Some rusts of Scirpus and allied genera

1972 ◽  
Vol 50 (12) ◽  
pp. 2579-2596 ◽  
Author(s):  
D. B. O. Savile
Keyword(s):  
United States ◽  
British Columbia ◽  
North America ◽  
Southeastern United States ◽  
Eastern North America ◽  
Scirpus Americanus

Amended descriptions, emphasizing widely neglected aeciospore characters, are given for Puccinia dulichii, P. angustata, P. eriophori var. eriophori and var. apargidii var. nov. (Queen Charlotte Is., British Columbia, on Eriophorum and Apargidium), P. eriophori-alpini,P. congdonii sp. nov. (California, on Scirpus congdonii), P. obtecta,P. osoyoosensis sp. nov. (on Scirpus americanus and S. olneyi), P. liberta, P. fimbristylidis, Uromyces eleocharidis, P. mcclatchieana, U. americanus var. americanus and var. californicus var. nov. (California, on S. californiens), U. lineolatus ssp. lineolatus and ssp. nearcticus ssp. nov. Puccinia angustatoides on Rhynchospora is also discussed because it has been erroneously included in P. angustata.Aecidium ageratinae sp. nov. (on Ageratina spp. = Eupatorium sect. Eximbricata, in eastern North America), and Aecidium eupatorii-rotundifolii sp. nov. (on Eupatorium rotundifolium in southeastern United States) are distinguished from the aecial state of P. eleocharidis. Some aspects of the classification of Scirpus and its allies are briefly discussed in relation to their rusts.

CHIRONOMIDAE (DIPTERA) ASSOCIATED WITH MYRIOPHYLLUM SPICATUM IN OKANAGAN VALLEY LAKES, BRITISH COLUMBIA

1983 ◽  
Vol 115 (11) ◽  
pp. 1545-1546 ◽  
Author(s):  
B.J. Kangasniemi ◽  
D. R. Oliver
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
British Columbia ◽  
North America ◽  
Myriophyllum Spicatum ◽  
The United States ◽  
Eastern North America ◽  
Aquatic Weed ◽  
Okanagan Valley

Eurasian water milfoil, Myriophyllum spicatum Linnaeus, was introduced into eastern North America late in the nineteenth century. It has spread and developed into a major aquatic weed in many areas of the United states and Canada (Aiken et al. 1979; Reed 1977). In British Columbia, it was first observed in the Vernon Arm of Okanagan Lake in 1970 and had spread to all major 1,akes in the Okanagan Valley by 1976 (Newroth 1979).

scholarly journals Chloropid flies (Diptera, Chloropidae) associated with pitcher plants in North America

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4491
Author(s):  
Julia J. Mlynarek ◽  
Terry A. Wheeler
Keyword(s):  
United States ◽  
North America ◽  
Southeastern United States ◽  
Eastern North America ◽  
Northern California ◽  
Pitcher Plants ◽  
Pitcher Plant

We review the taxonomy and ecology of Chloropidae (Diptera) associated with pitcher plants (Sarraceniaceae) in North America.Tricimba wheeleriMlynarek sp.n. is described from the pitchers ofSarracenia alataAlph.Wood andS. leucophyllaRaf. in the southeastern United States (Alabama, Mississippi).Aphanotrigonum darlingtoniae(Jones) associated withDarlingtonia californicaTorr. in northern California is redescribed, including the first description of male genitalic characters. A lectotype is designated forA. darlingtoniae. Published records of other species ofTricimbaLioy in pitcher plants in North America are considered accidental or facultative occurrences; published records ofAphanotrigonumDuda as pitcher plant associates in eastern North America are probably errors in identification.

