The Experts below are selected from a list of 15618 Experts worldwide ranked by ideXlab platform
Francois Morneau - One of the best experts on this subject based on the ideXlab platform.
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reproduction of american robin turdus migratorius in a Suburban Environment
Landscape and Urban Planning, 1995Co-Authors: Francois Morneau, Claire Lepine, Robert Decarie, Marcandre Villard, Jeanluc DesgrangesAbstract:We compared the breeding biology of the American robin in a Suburban population and in populations from less urbanized Environments using data from 141 nests from a dense suburb near Montreal, Que., and data from the literature. Our data suggest that robins potentially can have a large clutch size and very high rates of reproductive success in Suburban areas and that the breeding season seems to be longer in suburbs than in more rural settings. In our study area, robins rarely used artificial nesting substrate.
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impact of insecticides on the american robin turdus migratorius in a Suburban Environment
Environmental Pollution, 1993Co-Authors: Robert Decarie, Claire Lepine, Jeanluc Desgranges, Francois MorneauAbstract:The purpose of this study was to examine the effects of diazinon and acephate applications to ornamental trees on the breeding behaviour and productivity of the American robin and to measure the effect of repeated chlorpyrifos spraying on robin productivity. No cases of adult or juvenile mortality were recorded, and nestling production was not affected. Plasma cholinesterase (ChE) activity in females exposed to diazinon or acephate was significantly lower than that in controls. However, there were no pronounced changes in parental care. The absence of a significant impact on behaviour despite the marked change in plasma ChE levels may have been due to one of several factors, i.e. (1) the insecticide had not reached the brain 18 to 24 h after spraying, and (2) exposure was insufficient to produce behavioural changes. The use of diazinon and acephate on ornamental trees should not be harmful to robins. There was a negative correlation between nest productivity and the number of lawns surrounding the nest treated with chlorpyrifos once or more in the preceding 2 years. The decline in earthworm numbers and their reduced biomass due to repeated chlorpyrifos use may account for the lower productivity recorded during the nesting season.
Jeanluc Desgranges - One of the best experts on this subject based on the ideXlab platform.
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reproduction of american robin turdus migratorius in a Suburban Environment
Landscape and Urban Planning, 1995Co-Authors: Francois Morneau, Claire Lepine, Robert Decarie, Marcandre Villard, Jeanluc DesgrangesAbstract:We compared the breeding biology of the American robin in a Suburban population and in populations from less urbanized Environments using data from 141 nests from a dense suburb near Montreal, Que., and data from the literature. Our data suggest that robins potentially can have a large clutch size and very high rates of reproductive success in Suburban areas and that the breeding season seems to be longer in suburbs than in more rural settings. In our study area, robins rarely used artificial nesting substrate.
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impact of insecticides on the american robin turdus migratorius in a Suburban Environment
Environmental Pollution, 1993Co-Authors: Robert Decarie, Claire Lepine, Jeanluc Desgranges, Francois MorneauAbstract:The purpose of this study was to examine the effects of diazinon and acephate applications to ornamental trees on the breeding behaviour and productivity of the American robin and to measure the effect of repeated chlorpyrifos spraying on robin productivity. No cases of adult or juvenile mortality were recorded, and nestling production was not affected. Plasma cholinesterase (ChE) activity in females exposed to diazinon or acephate was significantly lower than that in controls. However, there were no pronounced changes in parental care. The absence of a significant impact on behaviour despite the marked change in plasma ChE levels may have been due to one of several factors, i.e. (1) the insecticide had not reached the brain 18 to 24 h after spraying, and (2) exposure was insufficient to produce behavioural changes. The use of diazinon and acephate on ornamental trees should not be harmful to robins. There was a negative correlation between nest productivity and the number of lawns surrounding the nest treated with chlorpyrifos once or more in the preceding 2 years. The decline in earthworm numbers and their reduced biomass due to repeated chlorpyrifos use may account for the lower productivity recorded during the nesting season.
Robert Decarie - One of the best experts on this subject based on the ideXlab platform.
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reproduction of american robin turdus migratorius in a Suburban Environment
Landscape and Urban Planning, 1995Co-Authors: Francois Morneau, Claire Lepine, Robert Decarie, Marcandre Villard, Jeanluc DesgrangesAbstract:We compared the breeding biology of the American robin in a Suburban population and in populations from less urbanized Environments using data from 141 nests from a dense suburb near Montreal, Que., and data from the literature. Our data suggest that robins potentially can have a large clutch size and very high rates of reproductive success in Suburban areas and that the breeding season seems to be longer in suburbs than in more rural settings. In our study area, robins rarely used artificial nesting substrate.
