THE WINTER STONEFLIES ALLOCAPNIA GRANULATA (TAENIOPTERYGIDAE), TAENIOPTERYX NIVALIS AND T. PARVULA (CAPNIIDAE) IN SOUTHERN MANITOBA

1978 ◽  
Vol 110 (1) ◽  
pp. 111-112 ◽  
Author(s):  
John F. Flannagan
Keyword(s):  
North America ◽  
River System ◽  
Red River ◽  
Eastern North America ◽  
East Central ◽  
The North ◽  
East And West

Baumann (1976) lists the zoogeographic range of the Nearctic “winter” stonefly genus Allocapnia as being confined to Eastern North America and the Palaearctic genus Taeniopteryx Pictet as being Amphinorth American (i.e. distributed in the east and west of the continent but not in middle). Allocapnia has never been recorded west of Ontario, in Canada, and although present in some of the east-central states of the U.S.A. (Ross and Ricker 1971) has not been collected in the north flowing Red River system. Taeniopteryx is represented on the Prairies by two species, T. parvula Banks recorded from Aweme, Manitoba and T. nivalis (Fitch) from Alberta (Ricker and Ross 1968).

New multituberculate mammal from the Early Cretaceous of eastern North America

2013 ◽  
Vol 50 (3) ◽  
pp. 315-323 ◽  
Author(s):  
Richard L. Cifelli ◽  
Cynthia L. Gordon ◽  
Thomas R. Lipka
Keyword(s):  
North America ◽  
Iberian Peninsula ◽  
Early Cretaceous ◽  
North American ◽  
Lower Cretaceous ◽  
Late Jurassic ◽  
Relative Length ◽  
Central Position ◽  
Eastern North America ◽  
The North

Multituberculates, though among the most commonly encountered mammalian fossils of the Mesozoic, are poorly known from the North American Early Cretaceous, with only one taxon named to date. Herein we describe Argillomys marylandensis, gen. et sp. nov., from the Early Cretaceous of Maryland, based on an isolated M2. Argillomys represents the second mammal known from the Arundel Clay facies of the Patuxent Formation (Lower Cretaceous: Aptian). Though distinctive in its combination of characters (e.g., enamel ornamentation consisting of ribs and grooves only, cusp formula 2:4, presence of distinct cusp on anterobuccal ridge, enlargement of second cusp on buccal row, central position of ultimate cusp in lingual row, great relative length), the broader affinities of Argillomys cannot be established because of non-representation of the antemolar dentition. Based on lack of apomorphies commonly seen among Cimolodonta (e.g., three or more cusps present in buccal row, fusion of cusps in lingual row, cusps strongly pyramidal and separated by narrow grooves), we provisionally regard Argillomys as a multituberculate of “plagiaulacidan” grade. Intriguingly, it is comparable in certain respects to some unnamed Paulchoffatiidae, a family otherwise known from the Late Jurassic – Early Cretaceous of the Iberian Peninsula.

scholarly journals Do Barrow's Goldeneyes, Bucephala islandica, Breed South of the St. Lawrence Estuary in the Gaspé Peninsula, Eastern Canada?

2010 ◽  
Vol 124 (2) ◽  
pp. 179
Author(s):  
Jean-François Ouellet ◽  
Pierre Fradette ◽  
Isabel Blouin
Keyword(s):  
North America ◽  
Breeding Season ◽  
Breeding Habitat ◽  
Eastern North America ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
North Shore ◽  
The North ◽  
Bucephala Islandica ◽  
St Lawrence Estuary

We report the first observations of Barrow's Goldeneyes south of the St. Lawrence estuary in typical breeding habitat during the breeding season. Until recently, the confirmed breeding locations for the species in Eastern North America were all located on the north shore of the Estuary and Gulf of St. Lawrence.

North Hemispheric winter air temperature variability and its linkage to North Pacific and North Atlantic SST modes?

