Orius insidiosus (Hemiptera: Anthocoridae) in the lower Fraser Valley, British Columbia, Canada,

2006 ◽  
Vol 138 (4) ◽  
pp. 590-593 ◽  
Author(s):  
David R. Gillespie ◽  
D.M.J. Quiring
Keyword(s):  
Biological Control ◽  
British Columbia ◽  
Competitive Exclusion ◽  
North American Species ◽  
Indigenous Species ◽  
Orius Insidiosus ◽  
Lower Fraser Valley ◽  
Low Incidence ◽  
Non Indigenous Species ◽  
Fraser Valley

AbstractPopulations of Orius spp. were surveyed in the lower Fraser Valley, British Columbia, to determine whether O. insidiosus Say, a non-indigenous species, had established in the region as a result of being released inside greenhouses for biological control of pests. Field collections over 8 years revealed a low incidence of O. insidiosus (10 specimens, <1% of total Orius spp. collected). Numbers in collections did not increase, and collection localities did not become more widespread over the 8 years of survey. Competitive exclusion and temperature and diapause thresholds are discussed as possible mechanisms limiting the establishment of this otherwise widespread North American species.

scholarly journals Low levels of nitryl chloride at ground level: nocturnal nitrogen oxides in the Lower Fraser Valley of British Columbia

2018 ◽  
Vol 18 (9) ◽  
pp. 6293-6315 ◽  
Author(s):  
Hans D. Osthoff ◽  
Charles A. Odame-Ankrah ◽  
Youssef M. Taha ◽  
Travis W. Tokarek ◽  
Corinne L. Schiller ◽  
...  
Keyword(s):  
British Columbia ◽  
Nitrogen Oxides ◽  
Ground Level ◽  
Ambient Air ◽  
Data Set ◽  
Mixing Ratios ◽  
Nitryl Chloride ◽  
Short Period ◽  
Lower Fraser Valley ◽  
Fraser Valley

Abstract. The nocturnal nitrogen oxides, which include the nitrate radical (NO3), dinitrogen pentoxide (N2O5), and its uptake product on chloride containing aerosol, nitryl chloride (ClNO2), can have profound impacts on the lifetime of NOx (= NO + NO2), radical budgets, and next-day photochemical ozone (O3) production, yet their abundances and chemistry are only sparsely constrained by ambient air measurements. Here, we present a measurement data set collected at a routine monitoring site near the Abbotsford International Airport (YXX) located approximately 30 km from the Pacific Ocean in the Lower Fraser Valley (LFV) on the west coast of British Columbia. Measurements were made from 20 July to 4 August 2012 and included mixing ratios of ClNO2, N2O5, NO, NO2, total odd nitrogen (NOy), O3, photolysis frequencies, and size distribution and composition of non-refractory submicron aerosol (PM1). At night, O3 was rapidly and often completely removed by dry deposition and by titration with NO of anthropogenic origin and unsaturated biogenic hydrocarbons in a shallow nocturnal inversion surface layer. The low nocturnal O3 mixing ratios and presence of strong chemical sinks for NO3 limited the extent of nocturnal nitrogen oxide chemistry at ground level. Consequently, mixing ratios of N2O5 and ClNO2 were low (< 30 and < 100 parts-per-trillion by volume (pptv) and median nocturnal peak values of 7.8 and 7.9 pptv, respectively). Mixing ratios of ClNO2 frequently peaked 1–2 h after sunrise rationalized by more efficient formation of ClNO2 in the nocturnal residual layer aloft than at the surface and the breakup of the nocturnal boundary layer structure in the morning. When quantifiable, production of ClNO2 from N2O5 was efficient and likely occurred predominantly on unquantified supermicron-sized or refractory sea-salt-derived aerosol. After sunrise, production of Cl radicals from photolysis of ClNO2 was negligible compared to production of OH from the reaction of O(1D) + H2O except for a short period after sunrise.

