Extinction Risk Flashcards
What are the 5 different types of extinctions?
extinct, extinct in the wild, locally extinct, functionally extinct, and mass extinction
What is the term that is described as a group that consists of spatially separated populations of the same species which interact at some level
metapopulation
What is the term that is described as the situation in which the fitness is based on the population size?
allee effect
What are some risk factors when it comes to extinction vulnerability?
small population size, islands, hunting/harvesting, slow reproduction, large home range or body size
What are some effect of a small population?
genetic drift, inbreeding/out-breeding depression, and loss of evolutionary flexibility
What is drift?
Drift is the stochastic process of allele frequency change.
What does Ne mean?
effective population size; how many reproductive individuals there are
What is the difference between inbreeding and out-breeding depression?
inbreeding depression is the decrease in fitness that occurs in the offspring of related parents, and out-breeding depression is the decrease of fitness when organisms reproduce outside of the original population
What term is described as when hybrids are more fit than parental species?
hybrid vigor
Census size does not equal effective population size, why is that?
some individuals are too young, sterile, have poor health, and are unable
What is the term that is described as the random fluctuations in population size that occur because the birth and death of each individual is a discrete and probabilistic event?
demographic stochasity
What is the term that is described as when species are going extinct but haven’t yet?
extinction debt