Foliicolous bryophytes and lichens of Thuja plicata in western British Columbia

1973 ◽  
Vol 51 (3) ◽  
pp. 571-580 ◽  
Author(s):  
Dale H. Vitt ◽  
Michael Ostafichuk ◽  
Irwin M. Brodo
Keyword(s):  
United States ◽  
British Columbia ◽  
North America ◽  
Southeastern United States ◽  
Thuja Plicata ◽  
First Report ◽  
Northwestern North America ◽  
North America North ◽  
Lichen Flora

Four species of mosses, all in the genus Orthotrichum; 1 species of hepatics; and 16 species of lichens compose the foliicolous bryophyte and lichen flora of Thuja plicata L. leaves in certain areas of western British Columbia. This is the first report of foliicolous mosses and hepatics for North America, north of the tropical and subtropical regions of the southeastern United States. The taxonomy of the four species of Orthotrichum is discussed and a key given differentiating the species.All of the species that have been found on Thuja leaves except perhaps Catillaria bouteillei are facultative foliicolous species and occur on leaves, only in scattered areas of northwestern North America. Two taxa of lichens, Catillaria bouteillei (Desm.) Zahlbr. and Cetrelia cetrarioides (Del. ex Duby) W. Culb. & C. Culb. (perlatolic acid strain) are reported as new to Canada.

Modeling Clovis Landscape Use and Recovery Bias in the Southeastern United States Using the Paleoindian Database of the Americas (PIDBA)

2016 ◽  
Vol 81 (4) ◽  
pp. 697-716 ◽  
Author(s):  
D. Shane Miller
Keyword(s):  
United States ◽  
North America ◽  
Southeastern United States ◽  
Raw Material ◽  
Eastern North America ◽  
National Scale ◽  
Surface Sites ◽  
Material Sources ◽  
Accurate Reflection ◽  
Lithic Raw Material

In eastern North America, there are few stratified sites dating to the Late Pleistocene epoch (> 11,700 cal B.P.). Instead, researchers have relied on the distribution of surface sites and isolated finds to make inferences about how the early inhabitants of the region used the landscape. While proxies for modern recovery bias have been found to affect artifact recovery at a national scale, in the southeastern United States, I argue, they are poor predictors for the frequency of Clovis type bifaces (ca. 13,250–12,850 cal B.P.) from counties in the southeastern United States as reported in the Paleoindian Database of the Americas (PIDBA). Instead, counties with the highest density of Clovis bifaces are near sources of lithic raw material, and in particular the intersection of major rivers, physiographic boundaries, and lithic raw material sources. I contend that these locations could represent seasonal aggregation loci. Alternatively, they could reflect areas where lithic raw material is more readily available, which may have resulted in higher rates of artifact discard. Determining which of these hypotheses is a more accurate reflection of past human behavior requires that we untangle the degree to which the amount of time people spent at these locations was successive versus coeval.

A classification of the deciduous forest of eastern North America

Vegetatio ◽  
1989 ◽  
Vol 80 (2) ◽  
pp. 167-181 ◽  
Author(s):  
Carl D. Monk ◽  
Donald W. Imm ◽  
Robert L. Potter ◽  
Geoffrey G. Parker
Keyword(s):  
North America ◽  
Deciduous Forest ◽  
Eastern North America

Distribution of the middorsal stripe dimorphism in the wood frog, Rana sylvatica, in eastern North America

1980 ◽  
Vol 58 (9) ◽  
pp. 1643-1651 ◽  
Author(s):  
Frederick W. Schueler ◽  
Francis R. Cook
Keyword(s):  
United States ◽  
North America ◽  
Rana Sylvatica ◽  
Wood Frog ◽  
Eastern North America ◽  
Hudson Bay ◽  
Northeastern United States ◽  
Southern Ontario ◽  
Maritime Canada ◽  
Eurasian Species

The frequency of the middorsally striped morph of Rana sylvatica in Ontario and Manitoba varies from absence in southern Ontario to 80% on the coast of Hudson Bay, with a general value of 20–30% in the boreal forest, a rise to 50% on the forest–grassland ecotone in southern Manitoba, and a decline westward to 20% on the edge of the prairies. This morph is rare in the northeastern United States and Maritime Canada. The suggested relationship between its frequency and the "grassiness" of the background on which predators view it is reexamined, and it is suggested that a linkage with earlier transformation as demonstrated in Eurasian species may explain certain anomalies.

scholarly journals Progression of Sugarberry (Celtis laevigata) Dieback and Mortality in the Southeastern United States

2021 ◽  
Author(s):  
Emilee M Poole ◽  
Michael D Ulyshen ◽  
Scott Horn ◽  
Patrick Anderson ◽  
Chip Bates ◽  
...  
Keyword(s):  
United States ◽  
North America ◽  
Invasive Plants ◽  
Southeastern United States ◽  
Public Spaces ◽  
Canopy Gaps ◽  
Leaf Fall ◽  
Affected Area ◽  
Celtis Laevigata ◽  
Branch Dieback

