scholarly journals The French Colonial Legacy of the Canada–United States Border in Eastern North America, 1650–1783

2009 ◽  
Vol 10 (1) ◽  
pp. 35-54 ◽  
Author(s):  
Paul A. Demers
Keyword(s):  
United States ◽  
North America ◽  
Eastern North America ◽  
Colonial Legacy ◽  
French Colonial

Distribution of the middorsal stripe dimorphism in the wood frog, Rana sylvatica, in eastern North America

1980 ◽  
Vol 58 (9) ◽  
pp. 1643-1651 ◽  
Author(s):  
Frederick W. Schueler ◽  
Francis R. Cook
Keyword(s):  
United States ◽  
North America ◽  
Rana Sylvatica ◽  
Wood Frog ◽  
Eastern North America ◽  
Hudson Bay ◽  
Northeastern United States ◽  
Southern Ontario ◽  
Maritime Canada ◽  
Eurasian Species

The frequency of the middorsally striped morph of Rana sylvatica in Ontario and Manitoba varies from absence in southern Ontario to 80% on the coast of Hudson Bay, with a general value of 20–30% in the boreal forest, a rise to 50% on the forest–grassland ecotone in southern Manitoba, and a decline westward to 20% on the edge of the prairies. This morph is rare in the northeastern United States and Maritime Canada. The suggested relationship between its frequency and the "grassiness" of the background on which predators view it is reexamined, and it is suggested that a linkage with earlier transformation as demonstrated in Eurasian species may explain certain anomalies.

A comparison of earthquake damage areas as a function of magnitude across the United States

1993 ◽  
Vol 83 (4) ◽  
pp. 1064-1080 ◽  
Author(s):  
G. A. Bollinger ◽  
M. C. Chapman ◽  
M. S. Sibol
Keyword(s):  
United States ◽  
North America ◽  
Ground Motion ◽  
Epicentral Distance ◽  
The United States ◽  
Western United States ◽  
Eastern North America ◽  
Similar Response ◽  
Eastern United States ◽  
The West

Abstract This study investigates the relationship between earthquake magnitude and the size of damage areas in the eastern and western United States. To quantify damage area as a function of moment magnitude (M), 149 MMI VI and VII areas for 109 earthquakes (88 in the western United States, 21 in the eastern United States and Canada) were measured. Regression of isoseismal areas versus M indicated that areas in the East were larger than those in the West, at both intensity levels, by an average 5 × in the M 4.5 to 7.5 range. In terms of radii for circles of equivalent area, these results indicate that damaging ground motion from shocks of the same magnitude extend 2 × the epicentral distance in eastern North America compared to the West. To determine source and site parameters consistent with the above results, response spectral levels for eastern North America were stochastically simulated and compared with response spectral ordinates derived from recorded strong ground motion data in the western United States. Stress-drop values of 200 bars, combined with a surficial 2-km-thick low velocity “sedimentary” layer over rock basement, produced results that are compatible with the intensity observations, i.e., similar response spectral levels in the east at approximately twice their epicentral distance in the western U.S. distance. These results suggest that ground motion modeling in eastern North America may need to incorporate source and site parameters different from those presently in general use. The results are also of importance to eastern U.S. hazard assessments as they require allowance for the larger damage areas in preparedness and mitigation programs.

Lithocolletis blancardella Fabricius (Lepidoptera: Gracilariidae) on Apple in Eastern North America with Notes on Other Species Occurring on Rosaceae

1964 ◽  
Vol 96 (11) ◽  
pp. 1442-1449 ◽  
Author(s):  
H. T. Stultz
Keyword(s):  
United States ◽  
North America ◽  
Leaf Miner ◽  
Eastern North America ◽  
Similar Species ◽  
Black Cherry ◽  
Northeastern United States ◽  
Maritime Provinces ◽  
Eastern Canada ◽  
Large Numbers

