BIOL 102 Chapter Notes - Chapter 19: Population Ecology, Ocean Acidification, Daytime
● Some animals migrate to where temperature is better to sustain themselves
● Species are dependent upon each other
Consequences of climate change
● Warming trend de-syncs environmental cues
o Temp increase= cue for flowering, breeding
o Day length= cue for coat color change in artic animals
o Plants may bloom before pollinators emerge
● Spring snowmelt—earlier than usual
● Water source depleted before dry season ends
o Trees are drought stressed
o Dark beetles have two reproductive cycles
● Fire season last longer
● Melting permafrost
● Ocean acidification
Consequences of climate change
● Does climate change present a source of natural selection?
● Answer: Yes
● What are the characteristics of populations that would be most resistant to extinction
via climate change?
o Answer: variety and populations with shorter generation times who can adapt,
evolve, and reproduce more rapidly
Chapter 19: Population Ecology
● A population is a group of individuals of a single species that occupty the same general area
● Study invasive and endangered species
● Develop sustainable food sources
● Manage wildlife
● Control pests and pathogens
● Study human population growth
How is population ecology studied?
● Look at factors that affect population dynamics
o Size: absolute number of individuals
o Density: number of individuals per unit area
▪ Sample plots
▪ Indicator estimates
o Growth rate: increase in population per unit time
o Age structure: number of individuals in each age group
What can population age structure reveal?
● Age structure provides information population density cannot:
o The histor of a populatio’s survival
o Reproductive success
o How the population relates to environmental factors
o Predicting future population changes
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Document Summary
Some animals migrate to where temperature is better to sustain themselves. Warming trend de-syncs environmental cues: temp increase= cue for flowering, breeding, day length= cue for coat color change in artic animals, plants may bloom before pollinators emerge. Water source depleted before dry season ends: trees are drought stressed, dark beetles have two reproductive cycles. What are the characteristics of populations that would be most resistant to extinction. Answer: yes via climate change: answer: variety and populations with shorter generation times who can adapt, Chapter 19: population ecology evolve, and reproduce more rapidly. A population is a group of individuals of a single species that occupty the same general area. Look at factors that affect population dynamics: size: absolute number of individuals, density: number of individuals per unit area. Indicator estimates: growth rate: increase in population per unit time, age structure: number of individuals in each age group.
