Black-fruited hawthorns of western North America — one or more agamic complexes?This paper is one of a selection of papers published in the Special Issue on Systematics Research.This paper is dedicated to the memory of the University of Idaho botanist who got us thinking about the complexities of Northwest hawthorns: the late Steven J. Brunsfeld.

Botany ◽  
2008 ◽  
Vol 86 (8) ◽  
pp. 846-865 ◽  
Author(s):  
Timothy A. Dickinson ◽  
Eugenia Y.Y. Lo ◽  
Nadia Talent ◽  
Rhoda M. Love
Keyword(s):  
North America ◽  
Leaf Shape ◽  
Molecular Data ◽  
Ploidy Levels ◽  
Gametophytic Apomixis ◽  
Single Clade ◽  
Self Compatibility ◽  
Distribution And Ecology ◽  
Taxonomic Groups ◽  
The University

Black-fruited hawthorns in North America comprise two taxonomic groups within the genus Crataegus , section Brevispinae and section Douglasianae. The first of these has recently been shown to be monospecific, consisting of the blueberry haw, Crataegus brachyacantha Sarg. & Engelm., of Louisiana and Texas. Crataegus section Douglasianae, however, comprises several taxa in a single clade that is not closely related to section Brevispinae, and that is now one of the best-studied groups of hawthorns at least in North America. Most taxa in the group are found in, or west of, the Rocky Mountains. They include diploids, triploids, and tetraploids that can be ascribed to four or more species that differ in distribution and ecology, thorn morphology, leaf shape, and floral architecture. Diploids are self-incompatible, whereas polyploidy is associated with pseudogamous, gametophytic apomixis and self compatibility. Molecular data suggest that polyploids have arisen repeatedly, both within and from crosses between ploidy levels. We suggest that Crataegus section Douglasianae represents at least two agamic complexes that may serve as models for understanding the biology of, the relationships within, and the appropriate taxonomic treatment of other such groups that may make up much of the rest of the genus.

Arctic Science and Technology Information System

2021 ◽  
Vol 23 (2) ◽  
pp. 5-7
Author(s):  
Jane C. Duffy
Keyword(s):  
Information System ◽  
North America ◽  
Science And Technology ◽  
The Arctic ◽  
Free Text ◽  
Bibliographic Database ◽  
Research Projects ◽  
Search Terms ◽  
University Of Calgary ◽  
The University

ASTIS offers over 83,000 records that provide freely available access to publications, including research and research projects, about Canada's north. This database is a product of the Arctic Institute of North America at the University of Calgary, Alberta, Canada which also maintains subsidiary regional, subject, and initiative-based databases. The subsidiary databases are all housed within and accessible through the main ASTIS database. Examples of the smaller databases include: ArcticNet Publications Database, the Nunavik Bibliography, and the Northern Granular Resources Bibliographic Database. ASTIS offers the ability to browse through its access points, including its own thesauri, thus permitting users to select and use a variety of free-text and controlled search terms.

An Archaeological Survey of Caves in Washington

1954 ◽  
Vol 19 (4) ◽  
pp. 387-389
Author(s):  
Earl Swanson ◽  
Alan Bryan
Keyword(s):  
North America ◽  
Field Work ◽  
Archaeological Research ◽  
Archaeological Survey ◽  
Large Area ◽  
Columbia Plateau ◽  
Long Period ◽  
Western Washington ◽  
The University ◽  
Private Collections

During a long period of the time when archaeological research was in progress in other areas of North America, the Columbia Plateau and western Washington lay relatively untouched and unknown. Only recently have systematic studies been undertaken by the University of Washington.The archaeological survey of cave sites in Washington, during the summer of 1952, is a part of those studies. The plan was to locate as many caves as possible, to determine if they had been occupied aboriginally, and to evaluate them with an eye to future excavation.Prior to the field work, reports had been received of caves in various parts of Washington, but the total was small, and we had little expectation of swelling the known number. Many of these had been learned of through newspaper clippings and letters, and from amateur activities. The problem, then, was not simply to examine a few choice caves for testing and excavation, but of surveying a large area in order to initiate an immediate program of excavation to save what remained. In addition to the survey of the caves, the University provided money for the examination of private collections.

scholarly journals Two new species of Bimastos (Oligochaeta, Lumbricidae) from the Southern Appalachian Mountains, North America

