Question

which of the following limiting factors would be directly affected by a drought?
a. birth/death rate
b. immigration
c. available niche
d. resource supply

please select the best answer from the choices provided

a
b
c
d

Explanation:

🆕 New Concept Discovered: limiting factors in ecosystems
How environmental constraints control population growth

Step 1: Define a drought in ecological terms

A drought is a prolonged period of abnormally low rainfall, leading to a severe shortage of water. In an ecosystem, water is a fundamental abiotic (non-living) resource that plants and animals need to survive, grow, and reproduce.

Step 2: Analyze the options

• a. birth/death rate: While a drought will eventually change birth and death rates, this is an indirect biological consequence of losing a vital resource, rather than the factor directly altered by the weather event itself.
• b. immigration: Immigration refers to organisms moving into an area. A drought would likely decrease immigration or increase emigration, but this is a behavioral response to the changing environment, not the direct target of the drought.
• c. available niche: A niche is the functional role and position of a species in its environment. While the conditions within the niche change, the physical availability of the ecological role itself is not the primary direct physical factor being depleted.
• d. resource supply: Water is a primary environmental resource. A drought directly reduces the physical supply of water available to the ecosystem, which in turn limits the survival of the organisms relying on it.

Step 3: Select the best option

Because a drought is physically characterized by a lack of water (an essential resource), it directly reduces the resource supply of the ecosystem.

Answer:

D