A population is a group of individual of a single species that simulataneously occupy the same general area. Population may increase or decrease.
By taking a sample of the entire population.
Through mark-and-recapture projects, direct observations, or targeted sampling, ecologists are able to determine the population of a particular species. This process is a scientific estimation of the population.
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In many cases, it is not even possible to count signs of every member of a population. The population may be very large or spread over a wide area. In such cases ecologists usually make an estimate. An estimate is an approximation of number, based on reasonable assumptions.
Individual-->Population-->community-->ecosystem-->biome-->biosphere
Population ecologists study the size, density, and structure of populations and how they change over time. ... Ecologists working at the biosphere level may study global patterns—for example, climate or species distribution—interactions among ecosystems, and phenomena that affect the entire globe, such as climate change.
The population is Changing
Ecologists Greece was created in 1988.
Ecologists in Action was created in 1998.