Effects on Wild Young Salmon of Spraying DDT over New Brunswick Forests

1967 ◽  
Vol 24 (4) ◽  
pp. 731-767 ◽  
Author(s):  
P. F. Elson
Keyword(s):  
New Brunswick ◽  
Early Mortality ◽  
Young Fish ◽  
Single Application ◽  
Quantitative Measurements ◽  
Other Information ◽  
Size Groups ◽  
Parent Stock ◽  
Winter Cold ◽  
Harmful Effects

When DDT-in-oil was sprayed over large tracts of New Brunswick forest some of the spray got into drainage systems lying in the spray zones. As a result, many young salmon were killed and stocks were endangered.Most New Brunswick salmon spend 3 years in rivers before migrating to sea as smolts. The young fish can conveniently be divided into three size-groups, which are roughly comparable to each year of age. The groups are: underyearlings, small parr (over 1 year old but 10 cm and under from tip of snout to tip of extended tail fin), and large parr.Wild young salmon in unsprayed and sprayed streams were assessed for numbers in each size-group, abundance being expressed as population index = average number per 100 yards2 of stream bottom.DDT at[Formula: see text]. After such spraying young salmon of all size-groups were found in noticeably low numbers as compared with unsprayed situations. Underyearlings were only 2–10% as abundant (index reduced from 24 in places not affected by spray to less than 1 in most sprayed places), small parr only 30% (index reduced from 20 to 6), and large parr only 50% (index reduced from 12 to 6) as abundant.DDT at[Formula: see text]. After spraying at this dosage underyearlings were only about 50% as abundant as with no spraying; small parr were about 80% as abundant and large parr were affected hardly at all.DDT at[Formula: see text]applied twice. This was followed by low numbers of underyearlings, similar to those observed with a single application at [Formula: see text]. No equivalent data for parr are available but other information indicates effects similar to a single spraying with [Formula: see text].Downstream transport of the DDT-in-oil mixture was an important factor in extending the, harmful effects 30 or more miles below spray zones.Delayed mortality followed 4 to 6 months after the early mortality described above. It was associated with the onset of winter cold. It may have removed a large proportion of parr which survived early mortality but quantitative measurements of this factor were not made on wild populations.Reductions in numbers of young salmon were followed by declines in numbers of adults taken in fisheries and returning as spawners.With no spraying in subsequent years, promptness of recovery of young salmon populations depended primarily on abundance of parent stock.

Fish Losses After Forest Sprayings with Insecticides in New Brunswick, 1952–62, as Shown by Caged Specimens and other Observations

1967 ◽  
Vol 24 (4) ◽  
pp. 709-729 ◽  
Author(s):  
C. J. Kerswill ◽  
H. E. Edwards
Keyword(s):  
Atlantic Salmon ◽  
New Brunswick ◽  
Brook Trout ◽  
Lower Boundary ◽  
Single Application ◽  
Short Term ◽  
Free Living ◽  
Forested Area ◽  
Forested Areas ◽  
Harmful Effects

The survival of young Atlantic salmon and eastern brook trout, held in cages and free-living, was observed in New Brunswick streams inside and outside forested areas sprayed operationally and experimentally from aircraft with DDT and other insecticides for budworm control. DDT-in-oil in a single application at [Formula: see text] caused heavy loss of underyearling salmon and parr within 3 weeks. DDT-in-oil at [Formula: see text] had no apparent short-term effects on salmon parr, but killed many underyearlings; two applications 10 days apart were about as harmful as a single application at [Formula: see text]. DDD at [Formula: see text] and [Formula: see text], and malathion at [Formula: see text], were no more harmful to young salmon than DDT at [Formula: see text]. Replacing Stearman airplanes with larger aircraft in operational spraying and associated changes in spraying procedure sometimes caused heavy fish losses even for single applications of DDT at [Formula: see text]. Experimental spraying of phosphamidon-in-water at 1 lb/acre had no apparent harmful effects on young salmon and trout.Observations at a counting fence across the Northwest Miramichi 12 miles below the lower boundary of the forested area sprayed with DDT at [Formula: see text] in 1954 showed extensive killing of suckers and cyprinids; also, the numbers of these species moving through the fence were abnormally low for several years after spraying.Wild young salmon were found dead in streams when autumn water temperatures approached freezing after June sprayings of watersheds with DDT.

