scholarly journals "Birds of Eastern North America: A Photographic Guide" and "Birds of Western North America: A Photographic Guide" by Paul Sterry and Brian E. Small. 2009. [book review]

2009 ◽  
Vol 123 (3) ◽  
pp. 269
Author(s):  
Mark Gawn
Keyword(s):  
North America ◽  
Eastern North America ◽  
Western North America

High-Frequency Seismic Wave Propagation in Northeastern North America

1990 ◽  
Vol 61 (3-4) ◽  
pp. 193-208 ◽  
Author(s):  
S. E. Hough ◽  
K. H. Jacob ◽  
L. Seeber
Keyword(s):  
North America ◽  
High Frequency ◽  
Characteristic Length ◽  
Body Waves ◽  
Eastern North America ◽  
Western North America ◽  
Energy Propagation ◽  
Length Scales ◽  
Near Surface ◽  
High Frequencies

Abstract A key element in the assessment of seismic hazard is the estimation of how energy propagation from a given earthquake is affected by crustal structure near the receiver and along the more distant propagation path. In this paper, we present data from a variety of sources in eastern North America recorded at epicentral distances of a few to 800 km, and characterize and interpret systematic features. Site effects have been classically considered in terms of amplification either within a sediment-filled valley or from a single topographic feature (Geli et al., 1988). We present evidence of high frequency (5–30 Hz) resonances observed in hard-rock recordings of both body waves and Lg waves, and suggest that site effect should be expanded regionally to include structural and topographic information over sufficiently large areas to include several wavelengths of any features that may interact with seismic waves in the frequency range of interest. A growing body of evidence suggests that ground motions at high frequencies recorded at large epicentral distances in eastern North America are controlled by resonance effects. We hypothesize that a fundamental difference between eastern and western North America spectra stems from a combination of differences in the character of topography and near-surface structure. Active tectonics of western North America gives rise to a complex crust that scatters seismic energy in a random manner and results in very effective attenuation of high frequencies. The older eastern North American crust contains scatterers that are more ordered, with characteristic length scales that give rise to resonance phenomena in the frequency band critical for earthquake hazard. We present preliminary analysis of topographic data from the Adirondack Mountains in New York that demonstrates the existence of characteristic length scales on the order of up to 1–3 kilometers. Features with these length scales will effectively scatter energy at frequencies in the 1 to 10 Hz range.

REVISION OF SOME DIMERIELLA AND DIMEROSPORIUM PARASITES OF CONIFERS

1965 ◽  
Vol 43 (6) ◽  
pp. 631-639 ◽  
Author(s):  
R. A. Shoemaker
Keyword(s):  
North America ◽  
Abies Alba ◽  
Tsuga Canadensis ◽  
Tsuga Heterophylla ◽  
Eastern North America ◽  
Western North America ◽  
Abies Grandis ◽  
Abies Amabilis ◽  
Conifer Needles ◽  
Tsuga Mertensiana

Study of the type of Dimerosporium balsamicola (Peck) Ell. & Ev. (≡ Meliola balsamicola Peck) revealed that this species is a melioline hyperparasite. The fungus is transferred to Dimerium, redescribed, illustrated, and distinguished from Phacocryptopus nudus (Peck) Petrak, Asterina sp., and from Epipolaeum abietis (Dearness) n. comb. (≡ Dimerosporium abietis Dearness), which also occur on Abies in North America. In all, four species of Epipolaeum that occur on conifer needles are treated: Epipolaeum abietis on Abies grandis (Dougl.) Lindl. and Abies amabilis (Dougl.) Forb. in western North America, on Abies alba Mill. in France, and on Keteleeria davidiana Beiss. in Formosa; Epipolaeum tsugae (Dearness) n. comb. on Tsuga canadensis (L.) Carr. in eastern North America, and on Tsuga heterophylla (Raf.) Sarg. and Tsuga mertensiana (Bong.) Carr. in western North America; Epipolaeum pseudotsugae (V. M. Miller & Bonar) n. comb. on Pseudotsuga taxifolia (Poir.) Britton from western North America; Epipolaeum terrieri (Petrak in Terrier) n. comb. on Abies alba in Switzerland.

The Galium trifidum group (Galium sect. Aparinoides, Rubiaceae)

1976 ◽  
Vol 54 (16) ◽  
pp. 1911-1925 ◽  
Author(s):  
C. Puff
Keyword(s):  
North America ◽  
Eastern North America ◽  
Great Lakes Region ◽  
Western North America ◽  
Eastern Asia ◽  
Chromosome Counts ◽  
New Classification ◽  
North Eastern ◽  
North Western

By using morphology, karyology, pollen size, leaf flavonoids, ecological observations, and modification experiments, a new classification of the Galium trifidum group is proposed. Nine taxa in five species are recognized: (1) G. tinctorium, with ssp. tinctorium and sap. floridanum (new comb.) in eastern North America; (2) G. brevipes, a rare species centered in the Great Lakes region; (3) G. trifidum, with ssp. trifidum in northern North America. Asia, and Europe, ssp. columbianum (new comb.) in (north)western North America and (north)eastern Asia, and ssp. subbiflorum (new comb.) and ssp. halophilum (new comb.) in northern North America; (4) G. innocuum in southeastern Asia; (5) G. karakulense in central Asia.New chromosome counts of n = 12 and 2n = 24 are reported for G. tinctorium ssp. tinctorium and ssp. floridanum; and G. trifidum ssp. trifidum, ssp. columbianum, and ssp. subbiflorum.

A late snow bed bryophyte community in western Newfoundland, Canada

1983 ◽  
Vol 61 (1) ◽  
pp. 218-223 ◽  
Author(s):  
René J. Belland
Keyword(s):  
North America ◽  
Distribution Pattern ◽  
Disjunct Distribution ◽  
Eastern North America ◽  
Western North America ◽  
Undescribed Species ◽  
Additional Species

The bryophyte floras of eight bryophyte-dominated late snow beds near Bonne Bay, western Newfoundland, were investigated and consisted of 49 species of which 4 are reported new for eastern North America (excluding Greenland): Andreaea nivalis Hook., Kiaeria falcata (Hedw.) Hag., Moerckia blyttii (Moerck) Brockm., and an undescribed species of Trematodon. Five additional species were previously unreported from Newfoundland. Eleven bryophytes from the Newfoundland snow beds are characteristic of this habitat throughout much of their world range, and 13 species show a disjunct distribution pattern between eastern and western North America.

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