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Environment
Terms to Know
Question | Answer |
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Populations | All the individuals of a species that inhabit a particular place at the same time |
Genetic Diversity | The sum of the different genes and gene combinations found within a single population of a species and across populations of the same species |
Population Density | The number of individuals inhabiting some defined area |
Carrying Capacity | The number of individuals in a population that an environment can support long term |
K-selected Species | Organisms with populations that generally stabilize close to their carrying capacity and are often regulated by density dependent factors (Whales, bears, wolves, gorillas) |
r-selected Species | Organisms with populations that generally fluctuate widely in size; subject from catastrophic mortality from harsh weather, fires, and other density independent factors (Mice, rabbits, dandelions, cockroaches) |
Infraspecific Competition | Competition among individuals of the same species |
Interspecific Competition | Competition among individuals of different species |
Invasive Species | An introduced species that poses a serious threat to native populations |
Biodiversity Hotspot | A region that supports at least 1,500 endemic plant species, approximately 0.5% of the world total, and that has been reduced in area by at least 70% |
Keystone Species | Species with substantial influence on community structure, despite its low biomass or #s relative to other species; the influence of these species is often exerted through feeding activities; usually toplevel predators sea stars, sea otters, jaguars |
Umbrella Species | Species whose protection provides protection for the entire ecosystem on which that species depends |
Flagship Species | Species that attracts and sustains human interest in protecting ecosystems |
Demography | The statistical study of populations, generally human populations, including their density, growth, age structure, birthrates, and death rates |