Human Impact- Science Flashcards
what does exponential growth mean
when population increases rapidly
what supports the growth of a population
biodiversity, resources
what is the difference between exponential and logisitical growth
exponential=unlimited resources; logisitcal=limited resources
what determines carrying capacity of an ecosystem
density dependent limiting factors
how do emigration and immigration effect population growth
if animals emigrate, population will go down, BR will go down; if animals immigrate, population will go up, BR goes up
how do you explain predation
if there is no prey, an ecosystem is not healthy
what is the relationship between predator-prey and carrying capacity
carrying capacity refers to the number of predators and prey living in a certain area
what is parasitism
predator benefits, host injured; predator kills what it is feeding on/in
what are the different type of symbiosis
mutualism, parasitis, commensalism, competion
what is a limiting factor
something that controls growth, grouped together as density independent/dependent
what is the difference between steady state and carrying capacity
steady state: BR=DR; carrying capacity: the number of organisms that can fill an area
how does density relate to limiting factors
limited resources are a limiting factor which means there is not enough density for organisms to survive in a certain area
what is the different between density independent and density dependent
density dependent: number of individuals is a limiting factor (ex. competition); density independent: number of individuals in not a limiting factor (ex. disease)
why are humans still in exponential growth
because we have no predators
how are limiting factors and carrying capacity related
limiting factors effect carrying capacity because of the amount of resources available
what is biodiversity
number of organisms in an ecosystem
what is a hot spot
area with less resources that it could possibly turn into a dead zone
what is emigration
permanent exit out of an ecosystem
what is density
amount of objects in a certain area
what is competition
overpopulated species compete for food, space, sunlight, water oxygen, mates
what is invasive species
species that do not belong in an ecosystem and have no predator
what is predation
predator-prey relationship keeps a healthy ecosystem; there should be more prey than predator
what is carrying capacity
amount of resources in an ecosystem to support the survival of organisms living there
what is natural selection
selecting in nature
what is symbiosis
specific relationships between two individuals of different species
what is mutualism
both species benefit
what is commensalism
predator benefits/host not effected
what is parasitism
predator benefits/host injured
what is crowding
high number of individuals in one space; leads to stress
what is stress
body releasing enzymes
