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Populations: Growth and Limiting Factors
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Populations A group of organisms of the same
species living together & can interbreed Grow: Exponentially ~ numbers increase by a certain factor Ex: 1 min = 2 bacteria, 2 min = 4 bacteria, 3 min = 8 bacteria Logistically ~ start w/ low number, then reaches a maximum based on carrying capacity Ex: 24 rabbits continue to reproduce until resources become low, then reproduction slows Carrying capacity ~largest population an environment can any time (Density independent & dependent)
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Factors affecting population
Biotic ~ living & factors related to the activities of living things. Ex: disease, food, parasites, starvation, predators. Density dependent Abiotic ~ nonliving factors. Ex: weather, water, temperature, climate. Density independent
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Population interactions
Pops interact to survive & maintain equilibrium Symbiosis ~ a close association of two species Predator/Prey interaction Predation ~ killing an organism for food Predator ~ kills, prey ~ is /gets killed Parasite/Host interaction Parasitism ~ one organism feeds on another organism Parasite ~ feeds on organism, host ~ gets fed off of **** COEVOLUTION****
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POPULATION INTERACTIONS
Mutualism Relationship where both species benefit Commensalism Relationship where one species benefits & the other is neither harmed nor helped
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Populations Population Density: # of individuals in a specific area at a given time Biodiversity: having a variety of organisms in a specific area
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Population Growth Population Size is affected by # of births
# of deaths migration
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Exponential Growth (J Curve)
the population continues to increase because there are unlimited resources
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Logistic Growth (S curve)
Population growth slows as it reaches carrying capacity Carrying capacity = the # of individuals that the environment can support
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A look into Communities
Every organism has a role or niche Fundamental ~ conditions that organism could survive Realized ~ conditions actually surviving Similar niches result in competitive exclusion One species eliminates another thru competition **Some species will divide resources**
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A look into communities
It is important to remember: Ecosystems thrive due to much biodiversity All organism work with other organisms to maintain equilibrium. All organisms play a role that helps to maintain the ecosystem. If one part of the ecosystem changes, so does the entire ecosystem!
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