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Threshold host density (NT), in the context of wildlife disease ecology, refers to the concentration of a population of a particular organism as it relates
Threshold_host_density
Concept in population ecology
extinction threshold refers to minimum parasite density level for the parasite to persist in a population. Interventions that reduce parasite density to a level
Density_dependence
species • Poaching • Pollinator decline • Species extinction • Threshold host density • Wildlife trade • Wildlife disease Energy conservation — Alternatives
List_of_environmental_issues
outside of any living host, they are difficult to control or eradicate. Their spread is also not subject to threshold host density. Sapronotic outbreaks
Sapronosis
Invasion of an organism's body by pathogenic agents
infectious disease concepts Sentinel surveillance Spillover infection Threshold host density Transmission (medicine) Vaccine-preventable diseases Waterborne
Infection
Japanese academic
beetle densities and parameter values, finding that there is a threshold host density above which the disease can spread, and that the minimum density critically
Nanako_Shigesada
Disease affecting wild animal species
ciliate parasite known as Philaster apodigitformis Zoonosis Epizootic Threshold host density Wildlife management List of zoonotic diseases "Epidemiological Triad"
Wildlife_disease
Sub-discipline of ecology
decision-making. Epidemiology Immunology Microbiology Natural reservoir Threshold host density Zoonotic diseases Ecoimmunology Ostfeld (2015). Hawley & Altizer
Disease_ecology
Point at which a population cannot survive
Extinction Threshold: A Synthesis, Ecological Applications: Vol.12, No.2, pp.346-353. Deredec, A. and Courchamp, F, 2003:Extinction Thresholds in Host-Parasite
Extinction_threshold
Biological ability to detect and respond to cell population density
cell density, the molecules may just diffuse away. At high cell density, the local concentration of signaling molecules may exceed its threshold level
Quorum_sensing
Third planet from the Sun
habitats, and the nitrogen cycle are thought to have passed the safe threshold. As of 2018, no country meets the basic needs of its population without
Earth
Applied electric field conductivity change
arrested at this point, as the electron density increases exponentially with band-bending beyond the threshold voltage, effectively pinning the depletion
Field_effect_(semiconductor)
States of matter for water as a solid
suppressing long-range density fluctuations and are, therefore, nearly hyperuniform. Classification analysis suggests that low and high density amorphous ices
Phases_of_ice
Genus of roundworms that live on potato roots
60% at high population densities. The eggs hatch in the presence of Solanoeclepine A, a substance secreted by the roots of host plants otherwise known
Potato_cyst_nematode
Rapid spread of disease affecting a large number of people in a short time
including a change in the ecology of the host population (e.g., increased stress or increase in the density of a vector species), a genetic change in
Epidemic
Crime analysis software
CrimeView's Threshold Alert function is currently being used by Lincoln Police Department as a daily reporting mechanism. The Threshold Alert routine
CrimeView
Type of neutron star with a strong magnetic field
by the collapse of a star with a mass 10–25 times that of the Sun. The density of a magnetar's interior is such that a tablespoon of its material would
Magnetar
Massive rocky exoplanet
period planet (USP) and is confirmed to be terrestrial in nature. Its high density implies a massive iron core taking up between 30% and 50% of the planet's
K2-141b
Species of insect
phenological synchrony with their host plants, and reduced predation enemies. Whatever the cause, outbreak densities give rise to cyclic population dynamics
Forest_tent_caterpillar_moth
Beneficial symbiosis between species
from the host species, which is substantially unaffected. The commensal relation is often between a larger host and a smaller commensal; the host organism
Commensalism
Arrangement of spheres within a space
Project Hosting". Google Code Archive. "Wolfram Math World, Sphere packing". Torquato, S.; Stillinger, F. H. (2007). "Toward the jamming threshold of sphere
Sphere_packing
Most populous city in Canada
hot summer humid continental climate (Köppen: Dfa), though was on the threshold of a warm summer humid continental climate (Dfb) until the 20th century
Toronto
Extrasolar planet orbiting TOI-2431
the host star and be torn apart. TOI-2431 b has around 1.54 times Earth's radius (R🜨) and 6.2 times Earth's mass (M🜨), resulting in a density of 9
TOI-2431_b
Town in Bodø Municipality, Norway
(Köppen: Dfb) using 0C as the winter threshold or a temperate oceanic climate if using -3C as the winter threshold as in the original Köppen climate classification
Bodø_(town)
Signaling molecule enabling detection and response to cell-population density
luminescent enzyme (luciferase) only when cultures had reached a threshold population density. At low cell concentrations, V. fischeri did not express the
Autoinducer
Ecology term
Alternatively, if there is a high density of flying foxes feeding at one time (abundance above the threshold density) then aggressive behavior, such as
Ecological_extinction
Largest city in Texas, United States
consisted of a collection of mid-rise office structures. Downtown was on the threshold of an energy industry–led boom in 1970. A succession of skyscrapers was
Houston
Capital and largest city of Latvia
blocks elected to the City Council. The electoral list that surpass the 5% threshold then form according factions in the council. From February to October
