Exam 2 Flashcards
(42 cards)
Steve Fretwell
Developed habitat selection model based on ideal free distribution
Raymond Pearl
First to describe three survivorship curves
Richard Levins
Developed metapopulation model
Type I survivorship
most mortality occurs late in life
Type III survivorship
most mortality occurs in juveniles
O horizon
topmost layer consisting of heterogenous plant litter and homogenous decomposed organic matter (humus)
E horizon
sometimes found between A and B horizons; zone of maximum leaching
B horizon
zone of deposition or accumulation; red from clay and Ca, Al, and Fe oxides; subsoil
loam
soil made up of similar proportions of sands, silts, and clays
hydroscopic water
water tightly bound to soil particles
J.B.S. Haldane
Regulating/limiting factors must explain number of individuals in a population
A. J. Lotka
Described intrinsic rate of increase
Garrett Hardin
Wrote ‘The Tragedy of the Commons’
Rachel Carson
Wrote ‘Silent Spring’
geographic range
total observed geographical area in which the species currently resides
deme
subpopulation consisting of individuals in one patch that have a high potential to interbreed amongst themselves
neighborhood size
number of conspecifics that an organism could meet throughout its life
Allee effect
a decline in birth rates or survival at a low population size
home range
an area in which an animal lives and generally spends most of its time moving through; area is generally too large to defend`
territory
smaller, defended area in which an animal lives, forages, and reporduces
stochastic model
model that incorporates predation, natural disasters, uneven sex ratios, etc. into intrinsic rate of increase
Type II survivorship - mortality
mortality rates are constant with age
horizontal/cohort life table
tracks one group of individuals born at a given time through time until last member dies
vertical/stable life table
looks at age structure of all cohorts at one time