The influence of media on upbringing and behavior of children

GIS Business ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 656-666
Author(s):  
Dr. Entisar Al-Obaidi
Keyword(s):  
New Technologies ◽  
The Internet ◽  
Negative Effects ◽  
Online Newspapers ◽  
Media Messages ◽  
Other Information ◽  
Family Home ◽  
Effects Of Media ◽  
And Behavior ◽  
Harmful Effects

Media refers to the channels of communication through which we distribute news, education, movies, music, advertising messages and other information. It includes physical and online newspapers and magazines, television, radio, telephone, the Internet, fax and billboards, are a dominant force in lives of children. Although television is remaining the predominant medium for children and adolescents, the new technologies are become more popular. We have to concern about the potential harmful effects of media "messages and images"; however, the positive and negative effects of media should be recognized. Parents have to establish the plan for all media in family home. Media that are influences on children should be recognized by "schools, policymakers, product advertisers, and entertainment producers".

scholarly journals Should Women Consult Health Agencies in Matters of Birth Control and Contraception?

2020 ◽  
Vol 1 (2) ◽  
pp. 28-37
Author(s):  
Kraetschmer K
Keyword(s):  
Birth Control ◽  
Economic Perspective ◽  
Safety And Efficacy ◽  
Contraceptive Devices ◽  
Scholarly Publications ◽  
Health Agencies ◽  
The Us ◽  
Other Information ◽  
Recent Developments ◽  
Harmful Effects

Background and Aim: On the background of recent developments revealing the harmful effects of contraceptive devices which are recommended by health agencies the paper aims at analyzing publications and other information material emanating from these agencies. This analysis – guided by the bioethical principle of informed consent — focuses on flawed science, ambiguous language, and misleading data. Method and Material: The method consists of collecting and analyzing information provided by health agencies for consumers inquiring about the safety and efficacy of contraceptive products. The material comprises documents, charts, leaflets and other publications emanating from the most authoritative and most frequently consulted health agencies, in particular those active in the US and European countries. Results and Implications: As a result of the investigation women must be advised to consult only a selected number of health agencies, especially those which take into account findings of pharmacovigilance, pharmaceutical vigilance, and scholarly publications focusing on the safety of contraception. The implications from an economic perspective are the discontinuation of funding through taxpayer money for those health agencies which continue to disseminate flawed science and demonstrate incompetence in questions about the safety of contraception.

Effects on Aquatic Insects of Forest Spraying with Phosphamidon in New Brunswick

1967 ◽  
Vol 24 (4) ◽  
pp. 823-832 ◽  
Author(s):  
C. D. Grant
Keyword(s):  
New Brunswick ◽  
Aquatic Insects ◽  
No Reduction ◽  
Number Of Individuals ◽  
Harmful Effects

No harmful effects on aquatic insects were detected in two New Brunswick streams after forest spraying with phosphamidon [Formula: see text] in 1962 and 1963. Comparison of one pre-spray and two post-spray series of bottom samples showed no reduction in number of orders (and families in the case of Diptera) and no abnormal decline in the number of individuals. In numbers and variety of insects emerging daily into stream cages and of insects drifting onto vertical screens in the streams, no changes were attributable to phosphamidon.

A critical evaluation of Bernhard's EDTA regressive staining technique for RNA

1982 ◽  
Vol 54 (1) ◽  
pp. 207-240
Author(s):  
E.C. Pearson ◽  
H.G. Davies
Keyword(s):  
Critical Evaluation ◽  
Simian Virus 40 ◽  
Chelating Agent ◽  
Staining Technique ◽  
Simian Virus ◽  
Staining Procedure ◽  
Quantitative Measurements ◽  
Short Period ◽  
Other Information ◽  
Cellular Components

