11. Exploring Various Factors and Sources in Relation to Environmental Contaminants in the Rideau Canal System

2017 ◽  
Author(s):  
Cynthia Lai
Keyword(s):  
Preliminary Analysis ◽  
Residential Development ◽  
Primary Sources ◽  
Anthropogenic Factors ◽  
Community Members ◽  
Canal System ◽  
System A ◽  
Geological Processes ◽  
Rideau Canal ◽  
Sources Of Contamination

The Rideau Canal has served several purposes since its establishment in 1832. Acting as a channel connecting Ottawa and Kingston, it was often used for the transport of commercial goods and lumber. Over time, its uses expanded to include recreational purposes such as: sport fishing, boating, cottaging, and tourism. This increased development and use has caused the Rideau Canal and its watersheds to become vulnerable to metal contamination. Studies within Dr. Linda Campbell’s Lab at Queen’s University have shown that cadmium (Cd), lead (Pb), chromium (Cr), zinc (Zn), mercury (Hg), arsenic (As), and copper (Cu), are in concentrations that have reached or exceeded the level of potential concern for both aquatic and human health. This study explores the potential sources as well as both natural and human factors which could be related to the influx in metal contaminants within the system. A literature review of both historical and recent documents was completed and supplemented with personal interviews with professionals and community members. Based on these investigations, the primary sources being reviewed are: atmospheric deposition, natural geological processes, and anthropogenic factors relating to residential development. While research is still ongoing preliminary analysis suggests that these are the primary sources of contamination within the area.

A Permian Hydrozoan Mound, Yukon Territory

1971 ◽  
Vol 8 (8) ◽  
pp. 973-988 ◽  
Author(s):  
G. R. Davies
Keyword(s):  
Growth Form ◽  
Yukon Territory ◽  
Source Rocks ◽  
Lower Permian ◽  
Canal System ◽  
Rock Types ◽  
System A ◽  
Upper Paleozoic ◽  
Paleozoic Rocks ◽  
Richardson Mountains

A carbonate mound built by the hydrozoan Palaeoaplysina has been found in a poorly-exposed sequence of Lower Permian rocks in the northern Richardson Mountains of the Yukon Territory. Similar hydrozoan mounds have been described from Russia and northwestern United States. The Yukon mound is 12 ft (3.7 m) thick and at least 70 ft (21 m) long. It is underlain by marine siltstones and sandstones, and probably shale. The main mound rock is composed of curved hydrozoan plates enclosed in a bioclastic wackestone matrix, and is overlain successively by tubular–foram packstone and oolitic grainstone. Palaeoaplysina is characterized by a plate-like, laterally-expanding growth form, an internal canal system, a cellular calcareous skeleton, and 'mamelons' on the upper surface of well-preserved plates; 'mamelons' are the principal criterion for placing Palaeoaplysina in the Class Hydrozoa of the coelenterates.The Yukon mound is part of a thick sequence of Lower Permian terrigenous clastic and carbonate rocks deposited on the northern shelf of the ancestral Aklavik Arch. The repetition of similar rock types in the sequence indicates cyclicity, a thesis supported by similarities between the Yukon mound sequence and the Virgilian mound cycles in New Mexico.Lower Permian hydrozoan mounds and associated facies in the Pre-urals of Russia are known oil producers. The possibility exists that hydrozoan mounds, perhaps in multiple cyclic build-ups, may occur in upper Paleozoic rocks in the subsurface of the Yukon Territory. With suitable porosity development and source rocks, these predicted subsurface mounds could become hydrocarbon reservoirs and thus targets for oil exploration.

scholarly journals V. Researches on the Foraminifera.—Fourth and concluding series

1860 ◽  
Vol 10 ◽  
pp. 506-510
Keyword(s):  
The Other ◽  
Great Care ◽  
Canal System ◽  
Calcareous Deposit ◽  
System A ◽  
Outer Whorl ◽  
Adjacent Segments ◽  
Physiological Characters