Riga
Equations modelling predator–prey cycles
is the population density of prey (for example, the number of rabbits per square kilometre); the variable y is the population density of some predator
Lotka–Volterra_equations
Governor of California since 2019
law that authorizes the California Energy Commission to set "a profit threshold above which companies would be assessed a financial penalty", requires
Gavin_Newsom
Small planetary-mass object
which allows their masses and thus an estimate of their densities to be determined. Mass and density in turn can be fit into geophysical models in an attempt
Dwarf_planet
Type of data visualization for geographic regions
geographic characteristic within spatial enumeration units, such as population density or per-capita income. Choropleth maps provide an easy way to visualize
Choropleth_map
Dense collection of trees covering a relatively large area
forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United
Forest
CAPMAS. Retrieved 10 January 2024. "Egypt birth rate falls below 2 mln threshold for 1st time since 2007 - Society - Egypt". Ahram Online. "الجهاز المركزي
Demographics_of_Egypt
Country in West Asia
location, and its role as the world's focal point of Shia Islam. Iran is a threshold state with one of the most scrutinized nuclear programs. It is a founding
Iran
American politician (born 1970)
million, or $7 million for a married couple, until the federal estate tax threshold is reached. The bill failed to move out of committee. In 2025, Wiener
Scott_Wiener
experimental verification of a theorised density-free plasma operating regime, achieving stable electron densities approximately 1.3–1.65 times the Greenwald
2026_in_science
2026 South Korean television series
This marked the first time a miniseries surpassed the 15% viewership threshold within two episodes since the third season of The Penthouse: War in Life
Agent_Kim_Reactivated
Surface used for takeoff or landing
The runway is the surface from threshold to threshold (including displaced thresholds), which typically features threshold markings, numbers, and centerlines
Runway
1983 aviation accident in Canada
used the density figure for jet fuel from the Air Canada refueler's slip. This figure, used for all other aircraft in the fleet, stated the density in pounds/litre
Gimli_Glider
Sub-Neptune orbiting the red dwarf K2-18
its star; it may be close to, but fall short of, the runaway greenhouse threshold—and its temperature in the absence of a greenhouse is about 250 K (−23 °C;
K2-18b
Single layer of endothelial cells on the surface of the cornea
endothelial cell density to fall below the threshold level needed to maintain corneal deturgescence. This threshold of endothelial cell density varies considerably
Corneal_endothelium
Measure of a substance's ability to resist or conduct electric current
the electric field at the point x, J(x) is the current density at the point x. The current density is parallel to the electric field by necessity. Conductivity
Electrical resistivity and conductivity
Electrical_resistivity_and_conductivity
Species of bee
analyses of population densities of both host bees and B. bohemicus, there appears to be a threshold host population density at which the parasites are
Bombus_bohemicus
Pregnancy at older ages
the effects of increasing age occurring as a continuum rather than as a threshold effect. Average age at first childbirth has been increasing, especially
Advanced_maternal_age
Electricity generation by nuclear fusion
18, 2021). "National Ignition Facility experiment puts researchers at threshold of fusion ignition". Lawrence Livermore National Laboratory. Conca, James
Fusion_power
Long, narrow inlet with steep sides or cliffs, created by glacial activity
valley or trough end. Such valleys are fjords when flooded by the ocean. Thresholds above sea level create freshwater lakes. Glacial melting is accompanied
Fjord
Type of machine learning model
"large language model" is inherently vague, as there is no definitive threshold for the number of parameters required to qualify as "large". Before being
Large_language_model
US Nuclear bomb
Alexander Grushko, who accused the US government of "reducing the nuclear threshold" with the weapon's increased accuracy. The F/A-18E/F Super Hornet is not
B61_nuclear_bomb
Compact region at a galaxy's center with abnormally high luminosity
the accretion of matter by a supermassive black hole at the center of its host galaxy. The super massive black hole at the center of the Milky Way galaxy
Active_galactic_nucleus
Species of beetle
level of damage they inflict as active feeding ceases below a certain threshold of oxygen Animal agents of biological control include the parasitoid wasps
Callosobruchus_maculatus
Symbiotism between certain parasitic plants and fungi
carbon stable isotope abundances support the myco-heterotrophic nature and host-specificity of certain achlorophyllous plants" (PDF). New Phytologist. 160
Myco-heterotrophy
2009 American science fiction action adventure film
Fickman was a fan of Gugino's role in the short-lived television series Threshold. Ciarán Hinds as Henry Burke, the leader of Project Moon Dust. Sarcastic
Race_to_Witch_Mountain
S-shaped curve
Factors including a lack of susceptible hosts (through the continued spread of infection until it passes the threshold for herd immunity) or reduction in the
Logistic_function
Country in West Asia
proportional representation of political parties, with a 3.25% electoral threshold, which in practice has resulted in coalition governments. Residents of
Israel
Dietary interactions between species
biological species interactions including prey-predator (see predation), host-parasite (see parasitism), plant-herbivore and victim-exploiter systems.
