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If you're talking about HUMAN populations then generally it's increased death rates, reduced fertility, net migration or a combination thereof.
Examples:
Reduced Fertility: Due to falling birth rates the National Institute of Population and Social Security Research predicts the Japanese population will shrink a third by 2060.
Increased Death Rates: The Black Death (14th century plague) is estimated to have killed 30-60 percent of Europe's population.
Net Migration: From 1851-1911 the Irish population fell from 6.5-4.4m, largely as a result of over 4 million of it's people emigrating in that time scale.
If you're talking about ANIMALS then population levels can be affected by diseases, increases in predator/competitor numbers, decreases in prey numbers, changes to climate (including harsh winters or severe droughts etc), changes to environment (including pollution and reduced habitat) and human activities such as hunting or even extermination programmes.
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What causes a population to diminish in size?
for example if there are two many cranes in a pond the fish population will go down especially if the cranes do not get eaten so you see that the top predator keeps a ecosystem in balance other things like natural events and man-kind also effect a population hope this helps because this answer is only from a 4th grader
Why did the African bushmen population diminish?
because of hunger
What is a three letter word that means diminish?
Diminish: verb:to make smaller or cause to appear smaller in size or importance.to decrease.Some three letter words for diminish: CutDieDipEbbSag
A biotic or an abiotic resource in the environment that causes population size to decrease is a?
limiting factor
If a drought causes the stream to run dry one year how will this likely impact the black bear population?
The population's size will decrease.
When a muscle fiber contracts the you bands diminish in size the h zones disappear and the a bands move closer together but do not diminish in length true or false?
True
What would happen if snakes were introduced in Ireland?
The rodent population would swiftly diminish !
What causes air pollution to increase or decrease?
The population of a place, numerous vehicles, and a great size in factories.
What are three causes of the scraamble for Africa?
natural resources great workmanship among the people of africa population/size
What are the causes of optimum population?
causes of optimum population
What is a sentence for diminish?
My excitement will diminish.
What is relative population size?
Relative population size is the size of an area's population as it compares to similar areas' populations. For example, the relative population size of a country would be what rank it had compared to the population of other countries.
