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Ecology
Question | Answer |
---|---|
population growth | births+immigration-deaths-emigration |
new population | initial population+(pg)(#years) |
growth rate | population growth/initial populationx100 |
two factors that increase a population are | births and immigration |
two factors that decrease a population are | deaths and emigration |
open populations | has all four factors acting on them |
closed populations | have births and deaths acting on them but do not have immigration or emigration because organisms cannot move in and out |
carrying capacity | the maximum number of individuals of a species that can be supported indefinitely by the ecosystem |
density | refers to the number of organisms in an area |
biodiversity | the number and variety of organisms found in a specific region |
canopy fogging | use of non-lethal doses of insecticide to sample insect populations in forest canopies |
quadrant sampling | sampling of several smaller pieces of a much larger area in order to obtain an accurate measure of biodiversity without studying the entire area |
transect sampling | use of a line through the sampling area; at specific intervals, the type and number of species along the line are recorded |
netting | fine mesh nets are used to capture birds and bats in terrestrial ecosystems, and fish and other organisms |
habitat loss | occurs when events, due to natural disasters or human activities, alter a terrestrial or aquatic ecosystem so much that many species can no longer |