Consumer–resource interactions
Consumer–resource_interactions
Oceanographic Phenomenon
vertical density gradients in conservative temperature and absolute salinity. To do so, the threshold gradient method is used with a threshold of ∂ σ 1
Thermohaline_staircase
Lithography using 13.5 nm UV light
photon numbers, some areas designated to print actually fail to reach the threshold to print, leaving unexposed defect regions. Some areas may be overexposed
EUV_lithography
Calcareous marine nodules composed of crustose red algae
significant microbial shifts. These findings reinforce the existence of a close host-microbe functional entity, where the metabolic crosstalk within the rhodolith
Rhodolith
SpaceX satellite Internet constellation
chance of colliding with a European one, ten times higher than the ESA's threshold for avoidance maneuvers. SpaceX subsequently fixed an issue with its paging
Starlink
U.S. state
Carnegie Foundation". Retrieved October 7, 2025. "Automatic Admissions Threshold Remains at 6% for UT Austin". UT News. September 21, 2021. Retrieved May
Texas
Hypothetical invisible cosmic material
total mass–energy content. While the density of dark matter is significant in the halo around a galaxy, its local density in the Solar System is much less
Dark_matter
Earth-sized exoplanet orbiting a mid-M dwarf
false positive rate of only 0.0135, significantly below the confirmation threshold of 0.015. During the period between the initial detection of the candidate
TOI-4616_b
Locations where civilization emerged
Oklahoma Press, 1994. Ofer Bar-Yosef. "The Natufian Culture in the Levant, Threshold to the Origins of Agriculture" (PDF). www.columbia.edu. Archived (PDF)
Cradle_of_civilization
Scientific projections regarding the far future
Bochow, N; Poltronieri, A; Robinson, A (2023). "Overshooting the critical threshold for the Greenland ice sheet". Nature. 622 (7983): 528–536. Bibcode:2023Natur
Timeline_of_the_far_future
Protein with oligosaccharide modifications
Nina (10 October 2017). "Variant surface glycoprotein density defines an immune evasion threshold for African trypanosomes undergoing antigenic variation"
Glycoprotein
Study of organisms and their environment
that natural selection varies with population density. For example, when an island is first colonized, density of individuals is low. The initial increase
Ecology
Terrestrial exoplanet orbiting Kepler-186
that Kepler-186f (like Kepler-452b) may still fall below the statistical threshold for confirmation, and so should still be considered a planet candidate
Kepler-186f
1849–1850 novel by Charles Dickens
aloud. Many other scenes employ the same method: Micawber crossing the threshold, Heep harassing David in Chapter 17, the chilling apparition of Littimer
David_Copperfield
Species of roundworm
are the damage threshold for slow decline disease in Israel. In Cyprus, the growers need to apply nematicides when the nematode densities reach 5000 juveniles
Tylenchulus_semipenetrans
Capital and largest city of Qatar
was host to the first ministerial-level meeting of the Doha Development Round of World Trade Organization negotiations. It was also selected as host city
Doha
Virus that infects bacteria
viruses at the treatment's conclusion. Establishing a secure discharge threshold, studies have determined that discharges below 3000 PFU/100 mL are considered
Bacteriophage
Species of beetle
honeybee's alarm pheromone, which is primarily released by the host to inform the host guards about the presence of invaders. This fitness advantage improves
Small_hive_beetle
Identification (foraging behaviors), Conspecific Interactions (sexual selection), and Host Recognition. In vivo, a complex of chemical signals and pheromones are commonly
Chemosensory_speciation
Species of true bug
The current economic threshold for soybean aphids states that an insecticide application is warranted when soybean aphid densities reach 250 soybean aphids
Soybean_aphid
Electromagnetic projectile launcher
'transition' into hybrid armatures, typically after a particular velocity threshold is exceeded. The high current required to power a railgun can be provided
Railgun
Flash memory card format
in February 2017), raises the thresholds to 4,000 read and 2,000 write IOPS. However, achieving these speeds requires host device support for command queuing
SD_card
Events of California governorship since 2019
law that authorizes the California Energy Commission to set "a profit threshold above which companies would be assessed a financial penalty", requires
Governorship_of_Gavin_Newsom
Discrepancy of the lack of evidence for alien life despite its apparent likelihood
and may also be on many exoplanets. The authors argue that while the threshold of oxygen required for the existence of complex life and ecosystems is