AbstractA spotted tentiform leaf miner, often present during recent years in large numbers in apple orchards in the Maritime Provinces of Canada, is identified as Lithocolletis blancardella Fabr., a species common on apples in Europe. Recent collecting indicates that the species occurs widely in Eastern Canada and the northeastern United States. Diagnostic characters, especially those of the male genitalia, are compared with those of specimens identified as L. crataegella Clem. and L. propinquinella Braun, two similar species which commonly occur on apple and black cherry respectively.

scholarly journals Impacts of the North Atlantic Oscillation on Winter Precipitations and Storm Track Variability in Southeast Canada and Northeast US

2020 ◽  
Author(s):  
Julien Chartrand ◽  
Francesco Salvatore Rocco Pausata
Keyword(s):  
United States ◽  
North America ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Storm Track ◽  
The United States ◽  
Eastern North America ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract. The North Atlantic Oscillation (NAO) affects atmospheric variability from eastern North America to Europe. Although the link between the NAO and winter precipitations in the eastern North America have been the focus of previous work, only few studies have hitherto provided clear physical explanations on these relationships. In this study we revisit and extend the analysis of the effect of the NAO on winter precipitations over a large domain covering southeast Canada and the northeastern United States. Furthermore, here we use the recent ERA5 reanalysis dataset (1979–2018), which currently has the highest available horizontal resolution for a global reanalysis (0.25°), to track extratropical cyclones to delve into the physical processes behind the relationship between NAO and precipitation, snowfall, snowfall-to-precipitation ratio (S/P), and snow cover depth anomalies in the region. In particular, our results show that positive NAO phases are associated with less snowfall over a wide region covering Nova Scotia, New England and the Mid-Atlantic of the United States relative to negative NAO phases. Henceforth, a significant negative correlation is also seen between S/P and the NAO over this region. This is due to a decrease (increase) in cyclogenesis of coastal storms near the United States east coast during positive (negative) NAO phases, as well as a northward (southward) displacement of the mean storm track over North America.

scholarly journals Redescription of Arundel formation Ornithomimosaur material and a reinterpretation of Nedcolbertia justinhofmanni as an “Ostrich Dinosaur”: Biogeographic implications

2016 ◽  
Author(s):  
Chase Doran Brownstein
Keyword(s):  
United States ◽  
North America ◽  
Early Cretaceous ◽  
Fossil Record ◽  
East Coast ◽  
The United States ◽  
Eastern North America ◽  
New Taxon ◽  
Western North America ◽  
The Past

The fossil record of dinosaurs from the Early Cretaceous of eastern North America is scant, and only a few sediments to the east of the continent are fossiliferous. Among them is the Arundel Formation of the east coast of the United States, which has produced among the best dinosaur faunas known from the Early Cretaceous of eastern North America. The diverse dinosaur fauna of this formation has been thoroughly discussed previously, but few of the dinosaur species originally described from the Arundel are still regarded as valid genera. Much of the Arundel material is in need of review and redescription. Among the fossils of dinosaurs from this formation are those referred to ornithomimosaurs. Here, I redescribe ornithomimosaur remains from the Arundel Formation which may warrant the naming of a new taxon of dinosaur. These remains provide key information on the theropods of the Early Cretaceous of Eastern North America. The description of the Arundel material herein along with recent discoveries of basal ornithomimosaurs in the past 15 years has allowed for comparisons with the coelurosaur Nedcolbertia justinhofmanni, suggesting the latter animal was a basal ornithomimosaurian dinosaur rather than a “generalized” coelurosaur. Comparisons between the Arundel ornithomimosaur and similar southeast Asian ornithomimosaurian material as well as ornithomimosaur remains from western North America suggest that a lineage of ornithomimosaurs with a metatarsal condition intermediate between that of basal and derived ornithomimosaurs was present through southeast Asia into North America, in turn suggesting that such animals coexisted with genera having a more primitive metatarsal morphology as seen in N. justinhofmanni.

