Natality and Survivorship determine reproductive rates
We determine reproductive rates using life tables. Life tables are an account book of death, giving us information such as the age at which females give birth and the age at which a population dies. This is a little more confusing for plants because their asexual behavior does not allow for the separation of male and female.
Rate of Population Increase
rate of increase ®-describes instantaneous population growth
Stable Age Distribution:
A stable age distribution is one in which the properties of each age class remain the same, even though the
population is growing.
Population Growth is Limited by the Environment
We have run out of food
Low Population may Equal EXTINCTION!!
Are Extinctions Spread Evenly Throughout our Perception of Time in this Reality?
Permian period (225 mil.yrs ago)- 90% of shallow-water marine invertebrates disappeared
Cretaceous period (65-125 mil.yrs ago)-dinosaurs
Pleistocene (11,550-10,000 yrs ago)-woolly mammoth, giant deer, mastodon, giant sloth
Laughing Owl, (Sceloglaux albifacies)
Native to New Zealand, this owl was known for its call that sounded as soon as it awakened every night. It disappeared because humans introduced animals that easily hurt the bird.
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