Fermi_paradox
Concept in inferential statistics
according to specific circumstances. The significance level α is the threshold for p below which the null hypothesis is rejected even though by assumption
Statistical_significance
two closely spaced conducting plates, exploiting the Casimir effect? Threshold problem: Can we go beyond the noisy intermediate-scale quantum era? Can
List of unsolved problems in physics
List_of_unsolved_problems_in_physics
Common name for a group of insects
above a threshold tolerated by the fungus. The fungal pathogen Entomophaga grylli is able to influence the behaviour of its grasshopper host, causing
Grasshopper
Supervillain in the DC Universe
Comics (vol. 2) #5 (January 2012) Action Comics (vol. 2) #7 (March 2012) Threshold #5-6 (July–August 2013) Action Comics (vol. 2) Annual #2 (August 2013)
Brainiac
Ongoing overuse of opioid medication in the US
regarding program admission into treatment programs are considered "high-threshold." Individuals seeking treatment must meet several criteria to be eligible
Opioid epidemic in the United States
Opioid_epidemic_in_the_United_States
Electronic non-volatile computer storage device
increasing the threshold voltage (VT) of the cell. This means that the VT of the cell can be changed between the uncharged FG threshold voltage (VT1) and
Flash_memory
Species of thrip
land. Physically manipulating the host by removing preferred feeding sites has been shown to reduce thrips density on the plant, but also to increase
Scirtothrips_dorsalis
Rod-shaped, gram-negative bacterium
damage accumulation in an old E. coli lineage may surpass its immortality threshold so that it arrests division and becomes mortal. Cellular aging is a general
Escherichia_coli
Species of true bug
fecundity of A. atomus often results in no significant effect on host population density, and therefore it is considered poor for controlling E. decipiens
Empoasca_decipiens
Country in Southeastern Europe and West Asia
electoral threshold for political parties at national level is seven percent of the votes. Smaller parties can avoid the electoral threshold by forming
Turkey
trap, however, when benefits are withdrawn when passing a certain income threshold. Prevalence of the misconception varies by political party affiliation
List of common misconceptions about science, technology, and mathematics
List_of_common_misconceptions_about_science,_technology,_and_mathematics
Scattering of photons off charged particles
process called pair production; even-higher-energy photons (beyond a threshold energy of at least 1.670 MeV, depending on the nuclei involved), can eject
Compton_scattering
Method of approximating the properties of a composite material
edge (wire) density (NE), resistivity (ρ), width (w) and thickness (t) of edges (wires) as: Constitutive equation Percolation threshold Wenshan, Cai;
Effective medium approximations
Effective_medium_approximations
Evolutionary hypothesis
contrast, K-selected species display traits associated with living at densities close to carrying capacity and typically are strong competitors in such
R/K_selection_theory
Marine invertebrates of the subphylum Anthozoa
Elizabeth; Khalil, Andrew; Mumby, Peter J. (2025-09-02). "Critical thresholds of adult patch density and spacing during coral fertilization". Nature Ecology &
Coral
Capital of England and the United Kingdom
precipitation, London receives 109.6 rainy days on the 1 mm (0.039 in) threshold annually. London is vulnerable to climate change, and experts are concerned
London
Computer hardware technology that uses quantum mechanics
Summit supercomputer with optimized algorithms, sparking a debate over the threshold for this milestone. Quantum computing increasingly focused on controlling
Quantum_computing
Encoding method used on early floppy and hard disk drives
voltages. In DRAM for instance, the presence of a voltage over a certain threshold represents a binary one, while any voltage below that value represents
Frequency_modulation_encoding
Display that uses the light-modulating properties of liquid crystals
pixels below the threshold voltage as discovered by Peter J. Wild in 1972, while activated pixels are subjected to voltages above threshold (the voltages
Liquid-crystal_display
Species of bird
million individuals in Europe alone. They are not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e., declining
Hooded_crow
Class of marine invertebrates
certain events, such as a change in urchin density due to disease, shifting the balance over the threshold. The inverse is also true, and urchin barrens
Sea_urchin
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THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
THRESHOLD HOST-DENSITY
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