2020 ◽  
Author(s):  
Binhe Luo ◽  
Dehai Luo ◽  
Aiguo Dai ◽  
Lixin Wu
Keyword(s):  
North America ◽  
Air Temperature ◽  
North Atlantic ◽  
North Pacific ◽  
Wave Train ◽  
Surface Air Temperature ◽  
Eastern North America ◽  
The North ◽  
The North Atlantic ◽  
The North Pacific

<p>Winter surface air temperature (SAT) over North America exhibits pronounced variability on sub-seasonal-to-interdecadal timescales, but its causes are not fully understood. Here observational and reanalysis data from 1950-2017 are analyzed to investigate these causes. Detrended daily SAT data reveals a known warm-west/cold-east (WWCE) dipole over midlatitude North America and a cold-north/warm-south (CNWS) dipole over eastern North America. It is found that while the North Pacific blocking (PB) is important for the WWCE and CNWS dipoles, they also depend on the phase of the North Atlantic Oscillation (NAO). When a negative-phase NAO (NAO-) concurs with PB, the WWCE dipole is enhanced (compared with the PB alone case) and it also leads to a warm north/cold south dipole anomaly in eastern North America; but when PB occurs with a positive-phase NAO (NAO<sup>+</sup>), the WWCE dipole weakens and the CNWS dipole is enhanced. In particular, the WWCE dipole is favored by a combination of eastward-displaced PB and NAO<sup>-</sup> that form a negative Arctic Oscillation. Furthermore, a WWCE dipole can form over midlatitude North America when PB occurs together with southward-displaced NAO<sup>+</sup>.The PB events concurring with NAO<sup>-</sup> (NAO<sup>+</sup>) and SAT WWCE (CNWS) dipole are favored by the El Nio-like (La Nia-like) SST mode, though related to the North Atlantic warm-cold-warm (cold-warm-cold) SST tripole pattern. It is also found that the North Pacific mode tends to enhance the WWCE SAT dipole through increasing PB-NAO<sup>-</sup> events and producing the WWCE SAT dipole component related to the PB-NAO<sup>+</sup> events because the PB and NAO<sup>+</sup> form a more zonal wave train in this case.</p>

Key Role of the North Pacific Oscillation–West Pacific Pattern in Generating the Extreme 2013/14 North American Winter

2015 ◽  
Vol 28 (20) ◽  
pp. 8109-8117 ◽  
Author(s):  
Stephen Baxter ◽  
Sumant Nigam
Keyword(s):  
North America ◽  
North American ◽  
North Pacific ◽  
Eastern North America ◽  
North Pacific Oscillation ◽  
Winter Climate ◽  
West Pacific ◽  
The North ◽  
The Tropics ◽  
The North Pacific

Abstract The 2013/14 boreal winter (December 2013–February 2014) brought extended periods of anomalously cold weather to central and eastern North America. The authors show that a leading pattern of extratropical variability, whose sea level pressure footprint is the North Pacific Oscillation (NPO) and circulation footprint the West Pacific (WP) teleconnection—together, the NPO–WP—exhibited extreme and persistent amplitude in this winter. Reconstruction of the 850-hPa temperature, 200-hPa geopotential height, and precipitation reveals that the NPO–WP was the leading contributor to the winter climate anomaly over large swaths of North America. This analysis, furthermore, indicates that NPO–WP variability explains the most variance of monthly winter temperature over central-eastern North America since, at least, 1979. Analysis of the NPO–WP related thermal advection provides physical insight on the generation of the cold temperature anomalies over North America. Although NPO–WP’s origin and development remain to be elucidated, its concurrent links to tropical SSTs are tenuous. These findings suggest that notable winter climate anomalies in the Pacific–North American sector need not originate, directly, from the tropics. More broadly, the attribution of the severe 2013/14 winter to the flexing of an extratropical variability pattern is cautionary given the propensity to implicate the tropics, following several decades of focus on El Niño–Southern Oscillation and its regional and far-field impacts.

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.