The Spatiotemporal Response of Summertime Tropospheric Ozone to Changes in Local Precursor Emissions in the Lower Fraser Valley, British Columbia

2018 ◽  
Vol 56 (5) ◽  
pp. 303-321
Author(s):  
Bruce Ainslie ◽  
Nadya Moisseeva ◽  
Roxanne Vingarzan ◽  
Corinne Schiller ◽  
Douw Steyn ◽  
...  
Keyword(s):  
British Columbia ◽  
Tropospheric Ozone ◽  
Lower Fraser Valley ◽  
Spatiotemporal Response ◽  
Fraser Valley

Core aeration of sand-based putting greens in the Lower Fraser Valley of British Columbia

2007 ◽  
Vol 87 (1) ◽  
pp. 103-111 ◽  
Author(s):  
P. Sorokovsky ◽  
M. Krzic ◽  
M D Novak
Keyword(s):  
British Columbia ◽  
Surface Area ◽  
Management Practices ◽  
Penetration Resistance ◽  
Water Infiltration ◽  
Putting Greens ◽  
Study Objective ◽  
Soil Penetration Resistance ◽  
Lower Fraser Valley ◽  
Fraser Valley

Core aeration, a management practice originally developed for soil-based putting greens, is still commonly used on sand-based greens. The study objective was to determine the effects of core aeration on soil properties of sand-based putting greens in the Lower Fraser Valley of British Columbia. The experiment was laid out as a randomized complete block design with three replications. The study treatments were regular management practices, including core aeration (CA) carried out in spring and late summer, and regular management practices, but no core aeration (NCA). Each core aeration event impacted 5% of the surface area. Treatments with and without core aeration had similar soil organic matter content, root weight density, and soil bulk density. The CA treatment was generally drier than NCA. Water infiltration was greater on CA than NCA, but only for 1 mo following core aeration. Core aeration generally reduced soil penetration resistance within the mat layer relative to treatment without this practice. On both treatments, soil penetration resistance consistently exceeded 4000 kPa below about 13 cm depth preventing deeper root growth. The limited benefits of the low-surface-area-impact core aeration on the maturing sand-based putting greens in a humid maritime climate suggest that this practice might not be worth doing (at a low surface area impact); however, additional, more detailed studies are needed to confirm this. Key words: Turf management, golf course management, soil penetration resistance, water infiltration

GROUPING OF LOWER FRASER VALLEY SOILS OF BRITISH COLUMBIA BY NUMERICAL METHODS

1973 ◽  
Vol 53 (4) ◽  
pp. 435-443
Author(s):  
B. KLOOSTERMAN ◽  
L. M. LAVKULICH
Keyword(s):  
British Columbia ◽  
Cluster Analysis ◽  
Survey Data ◽  
Soil Classification ◽  
Data File ◽  
Soil Survey ◽  
Data Sets ◽  
Lower Fraser Valley ◽  
Average Profile ◽  
Fraser Valley

The British Columbia Soil Survey Data File was used to numerically classify soils of the Lower Fraser Valley of British Columbia. The data employed in the numerical-classification procedure were routine soil survey data and this classification was compared with the Canadian Soil Classification System. Three types of soil-profile data sets were used: average surface slice, selected average profile, and average profile. Methods of statistical analysis were cluster analysis and hierarchial grouping analysis. No marked differences in grouping resulted by the two methods of analyses. The average profile method seemed to give better correspondence with the Canadian System of Soil Classification. Consideration of surface layers alone did not correspond with the Canadian Soil Classification. The hierarchical grouping scheme resulted in better defined groups than the cluster analysis approach.

Pesticide Multiresidues in Waters of the Lower Fraser Valley, British Columbia, Canada. Part I. Surface Water

2009 ◽  
Vol 38 (3) ◽  
pp. 940-947 ◽  
Author(s):  
Million B. Woudneh ◽  
Ziqing Ou ◽  
Mark Sekela ◽  
Taina Tuominen ◽  
Melissa Gledhill
Keyword(s):  
British Columbia ◽  
Surface Water ◽  
Lower Fraser Valley ◽  
Fraser Valley
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