SHORT COMMUNICATION: Elemental content of animal licks along the eastern slopes of the Rocky Mountains in southern Alberta, Canada

1996 ◽  
Vol 76 (4) ◽  
pp. 509-512 ◽  
Author(s):  
J. F. Dormaar ◽  
B. D. Walker
Keyword(s):  
Hydrogen Peroxide ◽  
Key Words ◽  
Rocky Mountains ◽  
Short Communication ◽  
Landscape Management ◽  
Elemental Content ◽  
Rock Face ◽  
Southern Alberta ◽  
Sodium Magnesium ◽  
Salt Licks

A number of animal licks, representing dry earth exposures, muck licks, and rock face licks, were sampled and analysed for 12 elements by using a sulphuric acid-hydrogen peroxide method to simulate digesta. The various types of licks may serve different needs. Sodium, magnesium, manganese, iron, and copper may draw animals to specific sites. Key words: Salt licks, ungulates, landscape management, Rocky Mountains

SHORT COMMUNICATION: Difficulties in using 137Cs to measure erosion in stubble-mulched soil

1995 ◽  
Vol 75 (3) ◽  
pp. 357-359 ◽  
Author(s):  
E. Bremer ◽  
H. H. Janzen ◽  
E. de Jong
Keyword(s):  
Soil Erosion ◽  
Key Words ◽  
Short Communication ◽  
Crop Rotations ◽  
Present Evidence ◽  
Southern Alberta ◽  
Communication Difficulties ◽  
Cesium 137

Soil erosion may be difficult to quantify from redistribution of 137Cs at sites where stubble-mulch techniques were adopted prior to 137Cs deposition, because appreciable 137Cs may have been transported before it was mixed into the soil Ap layer. We present evidence that this occurred in two long-term cropping experiments in southern Alberta. Key words: Cesium-137, tillage, long-term crop rotations, fallow

SHORT COMMUNICATION: Herbicides in surface runoff and groundwater under surface irrigation in southern Alberta

1995 ◽  
Vol 75 (1) ◽  
pp. 145-148 ◽  
Author(s):  
J. J. Miller ◽  
N. Foroud ◽  
B. D. Hill ◽  
C. W. Lindwall
Keyword(s):  
Key Words ◽  
Surface Runoff ◽  
Short Communication ◽  
Surface Irrigation ◽  
Groundwater Samples ◽  
Southern Alberta

In 1991, up to 38 g L−1 hexazinone was found in 50% of surface runoff and 27% of groundwater samples at Lethbridge. No herbicides were detected in surface runoff from irrigation at Taber, but 2,4-D, bromoxynil, dicamba, mecoprop, MCPA and diclofop were found in 48, 34, 21, 16, 13 and 9%, respectively, of groundwater samples, and bromoxynil exceeded the Canadian drinking guideline (5.0 μg L−1) in 11% of samples. Key words: Herbicides, surface irrigation, surface runoff, groundwater

Effect of climatic conditions on the annual activity and hibernation cycle of Richardson's ground squirrels and Columbian ground squirrels

1977 ◽  
Vol 55 (4) ◽  
pp. 693-703 ◽  
Author(s):  
Gail R. Michener
Keyword(s):  
Rocky Mountains ◽  
Climatic Conditions ◽  
Ground Squirrels ◽  
Active Season ◽  
Southern Alberta ◽  
Annual Activity ◽  
The Times ◽  
Columbian Ground Squirrels ◽  
Spring Emergence ◽  
Species Ecology

In 1975 and 1976 the times of spring emergence, breeding, and entry into hibernation were compared for Spermophilus richardsonii and S. columbianus in an area of sympatry in the foothills of the southern Alberta Rocky Mountains. Both species emerged earlier in 1976, which had a warmer than normal spring, than in 1975, which had a cooler than normal spring. In both years S. richardsonii emerged earlier than S. columbianus and remained active longer. Juvenile S. richardsonii entered hibernation when 17–20 weeks old whereas juvenile S. columbianus were 10–11 weeks old. Yearling S. richardsonii bred, whereas yearling S. columbianus did not. Breeding success affected the time of entry into hibernation but not the time of emergence from hibernation in the next spring. A possible relationship between the periodic arousals during hibernation and the emergence pattern of squirrels in spring is discussed. The significance of flexibility of spring emergence, length of the active season, and age at breeding to survival and species ecology is considered.

