PCB 3043- Exam 1- Terms Questions And
Answers 100% Correct
Ecology - answer "The scientific study of the relationships between organisms and their
environment".
Doubling Time - answer John Graunt made a theoretical prediction of the growth of the
City of London, showing that the population was doubling every 64 years. He then
speculated that if the world began with one biblical date at the time of 3948 BC and
started with 2 people (Adam and Eve), and doubled every 64 years, then the world would
have "far more People then are now in it." In fact, this works out to be about 100 million
people per square centimeter of habitable land.
Population - answer a group of (interbreeding) individuals found in the same space or
area at the same time
Demography - answer the study of the age structure and growth rate of populations
Density - answer the number of individuals in relation to the space or volume in which
they occur
Distribution - answer of a population describes its geographic and ecological range,
primarily determined by suitable conditions or "habitats" for individuals of the species.
Dispersion - answer the spacing of individuals with respect to one another
Fecundity - answer reproductive output under ideal conditions, limited by genetics, not
the environment
Fertility - answer the actual reproduction in a given environment. Note that it must be
less or equal to the fecundity
Immigration - answer number of individuals that join the population per unit time
Emigration rate - answer number of individuals that leave the population per unit time
Closed Population - answer If there is no movement of individuals between different
populations, then the numbers of individuals are determined by local processes
Open Population - answer if there is significant movement of individuals between
populations
Discrete growth - answer all individuals pass through life stages at the same time, often
common with organisms affected by season
Continuous growth - answer individuals in a population are relatively independent in
, terms of when they are born, reproduce, and die. This results in overlapping
generations
Population growth rate - answer population births - population deaths
Per-capita growth rate - answer (1/N)(dN/dt) = r
r - answer is defined as the intrinsic rate of increase
Exponential growth equation - answer if r remains constant, it will describe a population
that grows exponentially
(dN/dt)=rN
R0 - answer multiplicative (per generation) growth rate, primarily used for populations
that have discrete growth patterns. (Net reproductive rate)
Discrete exponential growth equation - answer Nt = N0 x Rt
Logistic growth - answer As the population increases, the population growth rate first
increases, then decreases
Competition - answer a biological interaction between two or more individuals for a
resource in short supply
Intraspecific - answer within species
Interspecific - answer between different species
Environmental stochasticity - answer temporal variation due to unexpected events in the
environment such as drought, fires, diseases, etc. This can affect large or small
populations.
Demographic stochasticity - answer variation in population growth rates arising from
differences among individuals in survival and reproduction.
Allee effect - answer increased per-capita growth rate with increasing density, only
observed when population densities are low
Minimum viable population size - answer is a lower bound on the population of a species,
such that it can survive in the wild. "Associated with the study of Bighorn sheep by
Berger."
Answers 100% Correct
Ecology - answer "The scientific study of the relationships between organisms and their
environment".
Doubling Time - answer John Graunt made a theoretical prediction of the growth of the
City of London, showing that the population was doubling every 64 years. He then
speculated that if the world began with one biblical date at the time of 3948 BC and
started with 2 people (Adam and Eve), and doubled every 64 years, then the world would
have "far more People then are now in it." In fact, this works out to be about 100 million
people per square centimeter of habitable land.
Population - answer a group of (interbreeding) individuals found in the same space or
area at the same time
Demography - answer the study of the age structure and growth rate of populations
Density - answer the number of individuals in relation to the space or volume in which
they occur
Distribution - answer of a population describes its geographic and ecological range,
primarily determined by suitable conditions or "habitats" for individuals of the species.
Dispersion - answer the spacing of individuals with respect to one another
Fecundity - answer reproductive output under ideal conditions, limited by genetics, not
the environment
Fertility - answer the actual reproduction in a given environment. Note that it must be
less or equal to the fecundity
Immigration - answer number of individuals that join the population per unit time
Emigration rate - answer number of individuals that leave the population per unit time
Closed Population - answer If there is no movement of individuals between different
populations, then the numbers of individuals are determined by local processes
Open Population - answer if there is significant movement of individuals between
populations
Discrete growth - answer all individuals pass through life stages at the same time, often
common with organisms affected by season
Continuous growth - answer individuals in a population are relatively independent in
, terms of when they are born, reproduce, and die. This results in overlapping
generations
Population growth rate - answer population births - population deaths
Per-capita growth rate - answer (1/N)(dN/dt) = r
r - answer is defined as the intrinsic rate of increase
Exponential growth equation - answer if r remains constant, it will describe a population
that grows exponentially
(dN/dt)=rN
R0 - answer multiplicative (per generation) growth rate, primarily used for populations
that have discrete growth patterns. (Net reproductive rate)
Discrete exponential growth equation - answer Nt = N0 x Rt
Logistic growth - answer As the population increases, the population growth rate first
increases, then decreases
Competition - answer a biological interaction between two or more individuals for a
resource in short supply
Intraspecific - answer within species
Interspecific - answer between different species
Environmental stochasticity - answer temporal variation due to unexpected events in the
environment such as drought, fires, diseases, etc. This can affect large or small
populations.
Demographic stochasticity - answer variation in population growth rates arising from
differences among individuals in survival and reproduction.
Allee effect - answer increased per-capita growth rate with increasing density, only
observed when population densities are low
Minimum viable population size - answer is a lower bound on the population of a species,
such that it can survive in the wild. "Associated with the study of Bighorn sheep by
Berger."
