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12 Cards in this Set
- Front
- Back
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Population density |
a measurement of population per unit area or unit volume; it is a quantity of type number density |
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Population distribution |
the arrangement or spread of people living in a given area; also, how thepopulation of an area is arranged according to variables such as age, race,or sex |
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age structure |
a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing |
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density dependent factors |
In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population.[1] This article will focus on density-dependence in the context of macroparasite life cycles |
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Growth Rate |
the rate at which the number of individuals in a population increases in a given time period as a fraction of the initial population |
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exponential growth model |
occurs when the growth rate of the value of a mathematical function is proportional to the function's current value |
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k-selected species |
K-selected species possess relatively stable populations and tend to produce relatively low numbers of offspring; however, individual offspring tend to be quite large in comparison with r-selected species |
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competitive exclusion principle |
sometimes referred to as Gause's law of competitive exclusion or just Gause's law, is a proposition that states that two species competing for the same resource cannot coexist at constant population values, if other ecological factors remain constant |
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Parasitoid |
an organism that spends a significant portion of its life history attached to or within a single host organism in a relationship that is in essence parasitic; unlike a true parasite, however, it ultimately sterilises or kills, and sometimes consumes, the host |
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Keystone Species |
a species that has a disproportionately large effect on its environment relative to its abundance |
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Ecosystem Engineers |
is any organism that creates, significantly modifies, maintains or destroys a habitat. These organisms can have a large impact on the species richness and landscape-level heterogeneity of an area |
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Primary Succession |
is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substratedevoid of vegetation and usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.
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