Spatial and temporal variations of fire regimes in the Canadian Rocky Mountains and Foothills of southern Alberta

2016 ◽  
Vol 25 (11) ◽  
pp. 1117 ◽  
Author(s):  
Marie-Pierre Rogeau ◽  
Mike D. Flannigan ◽  
Brad C. Hawkes ◽  
Marc-André Parisien ◽  
Rick Arthur
Keyword(s):  
Rocky Mountains ◽  
Fire History ◽  
Fire Severity ◽  
Ecological Integrity ◽  
Fire Regimes ◽  
Temporal Variations ◽  
Fire Season ◽  
Canadian Rocky Mountains ◽  
Southern Alberta ◽  
Fire Exclusion

Like many fire-adapted ecosystems, decades of fire exclusion policy in the Rocky Mountains and Foothills natural regions of southern Alberta, Canada are raising concern over the loss of ecological integrity. Departure from historical conditions is evaluated using median fire return intervals (MdFRI) based on fire history data from the Subalpine (SUB), Montane (MT) and Upper Foothills (UF) natural subregions. Fire severity, seasonality and cause are also documented. Pre-1948 MdFRI ranged between 65 and 85 years in SUB, between 26 and 35 years in MT and was 39 years in UF. The fire exclusion era resulted in a critical departure of 197–223% in MT (MdFRI = 84–104 years). The departure in UF was 170% (MdFRI = 104 years), while regions of continuous fuels in SUB were departed by 129% (MdFRI = 149 years). The most rugged region of SUB is within its historical range of variation with a departure of 42% (MdFRI = 121 years). More mixed-severity burning took place in MT and UF. SUB and MT are in a lightning shadow pointing to a predominance of anthropogenic burning. A summer fire season prevails in SUB, but occurs from spring to fall elsewhere. These findings will assist in developing fire and forest management policies and adaptive strategies in the future.

scholarly journals Asexual Propagation of Eggplant (Solanum melongena L.) through Encapsulated Axillary Buds

1970 ◽  
Vol 19 (2) ◽  
pp. 263-288 ◽  
Author(s):  
A.K.M. N. Huda ◽  
, M.A. Bari ◽  
M. Rahman
Keyword(s):  
Key Words ◽  
Plant Tissue ◽  
Short Communication ◽  
Solanum Melongena ◽  
Axillary Buds ◽  
Synthetic Seed ◽  
Asexual Propagation

 Key words: Auxillary buds, Eggplant, Encapsulation, Synthetic seed D.O.I. 10.3329/ptcb.v19i2.5445 Plant Tissue Cult. & Biotech. 19(2): 263-288, 2009 (December)       - Short communication

Oxidative addition chemistry of dimethyl(dipyridyl ketone)platinum(II)

2005 ◽  
Vol 83 (6-7) ◽  
pp. 595-605 ◽  
Author(s):  
Fenbao Zhang ◽  
Michael E Broczkowski ◽  
Michael C Jennings ◽  
Richard J Puddephatt
Keyword(s):  
Hydrogen Peroxide ◽  
Key Words ◽  
Acetyl Chloride ◽  
Oxidative Addition ◽  
Protonated Form ◽  
Supramolecular Polymer ◽  
Hydrolysis Of ◽  
Mecn Solution ◽  
Dipyridyl Ketone ◽  
Methyl Triflate

The dimethylplatinum(II) complex [PtMe2(DPK)] (DPK = di-2-pyridyl ketone) undergoes easy oxidative addition to give platinum(IV) complexes. For example, reaction of [PtMe2(DPK)] with MeI gave [PtIMe3(DPK)], reaction with N-chlorosuccinimide in methanol gave [PtCl(OMe)Me2(DPK)], and reaction with [FN(CH2CH2)2NCH2Cl][BF4]2 in MeCN gave [PtF(NCMe)Me2(DPK)][BF4]. In several cases, the ketone group of the DPK ligand took part in the reactions. For example, oxidation of [PtMe2(DPK)] by air or hydrogen peroxide gave [Pt(OH)Me2(DPKOH)] (DPKOH = κ3-NN′O-(2-C5H4N)2C(OH)O), which reacted with HCl to give [PtClMe2(DPKOH)] or with excess acetyl chloride to give [PtCl2Me2(DPK)]. Reaction of [PtMe2(DPK)] with methyl triflate in MeCN solution gave [PtMe3(NCMe)(DPK)][OTf], which reacted with more MeOTf in the presence of base to give [PtMe3{DPC(OMe)2}][OTf], where DPC(OMe)2 = κ3-NN′O-(2-C5H4N)2C(OMe)2. Hydrolysis of [PtF(NCMe)Me2(DPK)][BF4] gave [Pt{NHC(=O)Me}Me2(DPKOH)], which crystallized in partially protonated form as an unusual supramolecular polymer [Pt{NHC(=O)Me}Me2(DPKOH)]·0.5HBF4.Key words: platinum, oxidative addition, ketone, pyridyl.

