Populations Flashcards
Population
is a group of organisms of the same species which have the potential to inbreed or a group of organisms of the same species occupying a particular place at a particular time
Population distribution
how individuals in a population are dispersed in space
Population demography
study of the vital statistics or properties of a population (age, structure, birth, death, migration, growth, reproduction, and etc)
Population genetics
study of the distribution and change of allele frequencies as a result of evolutionary processes (natural selection, genetic drift, gene flow, and etc.)
Population density
number of individuals per unit area or volume
Population distribution
pattern of dispersal of individuals within the area of interest
Emigration
movement of an organism out of a given habitat or area
Immigration
movement of an organism into a given habitat or area
Migration
is directed dispersal with a return to the site of origination
Catadromous
organism that lives in freshwater, but migrates to marine waters to breed/spawn
Viviparous
bringing forth live young that have developed inside the body of the parent
Propagules
a vegetative structure that can become detached from a plant and give rise to a new plant, e.g., a bud, sucker, or spore
Metapopulation
is a series of small, discrete populations united together by dispersal
Corridors
Link core biological areas, allowing animals movement between areas
Unitary organism
individuals are highly determinate in form and while growing pass through predictable (innately determined) sequences of life history stages
Modular organism
zygote develops into unit, or module, which produces more modules thus producing an organism with a variable number of modules, whose development is unpredictable and strongly influenced by environmental factors
Genets
are individual plants or zygotes produced by sexual reproduction
Ramets
are asexually produced individuals derived from the parent zygote or genet
Demography
is the study of processes that influence population size - it is the way we study changes brought about by births, deaths, and dispersal
Natality
may think of this as births, but includes more than just birth - hatching, germination, and fission
Fecundity
number of offspring produced per unit of time
Realized fecundity
actual number of survivors
Mortality
death rate; how many deaths per unit of time
Survivorship
how man survive (don’t die) per unit of time
Longevity
life expectancy; examines life-span of individuals
