19.2 Variation in population size Flashcards

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1
Q

define population size

A

the number of individuals of a species in one area

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2
Q

what does it mean when a population size is dynamic?

A

it varies

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3
Q

what is population size affected by?

A
  • abiotic factors (temp, light, pH, water and humidity)
  • intraspecific comp
  • interspecific comp
  • predation
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4
Q

what is it called when the line graph almost plateaus?

A

carrying capacity

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5
Q

define carrying capacity

A

maximum stable population size that an ecosystem can support

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6
Q

what abiotic factors affect population size

A
  • pH
  • H2O
  • mineral content of soil
  • light (photosynthesis)
  • O2 conc (aerobic respiration)
  • temp
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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

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