Nucleation during primary succession in the Canadian Rockies

1993 ◽  
Vol 71 (8) ◽  
pp. 1093-1096 ◽  
Author(s):  
D. J. Blundon ◽  
D. A. MacIsaac ◽  
M. R. T. Dale
Keyword(s):  
British Columbia ◽  
Nitrogen Fixation ◽  
Key Words ◽  
Rocky Mountains ◽  
Primary Succession ◽  
The Other ◽  
Pioneer Species ◽  
Canadian Rocky Mountains ◽  
Successional Species ◽  
Key Words Colonization

A study of nucleation during primary succession was carried out on age sequences of communities at two sites in the Canadian Rocky Mountains: one at the Mount Robson moraines, British Columbia, the other at Southeast Lyell Glacier, Alberta. The study concentrated on the associations of species with the nitrogen-fixing plants Hedysarum boreale var. mackenzii at Mount Robson moraines and Dryas drummondii at Southeast Lyell Glacier because those plants might serve as nuclei for colonization by other species, thus facilitating succession. The data show that recruitment of later successional species is greater in patches of the two pioneer species, but the fact that recruitment takes place away from the plants also suggests that although there is nucleation, it is not necessary for succession at these sites. Key words: colonization, nitrogen fixation, nucleation, succession.

Residue detections in soil and shallow groundwater after long-term herbicide applications in southern Alberta

1995 ◽  
Vol 75 (3) ◽  
pp. 349-356 ◽  
Author(s):  
J. J. Miller ◽  
B. D. Hill ◽  
C. Chang ◽  
C. W. Lindwall
Keyword(s):  
Drinking Water ◽  
Key Words ◽  
Level Set ◽  
Water Samples ◽  
Shallow Groundwater ◽  
Herbicide Residues ◽  
Southern Alberta

After herbicide applications for 1–24 yr, there were no detectable residues of glyphosate, dicamba, 2,4-D, bromoxynil or methylchlorophenoxyacetic acid (MCPA) in soil at two long-term tillage sites and one long-term manured site. The only detectable residues in soil were of diclofop and triallate. Residues of bromoxynil, diclofop and MCPA but not dicamba, 2,4-D or triallate, were detected in the groundwater at the manured site. Diclofop was detected in 6% and bromoxynil and MCPA in 2% of 84 water samples collected at the manured site. Maximum concentrations of bromoxynil (6.5 μg L−1) and diclofop (47 μg L−1) in the groundwater at the manured site exceeded levels set by the Canadian drinking water guidelines. Long-term application of herbicides has not caused accumulation of harmful residues in southern Alberta soils, but the presence of certain herbicides in the groundwater at concentrations above the level set by the drinking water guidelines is cause for concern. Key words: Herbicide residues, tillage, manure, soil, groundwater

Establishment of Bombus spp. (Hymenoptera: Apidae) in Artificial Domiciles in Southern Alberta

1960 ◽  
Vol 92 (11) ◽  
pp. 868-872 ◽  
Author(s):  
G. A. Hobbs ◽  
J. F. Virostek ◽  
W. O. Nummi
Keyword(s):  
Rocky Mountains ◽  
Food Preference ◽  
Thin Metal ◽  
Bumble Bees ◽  
Bumble Bee ◽  
Grassland Species ◽  
Metal Plates ◽  
Southern Alberta ◽  
Flax Straw

Since Fye and Medler (1954) described methods of obtaining establishment of bumble bee queens in artificial domiciles in Wisconsin, we have been obtaining colonies for pollination and food-preference studies by similar means. The following is a summary of our experiences with the Fye-Medler type of above-ground domicile. Most of the trials were conducted in the prairie region of southern Alberta with grassland species of bumble bees; one was conducted in the foothills of the Rocky Mountains in southern Alberta, where species peculiar to treed areas are common. Because bumble bee queens make their nests in deserted mice nests, domiciles with entrance holes 1 ¼ inches in diameter were partly filled with roughed-up flax straw and set out in the fall to first provide homes for mice. The following spring, the mice were expelled and mice-excluders (thin metal plates 2 inches square, with holes 5/8 inch in diameter) were nailed over the original holes (cf. Fye and Medler, 1954).

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