what did sparta use to control its citizens
Education in Sparta was completely different. The purpo...
Stress from overcrowding can lower birthrates, increase death rates and increase emigration. What limit factors do not typically depend on population density? Unusual wildfires such as hurricanes droughts or floods and natural disasters such as wildfires can act as density independent limiting factors.
The two factors that decrease the size of a population are mortality, which is the number of individual deaths in a population over a period of time, and emigration, which is the migration of an individual from a place.
What is the relationship between competition and population size? As populations increase in size, competition increases as well. When populations become larger and more crowded, organisms must compete with one another for food, water, space, sunlight, and or other essential finite resources.
Because competition is often more intense as population size increases (and/or resources diminish) – the effect of competition is often density-dependent, that is at higher population density competition increases. Will adversely effect survivorship and births, i.e. population size.
Population distribution across the Earth is uneven. … Physical factors that affect population density include water supply, climate, relief (shape of the land), vegetation, soils and availability of natural resources and energy. Human factors that affect population density include social, political and economic factors.
We alter carrying capacity when we manipulate resources in a natural environment. If a population exceeds carrying capacity, the ecosystem may become unsuitable for the species to survive. If the population exceeds the carrying capacity for a long period of time, resources may be completely depleted.
The major factors affecting population are birth, death and migration. Birth increases the population while death decreases the population. Migration also causes population change. Internal migration does not make any changes but international migration makes the differences in the size of population.
The classical developments of effective population size theory are based on the rate of change in gene frequency variance (genetic drift) or the rate of inbreeding.
Consider population size. On the one hand, adaptive evolution may be more rapid in large populations. First, larger populations produce more mutant individuals per generation, which helps explore more genotypes and find optimal genotypes faster than smaller populations.
In small, reproductively isolated populations, special circumstances exist that can produce rapid changes in gene frequencies totally independent of mutation and natural selection. These changes are due solely to chance factors. The smaller the population, the more susceptible it is to such random changes.
The impact of so many humans on the environment takes two major forms: consumption of resources such as land, food, water, air, fossil fuels and minerals. waste products as a result of consumption such as air and water pollutants, toxic materials and greenhouse gases.
Population growth affects many phenomena such as the age structure of a country’s population, international migration, economic inequality, and the size of a country’s work force. These factors both affect and are affected by overall economic growth.
There was a decrease in per capita food availability despite an increase in production. Poor distribution of food resulting to hunger and deaths. Shortage in medical facilities and services. Problems with power shortage and distribution.
From Wikipedia, the free encyclopedia. Population change is simply the change in the number of people in a specified area during a specific time period. Demographics (or demography) is the study of population statistics, their variation and its causes.
Increasing population growth
Factors influencing population growth
The main components of population change are births, deaths, and migration. “Natural increase” is defined as the difference between live births and deaths.
How does competition affect population? Give an example. When only a few individuals compete for resources, no problem arises. When a population increases to the point at which demand for resources exceeds the supply, the population size decreases.
Population growth rate is affected by birth rates, death rates, immigration, and emigration. If a population is given unlimited amounts of food, moisture, and oxygen, and other environmental factors, it will show exponential growth.
How do limiting factors affect the growth of populations? By determining the carrying capacity of environments for populations.
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