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16 terms

Unit 2 - Chapter 15 - Population Dynamics

This quiz looks at factors that affect the abundance and distribution of oragnaisms and techniques used to estimate various populations.
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Exponential growth
Growth of a population in an ideal, unlimited environment, represented by a J-shaped curve when population size is plotted over time.
Abundance
An expression of the total number of organisms in a biological community.
Biodiversity
Total variety of living organisms in an area or on earth as a whole.
carrying capacity
Largest number of individuals of a population that a environment can support
closed population
Only natality and mortality affect an organism's population size - not migration.
Community
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
Density dependent
Referring to any characteristic that varies according to an increase in population density.
Density independent
Referring to any characteristic that is not affected by population density eg. weather events
K-selected species
Species that produce a few, often fairly large offspring but invest a great deal of time and energy to ensure that most of those offspring reach reproductive age. Compare r-selected species.
r-selected species
Species that reproduce early in their life span and produce large numbers of usually small and short-lived offspring in a short period.
Logisitic growth
A model describing population growth that levels off as population size approaches carrying capacity - flattened S-shaped curve.
Mark-Recapture
Capturing and marking or tagging organisms, then recapturing them and counting how many are marked to estimate population size.
Immigration
migration into a place (especially migration to a country of which you are not a native in order to settle there)
species richness
the number of species in a biological community.
Transects
Line through an area. regular intervals along line using quadrat. Used where enviroment changes gradually
quadrats
Marking off a small area + counting the species (for finding pop. density) for plants and other non-motile organisms especially.