24) Populations and Sustainability Flashcards
what is population size
total number of organisms of one species in a habitat
Why does population size varies bc of abiotic factors
ideal cond - organismms grow fast and reproduce successfully
arent ideal cond - cannot grow or reproduce successfully
What are the main 3 biotic factors agains pop size
interspecific comp
intraspecific comp
predators
Interspecific competition affect pop size
Resources available to both pop are reduced
(same source - less available , limited by amouont of food. less energy fir grrowth and reproduction. pop size lowers for both species)
interspecific competition on distribution of species
one is better adapted , less adapted becomes out-competed
Intraspecific competition affecting population size
pop inc when resources are plentiful - more organisms competing for same space and food
Resources become limiting - pop begin to decline
small pop- less competition , better for growth and reproduction - pop grows again .
Max stable pop size = carrying capacity
What is predation affect on population sizw
1) As prey population ince ,more food for predators , predator pop inc
2)Predator pop inc , more prey eaten , prey pop dec.
(-ve feedback , prey pop stable)
3) Less food for predators,so pop dec
give an eg of an abiotic limiting factor on population size
shelter - enough for certain individuals
give example on biotic limiting factor on population size
intrerspecific comp limit - reduced available resources
why is conservation describes as a dynamic process
methods need to be adapted to the constant changes in an ecosystem
what is reclamation in conservation
restoring ecosystem that has been damaged or destroyed so they can be used again
Ecenomic reasons for conservation
provide resources used by humans.
resources will be lost , red trade
social reasons for conservation
bring joy and attractive to look at
ethical reasons for conservation
the right thin to do , shouldn’t become extinct bc of human activity.
how is preservation different from conservation
protection of ecosystem so theyre kept exactly as they are.nothing removed from ecosystem
