Lecture 3 Flashcards
Atlantic Cod
high fecundity and mortality rates but low survival rates
elephants
Low reproductive rates but more offspring that survives
why do atlantic cod not survive past their first year
eggs are not protected, predators, food source for marine creatures, only 2 eggs survive per millions
Excess fucundity
if an average pair in a population produce less than 2 offspring the population will go extinct, vice versa
elephants reproduction
slowest breeders, begin when they’re 30 until they’re 90, bringing forth 6 young in the interval
excess fecundity results in
competition to survive and reproduce and expansion is limited
Above an organism in an ecological food chain
predators and parasites seeking to feed off it
Below an organism in an ecological food chain
food resources it must consume to stay alive
who do organisms scompete with the most
other organisms of their own species because they have the most similar ecological needs of its own
4 conditions to natural selection
Reproduction, heredity, variation in individual characters and variation in the fitnessre
production
entities must reproduce to form a new generation
heredity
the offspring must tend to resemble their parents: like must produce like
variation in individual characters
among members of the population
variation in the fitness
of organisms according to the state they have for a heritable character
Fitness
the average number of offspring left by an individual relative to the number of offspring left by an average member of the population
