A TAXONOMIC STUDY OF WESTERN CANADIAN SPECIES IN THE GENUS BETULA

1966 ◽  
Vol 44 (7) ◽  
pp. 929-1007 ◽  
Author(s):  
Janet R. Dugle
Keyword(s):  
Gene Flow ◽  
Chromosome Number ◽  
North American ◽  
Parental Species ◽  
Environmental Influence ◽  
Taxonomic Study ◽  
Environmental Selection ◽  
First Time ◽  
Lower Chromosome Number

Five western North American birches, Betula fontinalis, B. glandulosa, B. glandulifera, B. resinifera, and B. papyrifera, are studied taxonomically. Four hybrids, B. × winteri, B. × sargentii, B. × arbuscula, and B. × uliginosa, are described for the first time and three others, B. × utahensis, B. × eastwoodae, and B. × sandbergii, are also included. Populations formed when species are in contact have been analyzed and the nature of several hybrid entities determined. B. × uliginosa results from B. resinifera × B. glandulifera. In this population, introgression is toward B. glandulifera, which has the higher chromosome number. B. glandulifera also hybridizes with B. glandulosa producing B. × sargentii. Most gene flow is toward B. glandulifera, which has the higher chromosome number. In B. glandulosa × B. fontinalis (B. × eastwoodae) introgression was little influenced by environmental selection, the hybrid was as common as either parental species, and any gene flow was in either direction. B. × utahensis results from B. papyrifera × B. fontinalis. Introgression is toward B. papyrifera. Hybridization of B. × sargentii and B. papyrifera produces B. × arbuscula, a rare hybrid. Hybridization of B. resinifera and B. papyrifera results in B. × winteri, with introgression in both directions. B. × sandbergii results from B. papyrifera × B. glandulifera. Probably as a result of environmental influence in the analysis area, introgression was toward B. glandulifera, with the lower chromosome number.

scholarly journals A taxonomic study on Centaurea sect. Rhizocalathium and C. sect. Pseudoseridia (Asteraceae, Cardueae–Centaureinae) in Iran

Phytotaxa ◽  
2014 ◽  
Vol 174 (1) ◽  
pp. 43 ◽  
Author(s):  
Kazem Negaresh ◽  
MOHAMMAD REZA RAHIMINEJAD ◽  
MASSOUD RANJBAR
Keyword(s):  
Chromosome Number ◽  
Basic Chromosome Number ◽  
New Combination ◽  
Taxonomic Study ◽  
Basic Chromosome ◽  
New Subspecies ◽  
Taxonomic Review ◽  
First Time

A taxonomic review of Centaurea sect. Rhizocalathium Tzvelev and C. sect. Pseudoseridia Wagenitz in Iran was carried out. The latter, with only one species, Centaurea stevenii, is reported here as new to Iran. In Centaurea sect. Rhizocalathium, C. lasiorhiza is treated as a correct name, C. ispahanica subsp. sirjanensis is described as a new subspecies and C. ispahanica subsp. macrocarpa is proposed as a new combination. Finally, C. ispahanica is typified and its chromosome number is reported for the first time, and a new basic chromosome number for C. sect. Rhizocalathium is proposed.

The bearing of Phoxinus (Cyprinidae) hybridity on the classification of its North American species

1970 ◽  
Vol 48 (6) ◽  
pp. 1167-1177 ◽  
Author(s):  
Pierre Legendre
Keyword(s):  
Chromosome Number ◽  
Discriminant Function ◽  
North American ◽  
Parental Species ◽  
North American Species ◽  
Discriminant Functions

Three populations of Phoxinus eos × P. neogaeus were found to form single Mendelian populations, by comparison with the parental species through a discriminant function. The hybrids of one of these populations were found to be fertile. A fourth hybrid collection, studied by three discriminant functions, was found to contain Semotilus margarita, P. eos × P. neogaeus, and hybrids of S. margarita with at least P. eos, but possibly P. eos × P. neogaeus. The presence of this hybrid, when related to the chromosome number of the species concerned, suggests the transfer of S. margarita to the genus Phoxinus.

