Question

population changes and population momentum

1. identify the four factors used to determine population growth. indicate which factors add organisms to a population and which factors remove organisms from a population. identify the equation used to calculate population growth.

r-selected and k-selected species

1. identify two characteristics of an r - selected species.
2. identify two characteristics of a k - selected species.
3. identify the following as r - selected species or k - selected species. explain why each is endangered or extinct.

species r - selected or k - selected reason for endangered or extinct status
whooping crane (endangered)
orangutan (endangered)
dodo (extinct)
california condor (endangered)

Explanation:

• Question 3: The four factors for population growth are birth rate (adds organisms), death rate (removes organisms), immigration (adds organisms), and emigration (removes organisms). The formula for population growth is \( Population\ Growth=(Births + Immigration)-(Deaths+Emigration) \).
• Question 4: Characteristics of r - selected species: short lifespan, large number of offspring.
• Question 5: Characteristics of K - selected species: long lifespan, few offspring with high parental care.
• Question 6:
• Whooping Crane: K - selected. Endangered because of low reproductive rate (few offspring, long - lived) and habitat loss.
• Orangutan: K - selected. Endangered due to low reproductive rate (long gestation, few offspring) and deforestation (habitat loss).
• Dodo: K - selected. Extinct because of low reproductive rate (slow to mature, few offspring) and human - related factors (hunting, introduction of invasive species).
• California Condor: K - selected. Endangered due to low reproductive rate (one or two eggs per year) and historical hunting, lead poisoning.

Answer:

• Question 3: Four factors: birth rate (adds), death rate (removes), immigration (adds), emigration (removes). Formula: \( Population\ Growth=(Births + Immigration)-(Deaths+Emigration) \)
• Question 4: Short lifespan, large number of offspring.
• Question 5: Long lifespan, few offspring with high parental care.
• Question 6:
• Whooping Crane: K - selected. Endangered: low reproductive rate, habitat loss.
• Orangutan: K - selected. Endangered: low reproductive rate, deforestation.
• Dodo: K - selected. Extinct: low reproductive rate, human - related factors.
• California Condor: K - selected. Endangered: low reproductive rate, historical hunting, lead poisoning.