Phytophthora ramorum Identified Infecting Eastern Teaberry (Gaultheria procumbens) Plants Shipped to Oregon

2014 ◽  
Vol 15 (1) ◽  
pp. 9-10 ◽  
Author(s):  
N. K. Osterbauer ◽  
S. Lane ◽  
A. Trippe
Keyword(s):  
United States ◽  
North America ◽  
Phytophthora Ramorum ◽  
Eastern North America ◽  
The South ◽  
New Host ◽  
Koch’S Postulates ◽  
Understory Species ◽  
The North ◽  
Gaultheria Procumbens

These results confirm the pathogenicity of Phytophthora ramorum on eastern teaberry and complete Koch's Postulates for this new host. Eastern teaberry is an understory species native to eastern North America, with its range extending from Alabama and Georgia (United States) in the south to Manitoba and Quebec (Canada) in the north. Infected nursery plants represent a potential pathway for P. ramorum introduction to this region. Accepted for publication 22 November 2013. Published 22 January 2014.

William Maclure and the Library of the Academy of Natural Sciences of Philadelphia

2000 ◽  
Vol 19 (1) ◽  
pp. 33-35 ◽  
Author(s):  
John Sinkankas
Keyword(s):  
United States ◽  
North America ◽  
The United States ◽  
Natural Sciences ◽  
Research Note ◽  
Eastern North America ◽  
On Line ◽  
Geological Map ◽  
Academy Of Natural Sciences

William Maclure (1763-1840) established a reputation as a geologist and mineralogist in the United States, based largely on his well-known geological map of eastern North America, published in 1809. This research note discusses the important library of over 5,000 scientific books amassed by Maclure. Many of these books are now in the collection of the Academy of Natural Sciences of Philadelphia. [Editor's note: The on-line catalog of the Academy's library is at http://www.acnatsci.org/library.]

CHIRONOMIDAE (DIPTERA) ASSOCIATED WITH MYRIOPHYLLUM SPICATUM IN OKANAGAN VALLEY LAKES, BRITISH COLUMBIA

1983 ◽  
Vol 115 (11) ◽  
pp. 1545-1546 ◽  
Author(s):  
B.J. Kangasniemi ◽  
D. R. Oliver
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
British Columbia ◽  
North America ◽  
Myriophyllum Spicatum ◽  
The United States ◽  
Eastern North America ◽  
Aquatic Weed ◽  
Okanagan Valley

Eurasian water milfoil, Myriophyllum spicatum Linnaeus, was introduced into eastern North America late in the nineteenth century. It has spread and developed into a major aquatic weed in many areas of the United states and Canada (Aiken et al. 1979; Reed 1977). In British Columbia, it was first observed in the Vernon Arm of Okanagan Lake in 1970 and had spread to all major 1,akes in the Okanagan Valley by 1976 (Newroth 1979).

NEWLY DETECTED EXOTIC SPECIES OF XYLEBORUS (COLEOPTERA: SCOLYTIDAE) WITH A REVISED KEY TO SPECIES IN EASTERN NORTH AMERICA

1990 ◽  
Vol 122 (1) ◽  
pp. 93-104 ◽  
Author(s):  
Thomas H. Atkinson ◽  
Robert J. Rabaglia ◽  
Donald E. Bright
Keyword(s):  
United States ◽  
North America ◽  
Exotic Species ◽  
The United States ◽  
Eastern North America ◽  
Key To Species ◽  
Eastern Asia ◽  
Ambrosia Beetles ◽  
Asian Origin ◽  
Large Numbers

AbstractTwo exotic species of Xyleborus (Coleoptera: Scolytidae) of Asian origin have recently been detected in the United States. Xyleborus pelliculosus Eichhoff has been collected in Pennsylvania and Maryland, and X. atratus Eichhoff from Tennessee, Georgia, Maryland, Virginia, and West Virginia. Descriptions of both species and a revised, illustrated key to members of the genus Xyleborus in eastern North America are presented. An explanation is proposed for the large numbers of recent introductions of exotic ambrosia beetles from eastern Asia into eastern North America.

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