The EDTA regressive staining procedure to detect RNA (Bernhard's technique) is based on the proposition that after staining ultrathin sections with uranyl the stain is preferentially removed from DNA rather than RNA by the action of the chelating agent EDTA. Whilst attempting to use the EDTA regressive staining procedure to detect the presence of RNA in the large granule complexes of chicken erythrocyte nuclei, certain anomalous staining patterns were observed in the chromatin of these nuclei. Essentially, these were that the edges of condensed chromatin bodies stained positively for RNA even though this molecule is known not to be present there in significant quantities. The staining patterns suggested that chromatin was retaining its stain in a manner expected of RNA but not DNA as a consequence of EDTA-containing species failing to pass freely through the section. This hypothesis was tested by carrying out the EDTA procedure on embedded specimens of a DNA-containing virus, simian virus 40 (SV40), small enough not to be exposed at the surface of the section. In this way it has been shown that virus particles completely surrounded by resin destain so much more slowly than chromatin, which is accessible at the surface of the section, that without any other information it would be concluded that the viruses contained RNA, not DNA. This apparently anomalous result arises because the difficulties encountered by stain or EDTA molecules in passing through a plastic section were not appreciated at the time of the initial publication of the technique. The observations are discussed in the light of recent knowledge that has been gained on the kinetics of staining by measuring the electron-scattering densities of stained sections, similar measurements having been made on sections stained by Bernhard's technique. A model for the mechanism of the EDTA regressive staining technique consistent with the experimental observations is proposed and the conditions under which Bernhard's staining procedure retains its specificity are defined. Briefly, these conditions are that: (a) the sections be stained for only a short period with uranyl before treating them with EDTA even though such brief staining is undesirable for quantitative measurements of stain uptake into biological material; and (b) that sections stained in lead only be compared as controls with sections stained by Bernhard's technique so that any specificity of lead for sub-cellular components is not confused with a positive indication of the presence of RNA. Unless these conditions are fulfilled, results obtained by the use of the regressive staining technique may be highly misleading.

Effects of Forest Spraying with DDT on Aquatic Insects of Salmon Streams in New Brunswick

1967 ◽  
Vol 24 (4) ◽  
pp. 769-805 ◽  
Author(s):  
F. P. Ide
Keyword(s):  
New Brunswick ◽  
Aquatic Insects ◽  
Late Summer ◽  
Bottom Fauna ◽  
Small Populations ◽  
Single Application ◽  
Severe Reduction ◽  
Large Populations

Sampling of emerging aquatic insects by cage-traps on a 24-hr basis showed the effects on the stream fauna of spraying forests with DDT at [Formula: see text] in June. Except for a few individuals that presumably emerged from unaffected pupae and nymphs, there was an interval of several weeks after spraying when no emergence occurred. From about the middle of August, however, large populations of very small insects, mainly chironomids, emerged in the spray year. The year after spraying, as compared with the spray year, there was an increased variety including some larger species.In following years there was further recovery by increase in larger forms through reproduction from residual small populations. The caddisflies recovered more slowly than other groups. After a single application of spray the fauna had practically recovered qualitatively in 2 or 3 years in some groups but usually not for 4 years or more in caddisflies. With a further similar spray applied within 3 years a reduction occurred equal in severity to that of the original spraying.From the standpoint of feeding of the young salmon, significant facts are: (a) the severe reduction in the bottom fauna of larvae and nymphs of all sizes in the first weeks after spraying; (b) the large populations of small larvae, mainly chironomids, developing in late summer of the spray year and so available to fry; (c) increasing numbers of larger insects the year after spraying and subsequent years.

scholarly journals THE COCCIDÆ OF BRITISH NORTH AMERICA

1901 ◽  
Vol 33 (6) ◽  
pp. 179-180
Author(s):  
Geo. B. King
Keyword(s):  
British Columbia ◽  
New Species ◽  
Nova Scotia ◽  
North America ◽  
New Brunswick ◽  
Prince Edward Island ◽  
Large Majority ◽  
British North America ◽  
Other Information ◽  
Interesting Species

