Flashcards in Chapter 53: Population Ecology II Deck (14)
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1
Importance of population growth?
- Impacts harvesting regulations, endangered species
2
Learn from demography of human populations that...
- Humans cannot grow indefinitely
3
What is known about population growth of humans globally in different regions
- Grow most rapidly in Asian countries; relatively rapidly in Americas
4
Age structure (def. + what it informs us)
- Distribution of various age groups in a population (form semblance of pyramid)
- Illustrates growth pattern of population
5
Immigration (def.)
Influx of individuals
6
Emigration (def.)
Movement of individuals out of an area
7
Importance of immigration and emigration in metapopulations?
Populations are linked together through emigration and immigration
8
Metapopulation (def.)
Group of populations that are separated by space; spatially separated populations interact
9
Importance of habitat fragmentation?
- Affects the makeup of the population
10
Relationship between patch area and population extinction rate/distance between patches and population extinction rate?
- Colonization increases when distance between patches is lower
- Population also increases with larger patch area
11
How population ecologists study populations?
- Direct observations (traps, nets, fluorescent powder)
- Indirect observations (scat, tracks, other signs)
12
Estimating population size?
- N = sn/x (x = number of marked individuals recaptured in second sampling; s = number of individuals captured in first sample; n = total number of individuals captured in second sampling)
13
Challenges in studying populations?
- Incomplete sampling (incomplete and variable detection)
14
