Population dynamics Flashcards
population dynamics
how a population changes overtime
minimum viable population
how many individuals a population needs to survive
random distribution
neutral interactions, randomly placed
regular distribution
regularly spaced, sustainable resources
clumped distribution
come together for mating
closed system
no additional food/migration/predation, exponential growth then stationary phase then decline
what’s stationary phase
where births/deaths equal
what’s open system
additional food/migration/predation, has carrying capacity
oligotrophic
limited by certain resources
what’s biomass and the biomass model
harvested species, influenced by recruitment/growth/mortality
factors influencing biomass model
fish genetics/behaviour/food
recruitment
recruits young, influenced by food/predation, density dependant
growth
influenced by mortality, critical to stocks
mortality
influenced by diseases/predation, expressed as rate
who’s at most predation risk
juveniles
what causes dispersal
currents, disperse for food, climate change
populations most likely to go extinct are…
large populations, populations with large geographic range, populations with large habitat tolerances
extinctions happen that we don’t know about happen because
of not knowing species/broad geographic bias
sea cow
sea cows went extinct because of poaching of otters dying that ate urchins that ate kelp that was sea cows food
