The Rediscovery of an Unusual North American Phryganeid, with some Additional Records of Caddisflies from Newfoundland (Trichoptera)

1961 ◽  
Vol 93 (8) ◽  
pp. 695-702 ◽  
Author(s):  
Glenn B. Wiggins
Keyword(s):  
North America ◽  
Early Paper ◽  
North American ◽  
Northeastern North America ◽  
East And West

Most of the published references to Newfoundland caddisflies are derived from one early paper by Nathan Ranks in 1908. Several collections received recently, however, have considerably extended knowledge of the Newfoundland caddisfly fauna. As might be expected, many of the species occurring in Newfoundland also extend across the whole of northern North America, and to some extent southward along the montane areas in both east and west. Some of these also occur throughout the holarctic area. Some of the species are, however, confined to northeastern North America. There are no species of caddisflies now known which are confined to the island of Newfoundland.

Skeleton of Extinct North American Sea Mink (Mustela macrodon)

2000 ◽  
Vol 53 (2) ◽  
pp. 247-262 ◽  
Author(s):  
Jim I. Mead ◽  
Arthur E. Spiess ◽  
Kristin D. Sobolik
Keyword(s):  
Native American ◽  
North America ◽  
North American ◽  
Gulf Of Maine ◽  
American Mink ◽  
Shell Middens ◽  
Northeastern North America ◽  
The North ◽  
Coastal Island ◽  
Alexander Archipelago

AbstractMustela macrodon (extinct sea mink) is known only from prehistoric and historic Native American shell middens dating less than 5100 years old along coastal islands of the Gulf of Maine, northeastern North America. The species is distinct from all known extant subspecies of M. vison (American mink) but still belongs to the North American subgenus Vison. Metric comparisons between M. macrodon and five subspecies of M. vison, using skull, mandible, humerus, radius, femur, and tibia skeletal elements, show that M. macrodon is larger in overall size and robustness and is proportionately larger in the dental region. Many habitat-related parallels exist between coastal island mink of the Gulf of Maine and those of the Alexander Archipelago, southeastern Alaska, where the overall largest living subspecies of mink is found (M. v. nesolestes).

scholarly journals Phegopteris excelsior (Thelypteridaceae): A New Species of North American Tetraploid Beech Fern

2019 ◽  
Vol 27 (4) ◽  
pp. 211-218 ◽  
Author(s):  
Nikisha R. Patel ◽  
Susan Fawcett ◽  
Arthur V. Gilman
Keyword(s):  
New Species ◽  
North America ◽  
Principal Components Analysis ◽  
Principal Components ◽  
North American ◽  
Northeastern North America ◽  
Specific Rank ◽  
Components Analysis ◽  
Morphological Differences ◽  
A New Species

Since the 1970s, an apomictic tetraploid beech fern (genus Phegopteris (C. Presl) Fée) has been known in northeastern North America. Previously published isozyme data suggest that this lineage is of allopolyploid origin involving long beech fern (P. connectilis (Michx.) Watt.) but not broad beech fern (P. hexagonoptera (Michx.) Fée), as originally hypothesized. Its second progenitor remains unknown. We performed a principal components analysis of the apomict and its North American congeners to elucidate morphological differences between them. We recognize the apomictic tetraploid at specific rank as P. excelsior N. R. Patel & A. V. Gilman and provide an illustration, a range map, a list of exsiccatae, and a key to Phegopteris species of North America.

Taxonomic status of diploid Salicornia europaea (s.l.) (Chenopodiaceae) in northeastern North America

1987 ◽  
Vol 65 (7) ◽  
pp. 1420-1426 ◽  
Author(s):  
S. L. Wolff ◽  
R. L. Jefferies
Keyword(s):  
North America ◽  
North American ◽  
Taxonomic Status ◽  
Distinct Group ◽  
Salicornia Europaea ◽  
Electrophoretic Variation ◽  
Northeastern North America ◽  
Anther Length ◽  
Length Width ◽  
Diploid Populations