The following list of the Coccidæ found to inhabit Canada is complete, so far as the published records show, together with some other information derived from corresponding with Prof. Cockerell, Dr. Fletcher, and Mr. John Dearness. Much, however, has been obtained from material sent to me for identification. In reviewing the list it will be seen that Ontario has 25 species of Coccids credited to her; while Ottawa has 18; Toronto, 6; Quebec, 3; Prince Edward Island, 3; Nova Scotia, 4; New Brunswick, 2; and British Columbia, 6. One has been found in an ants' nest, 8 in greenhouses, and there have been 8 new species described from Canada. There are 46 species, 27 of which are native to North America, 14 are introduced, and 4 whose home is unknown, but which were probably introduced. The large majority of the species have been found by Dr. Fletcher, or at least have passed through his hands. Much credit, however, is due Mr. John Dearness, who has taken great interest in looking for these very injurious insects, and has sent me several very interesting species.

Quantitative Measurements on the Ion Etching of TMV

1973 ◽  
Vol 31 ◽  
pp. 336-337
Author(s):  
Irwin Bendet ◽  
Nabil Rizk
Keyword(s):  
Electron Microscope ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Ion Current ◽  
Beam Diameter ◽  
Ion Etching ◽  
Preliminary Results ◽  
Quantitative Measurements ◽  
Monitoring Devices

Preliminary results reported last year on the ion etching of tobacco mosaic virus indicated that the diameter of the virus decreased more rapidly at 10KV than at 5KV, perhaps reaching a constant value before disappearing completely.In order to follow the effects of ion etching on TMV more quantitatively we have designed and built a second apparatus (Fig. 1), which incorporates monitoring devices for measuring ion current and vacuum as well as accelerating voltage. In addition, the beam diameter has been increased to approximately 1 cm., so that ten electron microscope grids can be exposed to the beam simultaneously.

Some quantitative applications of vascular corrosion casting

1992 ◽  
Vol 50 (1) ◽  
pp. 738-739
Author(s):  
Fred E. Hossler
Keyword(s):  
Blood Vessels ◽  
Nuclear Orientation ◽  
Three Dimensional ◽  
Surrounding Tissue ◽  
Confocal Laser ◽  
Corrosion Casting ◽  
Venous Valve ◽  
Casting Technique ◽  
Low Viscosity ◽  
Quantitative Measurements

Preparation of replicas of the complex arrangement of blood vessels in various organs and tissues has been accomplished by infusing low viscosity resins into the vasculature. Subsequent removal of the surrounding tissue by maceration leaves a model of the intricate three-dimensional anatomy of the blood vessels of the tissue not obtainable by any other procedure. When applied with care, the vascular corrosion casting technique can reveal fine details of the microvasculature including endothelial nuclear orientation and distribution (Fig. 1), locations of arteriolar sphincters (Fig. 2), venous valve anatomy (Fig. 3), and vessel size, density, and branching patterns. Because casts faithfully replicate tissue vasculature, they can be used for quantitative measurements of that vasculature. The purpose of this report is to summarize and highlight some quantitative applications of vascular corrosion casting. In each example, casts were prepared by infusing Mercox, a methyl-methacrylate resin, and macerating the tissue with 20% KOH. Casts were either mounted for conventional scanning electron microscopy, or sliced for viewing with a confocal laser microscope.

Imaging of ferroelectric domain walls by electron holography

1992 ◽  
Vol 50 (1) ◽  
pp. 246-247
Author(s):  
Xiao Zhang
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Domain Walls ◽  
Ferroelectric Domain ◽  
Object Wave ◽  
Electron Holography ◽  
High Resolution Imaging ◽  
Quantitative Measurements ◽  
Resolution Imaging ◽  
Electron Microscopes

Electron holography has recently been available to modern electron microscopy labs with the development of field emission electron microscopes. The unique advantage of recording both amplitude and phase of the object wave makes electron holography a effective tool to study electron optical phase objects. The visibility of the phase shifts of the object wave makes it possible to directly image the distributions of an electric or a magnetic field at high resolution. This work presents preliminary results of first high resolution imaging of ferroelectric domain walls by electron holography in BaTiO3 and quantitative measurements of electrostatic field distribution across domain walls.

Sign in / Sign up

Export Citation Format

Share Document