Population Growth
Logistic growth
What is a limiting factor?
Something that keeps populations from having exponential growth
Density Dependent factors tend to be _________ or between living things.
biotic
Density Independent factors tend to be _________ or random uncontrolled things, like weather.
abiotic
Why is biodiversity important?
It allows ecosystems to thrive and be more resilient to disasters.
Why do organisms typically have logistic growth?
Answers may vary:
- Populations are limited due to resource availability and other Limiting factors (density-dependent and independent factors).
What is a carrying capacity?
The amount of a species that an ecosystem can support!
Density dependent factors tend to affect populations based on _______.
density - size
Density independent factors tend not to affect populations based on _______.
Identify the richness of the community below:
Raccoon: 54
Mouse: 150
Rabbit: 78
Squirrel: 94
4
What is immigration and what does immigration do what to a population?
The movement of individuals into a population.
These both increase a population size.
What is the carrying capacity of the following graph?
*hint* Ms. Dion needs to put up the graph from a google doc!
40
Ms. Dion would accept anywhere from 38-42
Identify the density dependent limiting factor:
In a dense forest ecosystem, a population of deer thrives during the spring and summer months when vegetation is abundant. However, as winter approaches, the availability of food decreases significantly. With limited forage, the deer struggle to find enough sustenance to survive the harsh winter conditions.
Food availability
Identify the density independent factor in the scenario:
A population of amphibians inhabits a freshwater wetland ecosystem that experiences seasonal fluctuations in temperature and precipitation. However, due to climate change, the region undergoes prolonged periods of drought followed by intense rainfall events. These extreme weather patterns disrupt the breeding behavior of the amphibians, affecting their reproductive success and survival rates.
Climate change
Calculate the species abundance of the following:
Raccoon: 54
Mouse: 150
Rabbit: 78
Squirrel: 94
Raccoon: 14%
Mouse: 40%
Rabbit: 21%
Squirrel: 25%
What is emigration and what does it do to a population?
The movement of individuals out of a population. It causes a population to shrink.
What is the carrying capacity of the following graph?
*Pst* Ms. Dion put up the graph from google slide
22
Ms. Dion would accept 21, 22, or 23
Identify the density dependent limiting factor:
A population of lions inhabits a savanna ecosystem where they compete for territory and resources. As the lion population increases, competition among individuals intensifies, leading to conflicts over access to food and mating opportunities. Dominant individuals maintain control over prime territories, while subordinate individuals are forced into marginal habitats with limited resources.
Competition
Identify the density independent factor:
A population of small mammals, such as mice and voles, resides in a riverine ecosystem characterized by periodic flooding. During the rainy season, heavy precipitation causes the river to overflow its banks, resulting in widespread flooding of the surrounding floodplain. The rising waters inundate the burrows and nesting sites of the small mammals, leading to high mortality rates among individuals. The floods disrupt breeding cycles and wash away food supplies, severely impacting the population size of the small mammals.
Flooding
Based on the scenario below, which community is most resilient and why?
Community A has 5 species and is slightly overpopulated by the wheat crop, leaving little room for other native plants to grow.
Community B has 4 species with an even amount of all species. This community houses many spaces for the native plants to thrive.
B: it has a greater relative abundance.
What kind of growth do humans have and why?
Exponential. answers may vary.
Identify the limiting factor below:
A population of rabbits inhabits a grassland ecosystem where they are the primary prey species for a population of foxes. Initially, the rabbit population experiences rapid growth due to favorable environmental conditions and abundant food resources. However, as the rabbit population increases, so does the population of foxes. Soon the rabbit population decreases drastically.
Predation
Identify the limiting factor affecting the hawk:
A colony of mice lives in a field ecosystem, where they reproduce and raise their young. Over time, a fungal disease begins to spread among the mouse population, causing significant mortality rates. The hawks that tend to prey on these mice have had to change their diet to survive.
Food availability
Identify the density independent factor:
A population of deer inhabits a woodland ecosystem dominated by dense vegetation and tall trees. Following a prolonged period of drought and high temperatures, a lightning strike ignites a wildfire that quickly spreads throughout the forest. The intense blaze consumes large swathes of the deer's habitat, destroying food sources and shelter. Many individuals succumb to the flames or suffer from smoke inhalation, resulting in significant mortality within the deer population.
Wildfire
What is the most biodiverse ecosystem on Earth?
The Amazon Rainforest