Test 3 vocab Flashcards

1
Q

population ecology

A
  • the study of populations (the numbers of individuals of a particular species at a given time and location), and their interactions with the environment
  • mortality
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

density

A

the number of individuals of a species per unit space (volume)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

births

A
  • add to a population;
  • natality
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

immigration

A
  • the influx of new individuals into a population from other area
  • the migrations of individuals into the population
  • i
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

deaths

A
  • which remove individuals from a population
  • mortality
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

emigration

A
  • the movement of individuals out of a population
  • the migration of individuals out of the population
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

dispersion

A

the pattern of spacing among individuals within the boundaries of a population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

clumped dispersion

A

type of distribution where individuals aggregate in patches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

uniform dispersion

A

type of distribution where individuals are more evenly distributed than would be expected randomly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

random dispersion

A

type of distribution where the position of each individual is independent of other individuals (unpredictable spacing)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

demography

A

the study of changes over time in the vital statistics (birth and eath rates, ect.) of population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

life table

A

an age-specific summary of the survival pattern of a population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

cohort

A

a group of individuals of the same age from birth until all of the individuals are dead

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

survivorship curve

A

is a graphic way of representing the data in a life table (age-specific mortality)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Type I curve

A

low death rates during early and middle life (flat curve at the state) and an increase in death rates among older age groups (curve drops steeply)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Type II curve

A

a constant death rate over the organism’s life span

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Type III curve

A

high death rates for the young (curve drops steeply at the start) and a lower death rate for survivors( curve flattens out)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

reporductive table (fertility schedule)

A

is an age-specific summary of the reproductive rates in a population

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

ΔN

A

is the change in population size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Δt

A

is the change in time (generation time or life span)

21
Q

b

A

is the natality (birth) rate; aka per capita birth rate

22
Q

natality rate (per capita birth rate)

A

the number of offspring produced per unit time per average individual (per capita) of the population

23
Q

d or m

A

the mortlality (death) rate; aka per capita death ate

24
Q

mortality (death) rate

A

the # of expected deaths per unit time in a population

25
N
the population size
26
mathmatical models describe population growth
* ΔN/Δt=bN-dN * r=b-d to find the rate of growth * dn/dt=rN to find to total growth during set time
27
r
the per capita rate of change (growth rate)
28
zero population growth
the population is stable; occurs when natality and mortality are equal
29
dispersal
the movement of individuals among populations
30
exponential population growth
growth of a population increases at a constant rate (only occurs under idealized conditions)
31
J-shaped curve
when population size is plotted over time showing exponential growth
32
carrying capacity (K)
the maximum population size the environment can sustain
33
logistic population growth
* model describes how a population grows more slowly as it nears its carrying capacity * dN/dt=rN[(K-N)/K]
34
S shaped growth curve
growth regulated by environmental resistance shows
35
36
semelparity (big-bang reproduction)
reproduction in which an organism produces all of its offspring in a single event
37
iteroparity (repeated reproduction)
reproduction in which an organism produces offspring over many years (repeatedly)
38
R-strategists
organism that prossess traits to increase the growth rate (r)
39
r-selection
* density-indepentent selection * selects for life history traits that maximize reproductive success in uncrowded environments (abandoned agriculture field or burned area)
40
K-strategists
organisms that posses traits to ensure that the population of a species doesn't exceed the carrying capacity
41
K-selection
* density-dependent selection * selects for life history traits that are sensitive to population density
42
density -independent factors
limit population size
43
density-dependent factors
* regulate population size. birth rates fall and death rates rise with population density * competions for resources * toxic wastes * predation * intrinsic (physiological) factors * territoryiality * disease
44
competition for resources
* in crowded population, increasing poulation density intensifies competition for resources and results in a lower birth rate * intraspecific * interspecific
45
intraspecific
competions exists between members of the same species
46
interspecific
competion exists between memebers of different species
47
age structure
the relative number of individuals of each age in a population
48
people over population
is a result of too many people living in certain area
49
consumption overpopultation
is a result of people over-utilizing resources