Download
1 / 11
140 likes | 328 Vues
Carrying capacity . PI 6.1 MU 6.1d 6.1e. Bell ringer question. List factors that can influence the population size of ducks in Onondaga L ake. -Available food source -Temperature -The quality of water -Etc . Exponential growth .
E N D
Carrying capacity PI 6.1 MU 6.1d 6.1e
Bell ringer question • List factors that can influence the population size of ducks in Onondaga Lake. -Available food source -Temperature -The quality of water -Etc
Exponential growth Living organisms have the capacity to produce populationsof unlimited size, BUT…. http://www.britannica.com/EBchecked/media/158213/In-an-ideal-environment-populations-grow-at-an-exponential-rate
Carrying capacity …BUT environments and resources are finite. The number of organisms any habitat can support (carrying capacity) is limited • by the available energy, water, oxygen, and minerals, and • by the ability of ecosystems to recycle the residue of dead organisms through the activities of bacteria and fungi.
Logistic growth The carrying capacity (K) limits the population growth.
Abiotic factors In any particular environment, the growth and survival of organisms depend on the physical conditions including • Light intensity • Temperature range • Mineral availability • Soil/rock type • Relative acidity (pH)
An example of abiotic factor • Certain fish species cannot live if dissolved oxygen concentration in water drops below a certain level. As water quality improves, more species of fish appear. http://pubs.usgs.gov/circ/circ1171/html/fishcom.htm
Bitoic factors The survival of organisms also depends on biotic factors such as • the population of an individual species • The interactions that a species has with other species (e.g. predator/prey, parasitism, commensalism, mutualism, etc.)
Example of a biotic factor • The population of lynx(predator) affects the population of snowshoe hare (prey). http://www.britannica.com/EBchecked/media/12/Cyclical-fluctuations-in-the-population-density-of-the-snowshoe-hare
