Bio 2 Flashcards
(21 cards)
Climax Community
a stable mature community in a successive series which has reached equilibrium after having evolved through stages and adapted to its environment
Pioneer species
Pioneer species are hardy species which are the first to colonize previously disrupted or damaged ecosystems, beginning a chain of ecological succession that ultimately leads to a more biodiverse steady-state ecosystem.
Disturbance
disturbance is a temporary change in environmental conditions that causes a pronounced change in an ecosystem
Stability
Ecosystem stability is an important corollary of sustainability. Over time, the structure and function of a healthy ecosystem should remain relatively stable, even in the face of disturbance. If a stress or disturbance does alter the ecosystem is should be able to bounce back quickly.
Density Independent
density-independent factor Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. An example of such a factor is an earthquake, which will kill all members of the population regardless of whether the population is small or large.
Density Dependent
density-dependent factor Any factor limiting the size of a population whose effect is dependent on the number of individuals in the population. For example, disease will have a greater effect in limiting the growth of a large population, since overcrowding facilitates its spread.
Population Density
Population density (in agriculture : standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.
Population
A population is a summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.
Primary Succession
A population is a summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.
Inbreeding
breed from closely related people or animals, especially over many generations.
Dispersion
the action or process of distributing things or people over a wide area.
Life Expectancy
The age you expect to live by
Immigration
Organisms moving into an area
Emigration
Organisms moving out of an area
Birth rate
Rate of births
Ecological Succession
Ecological succession is the observed process of change in the species structure of an ecological community over time. The time scale can be decades (for example, after a wildfire), or even millions of years after a mass extinction.
Growth Rate
The amount of increase that a specific variable has gained within a specific period and context
Agricultural Rev.
An agricultural revolution or agrarian revolution is a period of transition from the pre-agricultural period characterized by a Paleolithic diet, into an agricultural period characterized by a diet of cultivated foods; or a further transition from a living a more advanced and more productive form of agriculture, …
Hunter Gatherer Lifestyle
A hunter-gatherer or early human society is one in which most or all food is obtained from wild plants and animals, in contrast to agricultural societies, which rely mainly on domesticated species.
Death Rate
Mortality rate, or death rate, is a measure of the number of deaths (in general, or due to a specific cause) in a particular population, scaled to the size of that population, per unit of time.
Secondary Succession
Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat
