Unit 3 Vocabulary ( Populations )
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Natality
-# of individuals added through reproduction + Crude Birth Rate (CBR) Births per 1000
Mortality
-#of individuals eliminated by death + Crude Death Rate (CDR) Deaths per 1000
Migration
-The move in or move out of a population +Metapopulation- a groups of specially separated groups but interconnected populations of the same species that interact through migration
Density Independent
+A sort disturbance that will affect a population dispersion (no matter the dispersion) they’ll feel it equally
Density Dependent
+Groups of populations with high density will feel the disturbance more than others
Biotic Potential
+Populations potential for growth (high biotic potential means high # of babies)
Fecundity
+the biological capcity of an individual or population to produce offspring
Intrinsic rate of increase (R)
+The rate of population growth with unlimited resources doesn’t really exist
Logistic Growth
+S-growth +exponential growth until reaches carrying capacity of enviornment
Carrying Capacity (K)
+# of species individuals that can be sustained indefinitely in a specific space
Overshoot
+when population exceeds k
Dieback
+rapid decline or shortage of population due to overshoot
r- Strategists
+ Usually a generalist (think of mice) - reproduce a lot more offspring -live in exponential growth -barely to almost no parental care -short life -high population number
k-Strategists
+ Usually a specialist (think of bears) -reproduce few offspring -maintain stable population at carrying capacity -long life -more parental care activity is done so that offspring can make it to adulthood
Survivorship curves
+represents different patterns related to species survival as a function of age
Type 1 (Survivorship curve)
+ Long life - most will die of old age
Type 2 (Survivorship curve)
+constant decline in survivorship -half will make it or so so
Type 3 (Survivorship curves)
+Low survivorship in early life -few individuals make it to adulthood because most die early
Rule of 70
+estimates the doubling time of a population Formula:70/populations annual growth rate (as a percentage)
Malthus Theory
+ Human growth cannot grow exponentially because at some point in time, resources and materials will become more scarce
Developing nations
+ a country with low industrialization and income
Developed nations
+ a country with high industrialization and income
Total Fertility Rate (TFR)
+ # of babies born per 1000 women in a population
Replacement Fertility Rate
+ the total fertility rate for a nation that would keep it’s population stable