The green soul of the concrete jungle: the urban century, the urban psychological penalty, and the role of nature by Robert Ian McDonald, Timothy Beatley, Thomas Elmqvist

“…Here we show that 46% of humans are living at population densities where global datasets suggest that this psychological penalty may be an issue, a fraction that will only grow as urbanization continues. …”
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Body reserves and pregnancy rates of introduced red deer in Patagonia (Argentina) after a period of drought by Werner T. Flueck

“…Although the recruitment rate was drastically reduced through such food shortage, the effect might be of short duration as the drought terminates, and red deer may continue to exert intensive pressure on the flora causing subsequent damage if population densities are not lowered through continuous hunting or other control means. …”
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Influence of cucurbitacin-containing phytonematicides on selected nutrient elements in leaf tissues of green bean under greenhouse conditions by P. W. Mashela, K. M. Pofu

“…Cucurbitacin-containing phytonematicides consistently reduce nematode population densities in various crops. However, there is no information on how these products affect the accumulation of essential nutrient elements in crops. …”
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Exploratory investigation of region level risk factors of Ebola Virus Disease in West Africa by Benjamin Levy, Agricola Odoi

“…This may be due to higher population densities in the more urban centers and hence higher potential of infectious contact. …”
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Effects of different kinds of fertilizers on production of fishes in Polyculture system by M.J. Alam

“…Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. …”
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Commonly rare and rarely common: comparing population abundance of invasive and native aquatic species. by Gretchen J A Hansen, M Jake Vander Zanden, Michael J Blum, Murray K Clayton, Ernie F Hain, Jennifer Hauxwell, Marit Izzo, Matthew S Kornis, Peter B McIntyre, Alison Mikulyuk, Erika Nilsson, Julian D Olden, Monica Papeş, Sapna Sharma

“…Recognition of cross-site heterogeneity in population densities brings a new dimension to invasive species management, and may help to refine optimal prevention, containment, control, and eradication strategies.…”
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Availability and Adequacy of Facilities in 15 Minute Community Life Circle Located in Old and New Communities by Wei Wu, Prasanna Divigalpitiya

“…However, there is a lack of research on how to apply the 15 min-CLC concept in second-tier cities, which have high population densities and lower quality of life. This study chose Jinan City as a case study to explore the underdeveloped areas and facilities of 15 min-CLCs in rapidly developing and medium-size cities, called second-tier cities. …”
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THE STABILITY OF THE CRITICAL POINTS OF THE GENERALIZED GAUSE TYPE PREDATOR-PREY FISHERY MODELS WITH PROPORTIONAL HARVESTING AND TIME DELAY by Wan Natasha Wan Hussin, Rohana Embong, Che Noorlia Noor

“…This is because, when the growth of the prey population is null at the time delay period, the predator’s growth is affected by its population and prey population densities only after the time delay period. Therefore, the generalized Gause type predator-prey fishery models with a selective proportional harvesting rate of fish and time lag in the Holling type II predator response function are proposed to simulate and solve the population dynamical problem. …”

Microbial Community Composition as Affected by Dryland Cropping Systems and Tillage in a Semiarid Sandy Soil by Verónica Acosta-Martínez, Scot E. Dowd, Colin W. Bell, Robert Lascano, Jill D. Booker, Ted M. Zobeck, Dan R. Upchurch

“…Soil under Srf-Rye showed higher population densities of Bacteroidetes and Proteobacteria while lower Actinobacteria compared to Srg-Ct and Ct-Rye-Srg. …”
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Spatial weed distribution models under climate change: a short review by Javier López-Tirado, Jose L. Gonzalez-Andújar

“…The current knowledge on this topic can be considered to be good not enough, especially in developing countries with high population densities. The more knowledge we can obtain, the better our understanding is of how to deal with this issue, which is a worldwide preoccupation.…”
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Role of effective microorganisms in efficacy of Nemarioc-AG phytonematicide on suppression of Meloidogyne incognita and growth of tomato plants by P. W. Mashela

