scholarly journals A Conservation Evaluation of Smooth Goosefoot, Chenopodium subglabrum (Chenopodiaceae), in Canada

2006 ◽  
Vol 120 (3) ◽  
pp. 335 ◽  
Author(s):  
Diana Bizecki Robson
Keyword(s):  
North America ◽  
Seed Bank ◽  
Population Trend ◽  
Annual Species ◽  
Fire Control ◽  
Distribution Limit ◽  
Dune Stabilization ◽  
Northern Distribution ◽  
Conservation Evaluation ◽  
Considerable Loss

Smooth Goosefoot (Chenopodium subglabrum) is restricted to North America and reaches its northern distribution limit in Alberta, Saskatchewan and Manitoba. The habitat of Chenopodium subglabrum contains some element of active sand. It is commonly found on the stabilizing edges of active dunes as well as dune blowouts, and occasionally on bare or recently disturbed sand plains. Chenopodium subglabrum is a sexually reproducing annual species with seeds that may remain in the seed bank for several years, waiting for the conditions it favours for germination. Germination of this species is erratic, possibly in response to moisture, making the overall population trend difficult to determine. The estimated population in Canada is likely between 5000 and 10000 individuals. There has been considerable loss of habitat as dunes become vegetated. The processes of dune stabilization and fire control threaten survival of this species.

Genus Tinotus (Coleoptera: Staphylinidae, Aleocharinae) from America north of Mexico: review of the types, distribution records, and key to species

2002 ◽  
Vol 134 (3) ◽  
pp. 281-298 ◽  
Author(s):  
Jan Klimaszewski ◽  
Georges Pelletier ◽  
Jon Sweeney
Keyword(s):  
British Columbia ◽  
North America ◽  
New Brunswick ◽  
Key To Species ◽  
Distribution Limit ◽  
Palearctic Region ◽  
Northern Distribution ◽  
First Time ◽  
Unrecorded Species

AbstractSpecies of the genus Tinotus Sharp of America north of Mexico are reviewed. Five species are recognized: T. caviceps Casey, T. imbricatus Casey, T. morion (Gravenhorst), T. parvicornis Casey, and T. trisectus Casey. The genus Tinotus is recorded from Canada for the first time and is represented in the country by two previously unrecorded species: T. morion (Gravenhorst), introduced from the Palearctic region, and T. caviceps Casey, described from Nevada and subsequently reported from California, Idaho, Indiana, Iowa, and Montana. Tinotus morion was previously listed in North America from Connecticut and Nevada (unverified records), but until now it was unknown from Canada. Here it is reported as new for New Brunswick, Quebec, Ontario, Alberta, and British Columbia. Tinotus caviceps is found for the first time in southern Quebec where it probably reaches its northern distribution limit. The following synonymies are established, with the first names being valid: T. caviceps Casey (= T. pallidus Casey), T. imbricatus Casey (= T. amplus Notman, T. brunnipes Notman), T. parvicornis Casey (= T. planulus Notman), and T. trisectus Casey (= T. binarius Casey, T. brunneus Casey, and T. lateralis Notman). A new lectotype is designated for T. brunnipes Notman. The lectotype specimens have been dissected and their genital features illustrated. Diagnoses, illustrations, and a key to identify species from America north of Mexico are provided.

Impact of Alien Plants on Grant Basin Rangelands

1996 ◽  
Vol 10 (2) ◽  
pp. 384-391 ◽  
Author(s):  
James A. Young ◽  
William S. Longland
Keyword(s):  
North America ◽  
Great Basin ◽  
Alien Plants ◽  
Western North America ◽  
Biological Functions ◽  
Annual Species ◽  
Weed Species ◽  
Model Ecosystem ◽  
Alien Weed ◽  
The Impact

Our purpose is to discuss the impact of alien plants on rangeland ecosystems of the Great Basin in terms of their effects on biological functions. The sagebrush/bunchgrass ranges of western North America are used as a model ecosystem for the impact of alien plants. Alien weed species have been introduced in successive waves, with the success of each new introduction dependent on how well adapted to the environment and how competitive the new weed is with those previously introduced. Annual species have been successful across extensive areas of Great Basin rangelands. Biennial and short- and long-lived perennial introductions have been restricted to much more specific habitats. Alien plants impact rangelands through stand renewal and successional processes. Alien weeds can cause such processes to be accelerated and/or truncated depending on the species and range site.

A seed bank pathogen causes seedborne disease:Pyrenophora semeniperdaon undispersed grass seeds in western North America

2008 ◽  
Vol 30 (4) ◽  
pp. 525-533 ◽  
Author(s):  
Susan E. Meyer ◽  
Julie Beckstead ◽  
Phil S. Allen ◽  
Duane C. Smith
Keyword(s):  
North America ◽  
Seed Bank ◽  
Western North America

scholarly journals Multi-source analysis reveals latitudinal and altitudinal shifts in range of Ixodes ricinus at its northern distribution limit

2011 ◽  
Vol 4 (1) ◽  
Author(s):  
Solveig Jore ◽  
Hildegunn Viljugrein ◽  
Merete Hofshagen ◽  
Hege Brun-Hansen ◽  
Anja B Kristoffersen ◽  
...  
Keyword(s):  
Ixodes Ricinus ◽  
Source Analysis ◽  
Distribution Limit ◽  
Northern Distribution

scholarly journals Distribution and natural history notes on Tachymenis chilensis chilensis (Schlegel, 1837) (Reptilia: Serpentes: Dipsadidae) in Argentina

Check List ◽  
2012 ◽  
Vol 8 (5) ◽  
pp. 919 ◽  
Author(s):  
Alejandro R. Giraudo ◽  
Félix Vidoz ◽  
Vanesa Arzamendia ◽  
Santiago J. Nenda
Keyword(s):  
Natural History ◽  
Barrier Effect ◽  
History Data ◽  
Mountain Ranges ◽  
Distribution Limit ◽  
The Andes ◽  
Northern Distribution ◽  
First Time ◽  
Latitudinal Range ◽  
Prey Items

We revisit the distribution and natural history data of Tachymenis chilensis chilensis (Schlegel, 1837) in Argentina based on compiled and novel records, extending its northern and southern distribution from the previously known localities in Argentina. We recorded two prey items in Argentinean populations: Rhinella rubropunctata, reported for the first time, and Liolaemus pictus. Tachymenis c. chilensis is mainly found in forested habitats, generally near wetlands with abundant populations of amphibians. The latitudinal range occupied by T. c. chilensis in Argentina is similar to that in Chile, but its northern distribution limit reaches the lowest latitudes in Chile. This is probably due to the higher humidity levels in the western slopes of the Andes and the barrier effect of the highest mountain ranges in this area.

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