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impact of insecticides on the american robin turdus migratorius in a Suburban Environment
Environmental Pollution, 1993Co-Authors: Robert Decarie, Claire Lepine, Jeanluc Desgranges, Francois MorneauAbstract:The purpose of this study was to examine the effects of diazinon and acephate applications to ornamental trees on the breeding behaviour and productivity of the American robin and to measure the effect of repeated chlorpyrifos spraying on robin productivity. No cases of adult or juvenile mortality were recorded, and nestling production was not affected. Plasma cholinesterase (ChE) activity in females exposed to diazinon or acephate was significantly lower than that in controls. However, there were no pronounced changes in parental care. The absence of a significant impact on behaviour despite the marked change in plasma ChE levels may have been due to one of several factors, i.e. (1) the insecticide had not reached the brain 18 to 24 h after spraying, and (2) exposure was insufficient to produce behavioural changes. The use of diazinon and acephate on ornamental trees should not be harmful to robins. There was a negative correlation between nest productivity and the number of lawns surrounding the nest treated with chlorpyrifos once or more in the preceding 2 years. The decline in earthworm numbers and their reduced biomass due to repeated chlorpyrifos use may account for the lower productivity recorded during the nesting season.
Claire Lepine - One of the best experts on this subject based on the ideXlab platform.
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reproduction of american robin turdus migratorius in a Suburban Environment
Landscape and Urban Planning, 1995Co-Authors: Francois Morneau, Claire Lepine, Robert Decarie, Marcandre Villard, Jeanluc DesgrangesAbstract:We compared the breeding biology of the American robin in a Suburban population and in populations from less urbanized Environments using data from 141 nests from a dense suburb near Montreal, Que., and data from the literature. Our data suggest that robins potentially can have a large clutch size and very high rates of reproductive success in Suburban areas and that the breeding season seems to be longer in suburbs than in more rural settings. In our study area, robins rarely used artificial nesting substrate.
-
impact of insecticides on the american robin turdus migratorius in a Suburban Environment
Environmental Pollution, 1993Co-Authors: Robert Decarie, Claire Lepine, Jeanluc Desgranges, Francois MorneauAbstract:The purpose of this study was to examine the effects of diazinon and acephate applications to ornamental trees on the breeding behaviour and productivity of the American robin and to measure the effect of repeated chlorpyrifos spraying on robin productivity. No cases of adult or juvenile mortality were recorded, and nestling production was not affected. Plasma cholinesterase (ChE) activity in females exposed to diazinon or acephate was significantly lower than that in controls. However, there were no pronounced changes in parental care. The absence of a significant impact on behaviour despite the marked change in plasma ChE levels may have been due to one of several factors, i.e. (1) the insecticide had not reached the brain 18 to 24 h after spraying, and (2) exposure was insufficient to produce behavioural changes. The use of diazinon and acephate on ornamental trees should not be harmful to robins. There was a negative correlation between nest productivity and the number of lawns surrounding the nest treated with chlorpyrifos once or more in the preceding 2 years. The decline in earthworm numbers and their reduced biomass due to repeated chlorpyrifos use may account for the lower productivity recorded during the nesting season.
Claude Oestges - One of the best experts on this subject based on the ideXlab platform.
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centimeter and millimeter wave channel modeling using ray tracing for 5g communications
Vehicular Technology Conference, 2015Co-Authors: Claude Oestges, Gauthier Hennaux, Quentin GueuningAbstract:A ray-tracing tool, including specular reflection, diffraction and attenuation by foliage, is experimentally validated at 12 and 30 GHz in a Suburban Environment. The tool is then applied to double directional channel modeling at 30 GHz in a real-world urban area in downtown Brussels. Azimuth-, elevation- and delay-spread are computed and analyzed on a stochastic viewpoint. It is found that elevation spreads remain limited (below 3 degrees), while azimuth-spreads are on average similar at both sides of the link (with a mean value of 12 degrees). Delay-spreads vary significantly over the user's locations, with a mean value of 45 nanoseconds. They are positively correlated with the directional spreads at the base station. Finally, an investigation about the impact of microscopic surface roughness is conducted: it is found that it is mostly negligible at millimeter waves, unless extremely narrow beamwidth antennas are used.
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correlation for multi frequency propagation in urban Environment
Progress in Electromagnetics Research Letters, 2012Co-Authors: Benjamin Van Laethem, Claude Oestges, Francois Quitin, Francois Bellens, Philippe De DonckerAbstract:The multi-frequency propagation in urban Environment is investigated in this letter. An experimental measurement campaign is conducted to simultaneously measure the GSM-900, GSM-1800 and UMTS band of a cellular system in a Suburban Environment. The shadowing and small-scale fading parameters are extracted, and the correlation of these parameters across the different frequency bands is measured. It is shown that shadowing coeffcients are highly correlated, while small-scale fading is completely uncorrelated between different frequency bands.