“…Regression of nematode population densities, root gall and dry shoot mass over increasing phytonematicide concentration exhibited quadratic relations, which were explained by 93%, 97% and 99%, respectively. …”
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The declines of heterogeneity and stability in diatom communities are associated with human activity by Rong Wang, Wenxiu Zheng, Min Xu, Hui Yang

“…The results showed that the diatoms richness in the Qinghai‐Xizang and the Yunnan‐Sichuan region was lower and the network distance was higher than that of the Lower Yangtze River Basin. β‐diversity in the Lower Yangtze River Basin was the lowest and the diatom network distance responds negatively to human population densities in China. The simulation showed that the network distance kept constant during random species loss, and declined while specialist species were lost or replaced by generalist species. …”
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The extremely high diversity of Collembola in relict forests of Primorskii Krai of Russia by Nataliya Kuznetsova, Anna Bokova, Alexander Kuprin, Mikhail Potapov, Yulia Shveenkova, Natalya Ivanova

“…A multi-scale sampling design allowed us to estimate population densities and local species richness of Collembola at areas of different sizes. …”
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Is restocking a useful tool for increasing rabbit densities? by Francisco Carro, Mónica Ortega, Ramón C. Soriguer

“…At the same time, corrective measures including population restocking in areas with low population densities using rabbits from other geographical areas have been performed. …”
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Assessment of Environmental Impacts on Health: Examples from the Pacific Basin by Paul Jagals, Injeong Kim, Claire Brereton, Colleen L. Lau

“…Assessing environmental impacts on health in the Pacific Basin is challenged by significantly varying data types – quantities, qualities, and paucities – because of varying geographic sizes, environments, biodiversity, ecological assets, and human population densities, with highly varied and unequal socio-economic development and capacity to respond to environmental and health challenges. …”
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It's all about food: Environmental factors cause species‐specific dispersal by Bianca Kreuzinger‐Janik, Birgit Gansfort, Walter Traunspurger, Christoph Ptatscheck

“…We hypothesized that emigration is generally positively correlated with the intrinsic rate of natural increase and would decrease with increasing food availability and increase both with the presence of a predator and at higher initial population densities. These predictions were tested both using single‐species tests with laboratory cultures and using intact natural nematode communities to investigate whether environmental factors determine the composition of dispersing species. …”
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A census of mammal populations in Punta Leona Private Wildlife Refuge, Costa Rica by Joshua Timock, Christopher Vaughan

“…The Central American spider monkey (Ateles geoffroyi), tamandua anteater (Tamandua mexicana), and variegated squirrel (Sciurus variegatoides) were also included in the census. Population densities are calculated, habitat types are describes, and habitat use and activity periods are discussed.…”
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Population dynamics and gene transfer in genetically modified bacteria in a model microcosm. by Lilley, A, Bailey, M, Barr, M, Kilshaw, K, Timms-Wilson, T, Day, M, Norris, S, Jones, T, Godfray, H

“…Surprisingly, bacteria in the chromosome insertion treatment (I) consistently achieved higher population densities than the unmanipulated control and other treatments. …”

Escape from parasitism by the invasive alien ladybird, Harmonia axyridis by Comont, R, Purse, B, Phillips, W, Kunin, W, Hanson, M, Lewis, O, Harrington, R, Shortall, C, Rondoni, G, Roy, H

“…Alien species are often reported to perform better than functionally similar species native to the invaded range, resulting in high population densities, and a tendency to become invasive. …”

Experimental characterization of a small scale arc-jet flow using a spatially resolved UV-nIR Spectroscopy System by Buquet, M, Chang, E, Williams, B, Hermann, T

“…After calibration, the spectra were band-fitted to a range of radiative emission simulations of different temperature profiles and species population densities, assuming a chemical equilibrium composition. …”