Cytogeographic studies on North American asters. II. Virgulus ericoides and V. novae-angliae in southern Ontario

1985 ◽  
Vol 63 (9) ◽  
pp. 1652-1653
Author(s):  
Jerry G. Chmielewski ◽  
John C. Semple
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Southern Ontario ◽  
First Time

Chromosome number determinations for 95 populations of Virgulus ericoides and 135 populations of V. novae-angliae from southern Ontario are reported for the first time. Although much of southern Ontario was sampled for these species, sampling was concentrated in the area formerly occupied by Ontario Island. All populations for both taxa were diploid (2n = 10), unlike the situation in several other asters that have been studied previously.

Chromosome numbers and the taxonomy of North American Agalinis (Scrophulariaceae)

1984 ◽  
Vol 62 (3) ◽  
pp. 454-456 ◽  
Author(s):  
Judith M. Canne
Keyword(s):  
Chromosome Number ◽  
North American ◽  
Chromosome Numbers ◽  
Base Number ◽  
Chromosome Counts ◽  
Base Chromosome Number ◽  
First Time

Chromosome counts are provided for 25 populations representing 18 species of Agalinis Raf. Chromosome numbers are reported for the first time for A. pinetorum, A. laxa, A. acuta, A. gattingeri, and A. skinneriana. The base chromosome number for section Linifoliae, section Heterophyllae, section Purpureae subsections Purpureae and Setaceae, and section Tenuifoliae is established at x = 14. Section Erectae and section Purpureae subsection Pedunculares have a base number of x = 13.

More Christian Apocrypha

2012 ◽  
Vol 41 (3) ◽  
pp. 16-21
Author(s):  
Tony Burke
Keyword(s):  
New Testament ◽  
Old Testament ◽  
North American ◽  
English Language ◽  
Primary Sources ◽  
University Of Edinburgh ◽  
The University ◽  
First Time ◽  
Medieval Christianity

Scholars interested in the Christian Apocrypha (CA) typically appeal to CA collections when in need of primary sources. But many of these collections limit themselves to material believed to have been written within the first to fourth centuries CE. As a result a large amount of non-canonical Christian texts important for the study of ancient and medieval Christianity have been neglected. The More Christian Apocrypha Project will address this neglect by providing a collection of new editions (some for the first time) of these texts for English readers. The project is inspired by the More Old Testament Pseudepigrapha Project headed by Richard Bauckham and Jim Davila from the University of Edinburgh. Like the MOTP, the MCAP is envisioned as a supplement to an earlier collection of texts—in this case J. K. Elliott’s The Apocryphal New Testament (Oxford 1991), the most recent English-language CA collection (but now almost two decades old). The texts to be included are either absent in Elliott or require significant revision. Many of the texts have scarcely been examined in over a century and are in dire need of new examination. One of the goals of the project is to spotlight the abilities and achievements of English (i.e., British and North American) scholars of the CA, so that English readers have access to material that has achieved some exposure in French, German, and Italian collections.

CHROMOSOME NUMBER DETERMINATIONS IN FAMILY COMPOSITAE, TRIBE ASTEREAE. IX. NORTH AMERICAN TAXA. II

Rhodora ◽  
10.3119/18-07 ◽  
2019 ◽  
Vol 121 (985) ◽  
pp. 37 ◽  
Author(s):  
John C. Semple ◽  
Rachel E. Cook ◽  
Gary H. Morton ◽  
James B. Beck ◽  
Rita Lopez Laphitz
Keyword(s):  
Chromosome Number ◽  
North American

FURTHER STUDIES ON NATURAL SELECTION AMONG HYBRIDS OF CARDUUS ACANTHOIDES AND CARDUUS NUTANS

1964 ◽  
Vol 42 (12) ◽  
pp. 1605-1613 ◽  
Author(s):  
R. J. Moore ◽  
G. A. Mulligan
Keyword(s):  
Natural Selection ◽  
Chromosome Number ◽  
Parental Species ◽  
Experimental Studies ◽  
Great Decrease ◽  
Carduus Acanthoides ◽  
Carduus Nutans ◽  
Experimental Plots ◽  
Better Than ◽  
Made In