Zootaxa ◽  
2021 ◽  
Vol 5052 (3) ◽  
pp. 395-405
Author(s):  
ROBERTO CARRERA-MARTÍNEZ ◽  
DANIEL JONES ◽  
SEAN D. SCHOVILLE ◽  
BRUCE A. SNYDER ◽  
MAC A. JR. CALLAHAM
Keyword(s):  
New Species ◽  
Body Size ◽  
North America ◽  
Appalachian Mountains ◽  
Molecular Data ◽  
Southern Appalachian Mountains ◽  
Southern Appalachian ◽  
Two New Species ◽  
Morphological And Molecular Data ◽  
Posterior Position

Two new species of Bimastos Moore are described based on morphological and molecular data. Bimastos nanae n. sp. resembles B. lawrenceae Fender, B. zeteki (Smith and Gittins) and B. welchi (Smith). Bimastos nanae n. sp. differs from these species in the position of the clitellum, size and number and position of thickened septa. Bimastos magnum n. sp. is similar to B. schwerti Csuzdi & Chang and B. palustris Moore in having a fully annular clitellum and male pores on huge porophores. Bimastos magnum n. sp. differs from both species by having a more posterior position of the clitellum (in xxiv-xxxiii, xxxiv) and larger body size. With the description of these new species, the number of Bimastos species is raised to 14.  

scholarly journals Diversity of echinostomes (Digenea: Echinostomatidae) in their snail hosts at high latitudes

Parasite ◽  
2021 ◽  
Vol 28 ◽  
pp. 59
Author(s):  
Camila Pantoja ◽  
Anna Faltýnková ◽  
Katie O’Dwyer ◽  
Damien Jouet ◽  
Karl Skírnisson ◽  
...  
Keyword(s):  
North America ◽  
Dna Sequences ◽  
Sequence Data ◽  
Molecular Data ◽  
Migratory Bird ◽  
Parasite Fauna ◽  
Life Cycles ◽  
Freshwater Ecosystems ◽  
Trematode Species ◽  
Host Life

The biodiversity of freshwater ecosystems globally still leaves much to be discovered, not least in the trematode parasite fauna they support. Echinostome trematode parasites have complex, multiple-host life-cycles, often involving migratory bird definitive hosts, thus leading to widespread distributions. Here, we examined the echinostome diversity in freshwater ecosystems at high latitude locations in Iceland, Finland, Ireland and Alaska (USA). We report 14 echinostome species identified morphologically and molecularly from analyses of nad1 and 28S rDNA sequence data. We found echinostomes parasitising snails of 11 species from the families Lymnaeidae, Planorbidae, Physidae and Valvatidae. The number of echinostome species in different hosts did not vary greatly and ranged from one to three species. Of these 14 trematode species, we discovered four species (Echinoparyphium sp. 1, Echinoparyphium sp. 2, Neopetasiger sp. 5, and Echinostomatidae gen. sp.) as novel in Europe; we provide descriptions for the newly recorded species and those not previously associated with DNA sequences. Two species from Iceland (Neopetasiger islandicus and Echinoparyphium sp. 2) were recorded in both Iceland and North America. All species found in Ireland are new records for this country. Via an integrative taxonomic approach taken, both morphological and molecular data are provided for comparison with future studies to elucidate many of the unknown parasite life cycles and transmission routes. Our reports of species distributions spanning Europe and North America highlight the need for parasite biodiversity assessments across large geographical areas.

scholarly journals Bombus (Pyrobombus) johanseni Sladen, 1919, a valid North American bumble bee species, with a new synonymy and comparisons to other “red-banded” bumble bee species in North America (Hymenoptera, Apidae, Bombini)

ZooKeys ◽  
2020 ◽  
Vol 984 ◽  
pp. 59-81
Author(s):  
Cory S. Sheffield ◽  
Ryan Oram ◽  
Jennifer M. Heron
Keyword(s):  
North America ◽  
North American ◽  
Dna Barcode ◽  
Molecular Data ◽  
The Arctic ◽  
Valid Species ◽  
Bumble Bee ◽  
Widespread Species ◽  
Old World ◽  
Northern Canada

