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Population test

What is a population? the number of individuals of a particular species that are found in an area.
Density is ___ the number of individuals per unit area or per unit volume at a given time.
Age Structure is ____. the relative proportions of individuals of each age.
What is exponential growth? Growth at a constant rate of increase per unit time.
Arithmetic growth_____ growth that increases at constant amount per unit time.
What is Biotic potential? the maximum rate in which a population can increase
What has high biotic potential? microorganisms
Density Independent any characteristic that is not affected by population density
Examples of density independent Lightning, hurricanes, floods, snowstorms, and fires
Density dependent referring to any characteristic that varies with population density
Density dependent mechanisms tend to ___________ reduce population size by decreasing or increasing mortality as population size increases
intraspecific interactions individuals within a population that can also compete for resources
R selected species The production of numerous small offspring followed by exponential population growth is the defining characteristic; little or no parental care; low ability to compete
K selected species large offspring, lower population growth, high parental care
Type I curve EX: elephant
Type II curve EX: lizards, and many birds
Type III curve EX: oysters, seastars, sea urchins, weeds
growth rate r=b-d
S Curve these populations are grown in constant environment lacking predators and competing species that may reduce growth of the populations, conditions that rarely occur in nature
a population that grows rapidly at first and then levels off at carrying capacity logistic equation
The logistic growth model differs from the exponential growth model in that it expresses the effects of population-limiting factors on exponential growth
biotic potential of a species is influenced by when reproduction begins, how often the organism breeds, and how many offspring are produced during each reproductive episode
Density Dependent Factors Competition for Resources; predation; toxic wastes; intrinsic factors; territoriality; disease
Created by: Jojotierra