Population Growth
Draw a logistic growth curve and label the three phases of logistic growth.
S curve, Phase 1 (exponential growth), Phase 2 (growth slowing down), Phase 3 (carrying capacity)
If a population has an equal number of births and deaths what is its growth rate?
This population most likely has reached it ___________ __________________.
Growth rate=0
reached carrying capacity
Organisms will fulfill different niches in order to reduce _______.
competition
The study of organisms and their environment is called...
Ecology
In the African Savanna, elephants travel in a heard. What does this distribution type suggest about the resources in the Savana?
The resources are sparse (hard to come by) and there is little competition between the elephants
Draw a simple double-line graph showing the relationship between predator and prey growth rates
Graph should show prey pop going up and predator going down. then predator inc and prey dropping.
A ________ _______ shows multiple overlapping food chains and gives us a better understanding of the transfer of energy in an ecosystem.
Food web
What trophic level has the most energy?
Producers
Bacteria growing in agar on a petri dish are doubling in size every 32 hours. You calculate that the bacteria are growing exponentially. What does this suggest about the abundance of the agar food source for the bacteria?
there is a lot of agar for the bacteria and their population will continue to grow until it runs out.
The addition of 200 more baby otters in an ecosystem has led to increased competition for food sources. what type of limiting factor is this?
Density Dependent (DD)
Create a Food web including 8 total organisms
-must start with a producer
-arrows must point in the correct direction
Humans have microbes in our gut that help digest food. In return, the microbes receive an environment to live in and a food source. What type of relationship is this?
Mutualism
What phase of logistic growth do limiting factors have little to no affect on a population?
Phase 1 since the population is growing exponentially
Identify if each factor is Density Dependent or Density-Independent.
1. Forest fire kills half the tree pop.
2. Spider population is affected by a spreading disease
3. Predator pop increases and prey pop decreases
According to the _____ rule, how much energy travels up to each organism in a food chain?
10%
The third consumer in a food web is called the __________ ___________
Tertiary Consumer
A tornado decreases the carrying capacity of a prairie. What type of limiting factor is the tornado and how does the size of the population impact the severity of the tornado?
Density independent, meaning the size or density of a population has no effect on the severity of the tornado.
A disease spread by a parasite is causing a population of moose in southern Alaska to die. If the disease spreads to the more dense central Alaska population, how would the rate of the disease spreading compare to the southern Alaska population? WHY?
It would be much faster and kill many more moose because the disease is density dependent. Meaning it has a greater effect on more dense populations.
Create a 5 level Trophic Pyramid starting with 45,670 kCal
Each Level: 45,670 kCal, 4,567 kCal, 456.7 kCal, 45.67 kCal, and 4.567 kCal
Make a simple graph of this data
Day 1 2 3
Number of bacteria (thousands) 3 4 7
Days= IV x axis
Number of bacteria= DV Y axis