scholarly journals Improving Detection Tools for Emerald Ash Borer (Coleoptera: Buprestidae): Comparison of Multifunnel Traps, Prism Traps, and Lure Types at Varying Population Densities

2014 ◽  
Vol 107 (4) ◽  
pp. 1496-1501 ◽  
Author(s):  
Damon J. Crook ◽  
Joseph A. Francese ◽  
Michael L. Rietz ◽  
David R. Lance ◽  
Helen M. Hull-Sanders ◽  
...  
Keyword(s):  
Emerald Ash Borer ◽  
Population Densities ◽  
Varying Population

scholarly journals Improving Detection Tools for the Emerald Ash Borer (Coleoptera: Buprestidae): Comparison of Prism and Multifunnel Traps at Varying Population Densities

2013 ◽  
Vol 106 (6) ◽  
pp. 2407-2414 ◽  
Author(s):  
Joseph A. Francese ◽  
Michael L. Rietz ◽  
Damon J. Crook ◽  
Ivich Fraser ◽  
David R. Lance ◽  
...  
Keyword(s):  
Emerald Ash Borer ◽  
Population Densities ◽  
Varying Population

scholarly journals Broiler Production Under Varying Population Densities

1992 ◽  
Vol 71 (3) ◽  
pp. 427-433 ◽  
Author(s):  
T.L. CRAVENER ◽  
W.B. ROUSH ◽  
M.M. MASHALY
Keyword(s):  
Population Densities ◽  
Broiler Production ◽  
Varying Population

scholarly journals COVID-19 higher induced mortality in Chinese regions with lower air quality

2020 ◽  
Author(s):  
Riccardo Pansini ◽  
Davide Fornacca
Keyword(s):  
Climate Change ◽  
Air Quality ◽  
Viral Infections ◽  
The United States ◽  
Global Level ◽  
Population Densities ◽  
Geographical Expansion ◽  
New Form ◽  
Detrimental Impact ◽  
Varying Population

AbstractCOVID-19 has spread in all continents in a span of just over three months, escalating into a pandemic that poses several humanitarian as well as scientific challenges. We here investigated the geographical expansion of the infection and correlate it with the annual indexes of air quality observed from the Sentinel-5 satellite orbiting around China, Italy and the U.S.A. Controlling for population size, we find more viral infections in those areas afflicted by Carbon Monoxide (CO) and Nitrogen Dioxide (NO2). Higher mortality was also correlated with poor air quality, namely with high PM2.5, CO and NO2 values. In Italy, the correspondence between poor air quality and SARS-CoV-2 appearance and induced mortality was the starkest. Similar to smoking, people living in polluted areas are more vulnerable to SARS-CoV-2 infections and induced mortality. This further suggests the detrimental impact climate change will have on the trajectory of future epidemics.SignificanceWe found a significant correlation between levels of air quality and COVID-19 spread and mortality in China, Italy and the United States. Despite the infection being still ongoing at a global level, these correlations are relatively robust not being influenced by varying population densities. Living in an area with low air quality seems to be a risk factor for becoming infected and dying from this new form of coronavirus.

A Sex Attractant for the European Fir Budworm Moth, Choristoneura murinana

1980 ◽  
Vol 35 (5-6) ◽  
pp. 390-398 ◽  
Author(s):  
Ernst Priesner ◽  
Hermann Bogenschütz ◽  
Heinrich Am
Keyword(s):  
Sex Attractant ◽  
Receptor Cell ◽  
Major Constituent ◽  
Low Doses ◽  
Population Densities ◽  
Male Antenna ◽  
Hair Sensilla ◽  
Tetradecenyl Acetate ◽  
Pheromone Glands ◽  
Varying Population

Traps baited with 100 μg (Z)-9-dodecenyl acetate and 10|ig (Z)-ll-tetradecenyl acetate are highly effective in attracting C. murinana males at varying population densities. The attractive mixture was established by electrophysiological and Field screening studies combined with chemical analysis of the female pheromone secretion. (Z)-9-dodecenyl acetate is a major constituent in washes of pheromone glands of calling C. murinana females. This compound, the first dodecenyl ester pheromone known for a species of the Archipini tribe, is moderately attractive on its own at low doses. Attraction is strongly synergized by 10% (Z)-11-tetradecenyl acetate but is inhibited by small amounts of (Z)-9- tetradecenyl acetate. Each of the three compounds acts upon a separate type of receptor cell in hair sensilla of the male antenna.

Delayed Maturity and Reproductive Gaps in Fluctuating Populations

1997 ◽  
Vol 05 (02) ◽  
pp. 191-201 ◽  
Author(s):  
Veijo Kaitala
Keyword(s):  
Population Density ◽  
Evolutionary Stability ◽  
Breeding Strategies ◽  
Population Densities ◽  
Structured Population ◽  
Population Breeding ◽  
Age Structured ◽  
Fluctuating Populations ◽  
Varying Population ◽  
Age Structured Population

The evolutionary stability of delayed maturity and suppressed breeding, including a possibility of reproductive gaps, in an age-structured population breeding more than once within a breeding season was studied. In this study I show that breeding strategies may depend strongly on intra-specific competition (population density), in which case the breeding strategies will also modify the overall growth rates of the population. Consequently, breeding strategies may fluctuate from year to year when the individuals adjust their breeding behaviors according to chaotically varying population densities.

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