07 populations Flashcards
The technical term for birth rate is ______
natality.
When a number of individuals of a species movesinto an area, this is referred to as _____
immigration
Another word for “death rate” is ______
mortality.
When a number of individuals of a species movesout of an area, this is referred to as ______
emigration.
The maximum number of individuals that anecosystem could hold assuming ideal conditions isreferred to as _______
biotic potential
That non-living thing that can increase ordecrease the size of a species in a population iscalled the _____ factor.
abiotic
The maximum number of individuals of aspecies that can be supported by an ecosystemis called the ______of theecosystem
carrying capacity
If there are a large number of trees in asmall area in a forest, we say that the _____of the trees is large
density
Those factors that affect all the living thingsin an environment regardless of the density arecalled ______ factors
density-independent
Those factors that affect the living things inan environment where the density is importantare called _____ factors.
density-dependent
What change in the way humansobtained their food caused the humanpopulation to grow in a significant way??
When humans moved away from thehunter-gatherer way of obtaining foodto agriculture, human population grew.
Suppose that a town starts with apopulation of 10 000 people. In one year,natality accounts for 50 individuals andmortality has 40 people. The immigrationnumber is 20 and the emigration is 60.What is the new population of thetown?
The new population is:10 000 + (50 + 20) – (40 + 60) = 9970 people.
give a name to that bioticpotential of: The number of times a species reproduces each year
This is called “procreation.
give a name to the biotic potential: Of all the offspring that a species produces, this refersto the number that reach the age of reproduction.?
“capacity for survival.”
give a name to that bioticpotential of: Some living things produce only 1 offspring. Other livingthings can produce many more.
“birth potential.”
give a name to that bioticpotential of: Animals have differing number of years when they canreproduce and make more of their young
“length of reproductive life.”
Suppose you want to plant peas in your garden and get thehighest yield possible. What are 2 abiotic factors that could increase and 2 that could decrease your total yield?
abiotic that could increase: warm/sunny weatherproper amount of waterabiotic that could decrease:hot dry weathernot enough nitrogen in the soil
Suppose you want to plant peas in your garden and get thehighest yield possible.b) What is one biotic factor that could increase the number ofpea plants and a biotic factor that could decrease the plantpopulation?
1 biotic increase could be nitrogen fixing, bacteria in the soil, or earthworms1 biotic that could decrease could be rabbits that eat them.
say if the example given is density dependant or density independent: Disease caused by a microorganism or aparasite.
Density-dependent
say if the example given is density dependant or density independent: Destruction of the habitat due to burning offorests.
density independent:
say if the example given is density dependant or density independent: Spraying a lawn with pesticides.
density independent:
say if the example given is density dependant or density independent: Introducing more wolves into an area tocontrol rabbit population.
Density-dependent
Cedar waxwings are one of the birds that can withstandthe cold and available food during our winters. To ease thestrains of winter, bird watchers provide the waxwings withseeds during the winter months.a) Would the seeds alter the carrying capacity of theecosystem? Explain
The carrying capacity increases because it is possiblefor more birds to survive the winter, especially if thereis a heavy snow cover.
Cedar waxwings are one of the birds that can withstandthe cold and available food during our winters. To ease thestrains of winter, bird watchers provide the waxwings withseeds during the winter months. b)Provide a hypothesis that explains why bird watchershave noted an increase in the falcon population in recentyears.
If there are more cedar waxwings, the falcons areattracted to this food supply, so there are more ofthem.
