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Understanding Population Ecology and Habitat Dynamics

Explore the intricate relationships between organisms and their habitats, from fundamental niches to carrying capacity and limiting factors. Learn about exponential and logistical growth, survivorship curves, and factors impacting population size.

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Understanding Population Ecology and Habitat Dynamics

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  1. Population Ecology

  2. HABITAT = The area where an organism lives “address” NICHE = place it lives PLUS the biotic and abiotic interactions it has in that place “occupation”

  3. Realized vs. Fundamental niche • Fundamental – where a species CAN possibly live • Disregard predation & limiting factors • Realized –where the species actually DOES live • because predators, limiting factors, etc. have forced it to leave parts of the fundamental niche

  4. CARRYING CAPACITY (K) • Maximum population size environment can support http://www.algebralab.org/img/cb07ae0c-5106-416c-8407-38da526923c6.gif

  5. Limiting Factors element in short supply or cycles slowly LIMITS the growth of the population http://www.wspa-international.org/exhibition/gallery/large_DeadKenyan%20droughtSPANA.jpg

  6. Population size is affected by: Levels of competition Predatory defense mechanisms Resistance to disease and parasites Ability to migrate • Environmental conditions • Birth rate • Realized vs. Fundamental niche • Food supply • Habitat

  7. Exponential Growth • Occurs when populations are introduced into new niche • May occur when numbers have been reduced due to a catastrophic event and population is rebounding • Differences in birth and death rate are high

  8. Logistical Growth Slide by Kim Foglia • Rapid reproduction phase • Then slower growth rate as population increases

  9. Exponential vs. Logistical

  10. Survivorship Curves

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