A third 5-year survey made in 1962 of Carduus acanthoides, C. nutans, and their hybrids in Grey Co., Ontario, revealed that a great decrease in these populations had occurred. C. acanthoides and hybrids similar to this species had survived better than C. nutans but very little spread of either species seemed to have occurred in 1957–1962. In experimental plots the hybrid has been made and backcrossed to the parental species. The species differ in chromosome number (C. acanthoides, 2n = 22; C. nutans, 2n = 16) and hybrids have intermediate numbers. Evidence was found from field and experimental studies that the progeny of the F1 hybrid included a greater proportion of seedlings with the higher chromosome numbers than with the lower and intermediate numbers. It is suggested that this selection may operate through the rejection of the longer chromosomes received from C. nutans, which, in certain zygotic combinations may constitute an excess of chromatin lethal to the zygote.

NORTH AMERICAN WATER MITES OF THE FAMILY MOMONIIDAE VIETS (ACARI: ARRENUROIDEA). IV. REVISION OF SPECIES OF STYGOMOMONIA (SENSU STRICTO) SZALAY, 1943

1991 ◽  
Vol 123 (3) ◽  
pp. 501-558 ◽  
Author(s):  
Ian M. Smith
Keyword(s):  
New Species ◽  
North American ◽  
Sensu Stricto ◽  
North American Species ◽  
Water Mites ◽  
Dispersal Patterns ◽  
The Family ◽  
Three New Species ◽  
New Diagnosis ◽  
First Time

AbstractMorphological, life history, and distributional data are presented for North American species of the subgenus Stygomomonia (sensu stricto) Szalay, 1943. Adults of the seven previously recognized species are redescribed, and deutonymphs of five of these species are described for the first time. Two species, S. (s.s.) neomexicana Cook and S. (s.s.) occidentalis Cook are substantially revised on the basis of an examination of the types and extensive series of newly collected specimens. Three new species are described, S. (s.s.) californiensis on the basis of deutonymphs and adults, and S. (s.s.) imamurai and S. (s.s.) cooki on the basis of adults. A new diagnosis of the subgenus is proposed and discussed, the relationships of the various species are discussed, and a key to deutonymphs and adults of North American species is presented. New distributional data are presented for all species, and dispersal patterns from Pleistocene refugia are discussed.

scholarly journals Isodontia Mexicana (Hymenoptera, Sphecidae), a New Invasive Wasp Species in the Fauna of Ukraine Reared from Trap-Nests in the Crimea

2014 ◽  
Vol 48 (2) ◽  
pp. 185-188 ◽  
Author(s):  
A. V. Fateryga ◽  
Yu. V. Protsenko ◽  
V. Yu. Zhidkov
Keyword(s):  
Invasive Species ◽  
North American ◽  
Southern Coast ◽  
Wasp Species ◽  
Positive Identification ◽  
Trap Nests ◽  
The Crimea ◽  
Adult Wasp ◽  
First Time

Abstract Isodontia mexicana (Hymenoptera, Sphecidae), a New Invasive Wasp Species in the Fauna of Ukraine Reared from Trap-Nests in the Crimea. Fateryga, A. V., Protsenko, Yu. V., Zhidkov, V. Yu. - Th e North American wasp Isodontia mexicana was found for the first time in Ukraine in trap-nests operated near Pushkino (southern coast of the Crimea) in 2012. Th ree nests contained five cocoons, from which only one adult wasp emerged in 2013, allowing the positive identification; other cocoons were either empty (one) or destroyed by Melittobia acasta (three). Such a find of a newly established invasive species in Ukraine represents the easternmost point in its European range and possibly the most remarkable jump-dispersal event in its distribution.

scholarly journals Incomplete barriers to mitochondrial gene flow between pheromone races of the North American pine engraver, Ips pini (Say) (Coleoptera, Scolytidae)

1999 ◽  
Vol 266 (1431) ◽  
pp. 1843-1850 ◽  
Author(s):  
Anthony I. Cognate ◽  
Steven J. Seybold ◽  
Felix A. H. Sperling
Keyword(s):  
Gene Flow ◽  
North American ◽  
Mitochondrial Gene ◽  
Ips Pini ◽  
Pine Engraver ◽  
The North
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