bottleneck

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A marked decrease in gene pool diversity due to a low number of genetically distinct individuals in the population, i.e., a population bred from 2 individuals has far fewer variables on the allelic loci—a bottleneck—than a second population bred from hundreds of individuals

bottleneck

a period in the history of a population during which the number of individuals is reduced to a low number, perhaps by disease or extreme environmental conditions. As a result RANDOM GENETIC DRIFT may occur in the population. See also FOUNDER EFFECT.
References in periodicals archive ?
* 7,92mm naboj vzor 23--the vzor 98-22 was chambered for the 7,92mm nabojue vzor23, which was identical to the German 7.9mm Patrone S (7.9x57 Mauser) with a rimless, bottlenecked case 57mm long topped with a 154-grain FMJ, spitzer bullet traveling at 2930 fps.
The generalized genetic distances of the bottlenecked lines from the ancestor are shown in Figure 1 (and Appendix II), separated for size (major axis) and shape (summarized across axes II, III, and IV) components over the course of the five serial bottlenecks, and the randomized blocks ANOVA is given in Table 1.
bottlenecked case measuring 58mm containing a 77-grain charge of blackpowder and a 370-grain lead bullet.
The average selectional responses (presented as deviations from the initial population) are given in figure 1 for the nonbottlenecked lines and figure 2 for the bottlenecked lines.
* Metak turski (Turkish cartridge) 7,65mm 1890 & 1903--the Turkish rifles used the 7.65x53 Mauser cartridge with a bottlenecked, rimless case whose 211-grain, round nosed, full metal-jacketed (FMJ) bullet attained a muzzle velocity of 2130 fps.
8mm balle 1898 D--used a rimmed, bottlenecked case 51mm long whose 198-grain solid brass, boattail, spitzer bullet achieved a velocity of 2380 fps.
* 7.9min Patrone 88--the ex-German Infanteriegewehr 88's cartridge used a rimless, bottlenecked case 57mm in length whose 227-grain round-nosed FMJ bullet had a velocity of 2035 fps.
* Cartucho coin bala de 7,7mm m/17--the .303 Mark VII adopted by the British in 1910, its 56mm, rimmed, bottlenecked case was loaded with a 174-grain fiat-based, spitzer bullet and 37 grains of Cordite to produce a muzzle velocity of 2440 fps.
* 7mm Type 47--these Mausers were chambered for the 7x57 cartridge with a rimless, bottlenecked case 57mm in length, whose 139-grain FMJ, spitzer bullet had a muzzle velocity of 2780 fps.
This consisted of a rimmed, bottlenecked case, 60mm long with a paper-patched.
90--used the same 47mm rimmed, bottlenecked case as the 10.35mm Mo.
* 7.65x53 Mauser--Turkish Mausers used cartridges with a bottlenecked, rimless case whose 211 -grain, roundnosed, full metal-jacketed (FMJ) bullet attained a muzzle.