Abstract The southeastern United States has been experiencing unexplained sugarberry (Celtis laevigata) mortality for over a decade, representing one of the most severe and widespread Celtis mortality episodes ever reported from North America. Here we describe external symptoms, progression of mortality, and the known geographic extent of the problem. More than half of all trees monitored at one site within the affected area died over five years of observation. Although many trees died within a year of first exhibiting symptoms (e.g., small yellow leaves, branch dieback, premature leaf fall), many others continued living for years after becoming symptomatic. A preliminary insecticide trial found no improvements in survivorship among trees treated with insecticides, emamectin benzoate and imidacloprid, relative to control trees. Our findings suggest the problem will likely continue and become more widespread in the coming years. Study Implications Sugarberry mortality in urban and forested environments is an ongoing problem that has the potential to spread throughout the southeastern United States and perhaps more widely, depending on the susceptibility of other native Celtis species. Many trees die within a year of first showing external symptoms, whereas others can live for many years after appearing symptomatic. Declining trees in rights-of-way and public spaces are presenting costly hazards to cities, and canopy gaps in natural areas are likely to facilitate the establishment and spread of invasive plants. Studies aimed at determining the cause of this problem are urgently needed.

Do centers of origin have a center?

Paleobiology ◽  
1981 ◽  
Vol 7 (3) ◽  
pp. 305-307 ◽  
Author(s):  
John C. Briggs
Keyword(s):  
United States ◽  
North America ◽  
Southeastern United States ◽  
Important Criterion ◽  
Centers Of Origin ◽  
Single Region ◽  
Evolutionary Radiation ◽  
A Current ◽  
Considerable Intensity

A current question being debated with considerable intensity is whether or not certain geographic areas act as centers of evolutionary radiation and supply species to other areas that are less active or less effective in an evolutionary sense. Darwin (1859) was the first to write about centers of origin which he called “single centers of creation.” He argued that each species was first produced within a single region and that it subsequently migrated from that area as far as its powers of migration and subsistence under past and present conditions permitted. Adams (1902), in discussing the influence of the southeastern United States as a center of distribution for the flora and fauna of North America, provided a series of criteria for the determination of “centers of dispersal.” His first, and evidently most important criterion was the location of “the greatest differentiation of a type.”

scholarly journals The Interannual Variability of the Haines Index over North America

2013 ◽  
Vol 52 (11) ◽  
pp. 2396-2409 ◽  
Author(s):  
Lejiang Yu ◽  
Shiyuan Zhong ◽  
Xindi Bian ◽  
Warren E. Heilman ◽  
Joseph J. Charney
Keyword(s):  
United States ◽  
Pacific Ocean ◽  
North America ◽  
Interannual Variability ◽  
Large Scale ◽  
Southern Oscillation ◽  
Southeastern United States ◽  
Lower Atmosphere ◽  
The Arctic ◽  
Fire Weather Index

AbstractThe Haines index (HI) is a fire-weather index that is widely used as an indicator of the potential for dry, low-static-stability air in the lower atmosphere to contribute to erratic fire behavior or large fire growth. This study examines the interannual variability of HI over North America and its relationship to indicators of large-scale circulation anomalies. The results show that the first three HI empirical orthogonal function modes are related respectively to El Niño–Southern Oscillation (ENSO), the Arctic Oscillation (AO), and the interdecadal sea surface temperature variation over the tropical Pacific Ocean. During the negative ENSO phase, an anomalous ridge (trough) is evident over the western (eastern) United States, with warm/dry weather and more days with high HI values in the western and southeastern United States. During the negative phase of the AO, an anomalous trough is found over the western United States, with wet/cool weather and fewer days with high HI, while an anomalous ridge occurs over the southern United States–northern Mexico, with an increase in the number of days with high HI. After the early 1990s, the subtropical high over the eastern Pacific Ocean and the Bermuda high were strengthened by a wave train that was excited over the tropical western Pacific Ocean and resulted in warm/dry conditions over the southwestern United States and western Mexico and wet weather in the southeastern United States. The above conditions are reversed during the positive phase of ENSO and AO and before the early 1990s.

Sign in / Sign up

Export Citation Format

Share Document