypanosomes from naturally infectedS. columbianus, S. franklinii, S. richardsoniiandS. tridecemlineatus. The strains fromS. columbianus, S. richardsoniiandS. tridecemlineatusproduced infections in some or all of the other host species, whereas the strain fromS. frankliniidid not. (3) Natural transmission of trypanosomes has not been demonstrated, but it seems likely that fleas act as vectors. (4) Intensities and durations of experimental infections were variable and depended upon the trypanosome strain, host species and individual. Infections were non-pathogenic. (5) Previously infected ground squirrels could not be reinfected with the same or a different trypanosome strain and immunity appeared to be lifelong. (6) Size comparisons among and within trypanosome strains from naturally and experimentally infected ground squirrels revealed that the strains fromS. frankliniiandS. tridecemlineatuswere similar to one another, but different from the other three trypanosome strains (those fromS. columbianus, S. richardsoniiandS. undulatus). (7) It is suggested that there is only one species of trypanosome,Trypanosoma otospermophili, in the genusSpermophilusin North America and that differences in size and types of infection are due to host-induced variations (i.e. they are plastoxenodemes).T. spermophili(present in EurasianSpermophilusspp.) might be synonymous withT. otospermophili.

A new species and taxonomic notes on northern Nearctic Cerodontha (Icteromyza) (Diptera: Agromyzidae)

2008 ◽  
Vol 140 (5) ◽  
pp. 557-562 ◽  
Author(s):  
Stéphanie Boucher
Keyword(s):  
New Species ◽  
North America ◽  
Yukon Territory ◽  
Palaearctic Species ◽  
Northern Canada ◽  
First Time ◽  
A New Species

AbstractCerodontha (Icteromyza) pilosan. sp. is described from the Yukon Territory. The Palaearctic species C. (I.) lineella (Zetterstedt) is recorded for the first time in North America, based on specimens from northern Canada and Alaska, and C. (I.) pollinosa (Melander) is synonymized with C. lineella. Cerodontha pilosa is most similar to C. (I.) longipennis (Loew) and C. (I.) lineella. Distinguishing characters and a modification of Spencer’s key to Canadian species of Cerodontha are given to separate these species.

The biology of Canadian weeds. 128. Leucanthemum vulgare Lam.

2004 ◽  
Vol 84 (1) ◽  
pp. 343-363 ◽  
Author(s):  
David R. Clements ◽  
Dan E. Cole ◽  
Jane King ◽  
Alec McClay
Keyword(s):  
British Columbia ◽  
North America ◽  
Yukon Territory ◽  
Perennial Herb ◽  
Old Fields ◽  
Western Canada ◽  
Far North ◽  
Pasture Quality ◽  
Ray Florets ◽  
Noxious Weed

Leucanthemum vulgare Lam. (Asteraceae), known as ox-eye daisy, is a familiar perennial herb with white ray florets and yellow disc florets. It commonly inhabits roadside ver ges, pastures and old fields from Newfoundland to British Columbia, and also as far north as the Yukon Territory. Introduced from Europe, L. vulgare was well established in North America by 1800. The Canadian distribution of L. vulgare has expanded in many areas recently, particularly in western Canada. It can form dense populations that may reduce diversity of natural vegetation or pasture quality, and also serves as a host and reservoir for several species of polyphagous gall-forming Meloidogyne nematodes that feed on crops. It is considered a noxious weed under provincial legislation in Quebec, Manitoba, Alberta and British Columbia, as well as under the Canada Seeds Act. Control efforts are sometimes complicated by difficulties in distinguishing ox-eye daisy from some forms of the commercially available Shasta daisy ( L. × superbum).

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