Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Population definition
|
A population is a group of organisms in a single species.
|
|
|
population density
|
Population Density is a measurement of population per unit of volume
|
|
|
population growth
|
Population Growth is the increase in the number of individuals in a population
|
|
|
examples of populations
|
pack of wolves streak of tigers flock of sheep herd of cows |
|
|
lag phase |
may last a few minutes or several days little or no cell multiplication/growth period of adaptation to environment intense metabolic activity (enzyme synthesis) |
|
|
log phase
|
more individuals available for reproduction population size increases birth rate>death rate |
|
|
stationary phase
|
population has reached its maximum carrying capacity some factors have limited population growth birth rate=death rate |
|
|
death phase
|
death rate> birth rate caused by loss of nutrients, parasitism, build up of toxic waste |
|
|
carrying capacity
|
Number of individuals that can be supported in a given area at a given time
|
|
|
Environmental Resistance
|
All factors that may limit the growth of a population.
|
|
|
Examples of Environmental Resistance
|
food availability overcrowding disease parasitism weather competition predation accumulation of toxic waste |
|
|
What is the growth of a population determined by?
|
Birth rate and death rate
|
|
|
Immigration
|
movement of individuals into a population permanently
|
|
|
migration
|
periodical seasonal movement where population can vary massively over a year
|
|
|
emigration
|
movement of individuals out of a population (non-reversible/one way)
|
|
|
Factors that may stimulate immigration/emigration?
|
predation lack of food overcrowding |
|
|
Difference between migration and emigration?
|
migration relates to whole populations whereas emigration relates to individuals of a population
|
|
|
density dependent factors
|
disease parasitism competition food availability accumulation of toxic waste |
|
|
Density Independent
|
Fire storms floods predation freezing change in PH levels any other abiotic factors |
|
|
population fluctuations
|
Size of population is regulated by birth and death rate. Fluctuations are normally small. Species lie near an equilibrium which is known as the set point.
|
|
|
|
|
|
|
|
|
|
|
|
|