The taxonomic status of diploid Salicornia europaea L. (s.l.) in northeastern North America has been evaluated based on morphological and electrophoretic variation within and between populations. Populations of two European diploid micro-species, S. ramosissima J. Woods and S. europaea (s.s.), and populations of the midwestern diploid, S. rubra A. Nels., were also examined, affording a comparison between North American S. europaea (s.l.) and recognized species. Anther length, width of the scarious border of the fertile segment, and floral perianth shape were used to subdivide North American diploid populations into two groups. These groups were morphologically distinct from S. rubra and the European microspecies. The electrophoretic profile was unique in each morphologically distinct group of populations of S. europaea (s.l.) in northeastern North America. Based on morphological, geographical, and electrophoretic differences, diploid populations of S. europaea (s.l.) from this region are assigned to one of the following two new species: S. maritima Wolff & Jefferies, sp.nov., and S. borealis Wolff & Jefferies, sp.nov. The tetraploids are retained in S. europaea (s.l.).

A study of northeastern North American spectral moments, magnitudes, and intensities

1977 ◽  
Vol 67 (3) ◽  
pp. 599-614 ◽  
Author(s):  
R. L. Street ◽  
F. T. Turcotte
Keyword(s):  
North America ◽  
North American ◽  
Stress Drop ◽  
Regression Coefficients ◽  
Spectral Moment ◽  
Spectral Moments ◽  
Northeastern North America ◽  
The Relationship

abstract Thirty-two earthquakes in northeastern North America ranging in seismic moments of 1.5E19 to 6.0E26 (dyne-cm) are used to develop relationships between spectral moment, magnitudes (mbLg and MS), and intensity. It is shown that northeastern North American events are readily characterized by a well-behaved, steadily increasing stress drop relative to increasing magnitude. As a result, the relationship between the regional mbLg and MS as implied by the spectral results is m b L g = M s + 1.2 ( 1.8 ≦ m b L g ≦ 4.4 ) and m b L g = 0 . 6 1 M s + 2.33 ( 4.4 ≦ m b L g ≦ 6.8 ) . Published relationships between the mbLg magnitude, the log10 of the area within the intensity IV isoseismal contour, and the falloff of the intensity technique described by Nuttli (1973b) are checked for suitability. The results are as follows m b L g = 1.13 log 10 ( A I V ) − 0.32 A I V ≧ 10 , 000 k m 2 and m b L g = 0.97 m b ( b a s e d o n f a l l o f f ) + 0.22 , with regression coefficients of 0.94 and 0.99 respectively.

Speciation and hybridisation in North American quillworts

1985 ◽  
Vol 86 ◽  
pp. 259-263 ◽  
Author(s):  
W. Carl Taylor ◽  
Neil T. Luebke ◽  
Mary B. Smith
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
Chromosome Numbers ◽  
Distribution Patterns ◽  
Spore Formation ◽  
Enzyme Electrophoresis ◽  
Northeastern North America ◽  
Natural Hybrids ◽  
Natural Hybridisation

SynopsisSpecies of Isoetes in northeastern North America may have evolved through hybridisation and allopolyploidy. Evidence for natural hybridisation was obtained from overlapping distribution patterns, abortive and polymorphic spore formation, chromosome numbers ranging from diploid to decaploid, and additive enzyme electrophoresis profiles. The ease with which hybrids form in culture supports the hypothesis that natural hybrids occur and that hybridisation could be involved in the evolution of new species.

Scaling northeastern United States/southeastern Canadian earthquakes by their Lg waves

1976 ◽  
Vol 66 (5) ◽  
pp. 1525-1537 ◽  
Author(s):  
Ronald L. Street
Keyword(s):  
United States ◽  
Spectral Analysis ◽  
North America ◽  
North American ◽  
Magnitude Scale ◽  
Northeastern United States ◽  
Northeastern North America ◽  
Central United States ◽  
Lg Wave ◽  
Spatial Attenuation

abstract Displacement spectral densities and spatial attenuation of Lg waves from four earthquakes were studied in detail to determine the applicability of Nuttli's (1973) Lg-magnitude formulas to northeastern North American earthquakes. It was found that the 1-sec-period Lg wave from these events was attenuated at a slightly greater rate than has been observed in the central United States. However, comparison of the A/T observations and the Lg spectral analysis results of the two regions demonstrated that it was permissible to use Nuttli's Lg-magnitude formulas for scaling northeastern earthquakes if the amplitude observations are restricted to within 20° of the earthquake's epicenter. This result establishes the basis for a unified mb magnitude scale between central and northeastern North America.

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