The bumble bee (Hymenoptera, Apidae, Bombini, Bombus Latreille) fauna of the Nearctic and Palearctic regions are considered well known, with a few species occurring in both regions (i.e., with a Holarctic distribution), but much of the Arctic, especially in North America, remains undersampled or unsurveyed. Several bumble bee taxa have been described from northern North America, these considered either valid species or placed into synonymy with other taxa. However, some of these synonymies were made under the assumption of variable hair colour only, without detailed examination of other morphological characters (e.g., male genitalia, hidden sterna), and without the aid of molecular data. Recently, Bombus interacti Martinet, Brasero & Rasmont, 2019 was described from Alaska where it is considered endemic; based on both morphological and molecular data, it was considered a taxon distinct from B. lapponicus (Fabricius, 1793). Bombus interacti was also considered distinct from B. gelidus Cresson, 1878, a taxon from Alaska surmised to be a melanistic form of B. lapponicus sylvicola Kirby, 1837, the North American subspecies (Martinet et al. 2019). Unfortunately, Martinet et al. (2019) did not have DNA barcode sequences (COI) for females of B. interacti, but molecular data for a melanistic female specimen matching the DNA barcode sequence of the holotype of B. interacti have been available in the Barcodes of Life Data System (BOLD) since 2011. Since then, additional specimens have been obtained from across northern North America. Also unfortunate was that B. sylvicola var. johanseni Sladen, 1919, another melanistic taxon described from far northern Canada, was not considered. Bombus johanseni is here recognized as a distinct taxon from B. lapponicus sylvicola Kirby, 1837 (sensuMartinet et al. 2019) in the Nearctic region, showing the closest affinity to B. glacialis Friese, 1902 of the Old World. As the holotype male of B. interacti is genetically identical to material identified here as B. johanseni, it is placed into synonymy. Thus, we consider B. johanseni a widespread species occurring across arctic and subarctic North America in which most females are dark, with rarer pale forms (i.e., “interacti”) occurring in and seemingly restricted to Alaska. In addition to B. johanseni showing molecular affinities to B. glacialis of the Old World, both taxa also inhabit similar habitats in the arctic areas of both Nearctic and Palearctic, respectively. It is also likely that many of the specimens identified as B. lapponicus sylvicola from far northern Canada and Alaska might actually be B. johanseni, so that should be considered for future studies of taxonomy, distribution, and conservation assessment of North American bumble bees.

scholarly journals Cytogenetics and Genome Size Evolution in Illicium L.

HortScience ◽  
2018 ◽  
Vol 53 (5) ◽  
pp. 620-623
Author(s):  
Thomas G. Ranney ◽  
Connor F. Ryan ◽  
Lauren E. Deans ◽  
Nathan P. Lynch
Keyword(s):  
North America ◽  
Plant Breeding ◽  
Genome Size ◽  
Chromosome Numbers ◽  
Phylogenetic Analyses ◽  
Basal Angiosperm ◽  
Ploidy Levels ◽  
Genome Size Evolution ◽  
Size Evolution ◽  
Improvement Programs

Illicium is an ancient genus and member of the earliest diverging angiosperms known as the Amborellales, Nymphaeales, and Austrobaileyales (ANA) grade. These adaptable, broadleaf evergreen shrubs, including ≈40 species distributed throughout Asia and North America, are valued for diverse culinary, medicinal, and ornamental applications. The study of cytogenetics of Illicium can clarify various discrepancies and further elucidate chromosome numbers, ploidy, and chromosome and genome size evolution in this basal angiosperm lineage and provide basic information to guide plant breeding and improvement programs. The objectives of this study were to use flow cytometry and traditional cytology to determine chromosome numbers, ploidy levels, and relative genome sizes of cultivated Illicium. Of the 29 taxa sampled, including ≈11 species and one hybrid, 2C DNA contents ranged from 24.5 pg for Illicium lanceolatum to 27.9 pg for Illicium aff. majus. The genome sizes of Illicium species are considerably higher than other ANA grade lineages indicating that Illicium went through considerable genome expansion compared with sister lineages. The New World sect. Cymbostemon had a slightly lower mean 2C genome size of 25.1 pg compared with the Old World sect. Illicium at 25.9 pg, providing further support for recognizing these taxonomic sections. All taxa appeared to be diploid and 2n = 2x = 28, except for Illicium floridanum and Illicium mexicanum which were found to be 2n = 2x = 26, most likely resulting from dysploid reduction after divergence into North America. The base chromosome number of x = 14 for most Illicium species suggests that Illicium are ancient paleotetraploids that underwent a whole genome duplication derived from an ancestral base of x = 7. Information on cytogenetics, coupled with phylogenetic analyses, identifies some limitations, but also considerable potential for the development of plant breeding and improvement programs with this genus.

Sign in / Sign up

Export Citation Format

Share Document