Flashcards in Chapter 53: Population Ecology II Deck (14)
Importance of population growth?
- Impacts harvesting regulations, endangered species
Learn from demography of human populations that...
- Humans cannot grow indefinitely
What is known about population growth of humans globally in different regions
- Grow most rapidly in Asian countries; relatively rapidly in Americas
Age structure (def. + what it informs us)
- Distribution of various age groups in a population (form semblance of pyramid)
- Illustrates growth pattern of population
Influx of individuals
Movement of individuals out of an area
Importance of immigration and emigration in metapopulations?
Populations are linked together through emigration and immigration
Group of populations that are separated by space; spatially separated populations interact
Importance of habitat fragmentation?
- Affects the makeup of the population
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
How population ecologists study populations?
- Direct observations (traps, nets, fluorescent powder)
- Indirect observations (scat, tracks, other signs)
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)
Challenges in studying populations?
- Incomplete sampling (incomplete and variable detection)