19.2 Variation in population size Flashcards
1
Q
define population size
A
the number of individuals of a species in one area
2
Q
what does it mean when a population size is dynamic?
A
it varies
3
Q
what is population size affected by?
A
- abiotic factors (temp, light, pH, water and humidity)
- intraspecific comp
- interspecific comp
- predation
4
Q
what is it called when the line graph almost plateaus?
A
carrying capacity
5
Q
define carrying capacity
A
maximum stable population size that an ecosystem can support
6
Q
what abiotic factors affect population size
A
- pH
- H2O
- mineral content of soil
- light (photosynthesis)
- O2 conc (aerobic respiration)
- temp
7
Q
how does temperature affect population size?
A
- enzymes (bacteria, reptiles, plants)
- mammals
extreme temps = more energy to maintain body temp
= less energy available for growth/reproduction)
==pop size limited
