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.).

Morphological and isozyme variation in Salicornia europaea (s.l.) (Chenopodiaceae) in northeastern North America

1987 ◽  
Vol 65 (7) ◽  
pp. 1410-1419 ◽  
Author(s):  
S. L. Wolff ◽  
R. L. Jefferies
Keyword(s):  
North America ◽  
Atlantic Coast ◽  
Hudson Bay ◽  
Salicornia Europaea ◽  
Electrophoretic Variation ◽  
James Bay ◽  
Northeastern North America ◽  
Electrophoretic Patterns ◽  
Anther Length ◽  
Vegetative Characters

Morphological and electrophoretic variation has been documented within and among populations of Salicornia europaea L. (s.l.) in northeastern North America. Univariate and multivariate analyses (discriminant analyses) of measurements of floral and vegetative characters delimited three morphologically distinct groups of populations: Atlantic coast tetraploids (2n = 36), Hudson Bay diploids, and Atlantic coast and James Bay diploids (2n = 18). The two diploid groups were morphologically distinct from the midwestern diploid, S. rubra Nels., based on anther length, width of the scarious border of the fertile segment, and the overall width of the fertile segment. Electrophoretic evidence supported the delimitation of the three distinct morphological groups of populations of S. europaea with the exception of the population from James Bay, which had electrophoretic patterns identical with those of plants from Hudson Bay but resembled the Atlantic coast diploids morphologically. Most enzyme systems assayed were monomorphic. Only homozygous banding patterns were detected in diploid plants and electrophoretic variation was not observed within populations of S. europaea or S. rubra but was detected between groups of populations. Four multilocus phenotypes were evident; these corresponded to the major groups recognized on the basis of ploidy level and morphology. Reasons that may account for the paucity of isozymic variation are discussed.

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.

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.

Melaspilea demissa(Tuck.) Zahlbr. (lichenized Ascomycota) in eastern North America with a key to North American species ofMelaspileas. lat.

2015 ◽  
Vol 47 (3) ◽  
pp. 167-182 ◽  
Author(s):  
Gary B. Perlmutter ◽  
Shirley C. Tucker ◽  
Eimy Rivas Plata ◽  
Philippe Clerc ◽  
Robert Lücking
Keyword(s):  
North America ◽  
North American ◽  
Taxonomic Status ◽  
North American Species ◽  
Eastern North America ◽  
Type Collection ◽  
South Eastern ◽  
The North ◽  
Eastern Usa ◽  
Original Treatment

AbstractRecently collected specimens of the crustose lichenMelaspilea demissafrom south-eastern USA have been compared with those ofMelaspileaspp. previously determined from North America. A review of both the historical and contemporary treatments of this species is provided. A lectotype was selected from the type collection ofM. demissain FH and is here proposed as it best matches incomplete citations in the original treatment. We also discuss the nomenclatural and taxonomic status of the nameOpegrapha cymbiformisvar.deformis(considered a synonym ofM. gibberulosa). North American specimens ofM. gibberulosawere found to be misidentifications, as were specimens attributed toM. lentiginosula,M. mesophlebiaandM. octomera. We therefore recommend that these species be removed from the North American lichen checklist. We also present a key to North AmericanMelaspilea.

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.

The graptolite Amplexograptus praetypicalis n. sp. and the origin of the typicalis group

1987 ◽  
Vol 24 (5) ◽  
pp. 924-933 ◽  
Author(s):  
John Riva
Keyword(s):  
North America ◽  
Related Species ◽  
Type Species ◽  
Distinct Group ◽  
Late Ordovician ◽  
Lower Half ◽  
Northeastern North America ◽  
Distinct Process ◽  
Distinct Lineage ◽  
Early Late

The graptolite Amplexograptus praetypicalis n. sp. is described and assigned to a more precisely defined and amended genus Amplexograptus Elles and Wood. This graptolite ranges through the lower half of the Climacograptus spiniferus Zone of northeastern North America and evolves, through a distinct process of phyletic gradualism, into the better known Climacograptus typicalis Hall. Climacograptus typicalis ranges through the upper half of the C. spiniferus Zone and the succeeding Climacograptus pygmaeus Zone, giving rise to three related species: the dwarfish Climacograptus pygmaeus Ruedemann, the gigantic Climacograptus magnificus Twenhofel, and the atavistic Climacograptus posterus Ruedemann. Together, these four species form a distinct group, termed the typicalis group, and a distinct lineage that had a brief existence from the late Middle to the early Late Ordovician. The genus Uticagraptus n. g. is here proposed for the graptolites of the typicalis group. This group is characterized by an advanced prosoblastic type of proximal-end development and an aseptate rhabdosome and, thus, differs fundamentally from Climacograptus bicornis (Hall), the type species of Climacograptus, with a more primitive diplograptid type of proximal-end development and a septate rhabdosome.

The taxonomic status of Vaccinium boreale

1977 ◽  
Vol 55 (3) ◽  
pp. 281-288 ◽  
Author(s):  
S. P. Vander Kloet
Keyword(s):  
North America ◽  
Taxonomic Status ◽  
Leaf Margin ◽  
Northeastern North America ◽  
Natural Hybrids ◽  
Taxonomic Studies

Two hundred and fourteen specimens of Vaccinium subgen. Cyanococcns were collected from 40 sites in northeastern North America for taxonomic studies. Data collected using various techniques indicate that V. boreale Hall & Aalders should be recognized as a species. Three characters, viz. dimension, pubescence, and leaf margin, separate V. boreale from V. angustifolium and V. myrtilloides. Although the three species are sympatric, only a few natural hybrids between V. boreale and V. myrtilloides have been found among the collected material. Crossing trials between V. boreale and V. pallidum suggest that the two are probable ancestors of V. angustifolium.

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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