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.

scholarly journals Diversity of Hypoviruses and Other Double-Stranded RNAs in Cryphonectria parasitica in North America

1997 ◽  
Vol 87 (10) ◽  
pp. 1026-1033 ◽  
Author(s):  
Tobin L. Peever ◽  
Yir-Chung Liu ◽  
Michael G. Milgroom
Keyword(s):  
New York ◽  
Biological Control ◽  
New Jersey ◽  
North America ◽  
Detection System ◽  
Cryphonectria Parasitica ◽  
Eastern North America ◽  
Mixed Infections ◽  
The North ◽  
Hybridization Group

Double-stranded (ds) RNAs in Cryphonectria parasitica were randomly sampled from nine subpopulations in North America using an antibody-based detection system for dsRNA. dsRNA was detected in 166 (28%) of a total of 595 C. parasitica isolates sampled by immunoblotting. Incidence of dsRNA infection within subpopulations ranged from 0% in samples from New Hampshire and Ontario to 100% in County Line, MI. Most of the dsRNAs sampled were approximately 9 to 13 kb in size. dsRNAs from 72 isolates analyzed by probing Northern blots with 32P-labeled dsRNAs were in one of three hybridization groups. One hybridization group was widespread throughout eastern North America, being found in New York, New Jersey, Maryland, West Virginia, Kentucky, and Michigan. These dsRNAs hybridized to dsRNA from the previously described C. parasitica isolate SR2 from Maryland and are referred to as SR2-type dsRNAs. The second hybridization group was found almost exclusively in Michigan. The Michigan dsRNAs cross-hybridized to Cryphonectria hypovirus 3-GH2 (CHV3-GH2) and are referred to as CHV3-type dsRNAs.One dsRNA sampled from Kentucky hybridized to CHV3-type dsRNAs from Michigan. This dsRNA was probably derived from a fungal isolate that had been intentionally released for biological control at this same site 10 years previously and had become established in Kentucky. The third hybridization group was found only in New Jersey. These dsRNAs were much smaller than all other dsRNAs (3 and 5 kb) and were found in all 11 isolates that were probed; two of these isolates also had SR2-type dsRNA in mixed infections. None of the North American dsRNAs hybridized to CHV1 from Europe, even though CHV1 has been released in numerous locations in eastern North America for biological control of chestnut blight. Similarly, no dsRNAs hybridized to CHV2-NB58, a hypovirus found previously in New Jersey. Mixed infections of SR2-type and CHV3-type dsRNAs were found in 13 of 15 isolates from Frankfort, MI, while another nearby subpopulation (County Line) was infected with only CHV3-type dsRNAs. The distribution of dsRNA hybridization groups in C. parasitica thus presents a mixed picture, since one hybridization group is widespread, whereas two others are primarily restricted to smaller geographic areas.

scholarly journals A database of Holocene temperature records for north‐eastern North America and the north‐western Atlantic

2020 ◽  
Vol 7 (1) ◽  
pp. 38-43
Author(s):  
Simon van Bellen ◽  
Anne de Vernal ◽  
Anna To ◽  
Marie‐Michèle Ouellet‐Bernier ◽  
Natasha Roy ◽  
...  
Keyword(s):  
North America ◽  
Eastern North America ◽  
Western Atlantic ◽  
The North ◽  
North Eastern ◽  
Temperature Records ◽  
North Western

scholarly journals The Grinnell and Terra Nivea Ice Caps, Baffin Island

1956 ◽  
Vol 2 (19) ◽  
pp. 653-656 ◽  
Author(s):  
J. H. Mercer
Keyword(s):  
North America ◽  
Equilibrium Line ◽  
Eastern North America ◽  
General Tendency ◽  
Baffin Island ◽  
Ice Caps ◽  
Ice Cap ◽  
The North

AbstractThe Grinnell and Terra Nivea Ice Caps are the southernmost in eastern North America. The Grinnell Ice Cap reaches an altitude of 870 m. (2854 ft.). The general tendency is for slight retreat, but one large glacier is advancing. The equilibrium line is considerably lower than on the Penny Ice Cap to the north. Both firn and superimposed ice are important in the economy.

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