POPULATIONS LAST UNIT!!!! WAHOOOO!!!. OBJECTIVES: -Describe the factors that affect the carrying...
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Transcript of POPULATIONS LAST UNIT!!!! WAHOOOO!!!. OBJECTIVES: -Describe the factors that affect the carrying...
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POPULATIONSL A S T U N I T ! ! ! ! WA H O O O O ! ! !
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OBJECTIVES:
- Describe the factors that affect the carrying capacity of the environment.
- Explain how change in population density is affected by emigration, immigration, birth rate and death rate, and relate these factors to the exponential growth of human populations.
- Explain how technological advances have affected the size and growth rate of human populations throughout history.
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GRAPH #1 EXPONENTIAL GROWTH
• Exponential is growth that would take place under ideal conditions with unlimited resources.
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GRAPH #2: LOGISTICAL GROWTH
• Logistical is growth that is eventually limited to a number (carrying capacity) that can be supported by environmental resources.
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• Carrying Capacity:
The number of individuals in a population that an environment can support.
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Logistical Growth Curve
Exponential Growth Curve
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DENSITY DEPENDENT VS. DENSITY INDEPENDENT
• Logistical growth is affected by DENSITY DEPENDENT factors. These are things that affect the population as it gets more and more dense…
For example:Running out of foodRunning out of places to liveOther limited resourcesSpread of disease
• DENSITY INDEPENDENT factors = things that affect the population no matter if it is large or small. For example, a hurricane.
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WHAT TYPE OF POPULATION GROWTH HAS THE HUMAN POPULATION
EXPERIENCED?
How did we get so big so fast???
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FACTORS THAT AFFECT GROWTH
1. Birth Rate: the amount of births for a given time period
2. Death Rate: the amount of deaths for a given time period
3. Immigration: movement of organisms INTO an area occupied by an existing population
4. Emigration: movement of organisms OUT of an area where population is located
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AGE STRUCTURE DIAGRAMS
A graph that shows a population’s growth based on AGE and GENDER.
Age Groups:1. Pre-Reproductive= 0-4 through
15-192. Reproductive= 20-24 through 40-
443. Post Reproductive= 45-49
through 80+
There are 3 types of growth patterns:1. Rapid Positive Growth2. Slow Positive Growth 3. Negative Growth
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RAPID POSITIVE GROWTH
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SLOW POSITIVE GROWTH
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NEGATIVE GROWTH
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YEAST POPULATION LABS
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After reviewing her data, the student decides to perform an additional trail at 35°C. She observes that the balloon inflates faster than during the trail in which the 30°C water was used. This additional trial supports which of the following hypotheses?
a) The optimum temperature for yeast fermentation is less than 35°Cb) Warmer temperatures are more favorable for yeast fermentationc) Yeast require less sugar when maintained at lower temperaturesd) The time required for fermentation increases with increasing temperature
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The yeast were placed on a nutrient dish and allowed to grow. On which day was additional nutrient most likely added to the yeast culture?
a) 3b) 4c) 6d) 7