The author in this communication brings to a conclusion that series of inquiries into the structural and physiological characters of typical forms of Foraminifera, which he had been induced to work out for the sake of turning to the account of Zoological science the valuable collections made by Mr. Jukes in the Australian Seas and by Mr. Cuming in the Philippine. The first genus now treated of is Polystomella , the smaller and simpler forms of which have long been known, and of which the structure, so far as it can be elucidated by the examination of such specimens, has been already described with great care and accuracy by Professor W. C. Williamson. But in the comparatively gigantic and highly developed Polystomella of the Australian and Philippine series, a feature exists which is scarcely discernible in the humbler forms previously examined—that feature being the extraordinary development of the canal-system. A spiral canal runs along the inner margin of either surface of every whorl; from this canal a series of arches is given off, of which one passes down between every two adjacent segments, uniting it with the other spiral canal; whilst another set of straight branches passes directly towards the surface of the shell, through the thick calcareous deposit which covers in the depressed centre of the spire, and which extends as far as the last- formed spire . From the connecting arches, successive pairs of diverging branches proceed at frequent intervals; these, in the last whorl, make their way to the surface of the shell, and (when the shell is newly formed) open close on either side of the septal band; though, as the shell increases in thickness by subsequent deposit, the increased divergence of the branches separates their mouths from each other; and it very commonly happens that the two contiguous branches diverging from different arches meet and open by a single external pore half-way between the septal bands. When one whorl, however, has been surrounded by another, this radiating canal-system of the inner whorl does not usually continue itself directly into that of the outer (though such a continuation is not unfrequently seen), but the diverging canals for the most part terminate in the stolons of communication between the segments of sarcode that occupy the chambers of the outer whorl.

Predicting the impact of perturbations on salmon (Oncorhynchus spp.) communities: implications for monitoring

2004 ◽  
Vol 61 (7) ◽  
pp. 1166-1175 ◽  
Author(s):  
M R Arkoosh ◽  
L Johnson ◽  
P A Rossignol ◽  
T K Collier
Keyword(s):  
Pacific Northwest ◽  
Anthropogenic Factors ◽  
Valuable Insight ◽  
Community Members ◽  
Contaminant Exposure ◽  
Community Model ◽  
The Pacific ◽  
Chemical Contaminant ◽  
The Impact ◽  
Insight Into

Twenty-six salmon (Oncorhynchus spp.) stocks from the Pacific Northwest are listed as either threatened or endangered. A number of anthropogenic factors, likely including degradation of habitat by chemical contaminant exposure, have contributed to their decline. Techniques that can assess injury or judge the efficacy of regulatory actions on the recovery of this species are needed. We strive to understand why a population is changing by examining changes in their intrinsic birth rates, death rates, and (or) growth rates. However, salmon populations are influenced by other species in the community. To address this issue, we developed a parsimonious three-trophic-level community model consisting of prey, salmon, and parasites and examined the model's response to one anthropogenic factor (contaminant exposure) using qualitative analysis. This community model may not only provide valuable insight into salmon survival but also may broaden the approaches available to elucidate direct and indirect effects. We demonstrate analytically that some community members, possibly salmon themselves, might be ambiguous or unreliable variables to monitor. We also demonstrate that other species in the community, such as parasites, may be more sensitive than salmon in monitoring the influence of anthropogenic factors such as contaminants.

scholarly journals Effect of QMix irrigant in removal of smear layer in root canal system: a systematic review of in vitro studies

2020 ◽  
Vol 45 (3) ◽  
Author(s):  
Margaret Soo Yee Chia ◽  
Abhishek Parolia ◽  
Benjamin Syek Hur Lim ◽  
Jayakumar Jayaraman ◽  
Isabel Cristina Celerino de Moraes Porto
Keyword(s):  
Systematic Review ◽  
Root Canal ◽  
In Vitro Studies ◽  
Smear Layer ◽  
Canal System ◽  
System A ◽  
Root Canal System
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